Question

Identify the correct set of electrovalent compounds from the following in which the metal has electrovalency $2$ and non-metal has electrovalency $3$.

(A) Calcium sulphide
(B) Barium nitride
(C) Magnesium phosphide
(D) Aluminium nitride
(E) Magnesium fluoride

• A. $B$ & $C$
• B. $B$ & $D$
• C. $C$ & $D$
• D. $A,B,C$ & $E$

Answer 1

Answer: (A)

$B$ & $C$

Calcium sulphide($CaS$)-The valency of calcium ion is +2 and the valency of sulphide ion is -2.

Barium nitrate($B{a}_3{N}_2$)- The valency of barium ion is +2 and that of nitride ion is -3.

Magnesium phosphide($M{g}_3{P}_2$)- The valency of barium ion is +2 and that of phosphide ion is -3$

Aluminium nitride($AlN$)- The valency of both ions namely aluminium and nitirde ion is +3 and -3.

Magnesium fluoride($Mg{F}_2$)- Magnesium has valency of +2 while fluoride has -1.