Class XI

Monazite is an ore of
  1. titanium
  2. zirconium
  3. iron
  4. thorium
The element common to all acids is
  1. hydrogen
  2. carbon
  3. sulphur
  4. oxygen
From which mineral is radium obtained?
  1. . Rutile
  2. Haematite
  3. Limestone
  4. . Pitchblende
Chlorophyll is a naturally occurring chelate compound in which central metal is
  1. copper
  2. magnesium
  3. iron
  4. calcium
What is laughing gas?
  1. . Nitrous Oxide
  2. Carbon monoxide
  3. . Sulphur dioxide
  4. Hydrogen peroxide
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