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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. remaining are COMBINATION of MOLECULES |
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