NEET Chemistry The s-Block Elements / s-ब्लॉक के तत्व Sample Paper

done Self Evaluation Test - The s-Blcok Elements Total Questions - 60    [Download]

• question_answer1)
  In the case of alkali metals, the covalent character decreases in the order:
  A)
  \[MF>MCl>MBr>MI\]
  done clear
  B)
  \[MF>MCl>MI>MBr\]
  done clear
  C)
  \[MI>MBr>MCl>MF\]
  done clear
  D)
  \[MCl>MI>MBr>MF\]
  done clear
  View Answer play_arrow

• question_answer2)
  The mobility of metal ions in aqueous medium \[(L{{i}^{+}},N{{a}^{+}},{{K}^{+}},R{{b}^{+}})\] in the electric field, follows the order
  A)
  \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]
  done clear
  B)
  \[R{{b}^{+}}>N{{a}^{+}}={{K}^{+}}>L{{i}^{+}}\]
  done clear
  C)
  \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}\]
  done clear
  D)
  \[N{{a}^{+}}={{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}\]    
  done clear
  View Answer play_arrow

• question_answer3)
    The main oxides formed on combustion of \[Li,\text{ }Na\] and K in excess of air are, respectively:
  A)
  \[L{{i}_{2}}{{O}_{2}},N{{a}_{2}}{{O}_{2}}\] and \[K{{O}_{2}}\]
  done clear
  B)
  \[L{{i}_{2}}O,N{{a}_{2}}{{O}_{2}}\]and \[K{{O}_{2}}\]
  done clear
  C)
  \[L{{i}_{2}}O,N{{a}_{2}}O\] and \[K{{O}_{2}}\]
  done clear
  D)
  \[Li{{O}_{2}},N{{a}_{2}}{{O}_{2}}\]and \[{{K}_{2}}O\]
  done clear
  View Answer play_arrow

• question_answer4)
  Which of the following oxides of potassium is not known?
  A)
  \[{{K}_{2}}O\]             
  done clear
  B)
  \[{{K}_{2}}{{O}_{4}}\]
  done clear
  C)
  \[K{{O}_{3}}\]             
  done clear
  D)
  \[{{K}_{2}}{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer5)
  Nitrogen dioxide cannot be prepared by heating
  A)
  \[KN{{O}_{3}}\]       
  done clear
  B)
  \[Pb{{(N{{O}_{3}})}_{2}}\]
  done clear
  C)
  \[Cu{{(N{{O}_{3}})}_{2}}\]                
  done clear
  D)
  \[AgN{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer6)
  Incorrect statement is:
  A)
  \[NaHC{{O}_{3}}\] and \[KHC{{O}_{3}}\] have same crystal structure
  done clear
  B)
  On heating \[LiN{{O}_{3}}\] decomposes into \[L{{i}_{2}}O\] and \[N{{O}_{2}}\]
  done clear
  C)
  Among alkali metals, \[Li\]metal impart red colour to flame
  done clear
  D)
  \[L{{i}_{2}}S{{O}_{4}}\] does not form alum
  done clear
  View Answer play_arrow

• question_answer7)
  Which is not correctly matched

  (i) Basic strength \[C{{s}_{2}}O<R{{b}_{2}}O<{{K}_{2}}O<N{{a}_{2}}O<L{{i}_{2}}O\] of oxides.

  (ii) Stability of \[N{{a}_{2}}{{O}_{2}}<{{K}_{2}}{{O}_{2}}<R{{b}_{2}}{{O}_{2}}<C{{s}_{2}}{{O}_{2}}\] peroxides.

  (iii) Stability of \[LiHC{{O}_{3}}<NaHC{{O}_{3}}<KHC{{O}_{3}}\] \[<RbHC{{O}_{3}}<CsHC{{O}_{3}}.\]

  (iv) Melting point \[NaF<NaCl<NaBr<NaI\]

   
  A)
  (i) and (iv)      
  done clear
  B)
  (i) and (iii)
  done clear
  C)
  (i) and (ii)          
  done clear
  D)
  (ii) and (iii)
  done clear
  View Answer play_arrow

