a) Silica aerogels
b) Manganese aerogels
c) Potassium aerogels
d) Lead aerogels
Answer: a
Explanation: The best insulator is silica aerogels. The thermal conductivities of silica aerogel is less than 0.03 W/m*K in atmosphere.The liquid is removed from the gel without collapsing its structure, thus creating air pockets in the medium. This slows down the heat transfer and act as the insulator.
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