FORM FOUR CHEMISTRY NECTA 2008

(i)                 Which of the following is not among the instruments and chemicals used for First Aid? 

  1. A Pair of scissors
  2. Assorted bandages
  3. Sterilized cotton wool
  4.  Mosquito spray
  5. Iodine tincture
Choose Answer :


(ii)               If 0.9 g of calcium metal is burnt in air, the mass of powder formed is

  1. 1.14 g
  2.  1.18 g
  3. 1.12 g
  4.  1.08 g
  5. 1.26 g
Choose Answer :


(iii)             Domestic utensils made of iron do rust as a result of the presence of

  1.  air and fire
  2.   air and water
  3. water and oil
  4.  oil and fire
  5.  air and oil.
Choose Answer :


(iv)              Which of the following statements about the hardness of water is not true?

  1. Soft water readily forms lather with soap
  2. Hard water does not readily form lather with soap
  3. Permanent hardness of water is due to sulphates of calcium and magnesium
  4.  Permanent hard water becomes soft on boiling
  5. Calcium and magnesium hydrogen carbonates decompose on boiling.
Choose Answer :


(v)                Elements lose or gain electrons to form

  1. isotopes
  2. radicals
  3.  molecules
  4. ions
  5.  allotropes
Choose Answer :


(vi)              An aqueous solution with pH 6 is

  1. slightly acidic
  2. strongly alkaline
  3.  strongly neutral
  4.  strongly acidic
  5. slightly alkaline.
Choose Answer :


(vii)            The atmospheric effect of burning fuel such as wood and petrol oils is to

  1. reduce oxygen gas
  2.  produce clouds
  3. add carbon dioxide gas
  4. increase water vapour
  5.  produce energy.
Choose Answer :


(viii)          A mixture of 50 cm3  of ethanol and 50 cm3 of pure water can be separated by

  1.  solvent extraction
  2. fractional distillation
  3. simple distillation
  4.  filtration
  5.  decantation.
Choose Answer :


(ix)              The oxidation state of chlorine in sodium chlorate (NaClO3) is

  1.  ­1
  2. +2
  3.  +5
  4.  +3
  5. 3.
Choose Answer :


(x)                When ethane (C2H 6) burns in air with a bright smoky flame the product(s) formed will be

  1.  carbon dioxide gas
  2.  carbon dioxide gas and water
  3. water
  4. water and oxygen gas
  5. oxygen gas.
Choose Answer :


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