53. The maximum permissible limit for fluoride in drinking water is
(A) 0.1 mg/litre (B) 1.5 mg/litre
(C) 5 mgi/litre (D) 10 mg/litre
54. What is the working pH range for methyl orange ?
(A) 64-0 (8) 12-8 (6) 3.1-4 (0) 60-8
55. Which of the following are least soluble forms of Ca and Mg at Normal water
temperature ?
(A) CaCl, and MgCO, ൯ Ca(HCO,), and MgCl,
(C) Ca(OH), and Mg(HCO,), @) CaCO, and Mg(OH),
56. A water sample has a pH of 9.25. The....
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