• question_answer8)
  The solubility order for alkali metal fluoride in water is:
  A)
  \[LiF<RbF<KF<NaF\]
  done clear
  B)
  \[RbF<KF<NaF<LiF\]
  done clear
  C)
  \[LiF>NaF>KF>RbF\]
  done clear
  D)
  \[LiF<NaF<KF<RbF\]
  done clear
  View Answer play_arrow

• question_answer9)
  Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point?
  A)
  \[NaCl\]
  done clear
  B)
  \[KCl\]  
  done clear
  C)
  \[LiCl\]             
  done clear
  D)
  \[RbCl\]
  done clear
  View Answer play_arrow

• question_answer10)
  In crystals which one of the following ionic compounds would you expect maximum distance between centres of cations and anions?
  A)
  \[LiF\]  
  done clear
  B)
  \[CsF\] 
  done clear
  C)
  \[CsI\] 
  done clear
  D)
  \[LiI\]
  done clear
  View Answer play_arrow

• question_answer11)
  Which of the following statements about\[N{{a}_{2}}{{O}_{2}}\], is not correct?           
  A)
  It is diamagnetic in nature
  done clear
  B)
  It is derivative of \[{{H}_{2}}{{O}_{2}}\]
  done clear
  C)
  \[N{{a}_{2}}{{O}_{2}}\] oxidises \[C{{r}^{3+}}\] to \[CrO_{4}^{2-}\]in  acid medium.
  done clear
  D)
  It is the super oxide of sodium
  done clear
  View Answer play_arrow

• question_answer12)
  The correct order of thermal stability of hydroxides is:
  A)
  \[Ba{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Mg{{(OH)}_{2}}\]
  done clear
  B)
  \[Mg{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Ba{{(OH)}_{2}}\]
  done clear
  C)
  \[Mg{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ba{{(OH)}_{2}}\]
  done clear
  D)
  \[Ba{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Mg{{(OH)}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer13)
  The reducing power of a metal depends on various factors. Suggest the factor which makes \[Li\]metal the strongest reducing agent in aqueous solution:
  A)
  Sublimation enthalpy
  done clear
  B)
  Ionisation enthalpy
  done clear
  C)
  Hydration enthalpy
  done clear
  D)
  Electron-gain enthalpy
  done clear
  View Answer play_arrow

• question_answer14)
  Select the  correct statements :

  I. \[C{{s}^{+}}\] is more highly hydrated than the other

  alkali metal ions

  II. Among the alkali metals \[Li,\text{ }Na,\text{ }K\]and \[Rb,\]lithium has the highest melting point

  III. Among the alkali metals, only lithium forms a stable nitride by direct combination with nitrogen

  A)
  I, II and III       
  done clear
  B)
  I and II
  done clear
  C)
  I and III            
  done clear
  D)
  II and III
  done clear
  View Answer play_arrow

• question_answer15)
  In the following sequence of reaction, identify the compounds (A), (B) (C) and (D): \[\underset{Solution}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,\xrightarrow{S{{O}_{2}}}(A)\xrightarrow{N{{a}_{2}}C{{O}_{3}}}\] \[(B)\xrightarrow[Heat]{S}(C)\xrightarrow{AgN{{O}_{3}}}(D)\]
  A)
  \[N{{a}_{2}}S{{O}_{3}},NaHS{{O}_{3}},N{{a}_{2}}S,A{{g}_{2}}S\]
  done clear
  B)
  \[NaHS{{O}_{3}},N{{a}_{2}}S{{O}_{3}},N{{a}_{2}}{{S}_{2}}{{O}_{3}},A{{g}_{2}}S\]
  done clear
  C)
  \[NaHS{{O}_{3}},N{{a}_{2}}S{{O}_{4}},N{{a}_{2}}S,A{{g}_{2}}O\]
  done clear
  D)
  \[N{{a}_{2}}S{{O}_{3}},N{{a}_{2}}S{{O}_{4}},N{{a}_{2}}{{S}_{2}}{{O}_{3}},Ag\]
  done clear
  View Answer play_arrow

• question_answer16)
  Which of the following does not illustrate the anomalous properties of lithium?
  A)
  The melting point and boiling point of\[~Li\] are comparatively high
  done clear
  B)
  \[~Li\] is much softer than the other group I metals
  done clear
  C)
  \[~Li\] forms a nitride \[~L{{i}_{3}}N\] unlike group I metals
  done clear
  D)
  The ion of \[~Li\] and its compounds are more heavily hydrated than those of the rest of the group
  done clear
  View Answer play_arrow

