$B e$ and $A l$ exhibit a diagonal relationship. Which of the following statements about them is/are not true?
(i) Both react with HCI to liberate $H_{2}$ .
(ii) They are made passive by $H N O_{3}$ .
(iii) Their carbides give acetylene on treatment with water.
(iv) Their oxides are amphoteric.

(iii) and (iv)

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(i) and (iii)

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(i) only

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(iii) only

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Solution

The correct option is D (iii) only
The carbides of both Be and Al liberate methane with water.
$B e_{2} C + 2 H_{2} O \to 2 B e O + C H_{4}$
$A l_{4} C_{3} + 6 H_{2} O \to 2 A l_{2} O_{3} + 3 C H_{4}$

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Similar questions

Be and Al exhibit diagonal relationship. Which of the following statement/s about them is/are false?
1. Both react with HCl to liberate $H_{2}$
2. They are made passive by $H N O_{3}$
3. Their carbides give acetylene on treatment with water.
4. Their oxides are amphoteric.

Question 17
Which of the following statements are true about unisexual flowers?

(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross-pollination
(iv) Unisexual flowers possessing only stamens cannot produce fruits

(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (iii) and (iv)
(d) (i), (iii) and (iv)