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Name a substance which on addition to AgCl causes cation vacancy in it.Marks:1
When CdCl2 or SrCl2 is added to AgCl , it gives a solid solution where divalent Cd2+ or Sr2+ occupies the Ag+ site and results in cation vacancies which are equal in number to that of the divalent ions.
Mention a large scale use of the phenomenon called ‘reverse osmosis’.Marks:1
In large scale, the reverse osmosis is used for the desalination of sea water.
Give an example of a pseudo first order reaction.Marks:1
The hydrolysis of cane sugar in presence of some mineral acids like HCl or H2SO4 is an example of a pseudo first order reaction.
C12H22O11 + H2O →
C6H12O6 + C6H12O6 Glucose Fructose
Write the IUPAC name of the following :- (CH3)2C=CHCOCH3Marks:1
The IUPAC name of (CH3)2C=CHCOCH3 is 4-methylpent-3-en-2-one.
Mention two properties of acetonitrile because of which it acts as a good solvent.Marks:1
Acetonitrile is used as a solvent for performing many organic reactions because:– (1) It has high polarity, so, it is capable of dissolving a variety of solvents. (2) It is soluble in water.
Identify and indicate the presence of chirality, if any, in the following molecules. How many stereoisomers are possible for those containing chiral centres?
(i) 3-bromo-pent-1-ene CH2 =CH-CH(Br)-CH2 -CH3
(x) (x) (x) (ii) H3C-CH-CH2-CH-CH3 has two chiral (x) carbon atoms and it will have four stereoisomers. | | OH OH
Draw a diagram showing the formation of bonding and antibonding molecular orbital by the LCAO in homonuclear hydrogen molecule. out of syllabusMarks:2
diagram showing the formation of bonding and antibonding molecular orbitals by the Linear Combination of Atomic Orbitals (LCAO) in homonuclear hydrogen molecule is shown below:-
Taking a specific example show that ∆S total is a criterion for spontaneity of a change.out of syllabusMarks:2
Out of syllabus
Write the cell reactions which occur in lead storage battery (i) When the battery is in use. (ii) When the battery is on charging.Marks:2
The cell reaction occurring in lead storage battery (i) When the battery is in use:– At anode - PbSO4(s) + 2e- → Pb(s) + SO42-(aq) At cathode – PbO2(s) + SO42-(aq) + 4H+(aq) + 2e- → PbSO4(s) + 2H2O(l)
(ii) When the battery is on charging –The reaction is reversed on charging. So, PbSO4(s) on anode and cathode is converted into Pb and PbO2 respectively.
Explain the following terms:
(a) Asymmetric molecule
(b) R and S notationsMarks:2
(a) Asymmetric molecule - When all the four atoms or groups attached to the carbon atom are different, then the molecule is called an asymmetric molecule. e.g. C F Cl Br I (all the 4 halogens are attached to C atom) .The carbon atom is called chiral carbon atom. An asymmetric molecule is known as enantiomers with non- super imposable mirror images. (b) This question is not in 2007-2008 syllabus.