Test : Chemistry - 3 - Defence MCQ

According to Dalton’s atomic theory the smallest particle which is capable of independent existence is 

Electron was discovered by 

The atom of an element contains 2 electrons in its M shell. The element is 

Which of the following statements regarding oxidation and reduction are correct?

I. In oxidation loss of electron takes place whereas in reduction, gain of electron takes place.

II. In oxidation, gain of electron takes place whereas in reduction, loss of electron takes place.

III. Oxidizing agent decreases the oxidation number but reducing agent increases the oxidation number.

IV. Oxidizing agent increases the oxidation number but reducing agent reduces the oxidation number. Select the correct answer using the codes given below. 

Which one among the following is an electrochemical cell that cannot be charged ? 

A gas is evolved when a piece of zinc metal is placed in dilute sulphuric acid (H₂SO₄) what is the gas ? 

Which one of the following is correct regarding the reaction of fluorine with water?

2F2(g) + 2H20 ( 0 -> 4H + (aq) + 4 F -(a q ) + 0 2(g)

 Which of the following is used as non-stick coating for cooking utensils?

The purest form of iron is -

Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps? 

Burning pyrites ore gives out -

Which one of the following fuels causes minimum air pollution?

 Which gas is used in the purification of drinking water?

Which of the following is a fossil fuel? 

Which one of the following pairs is not correctly matched? 

Which one of the following polymers is used for making bullet-proof windows? 

 ‘Nobel Oil’ is the name of which one of the following explosives?