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CBSE - Class 10 Science Chemical Reactions and Equations Worksheet

1.
Balance the following chemical equations. (c) $NaCl + AgNO_3 \rightarrow AgCl + NaNO_3$
2.
Translate the following statements into chemical equations and then balance them. (c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
3.
Why do we apply paint on iron articles?
4.

Which gas is packed in chips packet to prevent oxidation of the chips 

a.

Oxygen 

 b.

Carbon dioxide 

 c.

Chlorine 

 d.

Nitrogen 
5.

' ↑ ' sign means in a chemical equation 

a.

Solid

 b.

Gas

 c.

Liquid

 d.

Level
6.
Translate the following statements into chemical equations and then balance them. (d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
7.

What is called the components in RHS of a equation of chemical reaction 

a.

Ending 

 b.

Reactants 

 c.

Products 

 d.

Result 
8.
Why is respiration considered an exothermic reaction? Explain.
9.

What is meant by arrow sign in a equation of chemical reaction?

a.

State of the matter 

 b.

Type of reaction 

 c.

Direction of reaction 

 d.

Sign of equation 
10.
What do you mean by a precipitation reaction? Explain by giving examples.
11.
Explain the following terms with one example each. (b) Rancidity
12.
Explain the following in terms of gain or loss of oxygen with two examples each. (a) Oxidation
13.
What does one mean by exothermic and endothermic reactions? Give examples.
14.

What is called the components in LHS of a chemical reaction equation 

a.

Products

 b.

Starter 

 c.

Beginner 

 d.

Reactants
15.
Which of the statements about the reaction below are incorrect?
$2PbO(s) + C(s) \rightarrow 2Pb(s) + CO_2(g)$
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidised.
(c) Carbon is getting oxidised.
(d) Lead oxide is getting reduced.
a. (a) and (b) b. (a) and (c) c. (a), (b) and (c) d. all
16.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
17.

The reaction is an example of a $Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe$

a.

combination reaction.

 b.

double displacement reaction.

 c.

decomposition reaction.

 d.

displacement reaction.
18.
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
19.

In which reaction, exchange of ions takes place

a.

Combination Reaction 

 b.

Decomposition Reaction 

 c.

Displacement Reaction 

 d.

Double Displacement Reaction 
20.

The correct balanced chemical equation showing exothermic reaction in which natural gas burns in air is

a.

CH4 + O2 → CO2 + 2H2O

 b.

CH4 + 2O? → 2CO2 + 2H2O + Energy

 c.

CH4 + 2O2 → CO2 + 2H2O

 d.

CH4 + 2O2 → CO2 + 2H2O + Energy

Worksheet Answers

4.
Option D
5.
Option B
7.
Option C
9.
Option C
14.
Option D
15.
17.
19.
Option D
20.
Option D
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