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Q57) Aluminium reacts with caustic soda to form? [ MP PMT 1995]




SOLUTION

2Al + 2NaOH → 2NaAlO2 +2H2
Answer: (a)


Q58) Which of the following is electron deficient? [ CBSE PMT 2000]




SOLUTION

B in BCl3 have six electrons , still 2 electrons short
Answer: (b)


Q59) A layer of coke is spread over bauxite during extraction of aluminium. this acts as a/an .. [ Manipal PMT 2002]



SOLUTION


Answer:(d)



Q60) An example of alum is



SOLUTION

Pure Alum have formula M2SO4 . M'2 (SO4)3 . 24H2O
Where M = monovalent metal, M' = trivalent metal
Answer: (c)


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