Name: Chemical Reactions: Their Significance and Representation
Uploaded: 2019-07-19
Duration: 4 min 43 s
Description: A chemical reaction or an equation has a lot of parts in it to convey lots of information. Let us learn what it has to unravel for us through this video.

Question

An element

X

forms a compound

{XH}_{3}

with hydrogen. Another element

Y

forms a compound

{YX}_{2}

with

X

. Given that the valency of hydrogen is

1

, what are the valencies of

X

and

Y

?

Accepted Answer

The valency can be defined as it is the combining capacity of atoms.

Let the valency of $X$ in ${XH}_{3}$ is $x$ .
As given in the question, the valency of hydrogen is $1$ .
As, ${XH}_{3}$ is a neutral molecule,

(Valency of $X$ ) + (Valency of $H \times 3$ ) = 0

$(x) + (3 \times 1) = 0$

$x + 3 = 0$

$x = - 3$
So, the valency of $X$ is $3$ , and it needs 3 electrons to complete its octet.

Let's assume the valency of $Y$ in ${YX}_{2}$ = $y$ .

Valency of $X$ is $3$

As, ${YX}_{2}$ is a neutral molecule, so,
(Valency of $Y$ ) $+$ ( $2 \times$ Valency of $X$ ) $= 0$ .

$(y) + (2 x - 3) = 0$

$y = 6$
So, the valency of $Y$ in ${YX}_{2}$ is $6$ .

Hence, the valency of $Y$ is ${YX}_{2}$ and valency of $Y$ is $6$ .

An element $X$ forms a compound ${XH}_{3}$ with hydrogen. Another element $Y$ forms a compound ${YX}_{2}$ with $X$ . Given that the valency of hydrogen is $1$ , what are the valencies of $X$ and $Y$ ?

Important Questions on Structure of Matter

Learn and Prepare for any exam you want !

An element X forms a compound XH3 with hydrogen. Another element Y forms a compound YX2 with X. Given that the valency of hydrogen is 1, what are the valencies of X and Y?

Important Questions on Structure of Matter

Learn and Prepare for any exam you want !

An element $X$ forms a compound ${XH}_{3}$ with hydrogen. Another element $Y$ forms a compound ${YX}_{2}$ with $X$ . Given that the valency of hydrogen is $1$ , what are the valencies of $X$ and $Y$ ?