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Q1) Alum is used by dyers of cloths .. [ CPMT 1981]




SOLUTION


Answer: (d)


Q2) The purification method of bauxite containing iron oxide as impurity is known as .. [ Kerala PMT 1998]




SOLUTION


Answer: (b)


Q3) An example of double salt is .. [ CBSE PMT 1989]



SOLUTION

Potash Alum K2SO4 . Al2(SO4)3 . 24 H2O is a double salt
Answer:(d)



Q4) Which is true for an element R present in group 13 of period table



SOLUTION


Answer: (c)


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