Concepts of acids and bases

7.Among the compounds A-D, those which hydrolyse easily are

 (a) NCl3

(b) NF3

(c) BiCl3

(d) PCl3


8.The reaction of FeCl3.6H2O with SOCl2yields.

(a) FeCl2(s), SO2(g) and HCl (g)

(b) FeCl3(s), SO2(g) and HCl(l)

(c) FeCl2(s), SO3(s) and HCl (g)

(d) FeCl3(s), SO2(g) and HCl(g)


9.Among the following, the correct acid strength trend is represented by

 (a) [Al(H2O)6]3+<[Fe(H2O)6]3+<[Fe(H2O)6]2+

(b) [Fe(H2O)6]3+<[Al(H2O)6]3+<[Fe(H2O)6]2+

(c) [Fe(H2O)6]2+<[Fe(H2O)6]3+<[Al(H2O)6]3+

(d) [Fe(H2O)6]2+<[Al(H2O)6]3+<[Fe(H2O)6]3+


10.Among the following, an example of a hypervalent species is

(a) BF3.OEt2

(b) SF4

(c) [PF6]

(d) Sb2S3


11.Two tautomeric forms of phosphorus acid are



12.Xenon forms several fluorides and oxofluorides which exihibit acidic behaviour. The correct sequence of descending Lewis acidity among the given species is represented by

 (a) XeF6> XeOF4> XeF4> XeO2F2

(b) XeOF4 > XeO2F2> XeOF4 > XeF6

(c) XeF4> XeO2F2> XeOF4> XeF6

(d) XeF4 > XeF6> XeOF4> XeO2F2


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