Which of the given chemical formula is not possible for the elements given below along with their valency.

Element P - 1

Element Q - 2

Element R - 1

Element S - 4

$P_{2} Q$

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$Q R_{2}$

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$S R_{4}$

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$S_{2} Q_{4}$

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Solution

The correct option is D
$S_{2} Q_{4}$

To find the chemical formula we write the symbol of the elements with their valency interchanged and written at the bottom of the symbol. In case there is a common factor in the valency it is removed to get the simplified formula.

Let's take a look at the formulas in the options.

(1) $P_{2} Q$ this is a correct formula.

(2) $Q R_{2}$ this is a correct formula.

(3) $S R_{4}$ this is a correct formula.

(4) $S_{2} Q_{4}$ is not the correct formula. Since there is a common factor of 2 between the valency of both the elements it needs to be cancelled out. Therefore the correct formula will be $S Q_{2}$ .

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Similar questions

Statement-1: An element of valency 2 can combine with an element of valency 1.
Statement-2: To write the chemical formula, one must know the symbol and valency of the elements.

Q. Read the given observations for four elements

_{Z_{1}}^{A_{1}} P,_{Z_{2}}^{A_{2}} Q,_{Z_{3}}^{A_{3}} R

and

_{Z_{4}}^{A_{4}} S

carefully. Here Z represents atomic number and A represents mass number.
(i) Elements P and R shows similar chemical properties.
(ii) Elements Q and S belong to different groups.
(iii) For elements P and R,

Z_{1} = Z_{3}

and

A_{1} \neq A_{3}

.
(iv) For elements Q and S,

Z_{2} \neq Z_{4}

and

A_{2} = A_{4}

.
Which of the following statements is correct?

There are four elements P, Q, R and S with their electronic configuration given in the options. Which of these elements belong to the same group?

Q. Match the elements of given atomic number with their properties.

	Column $I$		Column $I I$
$P$	$11$	$1$	IE is maximum among the given elements
$Q$	$19$	$2$	Alkali metal
$R$	$37$	$3$	Largest size among the given elements
$S$	$55$	$4$	Position next to $K r$

In the given elements, which element does not have 2 valence electrons?

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Which of the given chemical formula is not possible for the elements given below along with their valency. Element P - 1 Element Q - 2 Element R - 1 Element S - 4

Which of the given chemical formula is not possible for the elements given below along with their valency.

Element P - 1

Element Q - 2

Element R - 1

Element S - 4