NTPC CBT-2 Chemistry Quiz - 4

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Question 1:

Alkaline medium ________ rusting of iron 

Question 2:

When calcium metal reacts with sulphuric acid , the reaction stops after a short while . Why ?

Question 3:

Which of the following metals are refined by electrolytic refining method?

Question 4:

The gas which is present in both the natural gas and the bio-gas is 

Question 5:

In which of the following compounds intramolecular hydrogen bonding is present ?

Question 6:

When a base reacts with a metal , which one of the following gas is usually liberated?

Question 7:

Which of the following fuels causes minimum air pollution?

Question 8:

Density of a ideal gas at constant temperature and pressure is

Question 9:

Oil, natural gas and coal are examples of-

Question 10:

In the hydrogen atom, a transition occurs from n = 6 to n = 5 level. It corresponds to which spectral region and spectral series?