1
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is also known as Dry ice in its solid form?
1
SiO₂
2
CO₂
3
CaO
4
MgO
2
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements is NOT correct?
1
A scale measuring hydrogen ion concentration in a solution is called pH scale
2
The higher the hydrogen ion concentration in a solution, higher is its pH
3
We can measure pH generally from 0 to 14 on a pH scale
4
The 'p' in pH stands for 'potenz' in German meaning power
3
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements is NOT correct?
1
Half mole of nitrogen gas is measured 11·2 litre at STP
2
17 gram of ammonia gas contains 6·022 × 10²³ molecules at STP
3
22·4 litre of CO₂ gas at STP contains 44 gram of molecules
4
4 gram of hydrogen gas contains 6·022 × 10²³ molecules
4
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements about a compound is NOT correct?
1
A compound is a substance composed of two or more elements, chemically combined in a fixed proportion
2
Properties of a compound are different from its constituent elements
3

A compound is an impure substance

4
 The constituents of a compound can be separated only by chemical or electrochemical reactions
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