10th Class Science Chemical Reactions and Equations Question Bank

done Chemical Reactions and Equation Total Questions - 40

• question_answer1)
  What is the reaction in which a substance or substances undergo change to produce new substances with new properties called?
  A)
  A biochemical reaction done clear
  B)
  A nuclear reaction done clear
  C)
  A physical reaction done clear
  D)
  A chemical reaction done clear
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• question_answer2)
  Which substances take part in a chemical reaction?
  A)
  Products                             done clear
  B)
  Reactants                           done clear
  C)
  Mixtures                             done clear
  D)
  Compounds      done clear
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• question_answer3)
  Which of these substances are formed as a result of a chemical reaction?
  A)
  Products                             done clear
  B)
  Reactants                           done clear
  C)
  Mixtures                             done clear
  D)
  Compounds      done clear
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• question_answer4)
  Which of the following conditions is necessary for a chemical reaction?
  A)
  It must be accompanied with change in temperature and pressure. done clear
  B)
  At least one of the reactants must be in a fixed quantity. done clear
  C)
  It must follow the law of conservation of mass. done clear
  D)
  All of the above done clear
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• question_answer5)
  Which of the following is the shorthand representation of a chemical reaction?
  A)
  A symbol                            done clear
  B)
  A formula                           done clear
  C)
  An equation                      done clear
  D)
  All of the above                               done clear
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• question_answer6)
  'X' is an equation which contains equal number of atoms of each element on both the sides. What is 'X'?
  A)
  A balanced equation done clear
  B)
  An unbalanced equation done clear
  C)
  A chemical equation done clear
  D)
  All of the above done clear
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• question_answer7)
  In the given equation, what does 'X' stand for? \[(2)Al+(X){{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+(3){{H}_{2}}\]
  A)
  2                                             done clear
  B)
  3                             done clear
  C)
  1                             done clear
  D)
  5 done clear
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• question_answer8)
  Which of the following are correct about a chemical equation?

  (i) It saves time and space in writing.

  (ii) It does not indicate the rate of a reaction.

  (iii) It tells the ratio of the masses of the reactants and products.

