1
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
2
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Match List I with List II and select the answer using the code given below the Lists:
List I (Chemical Name)  List II (Chemical Formula)
A. Washing soda  1. CaOCl₂
B. Baking soda 2. NaHCO₃
C. Bleaching powder  3. Na₂CO₃·10H₂O
D. Gypsum 4. CaSO₄·2H₂O

Code:

1
(a) - (4) , (b) - (2) , (c) - (1) , (d) - (3) 
2
(a) - (4) , (b) - (1) , (c) - (2) , (d) - (3) 
3
(a) - (3) , (b) - (1) , (c) - (2) , (d) - (4) 
4
(a) - (3) , (b) - (2) , (c) - (1) , (d) - (4) 
3
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following nitrogen oxides may dimerize?
1
N₂O
2
NO₂
3
N₂O₃
4
N₂O₅
4
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements regarding oxidation and reduction reactions is NOT correct?
1
If a substance loses hydrogen during reaction, it is reduced
2
If a substance loses oxygen during reaction, it is reduced
3
If a substance gains hydrogen during reaction, it is reduced
4
If a substance gains oxygen during reaction, it is oxidized
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