Short Answer TypeWhich of the following is a more stable complex and why?
(i) [Co(NH3)6]3+
(ii) [Co(en)3]3+
An element with density 11.2 g cm-3 forms a f.c.c. lattice with edge length of 4 x10-8
Calculate the atomic mass of the element. (Given: NA = 6.022x 10-23 (mol-1)
Examine the given defective crystal:
Answer the following questions:
(i) What type of stoichiometric defect is shown by the crystal?
(ii) How is the density of the crystal affected by this defect?
(iii) What type of ionic substances shows such defect?
Calculate the mass of compound (molar mass = 256 g mol-1) to be dissolved in 75 of benzene to lower its freezing point by 0.48 K (Kf= 5.12 kg mol-1 )
Define an ideal solution and write one of its characteristics.
Definition: The solutions that obey Raoult’ s law over the entire range of concentration are called ideal solutions. Examples: n-hexane and n-heptane.
Characteristics: For ideal solutions:
Enthalpy of mixing (mixH) of the pure components to form the solution is zero.
The volume of mixing (mixV) is also equal to zero.
Outline the principles behind the refining of metals by the following methods:
Zone refining method
Outline the principles behind the refining of metals by the following methods:
Chromatographic method
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