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question_answer1)
Sodium cannot be extracted by the electrolysis of brine solution because:
A)
Sodium liberated reacts with water to produce \[NaOH+{{H}_{2}}\] done
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B)
Sodium being more electropositive than hydrogen, \[{{H}_{2}}\]is liberated at cathode and not sodium done
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C)
electrolysis cannot take place with brine solution done
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D)
none of the above done
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question_answer2)
Soilium chloride imparts a golden yellow colour to the Bunsen flame. This can be interpreted due to:
A)
low ionization potential of sodium done
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B)
photosensitivity of sodium done
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C)
sublimation of metallic sodium to give yellow vapour. done
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D)
emission of excess of energy absorbed as a radiation in the visible region done
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question_answer3)
K, Ca and Li metals may be arranged in the decreasing order of their standard electrode potentials as
A)
K, Ca, Li done
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B)
Li, K, Ca done
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C)
Li, Ca, K done
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D)
Ca, Li, K done
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question_answer4)
Alkli metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
A)
Li done
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B)
Na done
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C)
K done
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D)
Cs done
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question_answer5)
Potassium superoxide (\[K{{O}_{2}}\]) is used in space capsules, submarines, and breathing masks, because it is
A)
diamagnetic in nature done
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B)
high melting compound done
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C)
helpful in removing \[C{{O}_{2}}\]and producing \[{{O}_{2}}\] done
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D)
unstable compound done
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question_answer6)
Sodium is heated n excess of air, free from \[C{{O}_{2}}\]at \[350{}^\circ \]C to from X. X. absorbs \[C{{O}_{2}}\] and forms \[N{{a}_{2}}C{{O}_{3}}\]and Y. 'X' and 'Y' are respectively:
A)
\[N{{a}_{2}}{{O}_{{}}}\]and \[{{O}_{2}}\] done
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B)
\[N{{a}_{2}}{{O}_{2}}\]and \[{{O}_{2}}\] done
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C)
\[Na\]\[{{O}_{2}}\] and \[{{O}_{2}}\] done
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D)
\[N{{a}_{2}}{{O}_{2}}\] and \[{{O}_{3}}\] done
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question_answer7)
The order of melting point of chlorides of alkali metals is:
A)
LiCl> Nacl> KCl> CsCl done
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B)
LiCl> NaCl> KCl> CsCl done
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C)
NaCl> KCl> CsCl> LiCl done
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D)
LiCl> NaCI> CsCl> KCI done
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question_answer8)
A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is:
A)
\[N{{a}_{2}}C{{O}_{3}}\] done
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B)
\[KN{{O}_{3}}\] done
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C)
\[{{K}_{2}}C{{O}_{3}}\] done
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D)
\[Cu{{(OH)}_{2}}\] done
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question_answer9)
\[NaOH\]is prepared by the electrolysis of:
A)
aqueous solution of sodium chloride with platinum electrodes done
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B)
molten sodium chloride with graphite anode and iron cathodes done
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C)
sodium carbonate with platinum electrodes done
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D)
sodium carbonate with nickel electrodes done
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question_answer10)
A and B are two salts. A with dilute HCl and B with cone. \[{{H}_{2}}S{{O}_{4}}\]react to give reddish brown vapours, hence a and B respectively are:
A)
NaBr, \[NaN{{O}_{3}}\] done
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B)
\[NaN{{O}_{3}}\], NaBr done
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C)
NaBr,\[NaN{{O}_{2}}\] done
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D)
\[NaN{{O}_{2}}\], NaBr done
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question_answer11)
At higher temperature sodium metal reacts with alumina to give a sodium compounds 'X', 'X' is dissolved in water and then carbon dioxide gas is passed through it, a compound 'Y' us formed. The compound 'X', 'Y' are respectively
A)
\[N{{a}_{2}}{{O}_{2}}\] and \[N{{a}_{2}}C{{O}_{3}}\] done
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B)
\[N{{a}_{2}}O\] and \[N{{a}_{2}}C{{O}_{3}}\] done
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C)
\[N{{a}_{2}}{{O}_{2}}\] and \[NaAl{{O}_{2}}\] done
