Short Answer TypeAn element with density 2.8 g cm−3 forms of the f.c.c. unit cell with edge length 4 X10−8 cm. Calculate the molar mass of the element.
(Given: NA = 6.022 X 1023 mol −1)
(i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?
(ii) What type of stoichiometric defect is shown by NaCl?
OR
How will you distinguish between the following pairs of terms:
(i) Tetrahedral and octahedral voids
(ii) Crystal lattice and unit cell.
State Kohlrausch's law of independent migration of ions. Why does the conductivity of a solution decrease with dilution?
For a chemical reaction R → P, the variation in the concentration (R) vs. time (t) plot is given as,
(i) Predict the order of the reaction.
(ii) What is the slope of the curve?
Explain the principle of the method of electrolytic refining of metals. Give one example.
Electrolytic refining; Electrolytic refining is the process of refining impure metals by using electricity. In this process, impure metal is made the anode and a strip of pure metal is made the cathode. A solution of a soluble salt of the same metal is taken as the electrolyte. When an electric current is passed, metal ions from the electrolyte are deposited at the cathode as a pure metal and the impure metal from the anode dissolves into the electrolyte in the form of ions. The impurities present in the impure metal gets collected below the anode. This is known as anode mud.
Copper refined by the electrolytic refining.
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