Name the product formed when hydrogen burns in air with a pale blue flame.

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Solution

Pure hydrogen gas burns with a pale blue flame with no pop-up sound. Impure hydrogen gas burns with a pop-up sound because of impurities present in it
In a flame of pure hydrogen gas, burning in air, the hydrogen (H₂) reacts with oxygen (O₂) to form steam which on condensation forms water (H₂O). This reaction is highly exothermic (i.e in this process heat is released). It can be shown by the following reaction.
$2 H_{2} (g) + 2 O_{2} (g) \to 2 H_{2} O (g)$

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