11th Chemistry Monthly Test - 4 ( Solutions )

MABS Institution

11th Chemistry Monthly Test - 4 ( Solutions )-Aug 2020

Time : 2.00 Hours

Part - A

Generic 5 - Answer All Question

How would you determine the molar mass from osmotic pressure.

Explain with a suitable diagram and appropriate example, why some non-ideal solution shows positive deviation from Raoult's

A 5% solution of cane sugar in water has freezing point of/271K. Calculate the freezing point of a 5% solution of glucose in water if freezing point of pure water is 273.15K
[Hint: Relate the ratio of \(\Delta\)T_f (cane sugar)/\(\Delta\)T_f (glucose) to molecular mass of solute M(glucose)/M (cane sugar)]

How would you determine molar mass from relative lowering of vapour pressure.

A solution is prepared by dissolving 2.0 g of glucose and 4.0g urea in 100 g of water at 298 K. Calculate the vapour pressure of the solution, if the vapour pressure of pure water is 23.756 torr. (Molecular mass of urea =60 and glucose = 180 g mol^-1)

On dissolving 10.85 g of a non-electrolyte of (molar mass 97g mol^-1 ) in 87g of benzene the boiling point was elevated by 0.25K. Calculate the value of molal boiling point elevation constant of benzene.

How does the change in temperature affect the solubility of a solute in a liquid solvent and gaseous solute in liquid solvent? Explain.

(I) Define solution.
(il) E plain the types of solutions with suitable example.

Calculate the percent by mass of NaC lif 1.75 g of NaCI is dissolved in 7.85 g of water.

A solution of lactose containing 8.45 g of lactose in 100 g of water has a vapour pressure of 4.5 mm of Hg at 0° C. If the vapour pressure of pure water is 4.579 mm of Hg, calculate the molar mass of lactose.

(i) When does a non-ideal solution is said to show a negative deviation?
(ii) Analyse the deviation observed in the solution of phenol and aniline.

(I) Define Solubility
(ii) Explain about the factors that influences the solubility

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11th Chemistry Monthly Test - 4 ( Solutions )

MABS Institution

11th Chemistry Monthly Test - 4 ( Solutions )-Aug 2020

Part - A

Generic 5 - Answer All Question

How would you determine the molar mass from osmotic pressure.

Explain with a suitable diagram and appropriate example, why some non-ideal solution shows positive deviation from Raoult's

How would you determine molar mass from relative lowering of vapour pressure.

A solution is prepared by dissolving 2.0 g of glucose and 4.0g urea in 100 g of water at 298 K. Calculate the vapour pressure of the solution, if the vapour pressure of pure water is 23.756 torr. (Molecular mass of urea =60 and glucose = 180 g mol-1)

On dissolving 10.85 g of a non-electrolyte of (molar mass 97g mol-1 ) in 87g of benzene the boiling point was elevated by 0.25K. Calculate the value of molal boiling point elevation constant of benzene.

How does the change in temperature affect the solubility of a solute in a liquid solvent and gaseous solute in liquid solvent? Explain.

(I) Define solution. (il) E plain the types of solutions with suitable example.

Calculate the percent by mass of NaC lif 1.75 g of NaCI is dissolved in 7.85 g of water.

A solution of lactose containing 8.45 g of lactose in 100 g of water has a vapour pressure of 4.5 mm of Hg at 0° C. If the vapour pressure of pure water is 4.579 mm of Hg, calculate the molar mass of lactose.

(i) When does a non-ideal solution is said to show a negative deviation? (ii) Analyse the deviation observed in the solution of phenol and aniline.

(I) Define Solubility (ii) Explain about the factors that influences the solubility

Comment

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A solution is prepared by dissolving 2.0 g of glucose and 4.0g urea in 100 g of water at 298 K. Calculate the vapour pressure of the solution, if the vapour pressure of pure water is 23.756 torr. (Molecular mass of urea =60 and glucose = 180 g mol^-1)

On dissolving 10.85 g of a non-electrolyte of (molar mass 97g mol^-1 ) in 87g of benzene the boiling point was elevated by 0.25K. Calculate the value of molal boiling point elevation constant of benzene.

(I) Define solution.
(il) E plain the types of solutions with suitable example.

(i) When does a non-ideal solution is said to show a negative deviation?
(ii) Analyse the deviation observed in the solution of phenol and aniline.

(I) Define Solubility
(ii) Explain about the factors that influences the solubility