21.

Choose the correct answer from the options given below:

Hydrogen chloride gas being highly soluble in water is dried by:

• Anhydrous calcium chloride

• Phosphorous penta oxide

• Quick lime 

• Quick lime 

Choose the correct answer from the option given below:

The brown ring test is used for detection of :

• CO₃^2-

• NO₃^-

• SO_­3^2-

• SO_­3^2-

Choose the correct answer from the options given below:

When dilute sulphuric acid reacts with iron sulphide, the gas evolved is ………

• Hydrogen sulphide

• Sulphur dioxide

• Sulphur trioxide

• Sulphur trioxide

choose the correct answer from the options given below:’

The functional group present in acetic acid is:

• Ketonic C=O

•  Hydroxyl –OH

• Aldehyde –CHO    

• Aldehyde –CHO    

Choose the correct answer from the options given below:

The unsaturated hydrocarbon undergoes:

• A substitution reaction

• An oxidation reaction

• An addition reaction

• An addition reaction

Choose the correct answer from the options given below.
The number of C-H bond in ethane molecule are:

• Four

• Six

• Eight

• Eight

Give reason as to why:

Give the number of the group and the period, of the element having three shells with three electrons in the valence shell.

Given reason as to why:

Hydrogen chloride can be termed as a polar covalent compound?

By drawing an electron dot diagram, show the lone pair effect leading to the formation of ammonium ion from ammonia gas and hydrogen ion.