Free Printable Chemical Equations and Reactions

1.

In the reaction $Zn\left(s\right)\ +\ H_2SO_4\left(aq\right)\ \rightarrow\ ZnSO_4\left(aq\right)\ +\ H_2\left(g\right)$ , what element has been displaced?

a)

Zn

b)

H

c)

S

d)

O

2.

Which of the following equations represents a decomposition reaction?

a)

$2Sb\left(s\right)\ +\ 3I_2\left(g\right)\ \rightarrow\ 2SbI_3\left(s\right)$

b)

$2HgO\left(g\right)\ \rightarrow\ 2Hg\left(l\right)\ +\ O_2\left(g\right)$

c)

$FeS\left(s\right)\ +\ 2HCl\left(aq\right)\ \rightarrow\ H_2S\left(g\right)\ +\ FeCl_2\left(aq\right)$

d)

$Zn\left(s\right)\ +\ H_2SO_4\left(aq\right)\ \rightarrow\ ZnSO_4\left(aq\right)\ +\ H_2\left(g\right)$

3.

The reaction $Pb\left(NO_3\right)_2\left(aq\right)+2KI\left(aq\right)\rightarrow PBI_2\left(s\right)+2KNO_3\left(aq\right)$ is a

a)

double displacement reaction

b)

synthesis reaction

c)

decomposition reaction

d)

combustion reaction

4.

The reaction $2C_2H_2\left(g\right)+5O_2\left(g\right)\rightarrow4CO_2\left(g\right)+2H_2O\left(l\right)$ is a

a)

double displacement reaction

b)

synthesis reaction

c)

decomposition reaction

d)

combustion reaction

5.

Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) ® Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent

a)

(a) (i), (ii) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (i), (ii) and (iv)

d)

(d) (ii) and (iv)

6.

Which of the following are combination reactions?

a)

(a) (i) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (ii) and (iv)

d)

(d) (ii) and (iii)

7.

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

a)

(i) Displacement reaction

b)

(ii) Precipitation reaction

c)

(iii) Combination reaction

d)

(iv) Double displacement reaction

8.

Which among the following is(are) double displacement reaction(s)? (i) Pb + CuCl₂ --> PbCl₂ + Cu (ii) Na₂SO₄+ BaCl₂ --> BaSO₄ + 2NaCl (iii) C + O₂ --> CO₂ (iv) CH₄ + 2O₂ --> CO₂+ 2H₂O

a)

(a) (i) and (iv)

b)

(b) (ii) only

c)

(c) (i) and (ii)

d)

(d) (iii) and (iv)

9.

The following reaction is used for the preparation of oxygen gas in the laboratory 2KClO₃ (s) + Heat --Catalyst--> 2KCl (s) + 3O₂ (g) Which of the following statement(s) is(are) correct about the reaction?

a)

(a) It is a decomposition reaction and endothermic in nature

b)

(b) It is a combination reaction

c)

(c) It is a decomposition reaction and accompanied by release of heat

d)

(d) It is a photochemical decomposition reaction and exothermic in nature

10.

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

a)

(a) 1:1

b)

(b) 2:1

c)

(c) 4:1

d)

(d) 1:2

11.

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

a)

(i) It is an endothermic reaction

b)

(ii) It is an exothermic reaction

c)

(iii) The pH of the resulting solution will be more than seven

d)

(iv) The pH of the resulting solution will be less than seven

12.

The end material in a chemical reaction is called the ___.

a)

Reactant

b)

Product

13.

Which of the following is a balanced chemical equation?

a)

@@ ext{H}_2 + ext{O}_2 ightarrow ext{H}_2 ext{O}@@

b)

@@2 ext{H}_2 + ext{O}_2 ightarrow 2 ext{H}_2 ext{O}@@

c)

@@ ext{H}_2 + ext{O}_2 ightarrow 2 ext{H}_2 ext{O}@@

d)

@@2 ext{H}_2 + 2 ext{O}_2 ightarrow 2 ext{H}_2 ext{O}@@

14.

In a chemical reaction, the substances that undergo change are called:

a)

Reactants

b)

Products

c)

Catalysts

d)

Inhibitors

15.

What type of reaction is represented by the equation: @@ ext{2Na} + ext{Cl}_2 ightarrow ext{2NaCl}@@?

a)

Decomposition

b)

Synthesis

c)

Single displacement

d)

Double displacement

Chemical Equations and Reactions

Total questions: 15

Worksheet time: 15mins

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