  A)
  Only (i) and (ii) done clear
  B)
  Only (ii) and (iii)                               done clear
  C)
  Only (i) and (iii)                done clear
  D)
  (i), (ii) and (iii) done clear
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• question_answer9)
  Which of the given chemical equations is NOT balanced?
  A)
  \[3Fe+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+4{{H}_{2}}\] done clear
  B)
  \[KCl{{O}_{3}}\to KCl+{{O}_{2}}\] done clear
  C)
  \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] done clear
  D)
  \[Mg+2HCl\,\to \,MgC{{l}_{2}}+{{H}_{2}}\] done clear
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• question_answer10)
  Which of the given chemical equations is balanced?
  A)
  \[{{H}_{2}}{{O}_{2}}\to {{H}_{2}}O+{{O}_{2}}\] done clear
  B)
  \[NaN{{O}_{3}}\to NaN{{O}_{2}}+{{O}_{2}}\] done clear
  C)
  \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] done clear
  D)
  \[A{{l}_{2}}C{{O}_{3}}\to A{{l}_{2}}{{O}_{3}}+C{{O}_{2}}\] done clear
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• question_answer11)
  In which of the following reactions is a compound broken down into two or more substances?
  A)
  Displacement reaction done clear
  B)
  Combination reaction done clear
  C)
  Decomposition reaction done clear
  D)
  Double Decomposition reaction done clear
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• question_answer12)
  In which reaction is a substance decomposed by using electricity?
  A)
  Electrolysis done clear
  B)
  Hydrolysis done clear
  C)
  Decomposition done clear
  D)
  Displacement done clear
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• question_answer13)
  In which reaction is an atom or a group of atoms present in a molecule displaced by another atom?
  A)
  Displacement reaction done clear
  B)
  Double decomposition reaction done clear
  C)
  Decomposition reaction done clear
  D)
  Synthesis reaction done clear
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• question_answer14)
  In which reaction do two compounds exchange their ions to form two new compounds?
  A)
  Displacement reaction done clear
  B)
  Double displacement reaction done clear
  C)
  Synthesis reaction done clear
  D)
  Decomposition reaction done clear
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• question_answer15)
  In which reaction does a solid get separated from the solution?
  A)
  Neutralization reaction done clear
  B)
  Precipitation reaction done clear
  C)
  Redox reaction done clear
  D)
  All of the above done clear
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• question_answer16)
  Identify the substance which oxidises an element.
  A)
  A hydrating agent done clear
  B)
  A dehydrating agent done clear
  C)
  An oxidizing agent done clear
  D)
  A reducing agent done clear
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• question_answer17)
  Identify the substance which reduces a compound.
  A)
  A hydrating agent done clear
  B)
  A dehydrating agent done clear
  C)
  An oxidizing agent done clear
  D)
  A reducing agent done clear
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• question_answer18)
  In which reaction does the addition and the removal of oxygen takes place simultaneously?
  A)
  Oxidation reaction done clear
  B)
  Reduction reaction done clear
  C)
  Redox reaction done clear
  D)
  Precipitation reaction done clear
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• question_answer19)
  Identify the type of reaction illustrated below. \[{{H}_{2}}+C{{l}_{2}}\to 2HCl\]
  A)
  Decomposition reaction done clear
  B)
  Combination reaction done clear
  C)
  Double displacement reaction done clear
  D)
  Displacement reaction done clear
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• question_answer20)
  A Which of the following is a decomposition reaction?
  A)
  \[NaOH+HCl\to NaCl+{{H}_{2}}O\] done clear
  B)
  \[N{{H}_{4}}CNO\to {{H}_{2}}N-CO-N{{H}_{2}}\] done clear
  C)
  \[2KCl{{O}_{3}}\to 2KCl+{{O}_{2}}\] done clear
  D)
  \[{{H}_{2}}+{{I}_{2}}\to 2HI\] done clear
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• question_answer21)
  Which of the following is a displacement reaction?
  A)
  \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] done clear
  B)
  \[CaO+2HCl\to CaC{{l}_{2}}+{{H}_{2}}O\] done clear
  C)
  \[Fe+CuS{{O}_{4}}\to FeS{{O}_{4}}+Cu\] done clear
  D)
  \[NaOH+HCl\to NaCl+{{H}_{2}}O\] done clear
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• question_answer22)
  Which of the following is a redox reaction?
  A)
  \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] done clear
  B)
  \[CuO+{{H}_{2}}\to Cu+{{H}_{2}}O\] done clear
  C)
  \[CaO+2HCl\to CaC{{l}_{2}}+{{H}_{2}}O\] done clear
  D)
  \[NaOH+HCl\to NaCl+{{H}_{2}}O\] done clear
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• question_answer23)
  Which of the following statements is correct about the given reaction? \[ZnO+CO\to Zn+C{{O}_{2}}\]
  A)
  \[ZnO\] is being oxidized. done clear
  B)
  \[CO\] is being reduced. done clear
  C)
  \[C{{O}_{2}}\] is being oxidized. done clear
  D)
  \[ZnO\] is being reduced. done clear
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• question_answer24)
  Which of the given reactions is an odd one?
  A)
  \[\text{Carbon}+\text{Oxygen}\to \text{Carbon dioxide}\] done clear
  B)
  \[\text{Hydrogen}+\text{Chlorine}\to \text{Hydrogen chloride}\] done clear
  C)
  \[\text{Glucose}\to \text{Carbon dioxide}+\text{Water}\] done clear
  D)
  \[\text{Sulphur}+\text{Oxygen}\to \text{Sulphur}\,\text{dioxide}\] done clear
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• question_answer25)
  How is the decomposition of silver chloride carried out?
  A)
  By electricity     done clear
  B)
  By sunlight                         done clear
  C)
  By heat                                done clear
  D)
  By water done clear
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• question_answer26)
