1) Which of the following methods results in obtaining pure solvents?
2) To separate a mixture of sulphur and iodine crystals, we can
3) At s.t.p., of which of the following gases would contain the highest number of molecules?
4) A 50 cm3 of a gas Y at 20 oC and 760 mmHg contain Z atoms. Another gas X of 25 cm3 at the same temperature and pressure will contain
5) A hydride XH3 has a vapour density of 8.5. The atomic mass of X is
6) Under the same conditions, a gas X diffuses four times as fast as another gas Y. If the relative molecular mass of X is 2, what is the relative molecular mass of Y?
7) If 0.16 mole of oxygen and 0.29 mole of ammonia are mixed in a vessel with a total pressure of 0.5 atmosphere, calculate the partial pressure of ammonia in the mixture?
8) Water molecules are in the least disorderly arrangement in
oC
oC
oC
oC
9) Melting begins when
10) A particle contains 7 electrons, 7 neutrons and 6 protons. Such
particle is


 

 

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