Question : Translate the following statements into chemical equations and then balance it.
Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
a) BaCl2 + Al2(SO4)3 → AlCl3 + BaSO4
b) 3BaCl2 + Al2(SO4)3 →2 AlCl3 +3BaSO4
c) BaCl2 + AlSO4 → AlCl2 + BaSO4
d) BaCl3 + Al(SO4)3 → AlCl3 + Ba(SO4)3
Answer : B
Question : Identify the type of reaction in each case.
Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
a) Combination, Decomposition
b) Double displacement, Combination
c) Decomposition, Combination
d) Displacement, Decomposition
Answer : C
Question : The balancing of chemical equations
is in accordance with:
a) Law of combining volumes
b) Law of constant proportions
c) Law of conservation of mass
d) Both b and c
Answer : D
Question : Which of the statements about the reaction below are incorrect?
Fe2O3(s) + 3CO(g) →2Fe(s) +3CO2(g)
a) Iron is getting reduced)
b) Carbon dioxide is getting oxidised)
c) Carbon monoxide is getting oxidised)
d) Iron oxide is getting reduced)
a) a & b
b) a & c
c) c & d
d) all
Answer : C
Question : What type of reaction is respiration
a) Exothermic
b) Endothermic
c) Reduction reaction
d) Combination reaction
Answer : A
Question : Identify the substances that are oxidised and the substances that are reduced in the following reactions. CuO(s) + H2(g)→ Cu(s) + H2O(l)
a) Cu is oxidised, H2O is reduced
b) CuO is oxidised, H2O is reduced
c) H2 is oxidised, CuO is reduced
d) H2 is oxidised, H2O is reduced
Answer : C
Question : A solution of a substance ‘X’ is used for white washing. Name the substance ‘X’ and write its formula)
a) Lime stone, CaCO3
b) Lime , CaCO3
c) Calcium oxide , CaO
d) Calcium carbonate , CaCO3
Answer : C
Question : Write the balanced reaction of Calcium oxide with water and state what type of reaction is this
a) CaO + H2O→ CaOH + H2, displacement
b) CaO + H2O → Ca(OH)2, combination
c) CaO + H2O→ Ca(OH)2, decomposition
d) CaO + H2O→ CaOH, combination
Answer : B
Question : In the equation, a Al + bH2SO4 → c Al2(SO4)3 + dH2 a, b, c, d are respectively -
a) 2, 3, 1, 1
b) 2, 3, 1, 3
c) 2, 3, 2, 3
d) 2, 2, 3, 3
Answer : B
Question : AMg3N2 + bH2O → cMg(OH)2 + dNH3. When the equation is balanced, the coefficients a, b, c, d respectively are -
a) 1, 3, 3, 2
b) 1, 6, 3, 2
c) 1, 2, 3, 2
d) 2, 3, 6, 2
Answer : B
Question : In the reaction xPb(NO3)2 → Heat yPbO(s) + zNO2(g) + O2(g) Values of x, y and z respectively are
a) 1, 1, 2
b) 2, 2, 4
c) 1, 2, 4
d) 4, 2, 2
Answer : B
Question : In the balanced equation Na2CO3 + xHCl → 2NaCl + CO2 + H2O. The value of x is
a) 1
b) 2
c) 3
d) 4
Answer : B
Question : Which of the following chemical equations is an unbalanced one
a) 2NaHCO3 → Na2CO3 + H2O + CO2
b) 2C4H10 + 12O2 → 8CO2 + 10H2O
c) 2Al + 6H2O → 2Al(OH)3 + 3H2
d) 4NH3 + 5O2 → 4NO + 6H2O
Answer : B
Question : Symbol Δ used while representing some chemical changes stands for -
a) light
b) heat
c) catalyst
d) pressure
Answer : B
Question : In the balanced equation : a Fe2O3 + bH2 → cFe + dH2O
The value of a, b, c, d are respectively –
a) 1, 1, 2, 3
b) 1, 1, 1, 1
c) 1, 3, 2, 3
d) 1, 2, 2, 3
Answer : B
Question : Which of the following statements is/are correct ?
a) A chemical equation tells us about the substances involved in a reaction.
b) A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.
c) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.
d) All the above
Answer : D
Question : Which one of the following reaction will not take place ?
