Question

Which element's block is used to keep a radioactive substance ?

• A. Chromium
• B. Lead
• C. Iron
• D. Gold

Answer 1

The correct option is B

Lead

The explanation for the correct answer

Option B

Lead is used to keep a radioactive substance.

• Lead ($\mathrm{Pb}$) is highly effective in proving protection from the sources of radiation.
• Because of this reason, it is used in the design of radiation protection systems.

The explanation for the incorrect answers

Option A

• Chromium ($\mathrm{Cr}$) is used in electroplating,tanning,printing,medicine,fuel,catalyst and metal corrosion inhibitors.

Option C

• Iron($\mathrm{Fe}$) is used to make bridges, electricity pylons, bicycle chains, cutting tools, and rifle barrels.

Option D

• Gold ($\mathrm{Au}$) is used in electronics, space exploration, medicine, and aerospace industries.

Conclusion: Hence Option B is correct.