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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

  

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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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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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