a) Zn + FeSO4 → ZnSO4 + Fe
b) 2 Al + 3 MgSO4 → Al2(SO4)3 + 3 Mg
c) Fe + NiSO4 → FeSO4 + Ni
d) Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
Answer : B
Question : Fill in the blank in the chemical equation : ……. + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O
a) Cu
b) 2Cu
c) CuO
d) 2CuO
Answer : A
Question : When lead nitrate reacts with potassium iodide, yellow precipitate of
a) PbI2 is formed
b) KNO3 is formed
c) Pb(NO3)2 is formed
d) PbIO3 is formed
Answer : A
Question : When ferrous hydroxide reacts with hydrochloric acid, ….. and H2O are produced
a) FeCl3
b) FeCl2
c) FeCl4
d) FeCl
Answer : B
Question : Which of the following reactions involves the combination of two elements ?
a) CaO + CO2 → CaCO3
b) 4Na + O2 → 2Na2O
c) SO2 + 1/2 O2 → SO3
d) NH3 + HCl → NH4Cl
Answer : B
Question : Which of the following is a displacement reaction ?
a) CaO + H2O → Ca(OH)2
b) MgCO3 → MgO + CO2
c) 2Na + 2H2O → 2NaOH + H2
d) H2 + Cl2 → 2HCl
Answer : C
Question : AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq). Above reaction is
a) Precipitation reaction
b) Double Displacement reaction
c) Combination reaction
d) A and B both
Answer : D
Question : Which of the following is a decomposition reaction ?
a) NaOH + HCl → NaCl + H2O
b) NH4CNO → H2NCOONH2
c) 2KClO3 → 2KCl + 3O2
d) H2 + I2 → 2HI
Answer : C
Question : Which of the following is a displacement reaction ?
a) CaCO3 → CaO + CO2
b) CaO + 2HCl → CaCl2 + H2O
c) Fe + CuSO4 → FeSO4 + Cu
d) NaOH + HCl → NaCl + H2O
Answer : C
Question : Which of the following is not a decomposition reaction ?
a) CaCO3 → CaO + CO2
b) 2KClO3 → 2KCl + 3O2
c) Digestion of food in body
d) H2 + Cl2 → 2HCl
Answer : D
Question : Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of
a) Combination reaction
b) Double displacement reaction
c) Decomposition reaction
d) Displacement reaction
Answer : D
Question : Neutralization reaction is an example of
a) exothermic reaction
b) endothermic reaction
c) oxidation
d) none of these
Answer : A
Question : Rancidity can be prevented by
a) adding antioxidants
b) packaging oily food in nitrogen gas
c) both A and B
d) none of these
.Answer : C
Question : Reaction of phosphorus and oxygen is an example of
a) oxidation
b) reduction
c) rancidity
d) none of these
Answer : A
Question : When dilute hydrochloric acid is added to zinc pieces taken in a test tube
a) no change takes place
b) the color of the solution becomes yellow
c) a pungent smelling gas gets liberated
d) small bubbles of hydrogen gas appear on the surface of zinc pieces
Answer : D
Question : Plastic bags containing potato chips are filled with an antioxidant, known as
a) oxygen
b) nitrogen
c) hydrogen
d) carbon monoxide
Answer : B
Question : Which of the following statement is incorrect ?
a) In oxidation, oxygen is added to a substance
b) In reduction, hydrogen is added to a substance.
c) Oxidizing agent is oxidized
d) Reducing agent is oxidized
Answer : C
Question : Which of the statement about the following reaction is correct ?
ZnO + CO → Zn + CO2
a) ZnO is being reduced
b) CO is being reduced
c) CO2 is being oxidized
d) ZnO is being oxidized
Answer : A
Question : In the equation, NaOH + HNO3 → NaNO3 + H2O nitric acid is acting as
a) an oxidizing agent
b) an acid
c) a nitrating agent
d) a dehydrating agent
Answer : B
Question : Which of the following metal is protected by a layer of its oxide ?
a) Copper
b) Silver
c) Iron
d) Aluminium
Answer : D
Question : When copper turnings are added to silver nitrate solution, a blue colored solution is formed after some time. It is because, copper
a) oxidizes silver from the solution
b) forms a blue colored complex with AgNO3
c) is oxidized to Cu2+
d) is reduced to Cu2+
Answer : C
Question : In the reaction, 2H2S + SO2 → 3S + 2H2O
a) H2S has been oxidized
b) SO2 has been oxidized
c) H2S is the oxidizing agent
d) SO2 is the reducing agent
Answer : A
Question : The reactian H2 + Cl2 → 2 HCl is a :
a) Decomposition reaction
b) Combination reaction
c) Double displacement reaction
d) Displacement reaction
Answer : B
Question : Which of the following is a decomposition reaction?
