Trying to find the right answer to this..

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

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.

310 Views

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.

184 Views

93.

Discuss similarities in properties among the group 13 elements.

162 Views

94.

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

171 Views

95.

Discuss the diagonal relationship of boron with silicon.

729 Views

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.

Thallium resembles aluminium:

(i) Al shows a uniform oxidation state of + 3 and Tl also shows +3 oxidation states in its certain compounds such as TlCl₃, Tl₂O₃ etc.

(ii) Both Al and Tl form octahedral complexes [AlF₆]^3– and [TlF₆]^3– respectively.

Thallium resembles group 1 metals:

(i) Thallium (Tl) and group 1 metals show an oxidation state of + 1. Thallium shows an oxidation state of + 1 due to inert pair effect in some of its compounds like Tl₂O, TICl₆ TIClO₄ etc.

(ii) Like group 1 oxides, Tl₂O is strongly basic.

246 Views

97.

What are borones(boron hybrides)?

178 Views

98.

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

156 Views

99.

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