• question_answer17)
  The order solubility in water of alkaline earth metal sulphates down the group is\[Be>Mg>Ca>Sr>Ba\]. This is due to  increases in
  A)
  ionization energy            
  done clear
  B)
  melting point
  done clear
  C)
  coordination number      
  done clear
  D)
  All of these
  done clear
  View Answer play_arrow

• question_answer18)
  A chloride dissolves appreciably in cold water. When placed on a Pt wire in bunsen flame, no distinctive colour is noted. Which cation could be present?
  A)
  \[B{{e}^{2+}}\]         
  done clear
  B)
  \[B{{a}^{2+}}\]
  done clear
  C)
  \[P{{b}^{2+}}\]                     
  done clear
  D)
  \[C{{a}^{2+}}\]
  done clear
  View Answer play_arrow

• question_answer19)
  An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions :

  (a) It gives a white turbidity with dilute \[HCl\] solution

  (b) It decolourises a solution of iodine in potassium iodide

  (c)  It gives a white precipitate with silver nitrate solution which turns black on standing.

  Identify the compound (X)
  A)
  \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\]       
  done clear
  B)
  \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O\]
  done clear
  C)
  \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\]       
  done clear
  D)
  None of these
  done clear
  View Answer play_arrow

• question_answer20)
  A metal M readily forms its sulphate \[MS{{O}_{4}}\]which is water-soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hyroxide \[M{{(OH)}_{2}}\], which is soluble in \[NaOH\]solution. Then M is
  A)
  \[Mg\]  
  done clear
  B)
  \[Ba\]  
  done clear
  C)
  \[Ca\] 
  done clear
  D)
  \[Be\]
  done clear
  View Answer play_arrow

• question_answer21)
  Melting point of calcium halides decreases in the  order
  A)
  \[Ca{{F}_{2}}>CaC{{l}_{2}}>CaB{{r}_{2}}>Ca{{I}_{2}}\]
  done clear
  B)
  \[Ca{{I}_{2}}>CaB{{r}_{2}}>CaC{{l}_{2}}>Ca{{F}_{2}}\]
  done clear
  C)
  \[CaB{{r}_{2}}>Ca{{I}_{2}}>Ca{{F}_{2}}>CaC{{l}_{2}}\]
  done clear
  D)
  \[CaC{{l}_{2}}>CaB{{r}_{2}}>Ca{{I}_{2}}>Ca{{F}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer22)
  Which of the following is not correct?
  A)
  \[2L{{i}_{2}}O\xrightarrow[673K]{heat}L{{i}_{2}}{{O}_{2}}+2Li\]
  done clear
  B)
  \[2{{K}_{2}}O\xrightarrow[673K]{heat}{{K}_{2}}{{O}_{2}}+2K\]
  done clear
  C)
  \[2N{{a}_{2}}O\xrightarrow[673K]{heat}N{{a}_{2}}{{O}_{2}}+2Na\]
  done clear
  D)
  \[2Rb{{O}_{2}}\xrightarrow[673K]{heat}R{{b}_{2}}{{O}_{2}}+2Rb\]
  done clear
  View Answer play_arrow

• question_answer23)
  The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?
  A)
  \[CsH>RbH>KH>NaH>LiH\]
  done clear
  B)
  \[KH>NaH>LiH>CsH>RbH\]
  done clear
  C)
  \[NaH>LiH>KH>RbH>CsH\]
  done clear
  D)
  \[LiH>NaH>KH>RbH>CsH\]
  done clear
  View Answer play_arrow

• question_answer24)
  Which of the following is not correct about the solution when moderate amount of sodium metal is dissolved in liquid ammonia at low temperature?
  A)
  \[N{{a}^{+}}\] ions are produced in solution
  done clear
  B)
  We get a blue coloured solution
  done clear
  C)
  the solution acts as a good conductor of electricity
  done clear
  D)
  Liquid ammonia remains diamagnetic
  done clear
  View Answer play_arrow

