CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 3

Total: 60

Study the diagram given below and identify the gas formed in the reaction.

Carbon di-oxide which extinguishes the burning candle.
Oxygen due to which the candle burns more brightly.
Sulphur dioxide which produces a suffocating smell.
Hydrogen which while burning produces a popping sound.

Solution:

When dilute sulphuric acid is poured on zinc granules, zinc being more reactive than hydrogen displaces it from the acid and forms zinc sulphate and hydrogen gas. Hydrogen is a combustible gas and burns with a popping sound. This can be observed when a burnt match stick is bought near to the beaker. Thus, the gas formed is H2 gas and reaction can be represented as follows:

Zn( s)

Zinc

H2SO4(aq)

Sulphuric acid

→

ZnSO4(aq)

Zinc sulphate

H2(g)↑

Hydrogen

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