Be and Al exhibit diagonal relationship which of the following statements about them $$is/are$$ not true?(i) Both react with HCl to liberate $$H2(ii)$$ They are made passive by $$HNO3(iii)$$ Their carbides give acetylene on treatment with $$water(iv)$$ Their oxides are amphoteric

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"Be" and "Al" shows certain similarities due to diagonal relationshipBoth Be and Al reacts with HCl and liberates $$H2$$ gasBe $$+$$ $$2HCl$$ → $$BeCl2$$ $$+$$ $$H2$$↑$$2Al$$ $$+$$ $$6HCl$$ → $$2AlCl3$$ $$+$$ $$3H2$$↑→ Both "Be" and "Al" are resistant [Passive] to the action of con. $$HNO3$$ due to the formation of protective oxide layer on their surface →$$Be2C$$ $$+$$ $$4H2O$$ → $$2Be(OH)2$$ $$+$$ $$CH4Al4C3$$ $$+$$ $$12H2O$$ → $$4Al(OH)3$$ $$+$$ $$3CH4Both$$ beryllium and aluminium carbides on hydrolysis gives methane and they are called methanidesBoth the oxdies of Be and Al are amphoteric in nature, means they react with both acids as well as basesBeO $$+$$ $$2HCl$$ → $$BeCl2$$ $$+$$ $$H2O$$ : $$Al2O3$$ $$+$$ $$6HCl$$ → $$2AlCl3$$ $$+$$ $$3H2O$$

Be and Al exhibit diagonal relationship which of the following statements about them is/are not true?(i) Both react with HCl to liberate H2(ii) They are made passive by HNO3(iii) Their carbides give acetylene on treatment with water(iv) Their oxides are amphoteric

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