• question_answer25)
  The order of solubility of lithium halides in nonpolar solvents follows the order
  A)
  \[LiI>LiBr>LiCl>LiF\]
  done clear
  B)
  \[LiF>LiI>LiBr>LiCl\]
  done clear
  C)
  \[LiCl>LiF>LiI>LiBr\]
  done clear
  D)
  \[LiBr>LiCl>LiF>LiI\]
  done clear
  View Answer play_arrow

• question_answer26)
  Which of the following is most stable?
  A)
  \[N{{a}_{3}}N\]     
  done clear
  B)
  \[L{{i}_{3}}N\]
  done clear
  C)
  \[{{K}_{3}}N\]        
  done clear
  D)
  \[R{{b}_{3}}N\]
  done clear
  View Answer play_arrow

• question_answer27)
  \[ZnC{{l}_{2}}+NaHC{{O}_{3}}\xrightarrow{Heat}(A)\xrightarrow{Heat}\] \[(B)+(C){{H}_{2}}O(B)+NaOH\to (D)\] Identify the compound (D) present in the solution.              
  A)
  \[ZnC{{O}_{3}}\]        
  done clear
  B)
  \[Zn{{(OH)}_{2}}\]
  done clear
  C)
  \[ZnO\]             
  done clear
  D)
  \[N{{a}_{2}}Zn{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer28)
  Which of the following has correct increasing basic strength?
  A)
  \[MgO<BeO<CaO<BaO\]
  done clear
  B)
  \[BeO<MgO<CaO<BaO\]
  done clear
  C)
  \[BaO<CaO<MgO<BeO\]
  done clear
  D)
  \[CaO<BaO<BeO<MgO\]
  done clear
  View Answer play_arrow

• question_answer29)
  Which of the following statement is false?
  A)
  Strontium decomposes water readily than beryllium.
  done clear
  B)
  Barium carbonate melts at a higher temperature than calcium carbonate.
  done clear
  C)
  Barium hydroxide is more soluble in water than magnesium hydroxide.
  done clear
  D)
  Beryllium hydroxide is more basic than barium hydroxide.
  done clear
  View Answer play_arrow

• question_answer30)
  Which of the following is the best method for preparation of \[Be{{F}_{2}}\]?
  A)
  Reaction of \[Be\] with \[{{F}_{2}}\]
  done clear
  B)
  Thermal decomposition of \[{{(N{{H}_{4}})}_{2}}Be{{F}_{4}}\]
  done clear
  C)
  Reaction of \[Be\]with \[HF\]
  done clear
  D)
  All of the above are equally effective
  done clear
  View Answer play_arrow

• question_answer31)
  Aqueous solution of a group 2 element is precipitated by adding \[N{{a}_{2}}C{{O}_{3}},\] then this precipitate is tested on flame, no light in visible region is observed , this element can be
  A)
  \[Ba\]   
  done clear
  B)
  \[Mg\]  
  done clear
  C)
  \[Ca\]  
  done clear
  D)
  \[Sr\]
  done clear
  View Answer play_arrow

• question_answer32)
  Which or me following are found in biological fluids \[N{{a}^{+}},M{{g}^{2+}},C{{a}^{2+}},{{K}^{+}},S{{r}^{2+}},L{{i}^{+}}\] and \[B{{a}^{2+}}\]?
  A)
  \[M{{g}^{2+}},C{{a}^{2+}},\] and \[S{{r}^{2+}}\]
  done clear
  B)
  \[N{{a}^{2+}}\] and \[{{K}^{+}}\]
  done clear
  C)
  \[N{{a}^{+}},{{K}^{+}},M{{g}^{2+}}\]and \[C{{a}^{2+}}\]
  done clear
  D)
  \[S{{r}^{+}},Li\]and \[B{{a}^{2+}}\]
  done clear
  View Answer play_arrow

