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NEET UG CHEMISTRY MCQ: SOLUTIONS

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Application +4 | -1

2.5\mathrm{ }\;L\;\mathrm{ }of\;\mathrm{ }NaCl

solution contain 5 moles of the solute.What is the molarity ?

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Correct option: B

2M

Option B (2M) is correct because molarity is calculated by dividing the number of moles of solute by the volume of the solution in liters.

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Consider the solution of ethanol. In it Assertion: Isotonic solutions don't show net phenomenon of osmosis.

Reason: Isotonic solutions have equal osmotic pressure at constant temperature. 0.2 molal aqueous solution of a monobasic acid is 60% ionised. If Kb for water is

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B

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A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. the vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be