1.

Which among the following is true ?

Answer»

Air is a bad conductor of heat and THERMAL expansion of solids is more than that of GASES.
Air is a good conductor of heat and thermal expansion of solids is less than that of gases.
Air is a bad conductor of heat and thermal expansionof solids is less than that of gases.
Air is a good conductor of heat and thermal expansion of solids is more than that of gases.

Solution :Conduction of HEATIN matter takes palce via themolecules. ONE molecule.Absorbsheatand passes it to the other MOLECULAE. As ingasous state the molecules are far away from each other, the heat connot be transferred frommolecule to molecule, and thusthere is no conductionof heatthroughair whichis a mixture ofgases.
In cases of solid, themolecules are closelypacked and theintermolecularforce of attraction are maximum .Therefore, on heating the molecules cannotmove freelythereby showigless expansion thangeses inwhich the forece of attraction betweenmolecules is less, andhence, on heating KE of molecules increses, andtherefore, the volumeincreases.


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