_________ , a greenhouse gas is released during the decomposition of limestone.

Carbon dioxide

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Methane

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Ozone

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Nitrous oxide

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Solution

The correct option is A Carbon dioxide
Limestone contains calcium carbonate $(C a C O_{3})$ , which when heated at high temperature decomposes to give calcium oxide $(C a O)$ and carbon dioxide $(C O_{2})$ as shown below.

${CaCO}_{3} (s) Δ \to CaO (s) + {CO}_{2} (g) Calcium Calcium Carbon carbonate oxide dioxide$

Greenhouse gases absorbs infrared rays from the sun and traps heat, thereby increasing the temperature of the Earth's atmosphere.

Although, carbon dioxide ( $C O_{2}$ ), methane $(C H_{4})$ , ozone $(O_{3})$ and nitrous oxide $(N_{2} O)$ are greenhouse gases, only $(C O_{2})$ is released during decomposition of limestone.

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Question 8

(a) Name a gas that is released during the combustion of a fuel.

(b) The solid form of carbon dioxide is known as _____.

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