NTPC CBT-2 Chemistry Quiz

Question 1:

25 ml water and 10ml of acid is mixed together in a beaker . This process is known as

Dilution

Mixing

Crystallization

Solubility

Question 2:

Basic buffer is the mixture of weak base and its conjugate acid. Example of basic buffer is-

Mixture of acetic acid and sodium acetate.

Mixture of ammonium hydroxide and ammonium chloride.

Phosphate buffer

Human blood

Question 3:

Vacuum distillation is used to separate substances

Decomposes below their boiling point .

Decomposes at the boiling point

Decomposes above their boiling point

Decompose below their melting point .

Question 4:

Molality of 2 g of methanol (CH₃OH) in 80 g of benzene (C₆H₆) is

0.890 m

0.990 m

0.120 m

0.781 m

Question 5:

Gain of electrons occurs during

Oxidation

Reduction

Both 1 and 2

None of these

Question 6:

The usual disease caused by the excessive drinking of alcohol over a long period of time is

Cataract

Cirrhosis

Arthritis

None of these

Question 7:

A numismatist has collecting gold coins , silver coins and copper coins for a long time. One day he observed a black coating on silver coins and green coating on copper ions . Chemical formula of black and green coating is

Silver carbonate , basic copper oxide

Silver sulphide , basic copper carbonate

Silver chloride , basic copper carbonate

Silver sulphide , basic copper sulphide

Question 8:

When the gas sulphur dioxide reacts with hydrogen sulphide, result in formation of water and sulphur. In this reaction sulphur dioxide acts as-

An oxidizing agent

A reducing agent

A dehydrating agent

A catalyst

Question 9:

Which of the following pair of elements does Newlands adjusted in the same slot?

Cr and Ni

Co and Cr

Co and Ni

Co and Mn

Question 10:

When Copper is heated in presence of air , it turns black and form compound A .After passing Hydrogen gas , its brown colour regain .Compound A is

Copper oxide

Copper hydroxide

Copper chloride

Copper carbonate

NTPC CBT-2 Chemistry Quiz - 68

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NTPC CBT-2 Chemistry Quiz - 68

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