NTPC CBT-2 Chemistry Quiz - 11

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Question 1:

Nitrogen and oxygen combine to form two oxides, Nitric oxide(NO) and nitrogen dioxide in which the ratio of the weights of nitrogen and oxygen is respectively 14:16 and 14:32 . This illustrates the

Question 2:

The second excited state for hydrogen atom is 

Question 3:

Which of the following is used to absorb the neutrons in nuclear reactors?

Question 4:

Substance A has the following properties 

  1. It is stored under high pressure 
  2. On decreasing pressure to 1 atm , it directly converts from solid state to vapor state 
  3. It is used as refrigerant for ice – cream 

Substance A is 

Question 5:

To protect steel and iron from rusting , a thin layer of which one of the following metals is applied ? 

Question 6:

 Composition of brass is-

Question 7:

Which of the following represents 1 amu?

Question 8:

Tooth enamel is made up of 

Question 9:

Suggest separation technique one would need to employ to separate the following mixtures mercury and water?

Question 10:

The instant burning of LPG in a gas stove is the example of 

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