Q. With reference to the Barium, consider the following statements;
1.Barium is lighter than iron and it is usually found in the upper atmosphere of exoplanets.
2.It is used for spark-plug electrodes and in vacuum tubes as drying and oxygen-removing agents..
Which of the statements given above is/are correct?

[A] 1 only

[B] .2 only

[C] .Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Statement 1 is incorrect: Barium is two and half times heavier than iron. Heavy elements like barium quickly fall into the lower layers of the atmosphere as exoplanets have high gravity.

Recently, scientists have detected barium in the upper atmosphere of two giant exoplanets for the first time.

Statement 2 is correct: Barium is often used in barium-nickel alloys for spark-plug electrodes and in vacuum tubes as drying and oxygen-removing agents.

Source: Heavy metal out there: Researchers detect barium in atmospheres of 2 exoplanets

Share