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ICSE Class 9 Chemistry Question 28 of 34

The Language of Chemistry — Question 14

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14
Question

Question 1(xiv)

In the compound magnesium nitride (Mg3N2):

P — Mg is trivalent, N is divalent.

Q — Mg is divalent. N is trivalent.

R — Mg is divalent, N is divalent.

Which of the statements given above is/are true?

  1. Only P

  2. Only Q

  3. Only R

  4. Both P and Q

Answer

Only Q

Reason — The valency of elements in compound magnesium nitride (Mg3N2) is,

Mg3N2=Mg23 ↗↖ N2⇒Mg32 ↗↖ N3\text{Mg}_3\text{N}_2 = \underset{\phantom{2}{3}}{\text{Mg}} \space {\nearrow}\mathllap{\nwarrow} \space \underset{2}{\text{N}} \Rightarrow \overset{\phantom{3}{2}}{\text{Mg}} \space {\nearrow}\mathllap{\nwarrow} \space \overset{3}{\text{N}} \\[0.5em]

Hence, Mg is divalent and N is trivalent.