10th Standard English Medium Science Subject Solutions Book Back 7 Mark Questions with Solution Part - II

10th Standard

    Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 35
  1. 'A' is a blue coloured crystaline salt. On heating it loses blue colour and to give 'B'. When water is added, 'B' gives back to 'A'. Identify A and B, write the equation.

  2. 1.5 g of solute is dissolved in 15 g of water to form a saturated solution at 298K. Find out the solubility of the solute at the temperature.

  3. What is the mass of sodium chloride that would be needed to form a saturated solution in 50 g of water at 30°C. Solubility of sodium chloride is 36 g at 30°C?

  4. A solution was prepared by dissolving 25 g of sugar in 100 g of water. Calculate the mass percentage of solute.

  5. Find the amount of urea which is to be dissolved in water to get 500 g of 10 % w / w aqueous solution?

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