NTPC CBT-2 Chemistry Quiz

Question 1:

Which of the following method is used to obtain pure Hydrogen Peroxide ?

Steam distillation

Vacuum Distillation

Distillation

Fractional Distillation

Question 2:

5 g of urea is dissolved in 200 g of water . The percentage by mass of urea in the solution is

2.43 %

1.43 %

3.42 %

1.90 %

Question 3:

Which of the following is the drawback of Dalton atomic theory ?

Atom is neither created nor destroyed

Atom is indivisible

All atoms of an element are identical

Atoms of different elements combine in a fixed ratio to form compounds

Question 4:

Take about 1g CaCO₃ in a test tube. Heat it over a flame, when a colorless gas comes out. The reaction is called a-

Decomposition reaction and redox reaction

Only redox reaction

Only decomposition reaction

Double displacement reaction

Question 5:

Which of the following is the main compound of the voter ink ?

Silver nitrate

Silver chloride

Ammonium sulphate

Ammonium nitrate

Question 6:

Which of the following is used in orthopaedic devices ?

Nylon 6

Buna –N

Natural rubber

PHBV

Question 7:

An unriped mango placed in a concentrated salt solution to prepared pickle shrivels because

It gains water due to osmosis

It lose water due to reverse osmosis

It gains water due to reverse osmosis

It loses water due to osmosis

Question 8:

Electron gain enthalpy is measured in

KJ/mole
Electron volts per atom
Electron volts
KJ

1,2,3

1,2

2,3

3,4

Question 9:

Classical smog is also called ?

Reducing smog

Oxidizing smog

sulfurous smog

photochemical smog

Question 10:

Natural rubber becomes soft at high temperature and brittle at low temperatures , for the manufacturing of tyre rubber is vulcanized by adding

7% sulphur

5% sulphur

9% sulphur

10% sulphur

NTPC CBT-2 Chemistry Quiz - 67

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NTPC CBT-2 Chemistry Quiz - 67

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