Analyse the following reactions and answer the questions given below.
A) Magnesium + Hydrochloric acid→ Magnesium Chloride+Hydrogen+Heat
B) Potassium Permanganate + Heat→
Potassium Manganate + Manganese Dioxide+Oxygen
a) What are the reactants used in reaction A?
b) Which one of the above reactions is endothermic?
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Answer:
1 redox reaction
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g). The reaction is a redox reaction.
2 Solid potassium permanganate decomposes when heated: 2 KMnO4 → K2MnO4 + MnO2(s) + O. Here, the oxidation state of manganese changes as the potassium permanganate (oxidation state +7) decomposes to potassium manganate (oxidation state +6) and manganese dioxide (oxidation state +4). Oxygen gas is also liberated.
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