Question

Elements x,y and have 4,5.anda valence.
electrons respectively write molecular formula
of the compounas formed by these
ents individually with hydrogen..
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Answer 1

Correct Question

Two elements X and Y have 4 and 5 electrons respectively in their valence shells. Write the molecular formulas of these compounds when they react with Hydrogen

Solution

According to the Question,

• X has 4 valence electrons

• Y has 5 valence electrons

An atom would need 8 electrons to complete an octet and become stable

Thus,

• X has a valency of 4

• Y has a valency of 3

Also,

• Hydrogen has a valency of 1

Compound formed from X and H :

On criss - crossing,

• The molecular formula of the product is $\sf X H_4$

Compound formed from Y and H :

On criss - crossing,

• The molecular formula of the product is $\sf Y H_3$

Answer 2

Correct Question :-

Elements X and Y have 4 and 5 electrons respectively in their valence shells. Write the molecular formula of this compound when they react with Hydrogen

Solution :-

Given :-

X has 4 valence electrons

and

Y has 5 valence electrons

It means,

Valency of X is 4

and

Valency of Y is 5

To Find :-

Molecular formula of this compound when they react with Hydrogen

As we know that :-

Valency of Hydrogen is 1

Now,

• Compound formed from X and H is :-

On Criss-crossing,

The molecular formula of the product obtained is XH4

And

• Compound formed from Y and H is :-

On Criss-crossing,

The molecular formula of the product obtained is YH3