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NEET 2016

Exam: NEET
Year: 2016
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

NEET 2016 · Chemistry · Some Basic Concepts of Chemistry

Suppose the elements X and Y combine to form two compounds X Y _ 2...

Suppose the elements

X

and

Y

combine to form two compounds

X{Y}_{2}

and

{X}_{3}{Y}_{2}

. When

0 . 1mole

of

X{Y}_{2}

weighs

10g

and

0 . 05mole

of

{X}_{3}{Y}_{2}

weighs

9g

, the atomic weights of

X

and

Y

are

Options

A $40, 30$
B $60, 40$
C $20, 30$
D $30, 20$

Correct answer

A. $40, 30$

Step-by-step solution

For

X{Y}_{2}

,

∵ 0.1moleofX{Y}_{2} = 10g

∴ 1moleofX{Y}_{2} = 100g

and

X + 2Y = 100

...(i)

For

{X}_{3}{Y}_{2}

,

∵ 0.05moleof{X}_{3}{Y}_{2} = 9g

∴ 1moleof{X}_{3}{Y}_{2} = 180g

and

3 \text{X} + 2 \text{Y} = 1 8 0

...(ii)

On solving,

X = 40

and

Y = 30

.

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