Which of the following pairs of substances can be broken down chemically?

Ammonia and iron

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Helium and argon

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Methane and water

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Potassium and lithium

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Water and carbon

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Solution

The correct option is E Methane and water
$C H_{4} + H_{2} O \to C O_{2} (g) + H_{2} (g)$
When more amounts of methane combine with water methane hydrates or methane clathrates are formed. Increased temperatures on oceans cause global warming by the melting of methane hydrates.

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