NTPC CBT-2 Chemistry Quiz

Question 1:

If there are two gases , nitrogen dioxide gas and carbon dioxide gas , both have same volume at same temperature and pressure , then ratio of number of moles of gases is

1:2

1:3

1:1

2:3

Question 2:

The vapour pressure of water at 200K in a closed container is 0.2 atm . If the volume of container is doubled, its vapour pressure at 200 K will be

0.8 atm

0.2 atm

0.4 atm

0.6 atm

Question 3:

Which of the following metal is the best conductor of electricity?

Silver

Mercury

Lead

Aluminium

Question 4:

Which one of the following types of glass can cut off ultraviolet rays ?

Crooks glass

Potash glass

Soda glass

Pyrex glass

Question 5:

6 mg of mercury was found in a 5 L sample of water. What is the concentration (molarity) of mercury in ppm? (Atomic mass of mercury = 200 g / mol)

1.2 ppm

6000 ppm

600 ppm

6 ppm

Question 6:

Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are

5,10 and 2 respectively

10,2 and 5 respectively

5,2 and 10 respectively

2,5 and 10 respectively

Question 7:

Which of the following is correct Dobereiner traid ?

Li , Na , Ca

Ca , Sr , Ba

Cl , F , I

Li , Ca , Cl

Question 8:

How many coulombs are required to reduce 1 mole Cr₂O₇^2- to Cr³⁺?

96500 C

579000C

57900C

5790C

Question 9:

Chemical formula of Baking soda

NaHCO₃

NaCl

NaCO3

Na

Question 10:

Which of the following statement is incorrect ?

Atomic radius is measured in picometre.
Atoms do not exist independently
Atoms are the building block of all matters

Only 1

Only 2

Both 1 and 3

None of the above

NTPC CBT-2 Chemistry Quiz - 72

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NTPC CBT-2 Chemistry Quiz - 72

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