When dilute hydrochloric acid is heated with iron-sulphide, a gas with rotten egg smell is evolved. This gas is

hydrogen

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hydrogen sulphide

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sulphide

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oxygen

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Solution

The correct option is B
hydrogen sulphide

When dilute hydrochloric acid is heated with iron-sulphide, a gas called hydrogen sulphide with rotten egg smell is evolved.

$I r o n s u l p h i d e (s o l i d) + d i l . h y d r o c h l o r i c a c i d (s o l u t i o n) \to I r o n c h l o r i d e (s o l u t i o n) + H y d r o g e n s u l p h i d e (g a s) (r o t t e n e g g s m e l l) ↑$

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When dilute hydrochloric acid is heated with iron-sulphide, a gas with rotten egg smell is evolved. This gas is

The correct option is B hydrogen sulphide When dilute hydrochloric acid is heated with iron-sulphide, a gas called hydrogen sulphide with rotten egg smell is evolved. Iron sulphide(solid)+dil. hydrochloric acid(solution)→Iron chloride(solution)+Hydrogen sulphide(gas) (rotten egg smell)↑