Class IX

Compounds have atoms of
  1. same sizes
  2. different sizes
  3. same electrons
  4. different electrons
A balloon filled with 5g of hydrogen contains
  1. 2.48 moles of H2
  2. 3.48 moles of H2
  3. 4.48 moles of H2
  4. 5 moles of H2
If one mole of carbon contains x atoms then number of atoms in 12g of Mg are
  1. x
  2. 0.5x
  3. 2x
  4. 1.5x
A free radical has
  1. unpaired electrons
  2. paired electrons
  3. no electrons
  4. even no. of electrons
Biochemistry deals with
  1. physical changes in humans
  2. chemical changes in humans
  3. A and B both
  4. physical and chemical changes in living organisms
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