Q1) Sodium and chlorine are reacted and as a result, sodium chloride is
formed which is also called table salt. What option gives the reactants
and products of the reaction?
(a) reactants - sodium; products - chlorine
(b) reactants - sodium and table salt; products - chlorine
(c) reactants - tables salt; products - sodium and chlorine
(d) reactants - sodium and chlorine; products - sodium chloride
Correct Answer: Option (d)
Q2) Which of the following reactions can also be termed as thermal
decomposition reaction?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Double displacement reaction
Correct Answer: Option (b)
Q 3) The image shows some chemical reactions.
Which option identifies the reactants and products of
the reactions?
,Correct Answer: Option C
Q4) A student performs an experiment to form aluminium chloride from
aluminium and chlorine. Which options give the chemical equation of the
reaction?
(a) Al + Cl2 → AlCl2
(b) 2Al + Cl2 → 2AlCl
(c) 2Al + 3Cl2 → 2AlCl3
(d) 3Al + 3Cl2 → 3AlCl3
Correct Answer: Option C
Q5. Give the ratio in which hydrogen and oxygen are
present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
Correct Answer: Option (c)
Q6) A researcher adds barium hydroxide to hydrochloric acid to form a
white-colored barium chloride. Which option gives the balanced chemical
equation of the reaction? (a) HCl + Ba(OH)2 → BaCl2 + 2HOH
(b) 2HCl + Ba(OH)2 → BaCl2 + 2HOH
(c) 2HCl + Ba(OH)2 → BaH2 + 2HCl + O2
(d) HCl + 2Ba(OH) → 2BaCl2 + 2HOH + O2
Correct Answer: Option (b)
Q7. One of the following process does not involve a chemical
reaction that is: (a) Melting of candle wax when heated
(b) Burning of candle wax when heated
,(c) Digestion of food in your stomach
(d) Ripening of banana
Correct Answer: Option (a)
Q8) A student writes a chemical equation of the reaction between
carbon monoxide and hydrogen.
CO2 + 2H2 → CH3OH
How can the reaction be classified?
(a) The reaction is an example of a combination reaction as a compound
separates into two compounds.
(b) The reaction is an example of a decomposition reaction as a
compound dissociates into two compounds.
(c) The reaction is an example of a combination reaction as two
compounds react to form a single compound.
(d) The reaction is an example of a decomposition reaction as two
compounds react to form a single compound.
Correct Answer: Option (c)
Q9. The chemical formula of magnesium oxide is?
(a) MgO2
(b) Mg2O
(c) MgO
(d) Mg(OH)2
Correct Answer: Option (c)
Q10) A student learns that some products are formed as a result of
combining two compounds while some compounds are formed as a result
of dissociation of two compounds. The image shows two reactions.
, Which reaction is an example of a combination reaction and a
decomposition reaction? (a) both the reactions are examples of
combination reaction
(b) both the reactions are examples of a decomposition reaction
(c) reaction P is an example of a combination reaction while reaction Q
is an example of a decomposition reaction
(d) P is an example of a decomposition reaction while reaction Q is
an example of a combination reaction
Correct Answer: Option C
Q11) From the following which one is the example of chemical reaction
(a) Grapes get fermented
(b) Breakdown of food
(c) Formation of curd
(d) All of the above
Correct Answer: Option (d) All of the above
Q12) A student adds lead and silver to two different test tubes containing
an equal amount of copper sulphate solution. The student observes that the
color of the solution in the test tube with lead changes. What explains the
change in the colour of the solution?
(a) A displacement reaction takes place as lead replaces copper from
the solution. (b) A combination reaction takes place as lead combines
with sulphate in the solution.
(c) decomposition reaction takes place as copper dissociates from
sulphate in the solution. (d) A double displacement reaction takes place
as copper dissociates from sulphate and lead combines with sulphate in
the solution.
