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1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
In electrolytic refining of copper, the electrolyte is a solution of
A
Acidified copper chloride.
B
Acidified copper sulphate.
C
Potassium chloride.
D
Sodium sulphate.
2
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Solder is an alloy of
A
Cu and Sn.
B
Fe and Zn.
C
Pb and Sn.
D
Ag and Zn.
3
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.
4
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
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