In which of the following formation, contraction occurs
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In which of the following formation, contraction occurs

In which of the following formation, contraction occurs
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In which of the following formation, contraction occurs :

(a) H₂O from H₂ and O2 g

(b) CO2 from CO

(c) CO₂ from carbon

(d) CuO (s) from Cu(s) and N2O(g)

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ANSWER : Here, the correct answer of this question will be option (a, b).

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