Question

Choose the correct option.
(b) Ca(HCO3), V (c) MgSO,
(d) Na2SO4
1. Crystallisation is generally done from
(a) an unsaturated solution
(b) a supersaturated solution
V
(c) a suspension
(d) a colloid
2. Which of the following substances will cause temporary hardness of water?
(a) NaCl
3. Which of the following substances will cause permanent hardness of water?
(a) Mg(HCO3)2
(b) Ca(HCO3)2
(c) MgSO4
(d) NaCl
4. Which of the following substances can remove the temporary as well as permanent hard
water?
(a) Baking soda
(b) Common salt
(c) Washing soda
(d) Rock salt
5. Which of the following is a hygroscopic substance?
(a) Anhydrous calcium sulphate
(b) Silica gel
(c) Hydrochloric acid
(d) Blue vitriol
muistas novis soovi​

Answer 1

Answer:

1 a 2. a 3.c 4.d 5. b answer