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1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Which one of the following statements about dihydrogen (H2) is not correct?
A
H2 is lighter than air and insoluble in water.
B
H2 is inert at room temperature due to high H-H bond dissociation enthalpy.
C
H2 reacts with alkali metals at high temperature to yield metal hydrides.
D
A mixture of NO2 and H2 is known as Syngas.
2
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Which of the following sets of elements has the same valency?
A
Na, Mg, Ca
B
Na, Mg, Al
C
Mg, Ca, K
D
Mg, Ca, Ba
3
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
The process whereby certain minerals absorb water, expand and change is called as
A
Hydration
B
Oxidation
C
Hydrolysis
D
Carbonation
4
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Which one of the following statements about the cleansing action of soap is not true?
A
The oil and dirt gets collected in the centre of the micelle
B
Soap micelles scatter light
C
Soaps are ammonium salts of long chain carboxylic acids
D
Soap forms insoluble precipitates with the calcium and magnesium ions in hard water
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NDA General Ability 13 April 2025 (13) NDA General Ability 21 April 2024 (14) NDA General Ability 3 September 2023 (19) NDA General Ability 16 April 2023 (16) NDA General Ability 4 September 2022 (13) NDA General Ability 10 April 2022 (15) NDA General Ability 18 April 2021 (15)
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