CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 3 of 60

Marks: +1, -0

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

{\H}_2

gas and reaction can be represented as follows:

{\Zn}_{( {\ s})}↙{\text "Zinc"}+ {\H_2 \SO_{4(\aq)}}↙{\text "Sulphuric acid"} → {{\ZnSO}_{4( {\aq})}}↙{\text "Zinc sulphate"}+ {{\H}_{2( {\g})} ↑}↙{\Hydrogen}

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