Multiple choice

Which of the following statements is/are incorrect?

  1. In floatation process, ZnO and SO3 are formed from sulphide ores.
  2. Fe is used as coating material to prevent the corrosion of Zn.
  3. Cd metal is used in nuclear reactors as a neutron excitation material.
  4. Mercury is used extensively in the production of sodium hydroxide and chlorine gas commercially.

  1. Only 1

  2. 2 and 3

  3. 3 and 4

  4. 1, 2 and 3

  5. 2, 3 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because Zn is used as a coating material to prevent the corrosion of Fe. Cd metal absorbs neutrons very well, and is used to make control rods in nuclear reactors.

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