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Question

Concentrated are used to remove limescale from unreactive ceramic sides of toilets.

A
bases
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B
acids
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C
salts
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Solution

The correct option is B acids
Limescale is limestone dissolved in hard water that accumulates on the ceramic sides of toilets and make them look worn out. To wash it away we need to neutralise it with concentrated acids. So, concentrated acids are used in toilet cleaners.

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