Redox reactions
Redox reactions is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2020, 2022). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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खालीलपैकी कोणत्या रासायनिक अभिक्रिया ऑक्सिडिकरण-क्षपण या प्रकारात मोडतात ? (a) 2Mg + O2 → 2MgO (b) MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 (c) 2Na + Cl2 → 2NaCl (d) 2NaBr + H2O2 → 2NaOH + Br2 Which of the following are Oxidation-reduction reactions ? (a) 2Mg + O2 → 2MgO (b) MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 (c) 2Na + Cl2 → 2NaCl (d) 2NaBr + H2O2 → 2NaOH + Br2
(a)2Mg + O2 → 2MgO
(b)MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
(c)2Na + Cl2 → 2NaCl
(d)2NaBr + H2O2 → 2NaOH + Br2
All given chemical reactions involve simultaneous oxidation and reduction (redox reactions) where electrons or oxygen/hydrogen are transferred.
V2O7⁴⁻ मध्ये V ची ऑक्सिडीकरण स्थिती ही ______ आहे. The oxidation state of V in V2O7⁴⁻ is _______
In V2O7⁴⁻, let the oxidation state of V be x. Therefore, 2(x) + 7(-2) = -4, which gives 2x - 14 = -4, so 2x = +10, and x = +5.