1.

Which of the following involves combination of two elements ?(a) N2(g) + 3H2(g) + 2NH3(g)(b) CaO(s) + CO2(g) - CaCO3(g)(c) 2502(g) + O2(g) → 2503f(g)(d) NH3(g) + HCl(g) - NH4Cl(s)​

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ANSWER:

OPTION a is RIGHT ........



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