The speed of sound is maximum in

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Air

Hydrogen

Water

Iron

answer is D.

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Detailed Solution

The speed of sound is maximum in iron.
The speed of sound is greatest in solids and decreases from solids to liquids and from liquids to gases. This is because sound cannot pass through a vacuum.
Molecules in solid media are much closer together than in liquids or gases, so sound waves can pass through them faster. In fact, sound waves travel more than 17 times faster in steel than in air. Sound travels the slowest in gases. This is because the molecules in the gas are very far apart. Sound travels faster in liquids than in gases because the molecules are closer together.

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