NTPC CBT-2 Chemistry Quiz - 52

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Question 1:

Which of the following is elements present in ruby ?

Aluminium , oxygen

Nitrogen , oxygen

Aluminium , chlorine

Aluminium , bromine

Silver articles become black after some time when exposed to air because- ?

silver gets oxidized to silver oxide

silver reacts with moist carbon dioxide in the air to form silver carbonate

silver reacts with sulfur in the air to form a coating of silver sulfide

silver reacts with nitrogen oxides in the air to form silver nitrate

Which of the following is not the surface phenomenon ?

Corrosion

Heterogeneous catalysis

Crystallization

Viscosity

The fiber that burns readily with the smell of burning paper is:

Acrylic

Polyester

Cotton

Silk

Which one of the following is gaseous air pollutants ?

Both 2 and 3

Both 1 and 4

Only 3

Only 2