The reactivity of the alkali metal sodium with water, is made use of

• in drying of alcohols

• in drying of benzene

• in drying of organic amines

• as a general drying agent

The bleaching action of the bleaching powder is due to the liberation of

• chlorine

• molecular oxygen

• nascent oxygen

• calcium carbonate

Calcium carbide reacts with water to produce

• methane

• ethane

• ethylene

• acetylene

Heating together of sodium ethoxide and ethyl iodide wll give

• ether

• ethyl alcohol

• acetaldehyde

• acetic acid

TEL is

• a petrol fuel

• anti-knocking compound

• Gasoline

• insecticide

The colour of K₂Cr₂O₇ in acidic medium is

• red

• green

• yellow

• pink

Formula of washing soda is

• Na₂CO₃.10H₂O

• Na₂CO₃

• Na₂SO₄.10H₂O

• None of the above

298.

Which one of the following is an s-block element?

• Aluminium

• Chromium

• Niobium

• Potassium

The alkali metal that reacts with nitrogen directly to form nitride is

• Li

• Na

• K

• Rb

A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is

• zinc sulphate

• zinc carbonate

• lead sulphate

• lead carbonate