GK
BASIC GENERAL KNOWLEDGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The main constituents of pearls are
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calcium oxide and ammonium chloride
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aragonite and conchiolin
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calcium carbonate and magnesium carbonate
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ammonium sulphate and sodium carbonate
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Explanation:
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 (also known as chalk), mined as calcite, is the most commonly used filler for PVC.
Detailed explanation-3: -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).
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