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Which of the following are combination reactions? - Science

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Question

Which of the following are combination reactions?

  1. `2"KClO"_3 overset("Heat")(->) 2"KCl" + 3"O"_2`
  2. `"MgO" + "H"_2"O" -> "Mg"("OH")_2`
  3. `4"Al" + 3"O"_2 -> 2"Al"_2"O"_3`
  4. `"Zn" + "FeSO"_4 -> "ZnSO"_4 + "Fe"`

Options

  • (i) and (iii)

  • (iii) and (iv)

  • (ii) and (iv)

  • (ii) and (iii)

MCQ

Solution

(ii) and (iii)

Explanation - 

Both the reactions (ii) and (iii) are the examples of combination reactions.

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Chapter 1: Chemical Reactions and Equations - Exemplar [Page 4]

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NCERT Exemplar Science [English] Class 10
Chapter 1 Chemical Reactions and Equations
Exemplar | Q 18 | Page 4
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