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Which of the following statements are correct?

Question:

Which of the following statements are correct?

(i) S–S bond is present in H2S2O6

(ii) In peroxosulphuric acid (H2SO5) sulphur is in +6 oxidation state.

(iii) Iron powder along with Al2O3 and K2O is used as a catalyst in the preparation of NH3

by Haber’s process.

(iv) Change in enthalpy is positive for the preparation of SO3

by catalytic oxidation of SO2

Solution:

Option (i) and (ii) are the answers.

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