Short Answer Typei) Name the method of refining of nickel
ii) what is the role of cryolite in the extraction of aluminium
iii) what is the role of limestone in the extraction of iron from its oxides ?
(i) Mond’s Process use in the refining of nickel
(ii)The melting point of alumina is very high. It is dissolved in cryolite which lowers the melting point and brings conductivity / acts as a solvent.
(iii)Limestone is decomposed to CaO ,which removes silica impurity of the ore as slag.
Define the following terms:
i)Lyophilic colloid
ii) Zeta potential
iii) Associated colloids
For the first order thermal decomposition reaction, the following data were obtained:
C2H5Cl (g) --> C2H4 (g) +HCl(g)
T/s Total pressure/atm
0 0.30
300 0.50
Calculate the rate constant
(Given: log 2=0.301, log =0.4771, log 4 =0.6021)
An element crystallizes in b.c.c lattice with cell edge of 500 pm. The density of the element is 7.5g cm-3. How many atoms are present in 300 g of the element ?
The elements of 3d transition series are given as:
Sc Ti V Cr Mn Fe Co Ni Cu Zn
Answer the following:
i) Write the element which shows a maximum number of oxidation states.Give reason.
ii) Which element has the highest m.p?
iii) Which elements shows only +3 oxidation state ?
iv) which element is a strong oxidising agent in +3 oxidation state and why?
Write the structure of an isomer of compound C4H9Br which is most reactive towards SN1 reaction.
Write the chemical equations involved in the following reactions:
i) Hoffmann-bromamide degradation reaction
ii) Carbylamine reaction
i) Write the structural difference between starch and cellulose.
ii) What type of linkage is present in Nucleic acid ?
iii) Give one example each for fibrous protein and globular protein.
i) What is the role of sulphur in the vulcanization of rubber?
ii) Identify the monomers in the following polymer:
iii)Arrange the following polymers in the increasing order of their intermolecular forces:
Terylene, polythene, Neoprene
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