Correct Answer: Option (a)
Q13) Which of the reactions is used in black and
whitephotography? (a) Combination Reaction
formed which is also called table salt. What option gives the reactants
and products of the reaction?
(a) reactants - sodium; products - chlorine
(b) reactants - sodium and table salt; products - chlorine
(c) reactants - tables salt; products - sodium and chlorine
(d) reactants - sodium and chlorine; products - sodium chloride
Correct Answer: Option (d)
Q2) Which of the following reactions can also be termed as thermal
decomposition reaction?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Double displacement reaction
Correct Answer: Option (b)
Q 3) The image shows some chemical reactions.
Which option identifies the reactants and products of
the reactions?
,Correct Answer: Option C
Q4) A student performs an experiment to form aluminium chloride from
aluminium and chlorine. Which options give the chemical equation of the
reaction?
(a) Al + Cl2 → AlCl2
(b) 2Al + Cl2 → 2AlCl
(c) 2Al + 3Cl2 → 2AlCl3
(d) 3Al + 3Cl2 → 3AlCl3
Correct Answer: Option C
Q5. Give the ratio in which hydrogen and oxygen are
present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
Correct Answer: Option (c)
Q6) A researcher adds barium hydroxide to hydrochloric acid to form a
white-colored barium chloride. Which option gives the balanced chemical
equation of the reaction? (a) HCl + Ba(OH)2 → BaCl2 + 2HOH
(b) 2HCl + Ba(OH)2 → BaCl2 + 2HOH
(c) 2HCl + Ba(OH)2 → BaH2 + 2HCl + O2
(d) HCl + 2Ba(OH) → 2BaCl2 + 2HOH + O2
Correct Answer: Option (b)
Q7. One of the following process does not involve a chemical
reaction that is: (a) Melting of candle wax when heated
(b) Burning of candle wax when heated
,(c) Digestion of food in your stomach
(d) Ripening of banana
Correct Answer: Option (a)
Q8) A student writes a chemical equation of the reaction between
carbon monoxide and hydrogen.
CO2 + 2H2 → CH3OH
How can the reaction be classified?
(a) The reaction is an example of a combination reaction as a compound
separates into two compounds.
(b) The reaction is an example of a decomposition reaction as a
compound dissociates into two compounds.
(c) The reaction is an example of a combination reaction as two
compounds react to form a single compound.
(d) The reaction is an example of a decomposition reaction as two
compounds react to form a single compound.
Correct Answer: Option (c)
Q9. The chemical formula of magnesium oxide is?
(a) MgO2
(b) Mg2O
(c) MgO
(d) Mg(OH)2
Correct Answer: Option (c)
Q10) A student learns that some products are formed as a result of
combining two compounds while some compounds are formed as a result
of dissociation of two compounds. The image shows two reactions.
, Which reaction is an example of a combination reaction and a
decomposition reaction? (a) both the reactions are examples of
combination reaction
(b) both the reactions are examples of a decomposition reaction
(c) reaction P is an example of a combination reaction while reaction Q
is an example of a decomposition reaction
(d) P is an example of a decomposition reaction while reaction Q is
an example of a combination reaction
Correct Answer: Option C
Q11) From the following which one is the example of chemical reaction
(a) Grapes get fermented
(b) Breakdown of food
(c) Formation of curd
(d) All of the above
Correct Answer: Option (d) All of the above
Q12) A student adds lead and silver to two different test tubes containing
an equal amount of copper sulphate solution. The student observes that the
color of the solution in the test tube with lead changes. What explains the
change in the colour of the solution?
(a) A displacement reaction takes place as lead replaces copper from
the solution. (b) A combination reaction takes place as lead combines
with sulphate in the solution.
(c) decomposition reaction takes place as copper dissociates from
sulphate in the solution. (d) A double displacement reaction takes place
as copper dissociates from sulphate and lead combines with sulphate in
the solution.
Correct Answer: Option (a)
Q13) Which of the reactions is used in black and
whitephotography? (a) Combination Reaction
