Group 13 Elements: the Boron Family

Author:Haryana Board
11th Haryana Board
IMPORTANT

Group 13 Elements: the Boron Family: Overview

The topic discusses the atomic, chemical and physical properties of the group 13 elements. It covers the electronic configuration, ionization enthalpy, reactivity towards the air among the properties and uses of the elements of the boron family.

Important Questions on Group 13 Elements: the Boron Family

MEDIUM
IMPORTANT

Aluminium trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous BF3 is bubbled through. Give reasons.

MEDIUM
IMPORTANT

If BCl bond has a dipole moment, explain why BCl3 molecule has zero dipole moment.

EASY
IMPORTANT

Write balanced equations for: Al + NaOH 

MEDIUM
IMPORTANT

Consider the compounds, BCl3 and CCl4. How will they behave with water? Justify.

MEDIUM
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Explain the following reaction when hydrated alumina is treated with aqueous NaOH solution.

EASY
IMPORTANT

What happens when aluminium is treated with dilute NaOH?

MEDIUM
IMPORTANT

Discuss the pattern of variation in the oxidation states of C to Pb.
 

MEDIUM
IMPORTANT

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.

MEDIUM
IMPORTANT

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

EASY
IMPORTANT

Give the reason, why a mixture of dilute NaOH and aluminium pieces is used to open drain.

EASY
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Give the reason why conc. HNO3 can be transported in aluminium container.

MEDIUM
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Write reactions to justify the amphoteric nature of aluminium.

MEDIUM
IMPORTANT

How can you explain the higher stability of BCl3 as compared to TlCl3?

MEDIUM
IMPORTANT

Discuss the pattern of variation in the oxidation states of B  to Tl .