Select the correct statement about water.
$(i)$ Critical temperature of $H_2O$ is less than $NH_3$.
$(ii)$ Standard boiling point of water is $100 \ ^oC$.
$(iii)$ Critical volume of $H_2O$ is less than $NH_3$.

  • A
    Only $(ii)$
  • B
    Only $(ii), (iii)$
  • C
    Only $(iii)$
  • D
    $(i), (ii), (iii)$

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Which process is used for the removal of hardness of water?

Match the reactants in List-$I$ with the products in List-$II$.
List-$I$List-$II$
$(a). H_2O + H_2S$$(i). (H_3O^{+}, HS^{-})$
$(b). H_2O + N^{3-}$$(ii). (NH_3, OH^{-})$
$(c). H_2O + SiCl_4$$(iii). (OH^{-}, H_3S^{+})$
$(d). H_2O + F_2$$(iv). (SiO_2, HCl)$
$(v). (SiO_4^{4-}, Cl_2)$
$(vi). (O_2, F^{-})$
$(vii). (HF, OH^{-})$
$(viii). (OH^{-}, NH_3)$

The substance used as a universal solvent is .....

Which one of the following is used for reviving the exhausted permutite?

Difficult
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Deionized water is obtained by passing hard water through

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