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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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15/12/2021 11:53 am

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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

(d) conc. HCl

Palak23

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15/12/2021 12:11 pm

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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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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