Q.

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

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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.

answer is C.

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Detailed Solution

3 H3BO3  →1000C  HBO2  →1600C  H4B2O7  →Red  hot  B2O3 (4) B2H6  +  3O2  → B2O3  +  3H2O  ;    ΔH=−1976  kJDue 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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