Question

Select the correct statements i) Excess of Na2S2O3 reacts with aqueous CuSO4 to give Na4[Cu6(S2O3)5] ii) − 4MnO has the strongest and weakest oxidizing power in acidic and neutral medium iii) [CuCl4]3− and [Cu(NH3)4]Cl are colourless and diamagnetic iv) If the magnetic moment of an ion is 6 2 B.M., the ion may be Co+3
A) i, iii, iv B) ii, iii, iv C) i, ii, iii, iv D) ii, iv

Answer 1

Answer:

Let us Understand the Reaction of the process:

2CuSO4+4KI → Cu2I2+2K2SO4+I2

This liberated I2,

is titrated with Na2S2O3.

The reaction is given below:

I2+2Na2S2O 3→ Na2S4O6+2Nal

So, liberated I2 is reduced and Na2S2O3 is oxidized.

So, the correct answer is C