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{:("Column X ","Column Y "),("a. 40 g of He" ," i." 6.022xx10^(23)"atoms"),("b. 35 g of Li " ," ii. 10 atoms"),("c. 40 u of He"," iii." 6.022xx10^(24)"atoms"),("d. 16 g of "O_(2) ," iv." 3.011xx10^(24) "atoms"):}

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Answer :a.(iii), B.(iv), C.(II), d.(ii)


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