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Reactivity of Actinides

The noble gas...

Question

The noble gas that was discovered first on sun and then on earth is:

A

Neon

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B

Argon

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C

Xenon

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D

Helium

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Solution

The correct option is D
Helium

Helium was detected by Janssen and Lockyer independently in the spectrum of the sun in the year 1868. Later in 1885 it was found on the earth by Ramsay.

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Q. The noble gases are a group of chemical elements with very similar properties. The six noble gases that occur naturally are helium (He), neon (Ne),argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).The noble gases are:
(a) Mono atomic, colorless and odorless
(b) diatomic, colorless and odorless
(c) have very low chemical reactivity

Q. Gases like helium, neon and xenon have a special atomic structure that makes them chemically quite inert. They are also rare in their natural occurrence on earth. The presence of these rare gases was discovered by Sir William Ramsay of Great Britain, for which he was awarded the Nobel Prize in:

Who discovered noble gas?

Q. A rare gas that was detected in the sun before its discovery on earth is :

Q. Oxygen reacts with platinum (VI) fluoride,

P t F_{6}

O_{2} + P t F_{6} \to O_{2}^{+} P t F_{6}^{-}

It was suggested that xenon should react similarly and, in this way,the first noble gas compound was produced.

X e + P t F_{6} \to X e^{+} P t F_{6}^{-}

The most likely reason for the suggestion being made, is:

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