A block of iron sinks in water, but floats in mercury, this is because:
A
Water is heavier than iron block
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B
Iron block is heavier than mercury
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C
Water is heavier than mercury
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D
Mercury is heavier than water
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Solution
The correct option is D Mercury is heavier than water A block of iron is heavier than water therefore it sinks in water. A block of iron is lighter than mercury therefore it floats on mercury. Hence, mercury is heavier than water.