A. Positive electrode: carbon; negative electrode: zinc; electrolyte:manganese(IV) oxide
B. Positive electrode: carbon; negative electrode: zinc; electrolyte: ammoniumchloride
C. Positive electrode: zinc; negative electrode: carbon; electrolyte:manganese(IV) oxide
D. Positive electrode: zinc; negative electrode: carbon; electrolyte: ammoniumchloride 8)Which compound does iodine have oxidation state of +3?
A. HIO3
B. NaI3
C. CrI3
D. NaIO2 9)Which of the following pairs of substances are the oxidation numbers of sulphurand nitrogen the same?
A. sulphuric acid and nitric acid
B. H2SO3 and NO2
C. Na2S and NO
D. FeS and NH4Cl
10) In which of the following reaction does nitrogen have the greates change inoxidation number?
A. N2 + 3H2 --> 2NH3
B. 4NH3 + 5O2 --> 4NO + 6H2O
C. 2NO + O2 --> 2NO2
D. 3NO2 + H2O --> 2HNO3 + NO 11)For the following reaction, which of the following is correct?
9H2SO4 + 8KI --> H2S + 8KHSO4 + 4H2O + 4I2
A. Species being reduced: H2S; species being oxidized: I2
B. Species being reduced: I2; species being oxidized: H2S
C. Species being reduced: H2SO4; species being oxidized: KI
D. Species being reduced: KI; species being oxidized: H2SO4
12) Which of the following reactant in bracket is NOT a reducing agent?
A. PbO + [CO] --> Pb + CO2
B. [Zn] + 2Ag+ --> Zn2+ + 2Ag
C. Br2 + 2[I-] --> 2Br- + I2
D. [SO2] + H2O --> H2SO3
13) Which of the following are redox reaction?
(i) Li + H2O --> LiOH + H2
(ii) Ag + PtCl4 --> AgCl +Pt
(iii) HClO4 + Ca(OH)2 --> H2O + Ca(ClO)2
14) For the equation
w Zn + x ReO- + y H+ --> w Zn2+ + x Re + z H2O
A. w=4, x=1, y=8 and z=16
B. w=4, x=2, y=16 and z=8
C. w=7, x=2, y=16 and z=8
D. w=7, x=1, y=8 and z=16
15) Which of the substances will react with ammonium iodide?
(i) warm NaOH solution
(ii) aqueous bromine
(iii) silver nitrate solution
A. i and ii
B. i and iii
C. ii and iii
D. i, ii and ii
更新1:
其實我係想對答案, 我的答案: B,D,B,A,C,D,A,C,D