JEE Main 2022 · 26 Jun · Shift 2 · Chemistry Q65

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ChemistrySingle correct+4 / -1Question 65 of 90

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

\mathrm{CaCO_3}

and

\mathrm{Mg(OH)_2}

\mathrm{CaCO_3}

and

\mathrm{MgCO_3}

\mathrm{Ca(OH)_2}

and

\mathrm{MgCO_3}

\mathrm{Ca(OH)_2}

and

\mathrm{Mg(OH)_2}

Answer and worked solution

Official answer: A

Boiling. $\mathrm{Ca(HCO_3)_2\rightarrow CaCO_3\downarrow+H_2O+CO_2}$ and $\mathrm{Mg(HCO_3)_2\rightarrow Mg(OH)_2\downarrow+2CO_2}$ ( $\mathrm{Mg(OH)_2}$ is less soluble than $\mathrm{MgCO_3}$ ).

(A)

Topics:Water and hydrogen peroxide

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JEE Main 2022 · 26 Jun · Shift 2, Chemistry question 65