1
NDA General Ability 10 April 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is the correct molecular formula of ammonium carbonate if the valency of ammonium ion is (+1) and carbonate anion is (-2)?
A
(NH4)2CO3
B
NH4(CO3)2
C
(NH3)2CO3
D
NH4CO3
2
NDA General Ability 10 April 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is a covalent compound?
A
Calcium oxide
B
Sodium nitride
C
Silicon carbide
D
Zinc sulphide
3
NDA General Ability 10 April 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
The mass number of argon is 40. Which one of the following statements is correct?
A
The number of protons in argon is 22.
B
The number of neutrons in argon is 18.
C
The number of electrons in argon is 18.
D
The sum of numbers of protons and electrons in argon is 40.
4
NDA General Ability 10 April 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following is the correct order of the valencies of elements Ne, Si, N and Mg?
A
Ne < Mg < N < Si
B
Si < N < Mg < Ne
C
Ne < N < Si < Mg
D
Mg < Ne < N < Si
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