multiple choice from 21-31

Multiple Choice Identify the choice that best completes the statement or answers the question. 21. In the reaction 2HNO4) + Co + 2H 4) - 2NO + Cu + 2H, uy Which of the following statements is correct? a. HNO, is the reducing agent, and Cu is the oxidizing agent b. HNO, is the reducing agent, and Ht is the oxidizing agent e. Cu is the reducing agent, and is the oxidizing agent d. Cu is the reducing agent, and HNO, is the oxidizing agent c. H is the reducing agent, and Cu is the oxidizing agent 22. The oxidation number of chromium (Cr) in the dichromate ion (Cr,0,2-) is d. +7 b. +4 e. -2 a+2 0.6 c. 23. Manganese (Mn) has an oxidation number of +6 in a. Mno d. Mno; b. Men e. Mno, c. Mnol, 24. The oxidation number of sulfur (S) in Na SO, is a. +6 d. +2 b. +4 c. 0 c. +3 25. In which of the following compounds does manganese (Mn) have an oxidation number of +4? a. KM d. K MACI b. Mno, e. Mno, c. LiMno 26. In which of the following compounds does nitrogen have the highest oxidation number? a.NO, d. HNO, b. 1,0 c.NO c. NaNO, 27. The oxidation number of Cu in CuSO, is d. +4 b. +2 e. 0 c. +3 28. The oxidation number of fluorine () in Alf; is a.-3 d. 0 b. -2 e. + 1 c.-1 29. The oxidation number of oxygen in ozone, Oz, is a. +3 d. -2 b. -3 e. 0 c. +2 30. In the reaction 2MnOiler) +50,07 + 16H*ov) 2012 (22+ 100020 + 8,0 Which of the following statements is correct? a. hydrogen is oxidized and Co is the oxidizing agent b hydrogen is oxidized and MnO is the oxidizing agent carbon is oxidized and H" is the oxidizing agent manganese is oxidized and Co is the oxidizing agent e. carbon is oxidized and Mno, is the oxidizing agent 31. Which substance in the following reaction has undergone oxidation? 2MnOn(ap) +50,0p + 16H*1) 2MM2 * (p) + 1000219+8H,0m a. Mnoj d. Mnat e. Co d. b. C, 041 c. H