Sample Practice Paper For AIEEE (Chemistry)

1) The ionization enthalpy of hydrogen atom is 1.312 X 106 J mol-1. The energy required to excite the electron in the atom from n = 1 to n = 2 is
1 ) 6.56 X 105 J mol-1
2 ) 7.56 X 105 J mol-1
3 ) 9.84 X 105 J mol-1
4 ) 8.51 X 105 J mol-1

2) Which one of the following pairs of species have the same bond order?
1 ) CN- and CN+
2 ) O2- and CN-
3 ) NO+ and CN+
4 ) CN- and NO+

3) Which one of the following constitutes a group of the isoelectronic species?
1 ) NO+, C22- , CN-, N2
2 ) CN-, N2 , O22-, C22-
3 ) N2 , O2- , NO+ , CO
4 ) C22- , O2- , CO , NO

4) Four species are listed below:
i. HCO3-
ii. H3O+
iii. HSO4-
iv. HSO3F

Which one of the following is the correct sequence of their acid strength?
1 ) ii < iii < i < iv
2 ) i < iii < ii< iv
3 ) iii < i < iv < ii
4 ) iv < ii < iii < i

5) The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

1 ) 4.79
2 ) 7.01
3 ) 9.22
4 ) 9.58

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