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Q25) Which metal is protected by a layer of its own oxide? [ DPMT 1983]




SOLUTION


Answer: (a)


Q26) Which of the following statements is not true both for B and Al? [ Pb CET sample paper 1988]




SOLUTION

Boron does not reacts with HCl, but Al do
Answer: (d)


Q27) Al2O3 formation involves evolution of a large quantity of heat which makes its use in ... [ MPPMT 1990]



SOLUTION


Answer:(d)



Q28) Which is used in high temperature thermometry? [ MP PMT 1993]



SOLUTION

Ga remains liquid over a temperature range of 300 K to 2500 K)
Answer: (b)


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