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) Theey are made passive by HNO_(3). (iii) Their carbides give acetylene on treatment with water. (iv) Their oxides are amphoteric.

Be and Al exhibit diagonal relationship. Which of the following statem

1.	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) Theey are made passive by HNO_(3). (iii) Their carbides give acetylene on treatment with water. (iv) Their oxides are amphoteric.
Answer» (iii) and (iv) (i) and (iii) (i) only (iii) only Solution :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)+3CH_(4)`