Practice free Solutions (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The molar freezing point constant for water is 1.86°C/mole. If 342 g of cane sugar is dissolved in 1000 g of water, the solution will freeze at
The molal freezing point constant for water is 1.86°C/m. Therefore, the freezing point of 0.1 m NaCl solution in water is expected to be [MLNR 1994]
The depression in freezing point of 0.01 M aqueous solutions of urea, sodium chloride and sodium sulphate is in the ratio of [Roorkee 1990; DCE 1994]
Concentration of particles of 0.01 M urea, NaCl and respectively i.e., they are in the ratio 1 : 2 : 3. Hence, depression in freezing point will be in the same ratio.
The Van't Hoff factor for 0.1 M solution is 2.74. The degree of dissociation is [IIT 1999]
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Assertion : Perfectly ideal solution is not possible with respect to binary solution of two liquids.
Reason : No two substances can have exactly the same nature of intermolecular forces & also of the same magnitude.
(A) Assertion is true, Reason is true & Reason is the correct explanation of the Assertion.
Assertion : When a cell is placed in hypertonic solution, it shrinks.
Reason : Reverse osmosis is used for desalination of water.
(B) Assertion is correct because fluids present inside the cell come out due to higher vapour pressure
inside the cell than outside the cell.
Reason is correct because in reverse osmosis, solvent from saline water enters the pure solvent
through semi-permeable membrane.
Assertion : The difference in the boiling points of equimolar solution of HCI and HF decreases as their
molarity is decreased.
Reason : The extent of dissociation decreases steadily with increasing dilution.
(C) Extent of dissociated increases steadily with increasing dilution.
Assertion : When 'a' mL of a 0.1 molal urea solution is mixed with another 'b' mL of 0.1 molal glucose
solution, the boiling point of the solution is no different from the boiling points of the
samples prior to mixing but if 'a' mL of 0.1 molal urea is mixed with 'b' mL of 0.1 molal HF
the boiling point of the mixture is different from the boiling points of the separate
samples.
Reason : HF is an electrolyte (weak) whereas glucose is a non electrolyte.
(A) As degree of dissociation of HF gets changed on dilution.
Pumice stone is an example of:
Gas dispersed in solid → solid foam (pumice).
Given below are two statements:
Statement I: The nutrient deficient water bodies lead to eutrophication.
Statement II: Eutrophication leads to decrease in the level of oxygen in the water bodies.
Choose the correct answer:
Eutrophication is caused by NUTRIENT-RICH (not deficient) water; it does deplete dissolved O₂.
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