1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Dinitrogen (N2) and dioxygen (O2) are the main constituents of air, but they do not react with each other to form oxides of nitrogen because,
A
the reaction requires initiation by a catalyst
B
oxides of nitrogen are unstable
C
the reaction is endothermic and requires very high temperature
D
the stoichiometry of N2 and O2 in air is not ideal for the reaction to take place
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The equivalent weight of oxalic acid in C2H2O4 . 2H2O is
A
45
B
63
C
90
D
126
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
On exposure to moist air, copper gains a green oat on its surface due to formation of which one of the following compounds?
A
Copper carbonate
B
Copper oxide
C
Copper sulphate
D
Copper nitrate
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following will not produce carbon dioxide on reacting with an aqueous solution of hydrochloric acid?
A
Limestone
B
Quicklime
C
Chalk
D
Marble
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