H2S gas is                                                

Q. H2S gas is                                                

(A) acidic.                                   

(B) non-corrosive.

(C) lighter than air.                     

(D) non-flammable.

Ans: acidic

Sol:

H2S gas, also known as hydrogen sulfide gas, is (A) acidic.

Hydrogen sulfide is an acidic gas that can react with water to produce hydrosulfuric acid (H2S). It can also form acidic solutions when dissolved in water. Additionally, it has a foul odor, similar to that of rotten eggs, which is a characteristic of many acidic compounds.