All Questions - Page 33

Chemistry

$150 \mathrm{~g}$ of acetic acid was contaminated with $10.2 \mathrm{~g}$ ascorbic acid $\left(\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{6}\right)$ to lower down its freezing point by $\left(x \times 10^{-1}\right)^{\circ} \mathrm{C}$ . The value of $x$ is ___________. (Nearest integer)

[Given $\mathrm{K}_{f}=3.9 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ ; molar mass of ascorbic acid $=176 \mathrm{~g} \mathrm{~mol}^{-1}$ ]

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Chemistry

10.30 mg of O₂ is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of O₂ in ppm is__________.

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Chemistry

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are ___________.

A. $1 ~\mathrm{M}$ aq. $\mathrm{NaCl}$ and $2 ~\mathrm{M}$ aq. urea

Chemistry

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g mol⁻¹) and the decrease in freezing point is 0.40 K?

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Chemistry

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)
[K_b = 0.52 K kg mol^{$-$ 1}]

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Chemistry

Considering acetic acid dissociates in water, its dissociation constant is $6.25 \times 10^{-5}$ . If $5 \mathrm{~mL}$ of acetic acid is dissolved in 1 litre water, the solution will freeze at , provided pure water freezes at .

Chemistry

Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

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Chemistry

1.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid is 0.0198 $^\circ$ C. The percentage of dissociation of the acid is ___________. (Nearest integer)

[Given : Density of acetic acid is 1.02 g mL^{$-$ 1}, Molar mass of acetic acid is 60 g mol, K(HO) = 1.85 K kg mol]

Chemistry

The elevation in boiling point for 1 molal solution of non-volatile solute A is $3 \mathrm{~K}$ . The depression in freezing point for 2 molal solution of $\mathrm{A}$ in the same solvent is 6 $K$ . The ratio of and i.e., is . The value of is [nearest integer]

Chemistry

A 20.0 mL solution containing 0.2 g impure H₂O₂ reacts completely with 0.316 g of KMnO₄ in acid solution. The purity of H₂O₂ (in %) is _____________
(mol. wt. of H₂O₂ = 34; mol. wt. of KMnO₄ = 158)

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Chemistry

At 363 K, the vapour pressure of A is 21 kPa and that of B is 18 kPa. One mole of A and 2 moles of B are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture is ___________ kPa. (Round off to the Nearest Integer).

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Chemistry

When 3.00 g of a substance 'X' is dissolved in 100 g of CCl₄, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is ______________ g mol^{$-$ 1}. (Nearest integer).

[Given K_b for CCl₄ is 5.0 K kg mol^{$-$ 1}]

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Chemistry

Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of 0.10 M C₂H₅OH is __________ (Integer answer)

(i) 0.10 M Ba₃(PO₄)₂

(ii) 0.10 M Na₂SO₄

(iii) 0.10 M KCl

(iv) 0.10 M Li₃PO₄

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Chemistry

A 0.5 percent solution of potassium chloride was found to freeze at $-$ 0.24 $^\circ$ C. The percentage dissociation of potassium chloride is ______________. (Nearest integer)
(Molal depression constant for water is 1.80 K kg mol^{$-$ 1} and molar mass of KCl is 74.6 g mol)

Chemistry

1.46 g of a biopolymer dissolved in a 100 mL water at 300 K exerted an osmotic pressure of 2.42 $\times$ 10^{$-$ 3} bar. The molar mass of the biopolymer is _____________ $\times$ 10 g mol. (Round off to the Nearest Integer) [Use : R = 0.083 L bar mol K]

Chemistry

The vapour pressure of $30 \%(\mathrm{w} / \mathrm{v})$ aqueous solution of glucose is __________ $\mathrm{mm} ~\mathrm{Hg}$ at .

Chemistry

Mass of ethylene glycol (antifreeze) to be added to $18.6 \mathrm{~kg}$ of water to protect the freezing point at $-24^{\circ} \mathrm{C}$ is ________ (Molar mass in for ethylene glycol of water )

Chemistry

Solid Lead nitrate is dissolved in 1 litre of water. The solution was found to boil at 100.15 $^\circ$ C. When 0.2 mol of NaCl is added to the resulting solution, it was observed that the solution froze at $-0.8^\circ$ C. The solubility product of PbCl formed is __________ 10 at 298 K. (Nearest integer)

Chemistry

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be $-$ 0.93 $^\circ$ C (K_f(H₂O) = 1.86 K kg mol^{$-$ 1}). The number (n) of benzoic acid molecules associated (assuming 100% association) is ___________.

