(B) $P$ is a Group $2$ element,which has $2$ valence electrons,so its valency is $2$.$Q$ is a Group $15$ element,which has $5$ valence electrons,so it

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(B) $P$ is a Group $2$ element,which has $2$ valence electrons,so its valency is $2$.$Q$ is a Group $15$ element,which has $5$ valence electrons,so it needs $3$ electrons to complete its octet,making its valency $3$.To form a neutral compound,the charges must be balanced: $P^{2+}$ and $Q^{3-}$.By crossing the valencies,the formula becomes $P_3Q_2$.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Valency and oxidation state

Medium

Consider the following information about elements $P$ and $Q$:

Element Period and Group

$Q$ Period $2$,Group $15$

$P$ Period $3$,Group $2$

Then the formula of the compound formed by $P$ and $Q$ elements is:

A
$PQ$
B
$P_3Q_2$
C
$P_2Q_3$
D
$PQ_2$

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Class 11

Chemistry Questions

Chapter

Classification of Elements and Periodicity in Properties

Subtopic

Valency and oxidation state

Write the name of $Cr_2O_3$ according to stock notation.

Easy

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If the valency of $A$ is $3$ and $B$ is $2$,then the formula of the compound formed is:

Easy

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In the transition of $Zn$ atoms to $Zn^{2+}$ ions,there is a decrease in the

Easy

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Which among the following pairs of elements show the highest oxidation state of $+7$ in their different compounds? (Atomic numbers: $Cr=24, V=23, Mn=25, Cl=17, S=16$)

MediumMHT CET 2020

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The valency of inert gases is

Easy

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Element	Period and Group
$Q$	Period $2$,Group $15$
$P$	Period $3$,Group $2$

Consider the following information about elements $P$ and $Q$: Element Period and Group $Q$ Period $2$,Group $15$ $P$ Period $3$,Group $2$ Then the formula of the compound formed by $P$ and $Q$ elements is:

Similar Questions

Write the name of $Cr_2O_3$ according to stock notation.

If the valency of $A$ is $3$ and $B$ is $2$,then the formula of the compound formed is:

In the transition of $Zn$ atoms to $Zn^{2+}$ ions,there is a decrease in the

Which among the following pairs of elements show the highest oxidation state of $+7$ in their different compounds? (Atomic numbers: $Cr=24, V=23, Mn=25, Cl=17, S=16$)

The valency of inert gases is

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Consider the following information about elements $P$ and $Q$:

Element Period and Group

$Q$ Period $2$,Group $15$

$P$ Period $3$,Group $2$

Then the formula of the compound formed by $P$ and $Q$ elements is: