Question

An element 'X' forms an oxide with formula X2O3 a State the valency of'X' n Write the formula of chloride of 'X'

Answer 1

Since its oxide is X2O3 valency of X is 3
If we consider halogen as Y then formula would be
XY3

Answer 2

1. X has valency equal to 3

2.

X3+ Cl-

XCl3