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Question 34

Match Column I with Column II

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  • A - III : Soda ash is the common name for anhydrous sodium carbonate. It is widely used in glass manufacturing and as a water softener.
  • B - IV : Chlorophyll is the green pigment in plants responsible for photosynthesis. Its central metal atom is a magnesium ion, which is held in a porphyrin ring.
  • C - II : Slaked lime or calcium hydroxide is mixed with water to create whitewash. When applied to walls, it reacts with atmospheric CO2 to form a hard, white layer of calcium carbonate.
  • D - I: Calcium sulphate hemihydrate CaSO4.1/2H20, known as Plaster of Paris, is used in dentistry for making moulds and in ornamental plasterwork because it expands slightly upon setting, capturing fine details.
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