1) Which of the following reactions involves oxidation & reduction a) HBr + AgNO3 → AgBr + HNO3 b) NaBr + HCl → NaCl + HBr c) Na2O + H2SO4 → Na2SO4 + H2O d) H2 + Br2 → 2HBr 2) The number of electrons to balance the equation: NO3- + 4H+ + ne- → NO + 2H2O a) 2 b) 1 c) 8 d) 3 e) 10 f) 5 3) In the balanced the equation in acidic medium: MnO4- + Cl- + H+ → Mn+2 + Cl2 + H2O , the coefficient of Cl- is: a) 2 b) 1 c) 8 d) 4 e) 10 f) 5 4) In the reaction Cl2 + OH- → Cl- + ClO3- +H2O , chlorine is   a) Oxidized. b) Reduced c) oxidized as well as reduced d) neither oxidized nor reduced 5) The oxidation number of carbon in CH2O is a) -2 b) +2 c) 0 d) +4 6) Identify the incorrect statement a) oxidation number of oxygen (O) is -2 in most of its compounds. b) oxidation number of oxygen (O) 1/2 in superoxide's. c) oxidation number of oxygen (O) -1 in peroxides. d) oxidation number of oxygen (O) +2 in OF2. 7) Which of the following metals exhibit more than one oxidation state a) K b) Li c) Fe d) Al e) Na f) Mg 8) In the reaction: 3OCl- → 2Cl- + ClO3- , (OCl-) act as a) Reducing agent b) oxidizing agent c) both A & B d) neither oxidizing nor Reducing agent 9) In which of the following conversion (reactions) , chlorine is oxidized a) I2 + Cl2 → 2ICl  b) OCl- → Cl- c) OCl- → ClO2 d) Cl2 → OCl- 10) oxidizing agent are always oxidized & reducing agent are always reduced a) True b) False 11) Oxidation state: describes the degree of oxidation (loss or gain of electrons) of an atom in a chemical compound. Conceptually, the oxidation state may be positive, negative or zero. a) True b) False 12) )In the following reaction S−2 gets Reduces to S8 ( 16H2S+8SO2→3S8+16H2O   a) True b) False

Oxidation Reduction Reaction

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