Question

An element X belongs to group 2 and period 3 of the periodic table The chemical formulae of its nitrate, sulphate and phosphate respectively will be:

• A. $X{\left(N{O}_3\right)}_2,XS{O}_4,X_3{\left(P{O}_4\right)}_2$
• B. $XN{O}_3,XS{O}_4,XP{O}_4$
• C. $X_3{\left(N{O}_3\right)}_2,X_2{\left(S{O}_4\right)}_2,X_2{\left(P{O}_4\right)}_3$
• D. $X{\left(N{O}_3\right)}_3,X_2{\left(S{O}_4\right)}_3,X_2{\left(P{O}_4\right)}_3$

Answer 1

Answer: (A)

$X{\left(N{O}_3\right)}_2,XS{O}_4,X_3{\left(P{O}_4\right)}_2$

An element X belongs to group 2 and period 3 of the periodic table which means it has valency = 2.Hence the chemical formulae of its nitrate, sulphate and phosphate respectively will be:
$X{\left(N{O}_3\right)}_2,XS{O}_4,X_3{\left(P{O}_4\right)}_2$