Answers Assignment No. – 2 Acids, Bases and Salts | Class 10th

Answers

Assignment No. – 2

Acids, Bases and Salts

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Ans 11. The strength of an acid depends upon its dissociation power whereas concentration depends on water content in the acid.

Ans 12. The actual formula of Plaster of Paris is 2CaSO₄.H₂O which means that one molecule of H₂O is associated with two molecules of CaSO₄. The formula for simplicity is written as CaSO₄. ½H₂O.

Ans 13.  The salt that results due to the above reaction is Ammonium nitrate (NH₄NO₃). The reaction is represented as:

HNO₃ + NH₄OH →  NH₄NO₃ + H₂O

Ans 14. i) A strong base is sodium hydroxide (NaOH) and a weak base is ammonium hydroxide (NH₄OH).

ii) A hydrated salt is copper sulphate crystals (CuSO₄.5H₂O).

Ans 15. (d) Bases turn red litmus blue and acids turn blue litmus red. Basic solution has a pH value more than 7. Since the solution turns red litmus blue, its pH is likely to be 10.

Ans 16. (b) The solution contains HCl.

Ans 17. (d) 16 mL of HCl solution will be required.

Ans 18. (c) Antacid is used for treating indigestion.

Ans 19. a) Two non-hydrated crystalline salts are: sodium chloride (NaCl) and potassium nitrate (KNO₃)

b)     Two neutral salts are: sodium chloride (NaCl) and sodium sulphate (Na₂SO₄)

c)     Two basic salts are: basic copper carbonate (CuCO₃.Cu(OH)₂) and basic lead carbonate (PbCO₃.Pb(OH)₂)

d)     Two acid salts are: sodium bicarbonate (NaHCO₃) and sodium phosphate (NaH₂PO₄)

    Ans 20. The salts of sulphuric acid are bisulphate and sulphate. Examples: NaHSO₄, KHSO₄ and Na₂SO₄.