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91. When metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl to form compound (C).
The compound (A) when heated strongly gives (D) which is used to extract metal. Identify (X), (A), (B), (C) and (D). Write suitable equations to support their identities.

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92.

Aluminium trifluoride is insoluble in anhydrous HF but dissolves on the addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous BF₃is bubbled through. Give reasons.

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93.

Discuss similarities in properties among the group 13 elements.

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94.

Boron exhibits anomalous behaviour in the company of other members of group 13. Explain.

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95.

Discuss the diagonal relationship of boron with silicon.

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Short Answer Type

96.

In some of the reactions, thallium resembles aluminium whereas in others it resembles with group 1 metals. Support this statement by giving some evidences.

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97.

What are borones(boron hybrides)?

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98.
What is the action of:
(a) H₂O (b) LiH on B₂H₆?

(a) Action with water: Diborane is readily hydrolysed by water liberating H₂ gas.

(b) Action with LiH: Diborane reacts with Lithium hydride in diethyl ether forming lithium borohydride.

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99.

Write balanced equations for:
$straight B subscript 2 straight H subscript 6 space plus space straight H subscript 2 straight O space space rightwards arrow$