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Q.

Which of following is correct option?

2Na + S $\to$ Na2S

2HgO $\to$ 2Hg + O2

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a

Decomposition reaction and combination reaction

b

Displacement reaction and combination reaction

c

Combination reaction and decomposition reaction

d

Combination reaction and redox reaction.

answer is B.

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Detailed Solution

detailed_solution_thumbnail

2Na + S

\to

Na2S
2HgO

\to

2Hg + O2
The above reactions are examples of combination reaction and decomposition reaction respectively.
The vital distinction between combination and decomposition reaction is that combination reaction involves a combination of reactants to give a single product. In contrast, the decomposition reaction involves the breakdown of a single compound into two or more products.
2Na + S

\to

Na2S is an example of a combination reaction because two reactants combine to give a single product. 2HgO

\to

2Hg + O2 is an example of a decomposition reaction because a single reactant is converted into two or more products.

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