Which of these is a salt that does not cause hardness in watera Na 2 SO 4b Ca HCO 32c CaSO 4d MgSO 4

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Which of thes...

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Which of these is a salt that does not cause hardness in water
(a) Na₂SO₄
(b) Ca(HCO₃)₂
(c) CaSO₄
(d) MgSO₄

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24 mg

M g S O_{4}

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$C a C O_{3}$ does not dissolve in water, but in the presence of $C O_{2}$ it dissolves to form $^{'} X^{'}$

$^{'} X^{'}$ is

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