What mistake did I make??
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Kelvin scale is not numerically just equal to Celsius scale. 20°C is not equal to 20K. 20°C has a different value in Kelvin scale.
It has another relation which is
0°C = 273.15K ~ 273K
20°C = 273+20 = 293K
So, The correct answer of course is a.293K
Cheers!
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