Chemistry

A solution containing 2.5 $\times$ 10^{$-$ 3} kg of a solute dissolved in 75 $\times$ 10^{$-$ 3} kg of water boils at 373.535 K. The molar mass of the solute is ____________ g mol. [nearest integer] (Given : K(HO) = 0.52 K kg mol and boiling point of water = 373.15 K)

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Question Bank

10.30 mg of O₂ is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of O₂ in ppm is__________.

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are ___________.

A. $1 ~\mathrm{M}$ aq. $\mathrm{NaCl}$ and $2 ~\mathrm{M}$ aq. urea

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g mol⁻¹) and the decrease in freezing point is 0.40 K?

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)
[K_b = 0.52 K kg mol^{$-$ 1}]

Considering acetic acid dissociates in water, its dissociation constant is $6.25 \times 10^{-5}$ . If $5 \mathrm{~mL}$ of acetic acid is dissolved in 1 litre water, the solution will freeze at , provided pure water freezes at .

Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

The elevation in boiling point for 1 molal solution of non-volatile solute A is $3 \mathrm{~K}$ . The depression in freezing point for 2 molal solution of $\mathrm{A}$ in the same solvent is 6 $K$ . The ratio of and i.e., is . The value of is [nearest integer]

A 20.0 mL solution containing 0.2 g impure H₂O₂ reacts completely with 0.316 g of KMnO₄ in acid solution. The purity of H₂O₂ (in %) is _____________
(mol. wt. of H₂O₂ = 34; mol. wt. of KMnO₄ = 158)

At 363 K, the vapour pressure of A is 21 kPa and that of B is 18 kPa. One mole of A and 2 moles of B are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture is ___________ kPa. (Round off to the Nearest Integer).

When 3.00 g of a substance 'X' is dissolved in 100 g of CCl₄, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is ______________ g mol^{$-$ 1}. (Nearest integer).

[Given K_b for CCl₄ is 5.0 K kg mol^{$-$ 1}]

Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of 0.10 M C₂H₅OH is __________ (Integer answer)

(i) 0.10 M Ba₃(PO₄)₂

(ii) 0.10 M Na₂SO₄

(iii) 0.10 M KCl

(iv) 0.10 M Li₃PO₄

A 0.5 percent solution of potassium chloride was found to freeze at $-$ 0.24 $^\circ$ C. The percentage dissociation of potassium chloride is ______________. (Nearest integer)
(Molal depression constant for water is 1.80 K kg mol^{$-$ 1} and molar mass of KCl is 74.6 g mol)

1.46 g of a biopolymer dissolved in a 100 mL water at 300 K exerted an osmotic pressure of 2.42 $\times$ 10^{$-$ 3} bar. The molar mass of the biopolymer is _____________ $\times$ 10 g mol. (Round off to the Nearest Integer) [Use : R = 0.083 L bar mol K]

The vapour pressure of $30 \%(\mathrm{w} / \mathrm{v})$ aqueous solution of glucose is __________ $\mathrm{mm} ~\mathrm{Hg}$ at .

Mass of ethylene glycol (antifreeze) to be added to $18.6 \mathrm{~kg}$ of water to protect the freezing point at $-24^{\circ} \mathrm{C}$ is ________ (Molar mass in for ethylene glycol of water )

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be $-$ 0.93 $^\circ$ C (K_f(H₂O) = 1.86 K kg mol^{$-$ 1}). The number (n) of benzoic acid molecules associated (assuming 100% association) is ___________.

A solution containing 2.5 $\times$ 10^{$-$ 3} kg of a solute dissolved in 75 $\times$ 10^{$-$ 3} kg of water boils at 373.535 K. The molar mass of the solute is ____________ g mol. [nearest integer] (Given : K(HO) = 0.52 K kg mol and boiling point of water = 373.15 K)

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