The paramagnetic species is

• KO₂

• SiO₂

• TiO₂

• BaO₂

The ion which is not tetrahedral in shape is

• BF₄^-

• NH₄⁺

• Cu(NH₃)₄²⁺

• NiCl₄^2-

MnO${}_4^{2-}$ (1 mole) in neutral aqueous medium is disproportionated to

• 2/3 mole of MnO${}_4^{-}$ and 1/3 mole of MnO₂

• 1/3 mole of MnO${}_4^{-}$ and 2/3 mole of MnO₂

• 1/3 mole of Mn₂O₇ and 1/3 mole of MnO₂

• 2/3 mole of Mn₂O₇ and 1/3 mole of MnO₂

4.

Among the following the strongest acid is

• CH₃COOH

• C₆H₅COOH

• m-CH₃OC₆H₄COOH

• p-CH₃OC₆H₄COOH

Among the following the weakest base is

• C₆H₅CH₂NH₂

• C₆H₅CH₂NHCH₃

• O₂NCH₂NH₂

• CH₃NHCHO

Intermolecular hydrogen bonding is strongest in

• methylamine

• phenol

• formaldehyde

• methanol

Which of the following are arranged in the decreasing order of dipole moment?

• CH₃Cl, CH₃Br, CH₃F

• CH₃Br, CH₃Cl, CH₃F

• CH₃Cl, CH₃Br, CH₃F

• CH₃Br, CH₃F, CH₃Cl

Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy?

• Toluene

• Benzene

• n-Pentane

• 2,2-Dimethylpropane

One gram sample of NH₄NO₃ is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K. The heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition for NH₄NO₃ ?

• -7.53 kJ/mol

• -398.1 kJ/mol

• -16.1 kJ/mol

• -602 kJ/mol

Which one of the following has $∆$S° greater than zero?

• CaO_(s) + CO_2(g) $\rightleftharpoons$ CaCO_3(s)

• NaCl_(aq) $\rightleftharpoons$NaCl_(s)

• NaNO_3(s) $\rightleftharpoons$ Na⁺_(aq) + NO₃^-_(aq)

• N_2(g) + 3H_2(g) $\rightleftharpoons$ 2NH_3(g)