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In which of the following reactions heterogenous catalysis is involved?

(a) 2SO2 (g) + O2 (g) +NO(g)→ 2SO3 (g)

(b) 2SO2 (g) +Pt(s)→ 2SO3 (g)

(c) N2 (g) + 3H2 (g) +Fe(s)→ 2NH3 (g)

(d) CH3COOCH3 (l) + H2O (l) +HCl(l)→ CH3COOH (aq) + CH3OH (aq)

(i) (b), (c)

(ii) (b), (c), (d)

(iii) (a), (b), (c)

(iv) (d)

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Correct answer is (i) (b), (c)

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