Tiêu đề REDOX REACTIONS Q-7.pdf ✅

CLASS : XIIth SUBJECT : CHEMISTRY DATE : DPP NO. : 7 1. Bleaching action of SO2 is due to : a) Reduction b)Oxidation c) Hydrolysis d)Acidic nature 2. In N2 +2H2O ⟶NH+ 4 + NO― 2 ; N is : a) Oxidised b)Reduced c) Both (a) and (b) d)None of these 3. If three electrons are lost by a metal ion M3+, its final oxidation number will be : a) Zero b)+6 c) +2 d)+4 4. In the reaction, NaH + H2O ⟶NaOH + H2 : a)H ― is oxidised b)Na + is reduced c) Both NaH and H2O are reduced d)None of the above 5. Which of the following acts as an oxidizing agent? a)HNO3 b)Cl2 c) FeCl3 d)All of these 6. How many gram of I2 are present in a solution which requires 40 mL, of 0.11 N Na2S2O3 to react with it, S2O 2― 3 + I2 ⟶S4O 2― 6 +2I ―? a) 12.7 g b)0.558 g c) 25.4 g d)11.4 g 7. The number of mole of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is : a) 2/5 b)3/5 c) 4/5 d)1 8. What weight of HNO3 is required to make 1 litre of 2 N solution to be used as an oxidising agent in the reaction? 3Cu + 8HNO3⟶3Cu(NO3 )2 +2NO + 4H2O a) 63 g b)21 g c) 42 g d)84 g 9. The oxidation state of two sulphur atoms in H2S2O8 a) ―6 b) ―2 c) +6 d) ―4 10. In a conjugate pair of reductant and oxidant, the oxidant has : a)Higher ox.no. b)Lower ox.no. c) Same ox.no. d)Either of these Topic :-REDOX REACTIONS