The average molar mass of chlorine is 35 . 5g mol ^ - 1 . The ratio of Cl 35 to Cl 37 in naturally occurring chlorine is close to :

Correct answer: B. 3: 1 cases 35CI & 37CI Molarratio & x & 1 - x cases M _ avg . = 35 × x + 37(1 - x) = 35 .5 35x + 37 - 37x = 35 .5 2x = 1 .5 x = (3)/(4) So, ratio of 35CI : ^ 37 CI = 3: 1

JEE Main 20206 SeptemberEvening Shift

Exam: JEE Main
Year: 2020
Date: 6 September
Shift: Evening Shift
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2020 · 6 September · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

The average molar mass of chlorine is 35 . 5g mol ^ - 1 . The ratio...

The average molar mass of chlorine is

35 . 5g{mol}^{- 1}

. The ratio of

Cl 35

Cl 37

in naturally occurring chlorine is close to :

Options

A $4: 1$
B $3: 1$
C $2: 1$
D $1: 1$

Correct answer

B. $3: 1$

Step-by-step solution

$\begin{cases}35CI & 37CI \\ Molarratio & x & 1 - x\end{cases}$

${M}_{avg} . = 35 \times x + 37\left(1 - x\right) = 35 .5$

$35x + 37 - 37x = 35 .5$

$2x = 1 .5$

$x = \dfrac{3}{4}$

So, ratio of $35CI{:}^{37}CI = 3: 1$

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