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# The hardness of a water sample containing $$10^{-3}$$M $$MgSO_4$$ expressed as $$CaCO_3$$ equivalents (in ppm) is ________. [molar mass of $$MgSO_4$$ is $$120.37$$ g/mol]

A
100
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#### Correct option is A. 100$$10^{-3}$$ molar $$MgSO_4 = 10^{-3}$$ moles of $$MgSO_4$$ present in $$1$$ Litre.$$n_{CaCO_3} =n_{MgSO_4}$$$$PPM$$ (in term of $$CaCO_3) = \dfrac{10^{-3}\times 100}{1000} \times 10^6$$ $$= 100\ ppm$$

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Q1
The hardness of a water sample containing $$10^{-3}$$M $$MgSO_4$$ expressed as $$CaCO_3$$ equivalents (in ppm) is ________.

[molar mass of $$MgSO_4$$ is $$120.37$$ g/mol]
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Q2

The hardness of a water sample containing ${10}^{-3}\mathrm{M}{\mathrm{MgSO}}_{4}$ expressed as ${\mathrm{CaCO}}_{3}$ equivalents (in ppm)is (molar mass of ${\mathrm{MgSO}}_{4}$is $120.37$$\mathrm{g}/\mathrm{mol}$)

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Q3
The hardness of a water sample (in terms of equivalents of CaCO3 ) containing 103 M CaSO4 is :
(molar mass of CaSO4=136 g mol1)
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Q4
The hardness of a water sample (in terms of equivalents of CaCO3) containing 103M CaSO4 is:

[Molar mass of CaSO4=136 g mol1].

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Q5
If a sample of water contains 30 ppm of MgSO4, then its hardness is :
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