GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Calcium oxide, Ammonium Chloride
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Ammonium Sulphate, Sodium Carbonate
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Calcium Carbonate, Magnesium Carbonate
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Argonite, Chonchiolin
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Detailed explanation-1: -Pearls are made primarily of calcium carbonate, so they can be dissolved in vinegar. Calcium carbonate is susceptible to even a weak acid solution because the crystals react with the acetic acid in the vinegar to form calcium acetate and carbon dioxide. The pearls are mainly used in production of jewellery.
Detailed explanation-2: -Calcium carbonate is used in the manufacture of cement, iron, steel and lime, to neutralize soil acidity and as a constituent of antacids. Properties: r.d. 2.7 (calcite).
Detailed explanation-3: -Calcium carbonate (also known as chalk), mined as calcite, is the most commonly used filler for PVC.
Detailed explanation-4: -Calcium carbonate is a dietary supplement used when the amount of calcium taken in the diet is not enough. Calcium is needed by the body for healthy bones, muscles, nervous system, and heart. Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and upset stomach.