Argon is used:
The chemical element Argon is a noble gas with 18 as its atomic number.
Argon is used in high-temperature welding and operations that require a non-oxidising atmosphere along with the absence of nitrogen.
Thus, option A) is the correct answer.
The chemical element Argon is a noble gas with 18 as its atomic number. It is chemically inert. Argon is the third most abundant gas in the earth’s atmosphere. It is the cheapest alternative gas and therefore can be used as filler. Argon also has low thermal conductivity.
Argon is used as:
Argon is used in high-temperature welding as an inert shielding gas. It is because even at very high temperatures, argon remains inactive. It generates a non-oxidizing atmosphere and is hence favourable for many industrial processes.
The answer is option (A): "Argon is used in high-temperature welding"
Method used for separation of mixture of products (B and C) obtained in the following reaction is: 
Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \). 
Choose the correct answer from the options given below:
For x < 0:
f(x) = ex + ax
For x ≥ 0:
f(x) = b(x - 1)2