Question

The diagram shows an experimental set up for the laboratory preparation of a pungent smelling gas. The gas is alkaline in nature.

1. Nature the gas collected in the jar.
2. Write the balance equation for the above preparation.
3. How is the gas being collected?
4. Name the drying agent used.
5. How will you find that the jar is full of gas?

The diagram below shows the set up for the laboratory preparation of a pungent alkaline gas.

1. Name the gas collected in the jar.
2. Give a balanced equation for the above preparation.
3. State how the above gas is collected.
4. Name the drying agent used.
5. State how you will find out that the jar is full of the pungent gas.

Answer 1

1. Ammonia
2. \[\ce{NH4Cl + Ca(OH)2 ->[Heat] CaCl2 + 2H2O + 2NH3↑}\]
3. By downward displacement of air.
4. Quicklime (CaO)
5. Bring moist red litmus paper to the mouth of the inverted jar; it immediately turns blue.
   Or
   Bring a glass rod dipped in hydrochloric acid to the mouth of the inverted jar. If it produces dense white fumes, then the jar is full of gas.