Important Questions for Chemistry XI

Important Questions for Chemistry XI

1.Calculate the amount of lime (CaO) that can be prepared by heating 200 kg of lime stone (CaCO3) that is 95% pure.
2.Give a reaction to show that nascent hydrogen is more powerful reducing agent than molecular hydrogen.
3.Distinguish between metal and metalloid  with one example for each.
4.Define Avogadro 's hypothesis. How is this hypothesis applied to show that molecular mass of a volatile substance is twice of its vapour density?
5.Sketch a well labelled diagram for the manufacture of ammonia by Haber's process. Write the physical and chemical principles involved in it. Why can't ammonia be dried by passing over conc. Sulphuric acid?
6.Give a brief account of the following terms :i) Concentration of ore ii)Smelting process
7.State Boyle's law and Charle's law. Derive the relation PV = nRT. Two miles of ammonia are enclosed in a five litre flask at 27 degree Celsius. Calculate the pressure exerted by the gas assuming that the gas behaves like an ideal has.

1.Calculate the percentage of S in Na2S2O3 (Na =23, S =32, O =16)
2.Calculate the number of moles of CO2 molecules in 2.24 mL of CO2 at NTP .
3.Distinguish between alloys and amalgam. Give one example for each.
4.State Avogadro' s hypothesis.
5.At what condition the value P x V is always constant?
6.Define universal gas constant and derive its value in SI unit.
7.State Boyle's law and Charle's law and derive ideal gas equation.
8.What do you mean by redox reaction?Justify with an example.
9.Describe the principle involved in the manufacture of ammonia by Haber' s process.


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