Sample questions
You've seen the pattern — here are a few of the actual PYQs.
NDA2022
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
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
NDA2022
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
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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