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Thermal conductivity of aluminium, copper and stainless steel increases in the order

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Thermal conductivity of aluminium, copper and stainless steel increases in the order

(a) copper < aluminium < stainless steel

(b) stainless steel < aluminium < copper

(c) aluminium < copper < stainless steel

(d) copper< stainless steel < aluminium

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Correct option is (b) stainless steel < aluminium < copper

The thermal conductivity of copper is maximum and that of stainless steel (alloy) is minimum. So, the order of thermal conductivity is 

stainless steel < aluminium < copper

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