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Question

Read the following statements and choose the correct option:
Statement 1: Burning of magnesium ribbon is an exothermic reaction.
Statement 2: Decomposition of potassium nitrate is an endothermic reaction.

A
Statement 1 is correct and statement 2 is wrong.
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B
Statement 1 is wrong and statement 2 is correct.
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C
Both statements are correct.
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D
Both statements are wrong.
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Solution

The correct option is C Both statements are correct.
Burning of magnesium ribbon is exothermic in nature as heat and light are produced during this reaction. The reaction occurs as follows:
2Mg (s)+O2(g)2MgO (s)+Heat

The decomposition of potassium nitrate is an endothermic reaction as heat is absorbed in this reaction. The reaction occurs as follows:
2KNO3(s)Heat2KNO2(s)+O2(g)

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