Multiple choice

Which of the following statements is/are not correct?

  1. Mn metal is used as a scavenger in making steel.
  2. All known isotopes of Tc are radioactive, except Tc98.
  3. Re is used in the making of electric furnace windings and spectrophotometer filaments.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

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

This option is correct because Technetium (99Tc) was the first man-made element with radioactive property. All known isotopes of technetium (includes 97Tc, 98Tc) have radioactive properties. It is one of the fission products of uranium. It is obtained by spent fuel rods in nuclear reactors.

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