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1 .The presence of an impurity in substance will cause the melting point to
  • A. be zero
  • B. reduce
  • C. increase
  • D. be stable

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2.What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm3 of oxygen?
  • A. 5 dm 3
  • B. 20 dm 3
  • C. 15 dm 3
  • D. 10 dm 3

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3. The rate of diffusion of a gas Y is twice that of Z If the relative molecular mass of Y is 64 and the two gases diffuse under the same conditions, find the relative molecular mass of Z
  • A. 32
  • B. 4
  • C. 8
  • D. 16

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4. The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
  • A. carbon-14
  • B. phosphorus-32
  • C. cobalt-60
  • D. iodine-131

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5.The shape of the carbon (lV) oxide molecule is
  • A. pyramidal
  • B. linear
  • C. angular
  • D. tetrahedral

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6. Which of the following molecules is held together by hydrogen bond?
  • A. CH4
  • B. HBr
  • C. H2SO4
  • D. HF

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7. The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is
  • A. metallic
  • B. covalent
  • C. dative
  • D. ionic

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8.The constituent of air that acts as a diluent is
  • A. nitrogen
  • B. carbon (IV) oxide
  • C. noble gases
  • D. oxygen

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9. Steam changes the colour of anhydrous cobalt (ll) chloride from
  • A. white to red
  • B. blue to white
  • C. blue to pink
  • D. white to blue

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10. An example of a hygroscopic substance is
  • A. CuO (S).
  • B. MgCL2(S).
  • C. CaCL2(S).
  • D. NaOH(S).

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