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)
A.
Zn(s)
The substances which have lower reduction potentials are stronger reducing agent. The reduction potential of zinc is lowest among these hence, it is the strongest reducing agent.
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
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