NTPC CBT-2 Chemistry Quiz

Question 1:

Which part of a flame does a goldsmith blow for melting gold and silver?

Outer zone

Inner zone

Middle zone

All of the above

Question 2:

Which of the following statement is correct?

Metal reacts with acid to produce carbon dioxide gas

Metal carbonate react with base to produce hydrogen gas

Metal oxides are basic in nature

Metal hydrogen carbonates react with acid to produce hydrogen gas.

Question 3:

Forest fires are the most common hazards in forests. They are the example of

Rapid combustion

Spontaneous combustion

Explosion

Slow combustion

Question 4:

Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?

Yellow - pink - blue

Yellow-reddish brown-yellow

Yellow-reddish brown-blue

Yellow-blue – pink

Question 5:

A solution is prepared by dissolving a certain amount of solute in 100 g of water. The percentage by mass of a solute in a solution is 1.5 . The mass of solute is

1.260 g

1.340 g

1.523 g

1.789 g

Question 6:

Which of the following postulates of Dalton was failed?

Atoms are indivisible

Atoms of a given element are identical in mass and chemical properties.

All matter is made of very tiny particles called atoms, which participate in chemical reactions.

Atoms combine in the ratio of small whole numbers to form compounds.

Question 7:

Which of the following methods are used for refining of metals having low melting point?

Distillation

Liquation

Electrorefining

Vapour phase refining

Question 8:

Which of the following method is used for the purification of nickel ?

Mond’s process

Van-Arkel method

Zone refining

Liquation

Question 9:

Carbon monoxide is an odorless, colorless gas formed by the incomplete combustion of fuels. Which of the following is true about carbon monoxide gas?

Neutral in nature
Acidic in nature
Poisonous gas
Basic in nature

1,2,3

1,3

2,3

3,4

Question 10:

Silicon carbide is very hard and used as an abrasive. Which of the following product that is obtained after destructive distillation of coal is used for producing silicon carbide?

Coke

Coal tar

Coal gas

Ammoniacal solution

NTPC CBT-2 Chemistry Quiz - 69

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NTPC CBT-2 Chemistry Quiz - 69

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