SPM Chemistry Set 1B

  1. The symbols of two elements are 199Q and 4020R. If P and Q combine to form a compound, what is the relative formula mass of this compound?
    1. 59
    2. 78
    3. 97
    4. 99
  2. Which substance is used as flavourings?
    1. Sodium nitrite
    2. Azo compounds
    3. Ascorbic acid
    4. Monosodium glutamate*
  3. Which of the following ions reduce the effectiveness of soaps in hard water?
    1. Calcium ions and sodium ions
    2. Aluminium ions and iron(II) ions
    3. Calcium ions and magnesium ions
    4. Magnesium ions and potassium ions
  4. Half equation below represents a reaction.
    2I → I2 + 2e
    What is meant by oxidation reaction based on the equation ?

    1. Electrons are received by iodine
    2. Electrons are received by iodide ion
    3. Electrons are released by iodine
    4. Electrons are released by iodide ions
  5. The following equation represents the oxidation of magnesium atom.
    Mg → Mg2+ + 2e
    What is meant by oxidation based on the equation?

    1. Electrons are received by magnesium ion
    2. Electrons are donated by magnesium ion
    3. Electrons are received by magnesium atom
    4. Electrons are donated by magnesium atom
  6. Diagram below shows a type of chemical cell. Which of the following statements is correct?

    1. This is a non-rechargeable cell
    2. The lead plate coated with lead(IV) oxide is the positive terminal of the cell
    3. Oxidation reaction occurs at the positve terminal
    4. The electrolit used is nitric acid
  7. Metal X is soft and shiny. It reacts with cold water to produce an alkaline solution.
    What is metal X?

    1. Magnesium
    2. Sodium
    3. Copper
    4. Zinc
  8. 1 mol dm-3 solution X is electrolysed using carbon electrodes. A greenish-yellow gas with a pungent and choking smell is released at the anode. Which of the following may be solution X?
    1. 0.0001 mol dm-3 potassium sulphate
    2. 0.0001 mol dm-3 hydrochloric acid
    3. 2 mol dm-3 potassium sulphate
    4. 2 mol dm-3 hydrochloric acid
  9. Which statements are true about elements when going across Period 3?
    1. The atomic size of elements increase.
    2. The electronegativity of atoms of the elements increase.
    3. The properties of the oxide of the elements change from basic oxide to ampotheric oxide and acidic oxide.
    4. The nuclei force of attraction of atoms towards electron to achieve stable electron arrangement becomes weaker.
  10. Which of the following pairs show the correct uses of the isotopes?
    1. Cobalt-60: To destroy bacteria in food
    2. Carbon-14: To estimate the age of artifacts
    3. Iodine-131: To detect the location of tumour
    4. Sodium-24: To detect leaks in underground petroleum piping

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