Multiple choice

Which of the following statements is/are not correct?

P. Manganese metal is used as scavenger in making steel. Q. All known isotopes of technetium are radioactive, except 98Tc. R. Rhenium is used in the making of electric furnace windings and spectrophotometer filaments.

  1. Only P

  2. Only Q

  3. Only R

  4. P and Q

  5. Q and R
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 properties. 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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