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CBSE - Class 10 Science Chemical Reactions and Equations Worksheet

1.
What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
a. Hydrogen gas and iron chloride are produced. b. Chlorine gas and iron hydroxide are produced. c. No reaction takes place. d. Iron salt and water are produced.
2.

A student adds zinc granules to dilute hydrochloric acid. Which observation and chemical equation are correct?

a.

Brown gas is evolved; Zn + HCl → ZnCl? + H?

 b.

Colourless gas is evolved; Zn + 2HCl → ZnCl? + H?

 c.

No gas is evolved; Zn + HCl → ZnCl + H?

 d.

Green gas is evolved; Zn + 2HCl → ZnCl? + H?
3.
Explain the following terms with one example each. (a) Corrosion
4.
Write the balanced chemical equation for the following and identify the type of reaction in each case. (a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
5.

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.
6.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
7.

what is h2o

a.

whater

 b.

lassi

 c.

milk

 d.

chockolate
8.

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

a.

Ending 

 b.

Reactants 

 c.

Products 

 d.

Result 
9.
Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
10.
What is a balanced chemical equation? Why should chemical equations be balanced?
11.
Why do we apply paint on iron articles?
12.
What does one mean by exothermic and endothermic reactions? Give examples.
13.
Translate the following statements into chemical equations and then balance them. (d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
14.

' ↑ ' sign means in a chemical equation 

a.

Solid

 b.

Gas

 c.

Liquid

 d.

Level
15.
Why is respiration considered an exothermic reaction? Explain.
16.
Oil and fat containing food items are flushed with nitrogen. Why?
17.
Explain the following in terms of gain or loss of oxygen with two examples each. (b) Reduction
18.
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.
19.

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 
20.

A chemical change may involve

a.

change in colour only

 b.

change in temperature only

 c.

evolution of gas only

 d.

any or all of above

Worksheet Answers

1.
2.
Option B

Solution:

Zinc reacts with dilute HCl to produce zinc chloride and hydrogen gas. The balanced equation is:

Zn + 2HCl → ZnCl₂ + H↑

5.
7.
Option A
8.
Option C
14.
Option B
19.
Option C
20.
Option D
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