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Which statement is wrong? (a) Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen (b) In ortho hydrogen spin of two nuclei is in same direction

 
Hydrogen
Last Post by Reyana09 3 years ago
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15/12/2021 11:53 am
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Palak23 
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An orange coloured solution acidified with H2SO4 and treated with a substance 'X' gives a blue coloured solution of CrO5. The substance 'X' is

(a) H2O2

(b) H2O

(c) dil HCl

(d) conc. HCl

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15/12/2021 12:11 pm
Reyana09 
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Correct answer: (a) H2O2

Explanation:

K2Cr2O7 an orange coloured solution, on acidification with dil H2SO4 is oxidised by H2O2 to blue peroxide of chromium, CrO5, which is unstable.

K2Cr2O7 + H2SO4 → K2SO4 + H2Cr2O7

[H2O2 → H2O + [O]] x 4

H2Cr2O7 + 4[O] → 2CrO5 + H2O

K2Cr2O7 + H2SO4 + 4H2O2 → 2CrO5 + K2SO4 + 5H2O

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