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  • Which of the following metals were used in old clock or watch dials to illuminate them in dark?Option: 1 <img alt="\mathrm{Ba}" src="https://entrance

Which of the following metals were used in old clock or watch dials to illuminate them in dark?

Option: 1

\mathrm{Ba}


Option: 2

\mathrm{Na}


Option: 3

\mathrm{Mg}


Option: 4

\mathrm{Ra}


Answers (1)

best_answer

Radium is radio luminescent and glows in dark. So, in old times it was used in clock or watch dials to glow in dark.

Hence option 4 is correct.

Posted by

manish painkra

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