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JEE Main 20199 JanuaryMorning Shift

Exam: JEE Main
Year: 2019
Date: 9 January
Shift: Morning Shift
Subject: Chemistry
Chapter: Solutions

JEE Main 2019 · 9 January · Morning Shift · Chemistry · Solutions

A solution of sodium sulphate contains 92g of Na ^ + ions per...

A solution of sodium sulphate contains

92g

of

{Na}^{+}

ions per kilogram of water. The molality of

{Na}^{+}

ions in that solution in

mol{kg}^{- 1}

is:

Options

A $16$
B $4$
C $12$
D $8$

Correct answer

B. $4$

Step-by-step solution

Moles of $N{a}^{+} = \dfrac{WeightofN{a}^{+}ions}{Molecularweight} = \dfrac{92}{23} = 4$

Molality is number of moles of solute present per Kg of Solvent

4 mole of $N{a}^{+}$ are present in 1 kg of water Hence, molality of $N{a}^{+}$ ions will be 4

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