Solutions - Maharashtra Board STD 12 Science Chemistry Questions

Q 1Answer the following in one or two sentence.2 Marks

What is the effect of temperature on solubility of gas in a liquid?

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Q 2Answer the following in one or two sentence.2 Marks

Define ebullioscopic constant. Write its unit.

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Q 3Answer the following in one or two sentence.2 Marks

Define van’t Hoff factor. How is it related to the degree of dissociation?

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Q 4Answer the following in one or two sentence.2 Marks

State Henry’s law. How does solubility of a gas in water varies with the temperature?

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Q 5Answer the following in one or two sentence.2 Marks

Define the following terms: (i) Isotonic solution (ii) Osmosis.

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Q 6Answer the following in brief.3 Marks

What is the molar mass of a solute if a solution prepared by dissolving $0.822 g$ of it in $0.3 \ dm^3$ of water has an osmotic pressure of $0.196 \ atm.$ at $298 K$?

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Q 7Answer the following in brief.3 Marks

Define 'Cryoscopic constant'. Derive the relation between elevation of boiling point and molar mass of solute.

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Q 8Answer the following in brief.3 Marks

A solution containing $0.73 g$ of camphor $($molar mass $152 \ g \ mol^1)$ in $36.8 g$ of acetone $($boiling point $56.3^\circ C)$ boils at $56.55^\circ C.$ A solution of $0.564 g$ of unknown compound in the same weight of acetone boils at $56.46^\circ C.$ Calculate the molar mass of the unknown compound.

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Q 9Answer the following in brief.3 Marks

Define osmosis. How will you determine molar mass of non-volatile solute by elevation of boiling point.

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Q 10Answer the following in brief.3 Marks

Calculate the mole fraction of solute, if the vapour pressure of pure benzene at certain temperature is$ 640 \ mm Hg$ and vapour pressure of solution of a solute in benzene is $600 \ mm Hg.$

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Q 11Answer the following in detail.4 Marks

Derive the mathematical expression between molar mass of a non-volatile solute and elevation of boiling point. State and explain van't Hoff-Avogadro's law.

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Q 12Answer the following questions:1 Mark

Deﬁne: Cryoscopic constant.

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Q 13Answer the following questions:1 Mark

Write the SI unit of cryoscopic constant.

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Q 14Answer the following questions:1 Mark

Deﬁne: Semipermeable membrane.

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Q 15Answer the following questions:1 Mark

Why is molality of a solution independent of temperature?