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Class 9Class 10First YearSecond Year
$10. Tyndall effect is due to:(a) blockage of beam of light(b) non-scattering of beam of light(c) scattering of beam of light(d) passing through beam of light$  $Q13. What is Raoults law. Give its three statements. How this law can help us to understand the ideality of a solution.$  $1. A solution contains 50 \mathrm{~g} of sugar dissolved in 450 \mathrm{~g} of water. What is concentration of this solution?$  $Worked Example 2: The pH of a solution is 9.63. Compute its hydrogen ion concentration.$  $(c) Calculate the concentration of a solution in terms of molality which is obtained by mixing 250 \mathrm{~g} of 20 \% solution of \mathrm{NaCl} with 200 \mathrm{~g} of 40 \% solution of \mathrm{NaCl} .$  $Q 23. 3 g of a non-volatile non-electrolyte solute X are dissolved in 50 \mathrm{~g} of ether (molar mass = 74) at 293 \mathrm{~K} . The vapour pressure of ether falls from 442 torr to 426 torr under these conditions. Calculate the molar mass of solute X .(Ans: 122.6 \mathrm{~g} \mathrm{~mol}^{-1} )$  $9. Tyndall effect is shown by:(a) sugar solution(b) paints(c) jelly(d) chalk solution$  