  Which of the following statements is correct about the given reaction?  \[\text{AB}+\text{C}\to \text{AC}+\text{B}\]
  A)
  B is more reactive than C. done clear
  B)
  C is more reactive than B. done clear
  C)
  A and B are inert gases. done clear
  D)
  A is more reactive than C. done clear
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• question_answer27)
  Which of the following statements is NOT correct about the given reaction?  \[{{H}_{2}}S+C{{l}_{2}}\to 2HCl+S\]
  A)
  \[C{{l}_{2}}\] gets reduced to \[HCl\]. done clear
  B)
  \[{{H}_{2}}S\] gets oxidized to S. done clear
  C)
  \[C{{l}_{2}}\] is the oxidizing agent. done clear
  D)
  \[{{H}_{2}}S\] is the oxidizing agent. done clear
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• question_answer28)
  Identify a slow, combustion reaction in which glucose present in the body cells combines with oxygen to produce energy.
  A)
  Digestion                            done clear
  B)
  Excretion                            done clear
  C)
  Respiration        done clear
  D)
  Transpiration done clear
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• question_answer29)
  Which metal can prevent the corrosion of tin?
  A)
  \[Zn\]                                   done clear
  B)
  \[Cu\]                  done clear
  C)
  \[Pb\]                                  done clear
  D)
  \[Ag\] done clear
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• question_answer30)
  In the given reaction, what is nA? \[Pb{{(N{{O}_{3}})}_{2}}\to 2Pb+nA+{{O}_{2}}\]
  A)
  \[4N{{O}_{2}}\]                                done clear
  B)
  \[2N{{O}_{3}}\]                                done clear
  C)
  \[2PbN{{O}_{2}}\]                          done clear
  D)
  \[N{{O}_{2}}\] done clear
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• question_answer31)
  Which of the following is a decomposition reaction?
  A)
  \[NaOH+HCl\to NaCl+{{H}_{2}}O\] done clear
  B)
  \[Zn+2HCl\to ZnC{{l}_{2}}+{{H}_{2}}\] done clear
  C)
  \[2KCl{{O}_{3}}\to 2KCl+3{{O}_{2}}\] done clear
  D)
  \[{{H}_{2}}+{{I}_{2}}\to 2HI\] done clear
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• question_answer32)
  Which of the given equations is NOT balanced correctly?
  A)
  \[2Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\] done clear
  B)
  \[2AlC{{l}_{3}}+3Ca{{(OH)}_{2}}\to 2Al{{(OH)}_{3}}+3CaC{{l}_{2}}\] done clear
  C)
  \[2KCl{{O}_{3}}\to 2KCl+3{{O}_{2}}\] done clear
  D)
  \[Mg+{{H}_{2}}O\to Mg{{(OH)}_{2}}+{{H}_{2}}\] done clear
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• question_answer33)
  Which of the following chemical reactions is balanced and also undergoes combustion?
  A)
  \[{{C}_{3}}{{H}_{8}}+5{{O}_{2}}\to 3C{{O}_{2}}+4{{H}_{2}}O\] done clear
  B)
  \[6C{{O}_{2}}+12{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}+6{{H}_{2}}O\] done clear
  C)
  \[{{C}_{3}}{{H}_{6}}+4{{O}_{2}}\to 3C{{O}_{2}}+3{{H}_{2}}O\] done clear
  D)
  \[2Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\] done clear
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• question_answer34)
  Which of the following is oxidised in the given reaction? \[2HgC{{l}_{2}}+SnC{{l}_{2}}\to H{{g}_{2}}C{{l}_{2}}+SnC{{l}_{4}}\]
  A)
  \[HgC{{l}_{2}}\]                                done clear
  B)
  \[SnC{{l}_{2}}\]                                done clear
  C)
  \[SnC{{l}_{4}}\]                                done clear
  D)
  \[Hg\] done clear
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• question_answer35)
  Which of the following chemical equations best describes the formation of rust?
  A)
  \[4Fe+3{{O}_{2}}+x{{H}_{2}}O\to 2F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\] done clear
  B)
  \[Fe+{{H}_{2}}S{{O}_{4}}\to FeS{{O}_{4}}+{{H}_{2}}\] done clear
  C)
  \[2F{{e}_{3}}{{O}_{4}}+{{H}_{2}}O\to 3F{{e}_{2}}{{O}_{3}}+{{H}_{2}}\] done clear
  D)
  \[2FeS{{O}_{4}}\to F{{e}_{2}}{{O}_{3}}+S{{O}_{2}}+S{{O}_{3}}\] done clear
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• question_answer36)
  The given reaction belongs to which kind of chemical reaction? \[\underset{Spdoium\,sulphate}{\mathop{N{{a}_{2}}S{{O}_{4}}(aq)}}\,+BaC{{l}_{2}}\xrightarrow{{}}\underset{Barium\,sulphate}{\mathop{BaS{{O}_{4}}(s)}}\,+2NaCl(aq)\]
  A)
  Combination reaction done clear
  B)
  Decomposition reaction done clear
  C)
  Displacement reaction done clear
  D)
  Double displacement reaction done clear
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• question_answer37)
  Which of the following statements is correct of the given reaction? \[10HN{{O}_{3}}+{{I}_{2}}\to 2HI{{O}_{3}}+10N{{O}_{2}}+4{{H}_{2}}O\]
  A)
  \[{{I}_{2}}\] is an oxidant. done clear
  B)
  \[{{I}_{2}}\] is reduced. done clear
  C)
  \[HN{{O}_{3}}\] is oxidized. done clear
  D)
  \[HN{{O}_{3}}\] is reduced. done clear
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• question_answer38)
  Which gas is used in flush bags of chips to prevent oxidation?
  A)
  Helium                                 done clear
  B)
  Neon                    done clear
  C)
  Nitrogen                             done clear
  D)
  Argon done clear
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• question_answer39)
  Which of the given reactions is a compound - compound combination reaction?
  A)
  Reaction of water with calcium oxide. done clear
  B)
  Reaction of iodine with white phosphorus. done clear
  C)
  Reaction of iron with sulphur. done clear
  D)
  Electrolysis of water. done clear
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• question_answer40)
  In the balanced equation given below, 'a' and 'b' stand for:  \[aFe+b{{H}_{2}}O\to F{{e}_{2}}{{O}_{4}}+{{H}_{2}}\]
  A)
  \[a=3,\,\,b=4\]                                 done clear
  B)
  \[a=4,\,b=3\]                    done clear
  C)
  \[a=2,\,b=5\]                    done clear
  D)
  \[a=3,\,\,b=5\] done clear
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