Question

What would be the formula of chloride of 'X' if it is a metal and its oxide has the formula 'XO' ?​

Answer 1

Answer : $\boxed{XCl_{2}} \:$

Detailed explanation :

Given that, X is a metal

Also, Formula of the oxide of X is XO.

We know that, An element combines with one atom of oxygen if it's combining capacity Or in other worlds Valency is 2.

So, We know that Valency of X is 2.

But Chlorine has a valency of 1. To satisfy that, Both combining atoms have same valence.

We take two Cl atoms to combine with X.

Therefore, The required chloride of X is
$\sf \: XCl_{2} \:$

Answer 2

First of all , X is a metal .

This means that X has to have a positive charge .

The metal X reacts with oxygen to form XO.

O represents oxygen which has a valency - 2 .

Since XO is the compound , then the metal X must have 2 electrons and its valency is therefore + 2 as it is always positive .

We can verify this :

    X²⁻ +  O²⁻

= > X O

The two will get cancelled .

Hence X has valency + 2 .

Now talking about chloride means that X has to react with chlorine.

Chlorine has valency - 1 .

X²⁺ + Cl¹⁻

= > XCl₂

XCl₂ will be the resultant formula .