Free online practice tests on Chemical Reactions and Equations for Class X, Science

Chemical Reactions and Equations - 24 Oct 2026

Question 1 of 10

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Complete the reaction

Copper sulphate Hydrogen black PPT
sulphide

CuO
CuS
Cu
Cu(OH)₂

Decomposing reactions are used to

prepare oxide
extract metals
both A and B
None of these

The given reaction is an example of

decomposition reaction
combination reaction
double displacement reaction
displacement reaction

The correct formula for ammonium sulphate is _____

The reactions in which addition and removal of oxygen takes place simultaneously, then the reaction is

Oxidisation
Reduction
Redox
None of these

Practical application of electrolytic decomposition is

saving electricity
generate chemical energy
extraction of metals
easy decomposition

When lime stone is heated, the gas released is

SO₂
CO₂
H₂
NO₂

Which one of the following is not a characteristic of a chemical reaction?

change in temperature, state and colour
evolution of gas
formation of a precipitate
formation of no new substance

If Iron fillings are added to dilute Hydrochloric acid, then

Hydrogen gas and Iron chloride are produced
Chlorine gas and Iron hydroxide are produced
Iron salt and water are produced
No reaction will take place

In the given reaction, identify the oxidising agent

H₂S
Cl₂
S
HCl

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