Manipal Entrance Test 2014 Chemistry Paper

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Question : 45 of 60
 
Marks: +1, -0
A certain radioactive isotope ZAX (half-life =10 days decays to give Z−2A−4X. If 1.0g of X is kept in a sealed vessel find the volume of He accumulated at STP in 20 days. Molar mass of ZAX=253u
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