Inert atmosphere for welding of metals is obtained by :

A r, H e

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N_{2}, H e

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O_{2}, N_{2}

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A r, N_{2}

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Solution

The correct option is B $A r, H e$
Helium and argon are used to provide inert atmosphere in the welding of metals or alloys as they do not react with molten metal.

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Q. When

N H_{4} N O_{2}

and

N H_{4} N O_{3}

are heated, gaseous products obtained are:

Gases posses charcteristic critical temperature which depends upo the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

$\begin{matrix} G a s e s & H_{2} & H e & O_{2} & N_{2} C r i t i c a l t e m p e r a t u r e i n K e l v i n & 33.2 & 5.3 & 154.3 & 126 \end{matrix}$