Assertion : $1 M$ solution of Glauber's salt is isotonic with $1 M$ solution of $K N O_{3}$ . Because Reason: Solutions having same molar concentration of solute may or may not have same osmotic pressure.

Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

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Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

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Assertion is correct but the Reason is incorrect

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Assertion is incorrect but the Reason is correct

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Solution

The correct option is D Assertion is incorrect but the Reason is correct
A 1M solution of Glauber's salt is not isotonic with a 1M solution of $K N O_{3}$ .

Solutions having a same molar concentration of solute may or may not have same osmotic pressure as they may have different values of vant Hoff's factor $i$ .
Hence, The Assertion is incorrect but the Reason is correct

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Assertion :1M solution of Glauber's salt is isotonic with 1M solution of KNO3. Because Reason: Solutions having same molar concentration of solute may or may not have same osmotic pressure.

Assertion : $1 M$ solution of Glauber's salt is isotonic with $1 M$ solution of $K N O_{3}$ . Because Reason: Solutions having same molar concentration of solute may or may not have same osmotic pressure.