KVPY SB SX Exam 2011 Question Paper

Question : 102 of 120

Marks: +1, -0

MnO^{-}_4

oxidizes (i) oxalate ion in acidic medium at 333 K and (ii) HCl. For balanced chemical equations, the ratios

[MnO_4^{-} : C_2O_4^{2-}]

in (i) and

[MnO_4^{-} : HCI]

in (ii). respectively, are

Solution:

16H^{+} + 2MnO_4^{–} + 5C_2O_4^{2–}

→ 2Mn^{+2} + 10CO_2 + 8H_2O

MnO_4^{–} : C_2O_4^{2–} = 2 : 5

2KMnO_4 + 16 HCl

→ 2KCl + 2MnCl_2

+ 5Cl_2 + 8H_2O

MnO_4^{–} : HCl

= 2 : 16 = 1 : 8

Go to Question:

Prev Question

Next Question