Free Printable CHEMICAL REACTIONS AND EQUATIONS

1.

A product named as ‘X’ obtained when a small piece of

magnesium ribbon is burnt in air. Then the ‘X’ is

a)

Magnesium oxide

b)

Magnesium carbonate

c)

Magnesium chloride

d)

Magnesium bicarbonate

2.

One of the following observations helps us to determine

the chemical reaction takes place is

a)

Change in shape

b)

Change in temperature

c)

Change in colour

d)

Both a and b

3.

Complete. $A\ \ +\ \ \ B\ \ \ \ \ \ \rightarrow\ \ \ \ \ \$ $MgO$ . Here A and B are

a)

$\ Mg\ and\ CO_2$

b)

$Mg_2\ and\ O_2$

c)

$Mg\ and\ O_2$

d)

$Mg\ and\ O_3$

4.

Identify the correct and balanced chemical equation.

a)

$4Fe\ \ +\ \ 2H_2O$ $\rightarrow$ $Fe_3O_4\ \ \ +\ \ 2H_2$

b)

$3Fe\ \ +\ \ 4H_2O$ $\rightarrow$ $Fe_3O_{4\ \ \ }+\ \ \ 4H_2$

c)

$4Fe\ \ \ +\ \ \ 4H_2O$ $\rightarrow$ $4Fe_3O_{4\ \ \ }+\ \ \ 4H_2$

d)

$3Fe\ \ \ +\ \ \ 4H_2O$ $\rightarrow$ $4Fe_3O_{4\ \ \ }+\ \ \ 4H_2$

5.

Chemical combination reaction is one in which

a)

One reactant chemically decompose to form two or more products

b)

Exchange of ions between the atoms takes place

c)

One element of compound displaces another element of another compound

d)

Two or more reactants chemically combine together to form only one reactant

6.

Burning of magnesium ribbon in presence of air is an example for

a)

Chemical combination

b)

Chemical decomposition

c)

Chemical displacement

d)

Chemical double displacement

7.

Calcium oxide reacts vigorously with water to produce

a)

$CaCO_{3\ }\ \ \rightarrow\ \ \ CaO\ \ \ +\ \ \ CO_2$ + Heat released

b)

$\ C$ + $O_2$ $\rightarrow$ $CO_2$ + Heat absorbed

c)

$CaO$ + $H_2O$ $\rightarrow$ $Ca\left(OH\right)_2$ + Heat liberated

d)

$2CaO$ + $CO_2$ $\rightarrow$ $2CaCO_3$ + Heat absorbed

8.

Exothermic reaction among the following.

i) Burning of coal

ii) Respiration in animals

iii) Reaction between calcium and water

iv) Decomposition of vegetable matter into compost

a)

ii and iv only

b)

i, ii and iii only

c)

i, iii and iv only

d)

i, ii, iii and iv only

9.

The chemical name of quick lime or lime is

a)

Calcium hydroxide

b)

Calcium oxide

c)

Calcium carbonate

d)

Calcium bicarbonate

10.

Chemical combination reaction is opposite to chemical

decomposition reaction. This is because

a)

One product is formed in both the reactions

b)

Two reactants are participating in both the reactions

c)

Two reactants react to form only one product in combination

reaction

d)

Two reactants decompose to form only one product in

decomposition reaction

11.

$CaO\ \ +\ \ H_2O$ $\rightarrow$ $M$ + $Heat$

a)

$CaCO_3$

b)

$Ca\left(OH\right)_2$

c)

$CaOH$

d)

$CaCl_2$

12.

The gases liberated on heating ferrous sulphate crystals

are

a)

Sulphur dioxide and Sulphur trioxide

b)

Sulphur dioxide and Nitrogen dioxide

c)

Nitrogen dioxide and Sulphur trioxide

d)

Nitrogen dioxide and Nitrogen trioxide

13.

The products obtained on heating lead nitrate are

a)

Lead nitrate, nitrogen dioxide and oxygen

b)

Lead oxide, nitrogen dioxide and carbon dioxide

c)

Lead oxide, nitrogen oxide and oxygen

d)

Lead oxide, nitrogen dioxide and oxygen

14.

In the process of electrolysis of water, the hydrogen gas

is evolved at

a)

Graphite rod

b)

Anode

c)

Cathode

d)

Both at cathode and anode

15.

$Na_2SO_4$    $+\ \ BaCl_2$ $\rightarrow$ $BaSO_4\ \ \ +\ \ 2NaCl$ Here the
precipitate is

a)

a) Barium chloride

b)

b) Sodium sulphate

c)

c) Barium sulphate

d)

d) Sodium chloride

16.

$CuO$ + $H_2$ $\rightarrow$ $Cu$ + $H_2O$ This is

a)

Oxidation reaction

b)

Redox reaction

c)

Reduction reaction

d)

None of these

17.

In exothermic reaction

a)

Heat is liberated

b)

Heat is absorbed

c)

Heat is evolved

d)

Both a and c

18.

A reaction in which the exchange of ions takes place is

called

a)

Chemical decomposition

b)

Chemical double displacement

c)

Chemical displacement

d)

Chemical combination

19.

If a new iron nail is dipped in copper sulphate solution

for few minutes, then the nail gets brown colour on its

surface. This is due to

a)

Iron is not reactive but copper is reactive

b)

Iron and copper have equal reactivity

c)

Iron is less reactive than copper

d)

Iron is more reactive than copper

20.

Generally chips manufacturers usually flush the chips

bags with a gas to prevent rancidity. The gas is

a)

Fluorine

b)

Chlorine

c)

Oxygen

d)

Nitrogen

21.

Identify the odd one

a)

Endothermic reaction – A reaction in which heat is absorbed

b)

Reduction reaction – Loosing of hydrogen takes place in a

reaction

c)

Oxidation reaction – Gaining of oxygen take place in a

reaction

d)

Exothermic reaction – A reaction in which heat or energy is

liberated

22.

Choose the correct option

1. Combination reaction

a) Exchange of ions takes place between the reactants

in a reaction

2. Decomposition reaction

b) Two or more reactants chemically combine to form

only one product

3. Displacement reaction

c) One reactant chemically decomposes to form two or

more products

4. Double displacement reaction

d) A reaction in which one element remove or displace

another element

a)

1-a 2-c 3-b 4-d

b)

1-c 2-d 3-b 4-a

c)

1-d 2-b 3-c 4-a

d)

1-b 2-c 3-d 4-a

23.

The given picture represents

a)

Double decomposition

b)

Electrolytic decomposition

c)

Photolytic decomposition

d)

Thermal decomposition

24.

Action of dilute sulphuric acid with zinc metal gives

a)

Hydrogen gas

b)

Oxygen gas

c)

Nitrogen gas

d)

Chlorine gas

25.

Conversion of silver bromide into silver and bromine is

a

a)

Reduction reaction

b)

Decomposition reaction

c)

Oxidation reaction

d)

Displacement reaction

CHEMICAL REACTIONS AND EQUATIONS - SANTHOSH G S STR GJC SIRA

Total questions: 25

Worksheet time: 25mins

Similar Resources on Wayground