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1. A mixture is different from a compound because
  • A. the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents
  • B. a mixture is always homogeneous while a compound is not
  • C. the constituent of a compound are chemically bound together while those of a mixture are not
  • D. a mixture can be represented by a chemical formula while a compound cannot

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2.What is the percentage of sulphur in sulphur (IV) oxide?
  • A. 66%
  • B. 25%
  • C. 40%
  • D. 50%

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3. A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.
  • A. 128
  • B. 8
  • C. 16
  • D. 64

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4. 200 cm3 of a gas at 25oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm3 at 75oC.
  • A. 342.53 mmHg
  • B. 1430.54 mmHg
  • C. 467.11 mmHg
  • D. 400.00 mmHg

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5. An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following statements is correct about the element?
  • A. lt has a completely filled p-orbital
  • B. lt has 5 electrons in its outermost shell.
  • C. lt belongs to group ll on the periodic table
  • D. lt is a halogen

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6. Beryllium and aluminium have similar properties because they
  • A. are both metals
  • B. belong to the same group
  • C. belong to the same period
  • D. are positioned diagonally to each other

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7. If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is
  • A. metallic
  • B. covalent
  • C. co-ordinate
  • D. ionic

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8. How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
  • A. 27, 33 and 33
  • B. 33, 27 and 27
  • C. 27, 33, and 27
  • D. 60, 33 and 60

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9. The radio active radiation used in studying the arrangement of particles in giant organic molecules is
  • A. – rays
  • B. – particles
  • C. X-rays
  • D. – particles

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10. A silicon containing ore has 92% 28Si, 5% 29Si and 3% 30Si. Calculate the relative atomic mass of the silicon.
  • A. 14.00
  • B. 29.00
  • C. 28.11
  • D. 28.00

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