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CBSE - Class 10 Science Chemical Reactions and Equations Worksheet

1.
A shiny brown coloured element ‘$X$’ on heating in air becomes black in colour. Name the element ‘$X$’ and the black coloured compound formed.
2.
Write the balanced chemical equations for the following reactions. (c) Aluminium + Copper chloride → Aluminium chloride + Copper
3.
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)
4.
Why do we apply paint on iron articles?
5.
Balance the following chemical equations. (c) $NaCl + AgNO_3 \rightarrow AgCl + NaNO_3$
6.
Explain the following terms with one example each. (b) Rancidity
7.
Balance the following chemical equations. (d) $BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + HCl$
8.
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.
9.
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)
10.
Translate the following statements into chemical equations and then balance them. (b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.
11.
Balance the following chemical equations. (b) $NaOH + H_2SO_4 \rightarrow Na_2SO_4 + H_2O$
12.
Why is respiration considered an exothermic reaction? Explain.
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.

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
15.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
16.

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.
17.
Explain the following in terms of gain or loss of oxygen with two examples each. (b) Reduction
18.
Balance the following chemical equations. (a) $HNO_3 + Ca(OH)_2 \rightarrow Ca(NO_3)_2 + H_2O$
19.
Write the balanced chemical equations for the following reactions. (a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
20.

what is h2o

a.

whater

 b.

lassi

 c.

milk

 d.

chockolate

Worksheet Answers

14.
Option D
16.
20.
Option A
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