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Be and Al exhibit diagonal relationship ...

Be and Al exhibit diagonal relationship . Which of the following statements about them is/are not true ?
(i) Both react with HCl to liberate `H_2`.
(ii) They are made passive by `HNO_3`.
(iii) Their carbides give acetylene on treatment with water .
(iv) Their oxides are amphoteric .

A

(III) and (IV)

B

(I) and (III)

C

(I) only

D

(III) only

Text Solution

Verified by Experts

The correct Answer is:
D
The carbides of both Be and Al liberate methane with water.
`Be_(2)C+ 2H_(2)O to 2BeO +CH_(4)`
`Al_(4)C_(3) +6H_(2)O to 2Al_(2) O_(3) +3 CH_(4)`
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