1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
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
Change Language
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
Change Language
Which one of the following is the lowest possible temperature?
A
0° Celsius
B
-073° Celsius
C
-173° Celsius
D
-273° Celsius
4
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Numerically two thermometers, one in Fahrenheit scale and another in Celsius scale shall read same at
A
-40°
B
0° 
C
-273°
D
100° 
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