Complex A has a composition of H 12 O 6 C l 3 C r . If the complex on treatment with conc.   H 2 S O 4 loses  13.5 % of its original mass, the correct molecular formula of   A is:

[Given : atomic mass of C r = 52 a m u A and   C l = 35 a m u ]

Option 1 - <p><span class="mathml" contenteditable="false"> <math> <mfenced open="[" close="]" separators="|"> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">r</mi> <msub> <mrow> <mrow> <mfenced separators="|"> <mrow> <mrow> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </mrow> </mrow> </mfenced> </mrow> </mrow> <mrow> <mrow> <mn>4</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfenced> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> <mo>.</mo> <mn>2</mn> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </math> </span></p>
Option 2 - <p><span class="mathml" contenteditable="false"> <math> <mfenced open="[" close="]" separators="|"> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">r</mi> <msub> <mrow> <mrow> <mfenced separators="|"> <mrow> <mrow> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </mrow> </mrow> </mfenced> </mrow> </mrow> <mrow> <mrow> <mn>6</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfenced> <msub> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </msub> </math> </span></p>
Option 3 - <p><span class="mathml" contenteditable="false"> <math> <mfenced open="[" close="]" separators="|"> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">r</mi> <msub> <mrow> <mrow> <mfenced separators="|"> <mrow> <mrow> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </mrow> </mrow> </mfenced> </mrow> </mrow> <mrow> <mrow> <mn>5</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> </mrow> </mrow> </mfenced> <msub> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mo>⋅</mo> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </math> </span></p>
Option 4 - <p><span class="mathml" contenteditable="false"> <math> <mfenced open="[" close="]" separators="|"> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">r</mi> <msub> <mrow> <mrow> <mfenced separators="|"> <mrow> <mrow> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </mrow> </mrow> </mfenced> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfenced> <mo>⋅</mo> <mn>3</mn> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> </math> </span></p>
5 Views|Posted 7 months ago
Asked by Shiksha User
1 Answer
A
7 months ago
Correct Option - 1
Detailed Solution:

Conc. H 2 S O 4  acts as dehydrating agent.

Molar mass of given complex = 266.5 g / m o l .

On treating with conc. H 2 S O 4  the mass

lost by the complex = = 13.5 100 ( 266.5 ) 36 g = 2 moles of H 2 O

Formula of the complex = C r H 2 O 4 C l 2 C l . 2 H 2 O

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Chemistry Ncert Solutions Class 12th 2023

Chemistry Ncert Solutions Class 12th 2023

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