Question

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Answer 1

Answer:

ans1). Iron sulphide reacts with dilute hydrochloric acid forms hydrogen sulphide (H2S) gas which turns lead acetate paper into shiny black.

ans2). A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction. Sodium metal is heated and may ignite and burn with a characteristic orange flame.

Explanation:

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Answer 2

(i)

When iron (II) sulphide reacts with dil. hydrochloric acid, a gas (hydrogen sulphide) is formed which has a smell of rotten eggs.

FeS (s) + dil 2HCl (aq) → H2S ↑ (g) + FeCl2 (s)

(ii)

As sodium is a very reactive element, thus when a piece of sodium is kept in water, high amount of heat is generated (an exothermic reaction). Hence, we store solid sodium in kerosene to avoid exposure with air.