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1
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following salts is responsible for temporary hardness of water ?
1
Sulphates of calcium 
2
Chlorides of magnesium 
3
Bicarbonates of magnesium 
4
Sulphates of magnesium 
2
NDA General Ability 14th September 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

(Reaction)

List II

(Type)

A.

 CaO(s) + H2O (I) → Ca(OH)2 (aq)

1.

 Single Displacement

B.

 CaCO3 (s) → CaO(s) + CO2(g)

2.

 Double displacement

C.

Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)

3.

Combination

D.

Na2SO4(aq) + BaCl2 (aq) → BaSO4(s) + 2NaCl(aq)

4.

Decomposition
1
A - 2, B - 1, C - 4, D - 3
2
A - 2, B - 4, C - 1, D - 3
3
A - 3, B - 4, C - 1, D - 2
4
A - 3, B - 1, C - 4, D - 2
3
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is an endothermic reaction ?
1
CH4(g) + 2O2(g) → CO2(g) + 2O2(g)
2
C6H12O6(aq) + 6O2(g) → 6CO2(g) + 6H2O(I)
3
N2(g) + 3H2(g) → 2NH3(g)
4
2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)
4
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is known as ‘water gas’ ?
1
H2O + CO2
2
NH3
3
H2 + N2
4
CO + H2
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