Q.1
Which of the following statements about a compound is incorrect?
  • A molecule of a compound has atoms of different elements.
  • The ratio of atoms of different elements in a compound is fixed.
  • A compound retains the physical properties of its constituent elements.
  • A compound cannot be separated into its constituent elements by physical methods of separation.
Q.2
Weight of one atom of an element is $6.644 \times 10^{-23} \ g $. Calculate g-atom of elements in 40 kg
  • $10^4 \ g-atom$
  • $10^3 \ g-atom$
  • $10^5 \ g-atom$
  • $10^2 \ g-atom$
Q.3
How many gram of concentrated hydrochloric acid containing 37.9% HCl  by weight will contain 6 g of HCl?
  • 15.84 g
  • 14.1 g
  • 13.6 g
  • 11.2 g
Q.4
The volume of 1.0 g of hydrogen in litres at N.T.P is
  • 11.2
  • 2.24
  • 22.4
  • 1.12
Q.5
The unit of Molar mass is
  • gm/moles
  • None of the these
  • moles/gm
  • g moles
Q.6
The sum of the mole fraction of all the components in a solution is
  • 0
  • None of the above
  • -1
  • 1
Q.7
If 500 mL of a 5M solution is diluted to 2500 mL, what will be the molarity of the solution obtained
  • 1.59 M
  • 0.017 M
  • 1.0 M
  • 1.66 M
Q.8
If 20.0 mL of 1 M CaCl2 and 60 mL of .200 M CaCl2 are mixed, the molarity of the final solution will be
  • .8 M
  • .1 M
  • .5 M
  • .4 M
Q.9
Which of the following statements indicates that law of multiple proportion is being followed
  • When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium oxide formed
  • Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1:2.
  • Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2:1.
  • At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour.
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