On balancing the given redox reaction, − − + + + → + − + + the coefficients a, b and c are found to — NEET Chemistry Past Papers Chemistry Question
Question
On balancing the given redox reaction, − − + + + → + − + + the coefficients a, b and c are found to be, respectively - (A) 3, 8, 1 (B) 1, 8, 3 (C) 8, 1, 3 (D) 1, 3, 8
💡 Solution & Explanation
Reaction has to be balanced in acidic medium 'O' atoms are balanced by adding H2O and then H-atom is balanced by adding H+ ions and charge is balanced by e. Oxidation: 2 2 3 2 4 SO H O SO 2H 2e ] 3 − − + + → + + Reduction: 2 3 2 7 2 Cr O 14H 6e 2Cr 7H O − + + + + → + 2 2 3 2 2 7 3 4 2 Cr O 3SO 8H 2Cr 3SO 4H O − − + − + + → + + a = 1 b = 3 c = 8 100. Identify the final product [D] obtained in the following sequence of reactions. + ⎯⎯⎯⎯→ ⎯⎯⎯⎯ → 4 2 4 3 i) LiAlH H SO 3 ii) H O CH CHO [A] [B] ⎯⎯⎯⎯→ [D] Na/dry ether Br (1) (2) C4H10 (3) HC C Na+ (4) Ans. (4) Sol. CH3–CH= O LiAlH4 H3O + CH3–CH2–OH H