a) NaOH + HCl → NaCl + H2O
b) NH4CNO → H2NCONH2
c) 2KClO3 → 2KCl + 3O2
d) H2 + I2 → 2HI
Answer : C
Question : Which of the following is a displacement reaction?
a) CaCO3 → CaO + CO2
b) CaO + 2HCl → CaCl2 + H2O
c) Fe + CuSO4 → FeSO4 + Cu
d) NaOH + HCl → NaCl + H2O
Answer : C
Question : Which of the following stands for a double displacement reaction?
a) 2H2 + O2 → 2H2O
b) 2Mg + O2 → 2MgO
c) AgNO3 + NaCl → AgCl↓ + NaNO3
d) H2 + Cl2 → 2HCl
Answer : C
Question : Which of the following is not a decomposition reaction?
a) CaCO3 → CaO + CO2
b) 2KClO3 → 2KCl + 3O2
c) Digestion of food in body
d) H2 + Cl2 → 2HCl
Answer : D
Question : Which of the following is a redox reaction. 6
a) CaCO3 → CaO + CO2
b) H2 + Cl2 → 2HCl
c) CaO + 2HCl → CaCl2 + H2O
d) NaOH + HCl → NaCl + H2O
Answer : B
Question : Which of the following statements is incorrect?
a) In oxidation, oxygen is added to a substance
b) In reduction, hydrogen is added to a substance
c) Oxidising agent is oxidized
d) Reducing agent is oxidized
Answer : C
Question : Which of the following is a combustion reaction?
a) Boiling of water
b) Melting of wax
c) Burning of petrol
d) None of these
Answer : C
Question : Which of the statements about the following reactions is correct?
ZnO + CO→Zn + CO2
a) ZnO is being oxidized
b) CO is being reduced
c) CO2 is being oxidized
d) ZnO is being reduced
Answer : D
Question : In the balanced equation aFe2O3 + bH2 → cFe + dH2O. The value of a, b, c, d are respectively :
a) 1, 1, 2, 3
b) 1, 1, 1, 1
c) 1, 3, 2, 3
d) 1, 2, 2, 3
Answer : C
Question : Which of the following reactions is not balanced?
a) 2NaHCO3 → Na2CO3 + H2O + CO2
b) 2C4H10 + 12O2 → 5CO2 + 10H2O
c) 2Al + 6H2O → 2Al(OH)3 + 3H2
d) 4NH3 + 5O2 → 4NO + 6H2O
Answer : B
Question : The equation Cu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O
The values of x and y are :
a) 3 and 5
b) 8 and 6
c) 4 and 2
d) 7 and 1
Answer : C
Question : Neutralization reaction is an example of :
a) Exothermic reaction
b) Endothermic reaction
c) Oxidation reaction
d) None of these
Answer : A
Question : Which of the following statements is/are true?
a) The total mass of the system remains same in a chemical change.
b) A chemical change is permanent and irreversible.
c) A physical change is temporary and reversible
d) All of these
Answer : D
Question : Which of the following statements is incorrect?
a) In oxidation, oxygen is added to a substance
b) In reduction, hydrogen is added to a substance
c) Oxidising agent is oxidized
d) Reducing agent is oxidized
Answer : D
Question : Zn(s) + H2SO4(aq) —→ ZnSO4(aq) + H2(g) is an example of :
a) Precipitation reaction
b) Endothermic reaction
c) Evolution of gas
d) Change in colour
Answer : C
Question : When dilute hydrochloric acid is added to iron fillings :
a) Hydrogen gas and ferric chloride and produced
b) Chlorine gas and ferric hydroxide and produced
c) No reaction takes place
d) Iron salt and water are produced
Answer : A
heat
Question : In the reaction xPb(NO3)2 → yPbO + zNO2 + O2 x, y and z are :
a) 1, 1, 2
b) 2, 2, 4
c) 1, 2, 4
d) 4, 2, 2
Answer : B
Question : In the reaction FeSO4 + x →Na2SO4 + Fe(OH)2, x is :
a) Na2SO4
b) H2SO4
c) NaOH
d) None of these
Answer : C
