Class IX

The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 ∘C20 ∘C and one bar will be released when 0.15g of aluminum reacts?
  1. 252.5 mL
  2. 202.5 mL
  3. 302.5 mL
  4. 108.2 mL
Which of the following is the correct ideal gas law
  1. pV = 2RT
  2. pV = nT
  3. pV = nRT
  4. pV = 2nR
Which are three important states of matter ?
  1. solid, liquid and gas
  2. atoms, molecules and ions
  3. solid, liquid and plasma
  4. solid, glasses and gases
dipole-dipole forces act between molecules that have
  1. an induced electrical dipole moment
  2. an electron cloud that causes temporary dipoles
  3. a permanent electrical dipole moment.
  4. a permanent magnetic dipole moment
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.
  1. 0.65 bar
  2. 0.8 bar
  3. 0.97 bar
  4. 1.12 bar
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