• question_answer33)
  Metallic magnesium is prepared by
  A)
  reduction of \[MgO\]by coke.
  done clear
  B)
  electrolysis of aqueous solution of \[Mg{{(N{{O}_{3}})}_{2}}.\]
  done clear
  C)
  displacement of \[Mg\]by iron from \[MgS{{O}_{4}}\] solution.
  done clear
  D)
  electrolysis of molten \[MgC{{l}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer34)
  A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. When\[C{{O}_{2}}\]. is bubbled through an aqueous solution of (A), the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
  A)
  \[Ca{{(HC{{O}_{3}})}_{2}}\]
  done clear
  B)
  \[CaO\]
  done clear
  C)
  \[Ca{{(OH)}_{2}}\]     
  done clear
  D)
  \[CaC{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer35)
  \[Be{{F}_{2}}\] is soluble in water whereas fluorides of other alkaline earth metals are insoluble because of
  A)
  ionic nature of \[Be{{F}_{2}}\].
  done clear
  B)
  covalent nature of \[Be{{F}_{2}}\].
  done clear
  C)
  greater hydration energy of \[B{{e}^{2+}}\] ion as compared to its lattice energy.
  done clear
  D)
  none of these.
  done clear
  View Answer play_arrow

• question_answer36)
  Which category of salts of alkaline earth metals is not found in solid sate, but found in solution state?
  A)
  Carbonates      
  done clear
  B)
  Bicarbonates  
  done clear
  C)
  Hydroxides  
  done clear
  D)
  Sulphates   
  done clear
  View Answer play_arrow

• question_answer37)
  Sodium carbonate solution in water is alkaline due to     
  A)
  hydrolysis of \[N{{a}^{+}}\]              
  done clear
  B)
  hydrolysis of \[CO_{3}^{2-}\]
  done clear
  C)
  hydrolysis of both \[N{{a}^{+}}\] and \[CO_{3}^{2-}\] ions            
  done clear
  D)
  None of these  
  done clear
  View Answer play_arrow

• question_answer38)
  When a crystal of caustic soda is exposed to air,  a liquid layer is deposited because :        
  A)
  Crystal loses water         
  done clear
  B)
  Crystal absorbs moisture and \[C{{O}_{2}}\]
  done clear
  C)
  Crystal melts
  done clear
  D)
  Crystal sublimes  
  done clear
  View Answer play_arrow

• question_answer39)
  Which of me following statements is correct for\[CsBr\]?
  A)
  It is a covalent compound.
  done clear
  B)
  It contains \[C{{s}^{3+}}\] and \[B{{r}^{-}}\] ions.
  done clear
  C)
  It contains \[C{{s}^{+}}\] and \[B{{r}_{3}}^{-}\] ions
  done clear
  D)
  It contains \[C{{s}^{+}},\] and \[B{{r}^{-}}\] and lattice \[B{{r}_{2}}\] molecule.
  done clear
  View Answer play_arrow

• question_answer40)
  The pair of compounds which cannot exits together in solution is      
  A)
  \[NaHC{{O}_{3}}\]and \[NaOH\]
  done clear
  B)
  \[N{{a}_{2}}C{{O}_{3}}\]and \[NaHC{{O}_{3}}\]
  done clear
  C)
  \[N{{a}_{2}}C{{O}_{3}}\]and\[NaOH\]       
  done clear
  D)
  \[NaHC{{O}_{3}}\]and \[NaCl\]
  done clear
  View Answer play_arrow

• question_answer41)
  \[N{{a}_{2}}S{{O}_{3}}\] and \[NaHC{{O}_{3}}\] may be distinguished by treating their aqueous solution with :
  A)
  \[MgO\]    
  done clear
  B)
  \[MgS{{O}_{4}}\]
  done clear
  C)
  litmus solution,
  done clear
  D)
  dil.acid
  done clear
  View Answer play_arrow

• question_answer42)
  Substance which absorbs \[C{{O}_{2}},\] and violently reacts with \[{{H}_{2}}O\] with sound is :
  A)
  \[{{H}_{2}}S{{O}_{4}}\]       
  done clear
  B)
  \[CaC{{O}_{3}}\]
  done clear
  C)
  \[ZnO\]     
  done clear
  D)
  \[CaO\]
  done clear
  View Answer play_arrow

• question_answer43)
  When sulphur is heated with \[NaOH\,(aq)\]. The compounds formed are
  A)
  \[N{{a}_{2}}S+{{H}_{2}}O\]
  done clear
  B)
  \[N{{a}_{2}}S{{O}_{3}}+{{H}_{2}}O\]
  done clear
  C)
  \[N{{a}_{2}}S+N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\]
  done clear
  D)
  \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\]
  done clear
  View Answer play_arrow

