Question

2. When ignited, hydrogen burns in oxygen with a 'pop'.
3. Ammonia gives white fumes with hydrogen chloride gas. .
4. Hydrogen sulphide is a sweet-smelling gas.​

Answer 1

Explanation:

2. Hydrogen forms an explosive mixture with air. If the amount of air in the mixture is limited, the explosion is not dangerous and the gas burns with a pop sound.

3. Ammonium chloride, when freshly formed by the reaction of ammonia gas with hydrogen chloride gas, is also a gas. However, it is white in color. So, it appears as if ammonia “fumes” in HCl atmosphere and produces a white smoke.

4. Hydrogen sulfide is a colorless, flammable gas that smells like rotten eggs at low concentration levels in the air. ... At high concentration levels, it has a sickening sweet odor. At extremely high levels, a person can lose their ability to smell the gas and become unaware of its presence

Answer 2

Answer:

2.Hydrogen forms an explosive mixture with air. If the amount of air in the mixture is limited, the explosion is not dangerous and the gas burns with a pop sound.

3.Ammonia gas gives white fumes with HCl of ammonium chloride as -

3.Ammonia gas gives white fumes with HCl of ammonium chloride as -NH 3 +HCl→NH 4Cl

4.Hydrogen sulfide is a colorless, flammable gas that smells like rotten eggs at low concentration levels in the air. ... At high concentration levels, it has a sickening sweet odor. At extremely high levels, a person can lose their ability to smell the gas and become unaware of its presence.

hope it is helpful

mark me as brainlist