Question

An element X has a valency 2. It reacts with another element Y to form a molecule XY. If the valency of element Z, which of the following compounds will it form with element Y? (A) YZ (B) Y²Z (C) YZ² (D) Y²Z³

Answer 1

Answer:

YZ²

Explanation:

THE VALENCY OF Y IS ALSO 2 AS IT FORMS XY WHEN REACTS WITH X HAVING VALENCY 2.

ACCORDING TO QUESTION VALENCY OF Z IS 1 . WHEN IT REACTS WITH Y ,  YZ² TYPE OF COMPOUND IS FORMED .

eg. let X= Mg Y= SO4   XY= MgSO4

Z=Na  then YZ² becomes Na²SO4

Answer 2

Answer:

B) $YZ_2$

Explanation:

Element X valency=2

Element Y valency=?

They react to form XY...

When they react together, such that both the elements have atomicity as 1, then they must have been cancelled off. Valencies can be cancelled only when they are same. This means that valency of Y is also 2. Then only they can be cancelled, so as to get a result of XY while reacting.

Hence, valency of element Y=1

Valency of Z=1

When the combine,

Y       Z

2       1     (Using criss-cross method)

=$YZ_2$

Hence, compound formed with Y and Z= $YZ_2$

Hope its clear!!

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