The substance that causes the worst air pollution is

What is dry ice?

X-ray was discovered by

A peptide bond is a key feature in

PVC is obtained by the polymerization of

The percentage of nitrogen present in ammonium sulfate is

Food cans are coated with tin and not zinc because

Mortar is a mixture of water, sand and

An emulsifier is an agent which

A dynamo is a device which

Sodium chloride is a

The energy emitted by the sun due to

Which of the following noble gas used in radiotherapy?

The sky appears blue because

When formaldehyde and potassium hydroxide are heated, we get

Electron was discovered by

Detergents are

A liquid said to boil when

Which of the following gas responsible for acid rain?

A bioenergy source obtained by the fermentation of