/5 Chemistry Chapter 7 : Test Yourself 1 / 5 In which of the following changes, the nitrogen atom is reduced? A) N₂ to NO₂ B) N₂ to NH₃ C) N₂ to NO D) N₂ to HNO₃ Reasoning: Reduction means gain of electrons / decrease in oxidation state. In NH₃, nitrogen has a lower oxidation state than in N₂ ⟹ so it is reduced. 2 / 5 Which of the following changes reaction is an example of oxidation? A) Silver atoms to silver (I) ion B) Oxygen molecule to oxide ion C) Iron (III) ion to iron (II) ion D) Chlorine molecule to chloride ion Reasoning: Oxidation means loss of electrons / increase in oxidation state. Ag ⟹ Ag⁺ shows loss of electron ⟹ oxidation. 3 / 5 Which of the following elements in the given reaction is reduced? A) Zn B) H₂ C) O D) ZnO Reasoning: Zn in ZnO goes from +2 to 0 (Zn) ⟹ gain of electrons = reduction 4 / 5 Consider the following reaction: A) Oxidizing agent B) Catalyst C) Reducing agent D) Electrolyte Reasoning: H₂S loses hydrogen / sulfur oxidation increases ⟹ it reduces Cl₂ to HCl, so H₂S is a reducing agent. 5 / 5 The oxidation state of Cr in K₂Cr₂O₇ is: A) + 12 B) - 6 C) + 6 D) + 3 Reasoning: ● K=+ 1 (2 atoms ⟹ + 2)● O=- 2 (7 atoms ⟹ - 14)Let, Cr=x ⟹ 2(+1)+2x+7(-2)=02+2x-14=0 ⟹ 2x=12 ⟹ x=+ 6 Your score is 0% Restart quiz
