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Q73) Which of the following properties of aluminium makes it useful for food packing [ AMU 1997]




SOLUTION


Answer: (d)


Q74) Electrolytic reduction of alumina to aluminium by Hall - Heroult process is carried ... [ iit SCREENING TEST2000]




SOLUTION


Answer: (c)


Q75) Which one is a non-metal in group 13(IIIA) .. [ AFMC 2003]



SOLUTION

Boron is the first member of the group 13 element it is non-metal
Answer:(a)



Q76) H3BO3 is .. [ IIT 2003]



SOLUTION

Boric acid (H3BO3) behaves as a Lewis acid and accepts OH- ions from water.It does not dissociate to produce H3O+ ions rather forms metaborate ion and in turn release H3O+ ions. B(OH)3 + H2O → [B(OH)4]- + H3O+ Hence boric acid is considered a monobaic and weak Lewis acid
Answer: (a)


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