Explain the following : (i) The reaction between marble and dilute ...

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Explain the following :
(i) The reaction between marble and dilute \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is not used to prepare carbon dioxide.
(ii) Lime water becomes turbid on passing \( \mathrm{CO}_{2} \) though it, but becomes clear when more \( \mathrm{CO}_{2} \) is passed.
(iii) Alkaline earth metals have higher melting points than alkali metals.
(iv) Beryllium does not exhibit a covalency beyond 4.
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