Question

The colourless gas with the smell of rotten egg is found in

a. group I
b. group II
c. group III
d. group IV​

Answer 1

Answer:

The colourless gas with the smell of rotten egg is found in group I i.e.option(a).

Explanation:

• A colourless gaseous hydrogen sulphide(H₂S) with a rotten egg odour is created when hydrogen gas is passed over boiling sulphur.
• As for the chemical reaction:

                                         S+H₂⇒H₂S           (1)

Where,

S= sulphur

H₂= hydrogen

H₂S= hydrogen sulphide

A highly potent, colourless gas with a combustible composition, hydrogen sulphide has the smell of rotten eggs. It is extremely caustic and toxic. The presence of hydrogen sulphide can be identified by its smell.

Also, we can see that in hydrogen sulphide there are two elements hydrogen and sulphide belonging to group I and group VIa respectively.

So, the colourless gas with the smell of rotten egg is found in group I i.e.option(a).

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Answer 2

Answer:

Option (a) group I contains the colourless gas with a rotten egg odour.

Explanation:

• When hydrogen gas is run over sulphur that is on the boil, hydrogen sulphide (H2S), a colourless gas with a rotten egg odour, is produced.
• Hydrogen sulphide is a strong, colourless gas with a flammable chemistry and a rotten-egg odour. It is highly poisonous and corrosive. The smell of hydrogen sulphide can be used to detect its presence.
• Additionally, we can observe that hydrogen sulphide contains two elements, hydrogen and sulphide, which are members of groups I and VIa, respectively.
• So, group I, or option(A), contains the colourless gas with the rotten egg odour.

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