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D)
\[NaAl{{O}_{2}}\] and \[N{{a}_{2}}C{{O}_{3}}\] done
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question_answer12)
The correct order regarding the solubility of alkaline earth metal chlorides in water is
A)
\[BeC{{l}_{2}}<MgC{{l}_{2}}<CaC{{l}_{2}}<SrC{{l}_{2}}<BaC{{l}_{2}}\] done
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B)
\[~MgC{{l}_{2}}>CaC{{l}_{2}}>BeC{{l}_{2}}>BaC{{l}_{2}}>SrC{{l}_{2}}\] done
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C)
\[~BaC{{l}_{2}}>MgC{{l}_{2}}>CaC{{l}_{2}}>BeC{{l}_{2}}>SrC{{l}_{2}}\] done
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D)
\[~BeC{{l}_{2}}>MgC{{l}_{2}}>CaC{{l}_{2}}>SrC{{l}_{2}}>BaC{{l}_{2}}\] done
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question_answer13)
A metal M readily forms its sulphate \[MS{{O}_{4}}\]which is watersoluble. It forms its oxide MO which becomes inert on heating. It forms its insoluble hydroxide M\[{{(OH)}_{2}}\] which is soluble in NaOH solution. Then M is
A)
Mg done
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B)
Ba done
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C)
Ca done
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D)
Be done
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question_answer14)
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 \[C{{O}_{2}}\]through 'Y' in water a clear solution 'z' is obtained. On boiling 'Z' compound, 'X' is reformed. The compound 'X' us
A)
\[Ca{{(HC{{O}_{3}})}_{2}}\] done
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B)
\[CaC{{O}_{3}}\] done
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C)
\[N{{a}_{2}}C{{O}_{3}}\] done
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D)
\[{{K}_{2}}C{{O}_{3}}\] done
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question_answer15)
The decreasing order of the second ionization potentials of K, Ca and Ba is
A)
K>Ca>Ba done
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B)
Ca>Ba>K done
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C)
Ba>K>Ca done
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D)
K>Ba>Ca done
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question_answer16)
In the manufacture of metallic sodium by the fused salt electrolysis (Down's process) a small amount of calcium chloride is added to
A)
improve the electrical conduction done
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B)
increase the temperature of electrolysis done
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C)
Bring down the melting temperature done
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D)
Stabilize the metallic sodium done
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question_answer17)
The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to\[30{}^\circ C\]?
A)
Na done
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B)
K done
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C)
Rb done
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D)
Cs done
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question_answer18)
Sodium when heated in a current of dry ammonia gives
A)
Sodium nitrite done
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B)
Sodium hydride done
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C)
Sodium amide done
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D)
Sodium azide done
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question_answer19)
A metal M readily forms sulphate \[MS{{O}_{4}}\]which is water insoluble. It forms oxide MO which becomes inert on heating. It forms insoluble hydroxide which is soluble in NaOH. The metal M is
A)
Mg done
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B)
Ba done
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C)
Ca done
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D)
Be done
clear
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question_answer20)
The compound sprinkled on road to keep them wet and prevent dust form flying is
A)
Calcium hydroxide done
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B)
Calcium chloride done
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C)
Calcium sulphate done
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D)
Calcium hydride done
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question_answer21)
The total number of alkali metals (non-radioactive) which produce superoxide when burn with excess of \[{{O}_{2}}\] is
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question_answer22)
Mole(s) of hydrocarbon produced by hydrolysis of 1 mole \[M{{g}_{2}}{{C}_{3}}\](magnesium carbide) is/are
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question_answer23)
What is the oxidation number of metal in \[Ba{{O}_{2}}\]?
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question_answer24)
\[N{{a}_{2}}{{O}_{2}}\]is a strong oxidizing agent. It oxidises chromic compounds into chromates. How many moles of \[N{{a}_{2}}{{O}_{2}}\]are required to convert two moles of cr\[{{(OH)}_{3}}\]into sodium chromate?
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question_answer25)
What is the number of chlorides in the given list which dissolve in excess of NaOH solution? \[SnC{{l}_{2}};AIC{{l}_{3}},FeC{{l}_{3}},ZnC{{l}_{2}},BeC{{l}_{2}},AgC\]
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