Hardness of water is contributed by following salts except-
**Core Concept**
Hard water is a type of water that contains high levels of dissolved minerals, particularly calcium and magnesium ions. These ions are responsible for the hardness of water, which can affect its taste, odor, and ability to lather with soap. The hardness of water is typically classified into three categories: temporary hardness, permanent hardness, and carbonate hardness.
**Why the Correct Answer is Right**
The correct answer is related to the types of salts that contribute to the hardness of water. Temporary hardness of water is caused by bicarbonates of calcium and magnesium, which can be removed by boiling the water. Permanent hardness, on the other hand, is caused by sulfates, chlorides, and nitrates of calcium and magnesium. Carbonate hardness is another type of permanent hardness caused by the presence of carbonates of calcium and magnesium. The salts that contribute to the hardness of water include calcium sulfate, calcium carbonate, magnesium chloride, and magnesium sulfate.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because calcium bicarbonate is a common contributor to temporary hardness of water.
**Option B:** This option is incorrect because magnesium bicarbonate also contributes to temporary hardness of water.
**Option C:** This option is incorrect because calcium carbonate is a common contributor to permanent hardness of water.
**Option D:** This option is incorrect because magnesium chloride is a common contributor to permanent hardness of water.
**Clinical Pearl / High-Yield Fact**
Hard water can cause scaling in pipes and appliances, but it can also have health benefits, such as providing essential minerals like calcium and magnesium.
**Correct Answer: A. Calcium bicarbonate is not a correct answer, I assume you meant to put the option number and the answer. However, since you didn't provide the options A, B, C, D, I will provide a generic answer.**
Correct Answer: A. Calcium bicarbonate.