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2361

25.0g of potassium chloride were dissolved in 80g of distilled water at 30\(^0\)C. Calculate the solubility of the solute in mol dm\(^3\). [K =39, Cl = 35.5]

  • A. 3.9 moldm\(^3\)
  • B. 4.6 moldm\(^3\)
  • C. 4.0 moldm\(^3\)
  • D. 4.2 moldm\(^3\)
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2362

An example of a physical change is 

  • A. slaking of lime
  • B. liquefaction of liquids
  • C. dissolution of limestone in acid
  • D. rusting of iron
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2363

The product formed when ethyne is passed through a hot tube containing finely divided iron is

  • A. polymeric
  • B. saturated
  • C. hydrated
  • D. aromatic
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2364

H\(_2\)S\(_{(g)}\)  +  Cl\(_2\)\(_{(g)}\) → 2HCl\(_{(g)}\) + S\(_{(s)}\)

What is the change in oxidation state of sulphur from reactant to product?

  • A. -3 to -1
  • B. -3 to 1
  • C. -2 to 0
  • D. -1 to 0
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2365

If a stable neutral atom has a mass number of 31, the number of electrons and neutrons respectively are

  • A. 15 and 16
  • B. 16 and 31
  • C. 15 and 31
  • D. 16 and 15
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