Class XI

The element common to all acids is
  1. hydrogen
  2. . carbon
  3. . sulphur
  4. oxygen
The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
  1. bromine
  2. fluorine
  3. chlorine
  4. sulphur
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
Which of the following is in liquid form at room temperature?
  1. Lithium
  2. Sodium
  3. Francium
  4. . Cerium
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