Identify the molecule produced when electrical discharges pass through the oxygen in air:

• O₂

• O

• 0₃

• 0₄

Permanent hardness of water can be removed by:

• Boiling

• Cooling

• Clarks method

• Ion exchange method

Which compound has two halogen atoms on adjacent carbon atoms?

• vicinal dihalide

• alkyl halide

• anhydride

• alcohol

The linkage which joins two amino acid units is called:

• peptide bond

• ionic bond

• covalent bond

• metallic bond

Identify the compound responsible for acid rain:

• nitric oxide

• sulphur dioxide

• nitrous oxide

• all of above

The volumetric ratio of hydrogen and oxygen in water is:

• 1;3

• 1;2

• 2;1

• 1;4

The functional group in formaldehyde is

• _CHO

• _COOH

• _OR

• _OH

Conversion of alkene into alkane is done by

• dehydrogenation

• hydrogenation

• alkylation

• acetylation

dehydration of alcohols yield

• CH₂=CH₂

• CH_{3_}CH3

• CH_OR

• NONE

In irreversible reaction equilibrium is established

• established quickly

• never established

• established when reaction stops

• established slowly