Question : Brown stains in vessels and clothes indicate the presence of high quantities of ____ in water.
Option 1: magnesium
Option 2: calcium
Option 3: manganese
Option 4: chromium
Correct Answer: manganese
Solution : The correct option is manganese .
Brown stains in vessels and cloths often indicate the presence of high quantities of manganese in water. Manganese can react with oxygen and other compounds in water to form brownish-coloured deposits that can lead to staining on surfaces and fabrics. Water with elevated levels of manganese can have aesthetic issues such as discolouration and staining, and it may also have potential health implications if consumed in high concentrations.
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