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Q65) Aluminium (III) chloride forms a dimer because? [ CBSE PMT 1995]




SOLUTION

By forming a dimer A2Cl6 aluminium achieves a coordination number of 4
Answer: (a)


Q66) Aluminium chloride is a /an .. [ KCET 2000]




SOLUTION

Al in AlCl3 is electron deficient. Hence acts as Lewis acid
Answer: (c)


Q67) Alum helps in purifying water by [ AIEEE 2002]



SOLUTION


Answer:(c)



Q68) On addition of mineral acid to an aqueous solution of borax, the following compound is formed.. [ Roorkee Screening test 1992]



SOLUTION

Na2B4O7 + 2HCl +5H2O → 2NaCl + 4H3BO3 ( orthoboric acid)
Answer: (b)


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