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

"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

"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

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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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(iii) and (iv)

(i) and (iii)

(i) only

(iii) only

answer is D.

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Detailed Solution

"Be" and "Al" shows certain similarities due to diagonal relationship
Both Be and Al reacts with HCl and liberates H₂ gas
Be + 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 + CH₄
Al₄C₃ + 12H₂O → 4Al(OH)₃ + 3CH₄
Both beryllium and aluminium carbides on hydrolysis gives methane and they are called methanides
Both the oxdies of Be and Al are amphoteric in nature, means they react with both acids as well as bases
BeO + 2HCl → BeCl₂ + H₂O : Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O