Identify the correct statements from the following.
I. All alkaline earth metals give hydrides on heating with hydrogen.
II. Calcium hydroxide is used to purify sugar.
III. $\mathrm{BeCl}_2$ is a dimer in gaseous phase.Select the correct statements from the following
(A) Aluminium liberates $\mathrm{H}_2$ gas with dil. HCl but not with aqueous NaOH .
(B) Formula of sodium metaborate is $\mathrm{Na}_3 \mathrm{BO}_3$.
(C) Boric acid is a weak monobasic acid.
(D) For thallium, +1 state is more stable than +3 state.
The number of amphoteric oxides from the following is $\mathrm{CO}_2, \mathrm{GeO}_2, \mathrm{SnO}_2, \mathrm{PbO}_2$, $\mathrm{CO}, \mathrm{GeO}, \mathrm{SnO}, \mathrm{PbO}$
Which of the following statements is not correct?
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