31 Which of the following is not a Lewis base

(A)OH⁻

(B)H₂O

(C)SO₃

(D)Br⁻

(E)NH₃

32 Which of the following has the highest pKa value?(A)HClO(B)HClO₃(C)HClO₄(D)HBrO(E)HIO

33 What is the pH of an aqueous solution containing 0.12 M C₆H₅NH₂ (Kb=4.3×10⁻¹⁰) and 0.018 M C₆H₅NH₃Cl?(A)5.46(B)10.19(C)4.63(D)3.81(E)8.54

34 Which of the following is the strongest reducing agent?(A)Fe²⁺(B)Cr²⁺(C)F⁻(D)H₂(E)Co²⁺

35 A reaction that has a very low activation energy exhibits which of the following characteristics?(A)The rate is very sensitive to temperature.(B)The rate does not change significantly with temperature.(C)It must be second order.(D)It produces a curved Arrhenius plot.(E)It must be first order.

36 Which of the following statements regarding the effect of a catalyst on a reaction is not true?(A)A catalyst has no effect on the equilibrium composition of the reaction.(B)A catalyst provides a lower activation energy for the reaction.(C)When a reaction is catalyzed, both forward and reverse reactions are accelerated.(D)A catalyst speeds up a reaction by providing an alternate pathway for the reaction.(E)When a catalyst speeds up a reaction, the rate law remains the same.

37 The chemical formula for diborane is(A)BH₃(B)B₂H₆(C)B₂H₄(D)B₂H₂(E)B₂H

38 The geometry of PCl4⁺ is(A)T-shaped.(B)tetrahedral.(C)seesaw.(D)trigonal bipyramidal.(E)trigonal pyramidal.

39 Which of the following is considered unstable?(A)HFO(B)HBrO(C)HClO(D)HI(E)HF

40 Which of the following is not an example of a redox reaction?(A)3Mg+N₂→Mg₃N₂(B)2P³⁻+6H₂O→2PH₃+6OH⁻(C)2NaN₃→2Na+N₂(D)2NO+O₂→2NO₂(E)N₂H₄+O₂→N₂+2H₂O

41 How many unpaired electrons can be predicted for a tetrahedral iron(II) complex?(A)1(B)2(C)3(D)4(E)5

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