61.

Give reasons as to why:]

Almost 90% of all known compounds are organic in nature.

Give reasons as to why:

It is dangerous  to burns methane in an insufficient supply of air.

Write the equation for the reaction taking place between 1,2 dibromethane and alcoholic potassium hydroxide.

Write balanced chemical equations for the following:

Monochloro ethane is hydrolysed with aqueous KOH.

Write balanced chemical equations for the following:.

A mixture of soda lime and sodium acetate is heated

Write balanced chemical equations for the following:

Ethanol under high pressure and low temperature is treated with acidified.

Write balanced chemical equations for the following:

Water is added to calcium carbide.

Write balanced chemical equations for the following:
Ethanol reacts with sodium at room temperature.

Q.4 (c) In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.

i) Draw a diagram to show the arrangement used for the absorption of HCl in water.

structure

ii) why is such an arrangement necessary ? give two reasons.

iii) write the chemical equations for the laboratory preparation of HCl gas when the reactants are:

A)     Below 200⁰C.

B)      Above 200⁰C

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

i) Name the  gas collected in the jar.

ii)  Write the balanced equation for the above preparation.

(iii) How is the gas being collected?

(iv) Name the drying agent used.

(v) How will you find that the jar is full of gas?