Class IX

Which of the following is not a compound?
  1. marble
  2. washing soda
  3. quick lime
  4. brass
The number of metals which exist as gas is/are
  1. one
  2. two
  3. three
  4. none
Which of the following is not a noble gas?
  1. Helium
  2. Neon
  3. Argon
  4. Hydrogen
Which of the following is a metalloid?
  1. Germanium
  2. Gallium
  3. Carbon
  4. Sodium
On heating a mixture of iron fillings and sulphur, it is observed that:
  1. On heating a mixture of iron fillings and sulphur, it is observed that:
  2. a grey mass is formed
  3. brown fumes are evolved
  4. no change occurs
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