Consider
the decomposition of in
alkaline medium which is catalyzed by iodide ions.
This
reaction takes place in two steps :
1st
step:
(a)
What is the molecularity of each individual
step? 1
(b)
Write the rate law expression and determine the order of reaction w.r.t. . 1
An
aromatic compound (A) on treatment with ammonia followed by heating forms
compound (B) which on heating with and forms a
compound (C) having molecular formula (). Give
the structure of A, B and C. Write the equation involved. 2
Give
reasons :
(a)
Rusting of iron pipe can be prevented by joining it with a piece of
magnesium. 1
(b)
Conductivity of an electrolyte solution decreases with the decrease in
concentration. 1
Give
one example of each of the following :
(a)
An artificial
sweetner. 1
(b)
A non-ionic
detergent. 1
(c)
A pain reliever used for relief from post-operative
pain. 1
(a)
Arrange the following polymers in the increasing order of tensile strength :
.
1
(b)
(i) Give one example of a synthetic rubber and mention its main
advantage. 1
(ii)
Write the structure of monomers of Dacron. 1
(a)
What is the role of depresent in froth floatation
process? 1
(b)
Out of which
is better reducing agent for:
(i)
In the lower part of blast furance (Higher temperature) 1
(ii)
In the upper part of blast furance (Lower temperature). 1
Assign
a reason for each of the following statements :
(i)
Phosphorus () is more
reactive than nitrogen ().
1
(ii)
Sulphur in vapor state exhibits paramagnetism.
1
(iii)
Conc. turns
yellow on exposure to sunlight. 1
An
organic compound A ()
is resistant to oxidation but from compound B () on
reduction. B reacts with to form
the compound C. C with forms
Grignard reagent D which with A to form a product which on hydrolysis gives E.
Identify A to E. 3
Show
graphically that the freezing point of a liquid will be depressed when
non-volatile solute is dissolved in it. The freezing point of a solution
containing 0.3 gm of acetic acid in 30.0 gm of benzene is lowered by 0.45°C.
Calculate the Vant Hoff factor. 5
( for
benzene = 5.12 )
(a)
Give reasons ;
(i)
The highest oxidation state of a metal is exhibited in oxides and
fluorides. 1
(ii)
With configuration
in is
reducing whereas in is
oxidizing. 1
(iii)
Transition element has high heat of atomization.
1
(b)
Complete the following reaction:
(i)
1
(ii) 1