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The reaction $\mathrm{NH_3(g) + HCl(g) \rightarrow NH_4Cl(s)}$ is classified as a combination reaction because it
Aproduces gas from a solid
Bforms a single product from two reactants
Cinvolves exchange of ions between two salts
Doccurs only in presence of electricity
Answer & Solution
Correct answer: B. forms a single product from two reactants
Ammonia and hydrogen chloride combine to form only one product, ammonium chloride. That is the defining feature of a combination reaction.
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