the hardness of water is caused by; a. all of the these b. Mg(HCo3)2 c. CaCl2 d. CaSo4

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Q. Different water samples A, B, C and D have 150 ppm each of

C a C l_{2}, M g S O_{4}, C a S O_{4} a n d M g C l_{2}

respectively. The order of degree of hardness of these samples is

1

kg of a sample of water contains

222

mg of

C a C l_{2}

and

219

mg of

M g (H C O_{3})_{2}

. Its permanent hardness and temporary hardness in ppm are respectively:

Q. Permanent hardness is due to

S O_{4}^{2 -}

and

C l^{-}

C a^{2 +}

and

M g^{2 +}

and is removed by the addition of

N a_{2} C O_{3}

C a S O_{4} + N a_{2} C O_{3} ⟶ C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} ⟶ C a C O_{3} + 2 N a C l

If hardness is

100

ppm

C a C O_{3}

, amount of

N a_{2} C O_{3}

required to soften

10

L of hard water is :

Q. Different water samples A, B, C and D have 150 ppm each of

C a C l_{2}, M g S O_{4}, C a S O_{4} a n d M g C l_{2}

respectively. The order of degree of hardness of these samples is

Four different water samples A, B, C and D each contains150 ppm of ${C a C l}_{2}$ , ${M g S O}_{4}$ , ${C a S O}_{4}$ , and ${M g C l}_{2}$ respectively.Choose the correct order of degree of hardness of these samples.

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