Class X

Which are the following number are odd ?
Chlorophyll is a naturally occurring chelate compound in which central metal is
  1. copper
  2. magnesium
  3. iron
  4. calcium
Which of the following is used in pencils?
  1. Graphite
  2. Silicon
  3. Charcoal
  4. Phosphorous
Washing soda is the common name for
  1. Calcium bicarbonate
  2. Sodium carbonate
  3. Calcium carbonate
  4. Sodium bicarbonate
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