Solutions Book Back Questions

10th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. A solution is a __________ mixture.

    (a)

    homogeneous

    (b)

    heterogeneous

    (c)

    homogeneous and heterogeneous

    (d)

    non homogeneous

  2. Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________

    (a)

    12g

    (b)

    11g

    (c)

    16g

    (d)

    20g

  3. A 25% alcohol solution means 

    (a)

    25 ml alcohol in 100 ml of water

    (b)

    25 ml alcohol in 25 ml of water

    (c)

    25 ml alcohol in 75 ml of water

    (d)

    75 ml alcohol in 25 ml of water

  4. 2 x 1 = 2
  5. Solubility is the amount of solute dissolved in _____ g of solvent.

    ()

    100

  6. Volume persentage decreases with increases in temperature because _____.

    ()

    of expansion of liquids

  7. 4 x 1 = 4
  8. Blue vitriol

  9. (1)

    CuSO4.5H2O

  10. Gypsum

  11. (2)

    CaO

  12. Deliquescence

  13. (3)

    CaSO4 .2H2O

  14. Hygroscopic

  15. (4)

    NaOH

    3 x 2 = 6
  16. Define the term: Solution

  17. What is mean by binary solution

  18. A hot saturated solution of copper sulphate forms crystals as it cools. Why?

  19. 2 x 4 = 8
  20. Write notes on
    i) saturated solution
    ii) unsaturated solution

  21. Write notes on various factors affecting solubility

  22. 1 x 7 = 7
  23. Find the mass of potassium chloride would be needed to form a saturated solution in 60 g of water at 303 K? Given that solubility of the KCl is 37 / 100 g at this temperature.

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