AIEEE 2008 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

A)    6.56 X 10⁵ J mol^-1

B)    7.56 X 10⁵ J mol^-1

C)    9.84 X 10⁵ J mol^-1

D)    8.51 X 10⁵ J mol^-1 

2)     Which one of the following pairs of species have the same bond order?

A)    CN^- and CN⁺

B)    O₂^- and CN^-

C)    NO⁺ and CN⁺

D)    CN^- and NO⁺ 

3)     Which one of the following constitutes a group of the isoelectronic species?

A)   NO⁺, C₂^2- , CN^-, N₂

B)   CN^-, N₂, O₂^2-, C₂^2-

C)   N₂, O₂^- , NO⁺ , CO

D)   C₂^2-, 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?

A)   ii < iii < i < iv

B)   i < iii < ii< iv

C)   iii < i < iv < ii

D)   iv < ii < iii < i 

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

A)   4.79

B)   7.01

C)   9.22

D)   9.58

6)     The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

A)   -SO₃H , -COOH , -CONH₂ , -CHO

B)   -CHO , -COOH , -SO₃H , -CONH₂

C)   -CONH₂ , -CHO , -SO₃H , -COOH

D)   -COOH, -SO₃H, -CONH₂, -CHO

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