On an X-ray diffraction photograph the intensity of the spots depends on:
neutron density of the atoms/ions
electron density of the atoms/ions
proton density of the atoms/ions
photon density of the atoms/ions
The standard reduction potentials at 298 K for the following half reactions are given against each:
The strongest reducing agents is:
Zn(s)
Cr(s)
H2 (g)
Fe2+ (aq)
In which of the below reaction do we find unsaturated carbonyl compounds undergoing a ring closure reaction with conjugated dienes?
Perkin reaction
Diels-Alder reaction
Claisen rearrangement
Hofmann reaction
B.
Diels-Alder reaction
The addition of unsaturated carbonyl compound, with conjugated diene is called Diel's-Alder reaction.
Identify, which of the below does not possess any element of symmetry?
(+) and (-) tartaric acid
Carbon tetrachlorid
Methane
Meso- tartaric acid
An ion leaves its regular site occupy a position in the space between the lattice sites is called
Frenkel defect
Schottky defect
impurity defect
vacancy defect
How long (in hours) must a current of 5.0 A be maintained to electroplate 60 g of calcium from molten CaCl2 ?
27 h
8.3 h
11 h
16 h
For strong electrolytes the plot of molar conductance vs is
parabolic
linear
sinusoidal
circular
If the molar conductance values of Ca2+ and Cl- at infinite dilution are respectively 118.88 X 10-4 m2 ho mol-1 and 77.33 X 10-4m2 ho mol-1 then that of CaCl2 is ( in m2 ho mol-1):
118.88 X 10-4
154.66 X 10-4
273.54 X 10-4
196.21 X 10-4