Question

What is hard water?
 A. Low mineral content
 B. Contaminated water
 C. High mineral content
 D. Both B and C

Answer 1

Hint: Hard water is water that has high mineral content material (in evaluation with "tender water"). Hard water is formed when water percolates via deposits of limestone, chalk or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

Complete step by step solution:
Hard water is water that has high mineral content (in contrast with "smooth water"). Hard water is formed when water percolates thru deposits of limestone and chalk that are largely made from calcium and magnesium carbonates. Hard consuming water may additionally have moderate health advantages, however can pose severe issues in commercial settings, wherein water hardness is monitored to keep away from high-priced breakdowns in boilers, cooling towers, and other devices that handle water.
Water pollutants are the contamination of water in our bodies, usually due to human sports. Water our bodies encompass as an instance lakes, rivers, oceans, aquifers and groundwater. For instance, freeing inadequately dealt with wastewater into natural water can lead to degradation of aquatic ecosystems.

So the correct answer is D.

Note:
Water's hardness is determined with the aid of the attention of multivalent cations inside the water. Multivalent cations are undoubtedly charged metallic complexes with a rate extra than $1 + $. Usually, the cations have the price of two+. Common cations discovered in tough water include $C{a^{2 + }}$and $M{g^{2 + }}$. These ions enter a water delivery via leaching from minerals within an aquifer. Common calcium-containing minerals are calcite and gypsum. A common magnesium mineral is dolomite (which also includes calcium). Rainwater and distilled water are gentle, due to the fact they contain few ions.