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1. Which of the following is an example of a mixture?
  • A. Common salt
  • B. Blood
  • C. Sand
  • D. Washing soda

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2. Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]
  • A. 8.5%
  • B. 13.1%
  • C. 17.1%
  • D. 27.6%

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3. The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the
  • A. water vapour in the air around the bottle gains some energy from the bottle
  • B. temperature of the milk drops as it loses heat into the surroundings
  • C. saturated vapour pressure of the milk is equal to the atmospheric pressure
  • D. water vapour in the air around the bottle loses some of its energy to the bottle

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4. The volume of a given gas is V cm3 P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature
  • A. 4 V cm3
  • B. 2 V cm3
  • C. V/2 cm3
  • D. V cm3

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5. Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the
  • A. decrease in nuclear charge
  • B. increase in nuclear charge
  • C. decrease in screening effect
  • D. increase in screening effect

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6. How many unpaired electron(s) are there in the nitrogen sub-levels/
  • A. 3
  • B. 2
  • C. 1
  • D. none

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7. The stability of the noble gases is due to the fact that they
  • A. have no electron in their outermost shells
  • B. have duplet or octet electron configurations
  • C. belong to group zero of the periodic table
  • D. are volatile in nature

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8. The maximum number of electrons in the L shell of an atom is
  • A. 2
  • B. 8
  • C. 18
  • D. 32

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9. Elements in the same period in the periodic table have the same
  • A. number of shells
  • B. atomic number
  • C. chemical properties
  • D. physical properties

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10.12D + 13T → 24He + 01n + energy
The reaction above illustrates
  • A. alpha decay
  • B. artificial transmutation
  • C. nuclear fussion
  • D. nuclear fission

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