First slide

Uses of Boron & Aluminium

Question

Regarding 13th group elements and their compounds some statements are given below. False statement among the following is

Easy

A

B–10 is used in Nuclear reactors to absorb neutrons
B

Weight to weight basis aluminium is a better conductor than copper.
C

Orthboric acid on heating to red hot conditions gives metaboric acid
D

Diborane is a potential rocket fuel.

Solution

$(3) H_{3} {BO}_{3} \overset{100^{0} C}{\to} {HBO}_{2} \overset{160^{0} C}{\to} H_{4} B_{2} O_{7} \overset{Red hot}{\to} B_{2} O_{3} (4) B_{2} H_{6} + 3 O_{2} \overset{}{\to} B_{2} O_{3} + 3 H_{2} O; ΔH = - 1976 kJ$
Due to very high enthalpy of combustion and very high calorific value it is a potential rocket fuel. Thus 1,2 and 4 are true statements

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