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CBSE - Class 10 Science Chemical Reactions and Equations Worksheet

1.
Write the balanced chemical equation for the following and identify the type of reaction in each case. (c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
2.
Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
3.
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
4.
Write the balanced chemical equation for the following and identify the type of reaction in each case. (d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)
5.
What does one mean by exothermic and endothermic reactions? Give examples.
6.
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
7.
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
8.
Write the balanced chemical equations for the following reactions. (c) Aluminium + Copper chloride → Aluminium chloride + Copper
9.
Why is respiration considered an exothermic reaction? Explain.
10.

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.
11.
Write the balanced chemical equations for the following reactions. (d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
12.

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
13.
Balance the following chemical equations. (c) $NaCl + AgNO_3 \rightarrow AgCl + NaNO_3$
14.

what is h2o

a.

whater

 b.

lassi

 c.

milk

 d.

chockolate
15.
Translate the following statements into chemical equations and then balance them. (b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.
16.
Balance the following chemical equations. (d) $BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + HCl$
17.
Explain the following terms with one example each. (b) Rancidity
18.
Write the balanced chemical equation for the following and identify the type of reaction in each case. (b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
19.
Write the balanced chemical equations for the following reactions. (a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
20.
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)

Worksheet Answers

7.
10.
12.
Option D
14.
Option A
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