• question_answer44)
  The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid from which hydrogen is released on treatment with water. The metal is:
  A)
  \[Ca\]   
  done clear
  B)
  \[Al\]   
  done clear
  C)
  \[Zn\]  
  done clear
  D)
  \[Cu\]
  done clear
  View Answer play_arrow

• question_answer45)
  Acidified solution of sodium thiosulphate is unstable because in thiosulphate
  A)
  the sulphur atoms are at unstable oxidation  state of \[+2\]
  done clear
  B)
  the two sulphur atoms are at different oxidation states of \[+6\] and \[-2\]
  done clear
  C)
  the \[S-S\] bond are unstable bonds.    
  done clear
  D)
  sulphur is in zero oxidation state.
  done clear
  View Answer play_arrow

• question_answer46)
  Two metals (A) and (B) belong to the same group of the periodic table. Metal (A) forms an insoluble oxide but a soluble sulphate, metal (B) forms a soluble oxide but an insoluble sulphate. Both metals (A) and (B) form hydroxides which are soluble m alkalis, (A) and (B) are
  A)
  \[Ba\] and \[Mg\]
  done clear
  B)
  \[Na\] and \[K\]
  done clear
  C)
  \[Mg\] and \[Ba\]
  done clear
  D)
  \[K\] and \[Rb\]
  done clear
  View Answer play_arrow

• question_answer47)
  Among the given statements, the incorrect one is
  A)
  \[Be\] differs much from other alkali metals than \[Li\] does from other alkali metals.
  done clear
  B)
  \[Be\] generally forms covalent compounds
  done clear
  C)
  \[Be\] forms a very strong complex \[{{[Be{{({{H}_{2}}O)}_{4}}]}^{2+}}\].
  done clear
  D)
  \[Be\] usually has more than four water of crystallisation associated with it.
  done clear
  View Answer play_arrow

• question_answer48)
  Calcium imide on hydrolysis gives gas (B) which on oxidation by bleaching powder gives gas (C Gas (C) on reaction with magnesium give compound (D) which on hydrolysis gives agar gas (B). Identify (B), (C) and (D).
  A)
  \[N{{H}_{3}},{{N}_{2}},M{{g}_{3}}{{N}_{2}}\]
  done clear
  B)
  \[{{N}_{2}},N{{H}_{3}},MgNH\]
  done clear
  C)
  \[{{N}_{2}},{{N}_{2}}{{O}_{5}},Mg{{(N{{O}_{3}})}_{2}}\]
  done clear
  D)
  \[N{{H}_{3}},N{{O}_{2}},Mg{{(N{{O}_{2}})}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer49)
  Which one is the correct statement with reference to solubility of \[MgS{{O}_{4}}\] in water?
  A)
  \[S{{O}_{4}}^{2-}\] ion mainly contributes towards hydration energy.
  done clear
  B)
  Sizes of \[M{{g}^{2+}}\] and \[S{{O}_{4}}^{2-}\] are similar.
  done clear
  C)
  Hydration energy of \[MgS{{O}_{4}}\] is higher in comparison to its lattice energy.   
  done clear
  D)
  Ionic potential (charge/radius ratio) of \[M{{g}^{2+}}\]is very low.      
  done clear
  View Answer play_arrow

