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1. Question4 points
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is: [IIT-JEE Mains 2013]Correct
2. Question4 points
The volume of oxygen evolved at STP, by decomposition of 0.68 g ‘20 volume’ hydrogen peroxide solution, is [MH-CET 2014]Correct
3. Question4 points
The system that contains the maximum number of atoms is [WBJEEM 2014]Correct
4. Question4 points
1.78 g of an optically active L-amino acid (A) is treated with NaNO2/HCl at 0º C. 448 cm3 of nitrogen was at STP is evolved. A sample of protein has 0.25% of this amino acid by mass. The molar mass of the protein is [Karnataka CET 2014]Correct
5. Question4 points
10 g of a mixture of BaO and CaO requires 100 cm3 of 2.5 M HCl to react completely. The percentage of calcium oxide in the mixture is approximately
(Given : molar mass of BaO = 153) [Karnataka CET 2014]Correct