Silicon is a polymer of 

• silicon tetrachloride

• dialkyl dichlorosilane

• silane

• tetraalkyl silane

Which is a natural colloid?

• Urea

• Cane-sugar

• Blood

• Sodium chloride

Which one of the following does not contain silver?

• Lunar caustic

• German silver

• Horn silver

• Ruby silver

Catalytic converters are generally made from

• carbon

• alkaline metals

• transition metals

• hydrogen

In the industrial production of vegetable ghee, the process involved is

• dissociation

• reduction

• oxidation

• ionization

Which is not a correct statement?

• Dilute solution contain less amount of solute

• Phenols are acidic

• Its benzene all the atoms lie in one plane

• Methylated spirit contains only methanol

Hard steel contains

• 2 to 5 per cent carbon

• 0.5 to 1.5 per cent carbon

• 0.1 to 0.4 per cent carbon

• 0.01 to 0.04 per cent carbon

What is the chemical name of vinegar?

• Citric acid

• Acetic acid

• Pyruvic acid

• Malic acid

89.

An atomic clock is based on transitions in

• sodium

• caesium

• magnesium

• aluminium

What changes will happen to a bowl of ice and water kept at exactly zero degree celsius?

• All ice will melt

• All water will become ice

• No change will happen

• Only some ice will melt