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Q.

The volume percentage of argon in air is nearly:

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a

6%

b

10%

c

1%

d

75% 

answer is C.

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Detailed Solution

Because 0.93% argon is present. The third most common element in the atmosphere is argon. With the symbol Ar and atomic number 18, it is a noble gas. Natural sources of argon include potassium isotope K-40. However, in the industrial setting, it is made by fractional distillation of liquid air.
 
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