IIT-JEE Chemistry-Some Basic Concepts Online Test

1.The weights in atomic mass units and in grams of 2710 atoms of C-12 are, respectively


2. The number of N atoms in 3g of urea are


3. A sample of ammonium phosphate contains 0.84 moles of oxygen atoms. The number of moles of hydrogen atoms in the sample is


4. An organic compound contains 36% carbon, 15% hydrogen and the rest oxygen. Its emphirical formula is


5. 100 ml ethanol of density 0.3g/cm3 is mixed with 45 ml of water to give a mixture of density 0.5g/cm3. The molarity of ethanol in the solution is







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