1
NDA General Ability 3 September 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following processes involves chemical reaction?
A
Evaporation of petrol
B
Dissolution of salt in water
C
Storing of oxygen gas under pressure in a gas cylinder
D
Burning of magnesium ribbon in air
2
NDA General Ability 3 September 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following metals does NOT react with cold water to liberate hydrogen gas?
A
Potassium
B
Iron
C
Calcium
D
Sodium
3
NDA General Ability 3 September 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language

Consider the following reaction:

2HgO $ \stackrel{\Delta}{\longrightarrow} $ 2Hg + O2

The respective state of HgO, Hg and O2 in the above reaction is

A
Liquid, solid, gas
B
Solid, solid, gas
C
Liquid, solid, liquid
D
Solid, liquid, gas
4
NDA General Ability 3 September 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
A liquid is heated up to a certain temperature. Which one of the following situation would correspond to the boiling of the liquid?
A
When atmospheric pressure becomes equal to the vapour pressure
B
When atmospheric pressure becomes less than vapour pressure
C
When atmospheric pressure becomes higher than the vapour
pressure
D
When vapour pressure becomes equal to the air pressure
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