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Multiple Choice Question with Only One Choice Correct
A gas does 4.5 J of external work during adiabatic expansion. If its temperature falls by 2K, its internal energy will

(a)	increase by 4.5 J	(b)	decrease by 4.5 J
(c)	decrease by 2.25 J	(d)	increase by 9.0 J

Chemistry

Calculate the quantity of charge necessary to produce 10 L of H₂(g) measured at STP from electrolysis of water. What amount of water will undergo electrolysis and what will be the amount of O₂(g) liberated?

Mathematics

The interior angles of a polygon are in arithmetic progression. The smallest angle is 120^o and the common difference is 5^o. Find the number of sides.

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