The p-Block Elements Test - 47

$$Xe$$ is known as stranger gas because it belongs to the noble gas category but it reacts with oxygen and fluorine. So, stranger gas name is given to it. 

Molecules of noble gas does not possess vibrational energy because noble gases are monoatomic. So, there is no other atom in respect of which it can vibrate. So they do not vibrate. Hence they do not posses vibrational energies.

Hence option  A is correct.

Traces of krypton are found in various minerals, the most important source of Krypton is Earth's atmosphere. Air is also the  source for the other noble gases, with the exception of helium which obtained from natural gas and radon  which is obtained as a byproduct of the decay of radioactive elements

So Krypton is not obtained during radioactive disintegration. It is radon formed during radioactive disintegration.

Hence option $$B$$ is correct.

Coloured lighting in discharge tubes are usually filled with neon. Mixing with other gases results in different coloured lights.

On April 20, 1902, Marie and Pierre Curie successfully isolate radioactive radium salts from the mineral pitchblende in their laboratory in Paris. In 1898, the Curies discovered the existence of the elements radium and polonium in their research of pitch blende.

Helium gas emits a pale yellow colour when present in an electrified discharge tube. This is used in making colourful and glowing signs.

Hence option D is correct

Germanium forms tetrahalides with all halogens except astatine and forms dihalides with all halogens except bromine and astatine.

Noble gases are sparingly soluble in water. The solubility of noble gases in water increases as the size of noble gases increases. Noble gas is soluble in water due to dipole induced dipole interaction(forces). As the size of noble gas increases, it can be polarized easily by water molecules and distort the electron cloud. Due to this reason the solubility of inert gases in water increases as the size increases from $$He$$ to $$Rn$$.

So in the given noble gases, Krypton is most soluble in water at $$293\ K$$.

Hence option $$D$$ is correct.

The boiling points of noble gases are very low because they have very weak forces of attraction among the atoms. The boiling point of noble gases is lowest for helium as it has the smallest size among noble gases. The boiling point increases in the order: