Solution -A- contains 1-9 g - L MgCl 2 and solution -B- contains 1-17 g - L of NaCl- At room temperature- the osmotic pressure of-A- Both are equalB- Solution B is greater than AC- Both solutions cannot be determinedD- Solution A is greater than B

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Byju's Answer

Standard XII

Chemistry

Osmotic Pressure

Solution 'A' ...

Question

Solution 'A' contains $1.9 g/L M g C l_{2}$ and solution 'B' contains $1.17 g/L of N a C l$ . At room temperature, the osmotic pressure of:

Solution A is greater than B

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Both are equal

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Solution B is greater than A

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Both solutions cannot be determined

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Solution

The correct option is A Solution A is greater than B
The solution that has a greater number of ions (i.e. higher concentration of ions) would have a higher osmotic pressure.
$1.9 g/L M g C l_{2} = \frac{1.9}{24 + 71} mol/l$
$= \frac{1.9}{95} mol/l = \frac{1.9 \times 3}{95} mol/l$ of ions
$= 0.06 M$
$1.17 g/L N a C l = \frac{1.17}{23 + 35.5} M$
$= \frac{1.17}{58.5} M = \frac{1.17 \times 2}{58.5} mol/l of ions = 0.04 M$
Hence, magnesium chloride has a higher osmotic pressure.

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Question 13
At a given temperature, osmotic pressure of a concentrated solution of asubstance.......... .
(a) is higher than that of a dilute solution
(b) is lower than that of a dilute solution
(c) is same as that of a dilute solution
(d) cannot be compared with osmotic pressure of dilute solution.

Q. Match the items given in Column I and Column II.

	Column I		Column II
$(i)$	Saturated solution	$(a)$	Solution having the same osmotic pressure at a given temperature as that of the given solution.
$(i i)$	Binary solution	$(b)$	A solution whose osmotic pressure is less than that of another.
$(i i i)$	Isotonic solution	$(c)$	Solution with two components
$(i v)$	Hypotonic solution	$(d)$	A solution which contains the maximum amount of solute that can be dissolved in a given amount of solvent at a given temperature.
$(v)$	Solid Solution	$(e)$	A solution whose osmotic pressure is more than another.
$(v i)$	Hypertonic Solution	$(f)$	A solution in the solid phase

Osmotic pressure of 0.1 M solution of NaCl and Na₂SO₄ will be

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Solution 'A' contains 1.9 g/L MgCl2 and solution 'B' contains 1.17 g/L of NaCl. At room temperature, the osmotic pressure of:

Solution 'A' contains $1.9 g/L M g C l_{2}$ and solution 'B' contains $1.17 g/L of N a C l$ . At room temperature, the osmotic pressure of: