51.

Identify the substance P,Q,R,S and T in each case based on the information given below:

The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.

Correct the following statements:

For example: chlorine is a bleaching agent.

Should read: Moist chlorine is a bleaching agent.

Copper reacts with nitric acid to produce nitrogen dioxide.

Name the gas evolved in each case (formula is not acceptable).

The gas produced by the action of concentrated sulphuric acid on sodium chloride.

Write a fully balanced equation for each of the following case:

Acetic  acid is warmed with ethanol in the presence of concentrated sulphuric acid.

Find the odd one out and explain your choice (note: valency is not a criterion)

C₃H₈, C₅H_{10., ­}C₂H₆, CH₄

Sind the odd one out and explain your choice (note: valency is not a criterion)

Sulphur, phosphorus, carbon, iodine

Identify the substances S based on the information given below:

Give chemical equation for:

 The laboratory preparation of methane from sodium acetate

Give chemical equation for:

The industrial preparation of methanol from water gas.

Give chemical equation for:

The reaction of one mole of ethene with one mole of chlorine gas.