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In a water sample, the concentrations of $Ca^{2+}, Mg^{2+}$ and $\text{HCO}_{3}^{-}$ are $100$ $\text{mg/L}$, $36$ $\text{mg/L}$ and $122$ $\text{mg/L}$, respectively. The atomic masses of various elements are: $Ca = 40, Mg = 24, H = 1, C = 12, O = 6$.

The total hardness and the temporary hardness in the water sample (in $\text{mg/L}$ as $\text{CaCO}_{3}$) will be

  1. $400$ and $100$, respectively.
  2. $400$ and $300$, respectively.
  3. $500$ and $100$, respectively.
  4. $800$ and $200$, respectively.
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