Chemistry · 2019
JEE Main · 12 January 2019, Shift 1 · Q43
The hardness of a water sample (in terms of equivalents of CaCO_3 ) containing 10^-3 M CaSO_4 is: (molar mass of CaSO_4=136 g mol^-1 )
The hardness of a water sample (in terms of equivalents of $\displaystyle \mathrm{CaCO}_3$ ) containing $\displaystyle 10^{-3} \mathrm{M} \mathrm{CaSO}_4$ is :
(molar mass of $\displaystyle \mathrm{CaSO}_4=136 \mathrm{~g} \mathrm{~mol}^{-1}$ )
Official answer
(2)
$\displaystyle 100$ ppm
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