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  3. When boilers of water are used for a very long time, then white layers get deposited on inside of these boilers? How can these white layers be remov

. When boilers of water are used for a very long time, then white layers get deposited on inside of these boilers? How can these white layers be remov

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Ans. When hard  water is used in these bioilers, then white scum of salts present in the hard water gets deposited  inside the boilers making a white layer. These white layers can be removed by washing the boilers with dil. HCl acid

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