HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

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In calculating osmotic pressure the concentration of solute is expressed in _______.

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A living cell contains a solution which is isotonic with 0.3 M sugar solution. What osmotic pressure develops when the cell is placed in 0.1 M KCl solution at body temperature?

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The osmotic pressure of blood is 7.65 atm at 310 K. An aqueous solution of glucose isotonic with blood has the percentage (by volume)________.

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What is osmotic pressure?

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A solution concentration is expressed in molarity and not in molality while considering osmotic pressure. Why?

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Write the equation relating boiling point elevation to the concentration of the solution.

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What is the effect on the boiling point of water if 1 mole of methyl alcohol is added to 1 dm³ of water? Why?

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What are isotonic and hypertonic solutions?

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A solvent and its solution containing a nonvolatile solute are separated by a semipermeable membrane. Does the flow of solvent occur in both directions? Comment giving a reason.

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The osmotic pressure of CaCl₂ and urea solutions of the same concentration at the same temperature are respectively 0.605 atm and 0.245 atm, calculate van’t Hoff factor for CaCl₂.

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Explain reverse osmosis.

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How molar mass of a solute is determined by osmotic pressure measurement?

While considering boiling point elevation and freezing point depression a solution concentration is expressed in molality and not in molarity. Why?

Explain with diagram the boiling point elevation in terms of vapour pressure lowering.

A solution of citric acid C₆H₈O₇ in 50 g of acetic acid has a boiling point elevation of 1.76 K. If K_b for acetic acid is 3.07 K kg mol^-1, what is the molality of solution?

An aqueous solution of a certain organic compound has a density of 1.063 g mL^-1 , osmotic pressure of 12.16 atm at 25 °C and a freezing point of 1.03 °C. What is the molar mass of the compound?

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Which of the Na following is a buffer solution?

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The enthalpy of formation for all elements in their standard states is _______.

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How are basic buffer solutions prepared?

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If the standard enthalpy of formation of methanol is –238.9 kJ mol^–1 then entropy change of the surroundings will be _______.