The main constituents of pearls are
calcium oxide and ammonium chloride
calcium carbonate and magnesium carbonate
aragonite and conchiolin
ammonium sulphate and sodium carbonate
Additional Questions
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Amalgams are |
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Which of the following is the lightest metal? |
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Which of the following metals remain in liquid for under normal conditions? |
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Potassium Permanganate is used for purifying drinking water, because |
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Which of the following is an element? |
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Which of the following is used as a moderator in nuclear reactor? |
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Which among the following is a positively charged particle emitted by a radioactive element? |
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Atoms are composed of |
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In an atomic explosion, enormous energy is released which is due to |
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Isotopes are separated by |
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