Which of the following are exothermic reactions these are

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Combination of glucose and oxygen to form carbon dioxide and water

Combination of carbon and oxygen to form carbon monoxide

Combination of nitrogen and oxygen to form nitrogen monoxide

Combination of zinc and hydrochloric acid to form zinc chloride and hydrogen

answer is B.

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Detailed Solution

The formation of nitric oxide from the reactants $N_{2}$ gas and $O_{2}$ gas.

$N_{2} (g) + O_{2} (g) + Q \to 2 NO (g); Δ H = + ve & Endothermic$

The formation of Co from the reactants C and $O_{2}$ gas $2 C_{(s)} + O_{2 (g)} \to 2 C O_{(g)}, Δ H = - v e$ and exothermic the formation of $C O_{2}$ and $H_{2} O$ from glucose and $O_{2}$ $C_{6} H_{12} O_{6 (s)} + 6 O_{2 (g)} \to 6 C O_{2} + 6 H_{2} O, Δ H = - v e$ and exothermic. The formation of zinc chloride and $H_{2}$ from Zn and HCl. $Z n_{(s)} + 2 H C l_{(a q)} \to Z n C l_{2 (a q)} + H_{2 (g)}, Δ H = - v e$ and exothermic.