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Choose the most correct option.
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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Answer the following in one or two sentences.
What is osmotic pressure?
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Answer the following in one or two sentences.
A solution concentration is expressed in molarity and not in molality while considering osmotic pressure. Why?
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Answer the following.
What are isotonic and hypertonic solutions?
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Answer the following.
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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Answer the following.
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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Answer the following.
Explain reverse osmosis.
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Answer the following.
How molar mass of a solute is determined by osmotic pressure measurement?
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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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Select the most appropriate option.
Which of the following reactions is exothermic?
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Answer the following in one or two sentences.
What is standard state of a substance?
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Answer in brief.
How will you calculate reaction enthalpy from data on bond enthalpies?
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Answer in brief.
What is the standard enthalpy of combustion? Give an example.
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Answer the following in one sentence :
The dissociation of H2S is suppressed in the presence of HCl. Name the phenomenon.
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Answer in brief.
How much heat is evolved when 12 g of CO reacts with NO2? The reaction is:
4CO(g) 2NO2(g) → 4CO2(g) + N2(g), ΔrH° = - 1200 kJ
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Answer the following question.
State Hess’s law of constant heat summation. Illustrate with an example. State its applications.
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Answer the following :
The dissociation of HCN is suppressed by the addition of HCl. Explain.
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Answer the following question.
Calculate ΔrH° for the following reaction at 298 K:
1) 2H3BO3(aq) → B2O3(s) + 3H2O(l), ΔrH° = + 14.4 kJ
2) H3BO3(aq) → HBO2(aq) + H2O(l), ΔrH° = - 0.02 kJ
3) H2B4O7(s) → 2B2O3(s) + H2O(l), ΔrH° = + 17.3 kJ
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Calculate the total heat required
a) to melt 180 g of ice at 0 °C
b) heat it to 100 °C and then
c) vapourise it at that temperature.
[Given: ΔfusH° (ice) = 6.01 kJ mol-1 at 0 °C, ΔvapH° (H2O) = 40.7 kJ mol-1 at 100 °C, Specific heat of water is 4.18 J g-1 K-1]
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