Question

Ammonia gas is collected by-

a.) Upward displacement of water

b.) Upward displacement of air

c.) Downward displacement of water

d.) Downward displacement of air​

Answer 1

Ammonia gas is collected by (b) the upward displacement of air.

Step-by-step explanation:

The physical characteristics of ammonia gas should be taken into account when collecting it. A colourless gas with a strong smell, ammonia (NH3). Since it is lighter than air, its density is lower than that of the surrounding air. As a result, the denser air can easily displace ammonia gas as it is being collected. This process makes sure that only pure ammonia gas is gathered for use or analysis later on. The ammonia gas can be successfully collected without any contamination from other gases or pollutants by making use of the upward displacement of air.

Answer 2

(d) downward displacement of air

Step-by-step explanation:

Ammonia gas is lighter than air, so it can be collected by the downward displacement of air. This means that the ammonia gas is collected in an inverted gas jar, and the air is displaced by the ammonia gas.

So, the answer is (d) downward displacement of air.

The other options are incorrect.

• Ammonia gas cannot be collected by the upward and downward displacement of water, because ammonia gas is soluble in water.
• Ammonia gas cannot be collected by the upward displacement of air, because ammonia gas is lighter than air.