• question_answer50)
  A solid compound 'X' on heating gives \[C{{O}_{2}}\]gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO,., through 'Y' water, a clear solution 'Z', is obtained. On boil. 'Z', compound "X' is reformed. The compound 'X' is
  A)
  \[Ca{{(HC{{O}_{3}})}_{2}}\]              
  done clear
  B)
  \[CaC{{O}_{3}}\]
  done clear
  C)
  \[N{{a}_{2}}C{{O}_{3}}\]      
  done clear
  D)
  \[{{K}_{2}}C{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer51)
  Amongst the following hydroxides, the one which has the lowest value of K is :
  A)
  \[Ca{{(OH)}_{2}}\]       
  done clear
  B)
  \[Mg{{(OH)}_{2}}\]
  done clear
  C)
  \[Be{{(OH)}_{2}}\]       
  done clear
  D)
   \[Ba{{(OH)}_{2}}\]
  done clear
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• question_answer52)
  For which one of the following minerals. The composition given is incorrect?
  A)
  Soda ash - \[(N{{a}_{2}}C{{O}_{3}})\]
  done clear
  B)
  Camallite - \[(KCl,MgC{{l}_{2}},6{{H}_{2}}O)\]
  done clear
  C)
  Borax - \[(N{{a}_{2}}{{B}_{4}}{{O}_{7}},7{{H}_{2}}O)\]
  done clear
  D)
  Glauber's salt - \[(N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O)\]
  done clear
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• question_answer53)
  The difference of number of water molecules in gypsum and plaster of Paris is
  A)
  \[\frac{5}{1}\]              
  done clear
  B)
  2    
  done clear
  C)
  \[1/2\]  
  done clear
  D)
  \[1\frac{1}{2}\]
  done clear
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• question_answer54)
  Which is not obtained when metal carbides react with \[{{H}_{2}}O\]?
  A)
  \[A{{l}_{4}}{{C}_{3}}+{{H}_{2}}O\xrightarrow{{}}CH\equiv CH\]
  done clear
  B)
  \[Ca{{C}_{2}}+{{H}_{2}}O\xrightarrow{{}}CH\equiv CH\]
  done clear
  C)
  \[M{{g}_{4}}{{C}_{3}}+{{H}_{2}}O\xrightarrow{{}}C{{H}_{3}}C\equiv CH\]
  done clear
  D)
  \[B{{e}_{2}}C+{{H}_{2}}O\xrightarrow{{}}C{{H}_{4}}\]
  done clear
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• question_answer55)
  \[CaC{{l}_{2}}\] is preferred over \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because:
  A)
  \[CaC{{l}_{2}}\]is less soluble in \[{{H}_{2}}O\] than \[NaCl\]
  done clear
  B)
  \[CaC{{l}_{2}}\] is hygroscopic but \[NaCl\]is not
  done clear
  C)
  Eutectic mixture of \[CaC{{l}_{2}}/{{H}_{2}}O\] freezes at \[-55{}^\circ C\] while that of \[NaCl/{{H}_{2}}O\] freezes at \[-18{}^\circ C\]
  done clear
  D)
  \[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not
  done clear
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• question_answer56)
  Which of the following statement about the sulphate of alkali metal is correct?
  A)
  Except \[L{{i}_{2}}S{{O}_{4}}\] all sulphate of other alkali metals are soluble in water
  done clear
  B)
  All sulphate salts of alkali metals except lithium sulphate forms alum.
  done clear
  C)
  All sulphate salts of alkali metals except lithium sulphate do not decompose at high.  Temperature
  done clear
  D)
  All of the above
  done clear
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• question_answer57)
  \[M{{g}_{2}}{{C}_{3}}\] reacts with water forming propyne gas \[C_{3}^{4-}\] ions has:
  A)
  two sigma and two pi bonds
  done clear
  B)
  three sigma and one pi bond
  done clear
  C)
  two sigma and one pi bond
  done clear
  D)
  two sigma and three pi bonds
  done clear
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• question_answer58)
  If \[NaOH\]is added to an aqueous solution of \[Z{{n}^{2+}}\] ions, a white precipitate appears and on adding excess \[NaOH,\]the precipitate dissolves. In this solution zinc exists in the:
  A)
  both in cafionic and anionic parts
  done clear
  B)
  there is no zinc left in the solution
  done clear
  C)
  cationic part
  done clear
  D)
  anionic part.
  done clear
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• question_answer59)
  Which is incorrect statement?
  A)
  The heats of hydration of the dipositive alkaline earth metal decrease with an increase in their ionic size
  done clear
  B)
  \[NaN{{O}_{3}}\] forms \[N{{a}_{2}}{{O}_{2}}\] on heating
  done clear
  C)
  Hydration of alkali metal ion is less than that of IIA group
  done clear
  D)
  Alkaline earth metal ions, because of their much larger charge to size ratio, exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them
  done clear
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• question_answer60)
  Which of the following does not form an oxide on heating?
  A)
  \[ZnC{{O}_{3}}\]   
  done clear
  B)
  \[CaC{{O}_{3}}\]
  done clear
  C)
  \[L{{i}_{2}}C{{O}_{3}}\]    
  done clear
  D)
  \[N{{a}_{2}}C{{O}_{3}}\]
  done clear
  View Answer play_arrow