What is the correct order of basicity among the following compounds ?
II > I > III > IV
I > II > III > IV
III > I > II > IV
I > III > II > IV
The colourless species is
VCl3
VOSO4
Na3VO4
[V(H2O)6]SO4.H2O
C.
Na3VO4
In Na3VO4, Vanadium is present in +5 oxidation state.
V5+ : 3d04s0, does not have unpaired electron.
Hence, Na3VO4 is colourless species.
Select the correct options from the following :
Graphene is an atomic layer of graphite
Graphene is an atomic layer composed of sp2-hybridised carbon.
Chemical bonds in graphite are similar in strength to that of diamond.
All of these.
Arrange the following nucleophiles in the decreasing order of nucleophilicity :
(A) CH3COO-
(B) CH3O-
(C) CN-
(D)
C, B, A, D
A, B, C, D
C, C, B, A
B, C, A, D
Assertion : The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2.
Reason : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li2O and CO2.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H2SO4.
Reason : Thiophene is a heterocyclic aromatic compound.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Calculate (in S cm2 mol-1) using appropriate molar conductances of the electrolytes listed in the given table
Electrolyte | KCl | KNO3 | HCl | NaOAc | NaCl |
(S cm2 mol-1) |
149.9 | 145.0 | 426.2 | 91.0 | 126.5 |
at infinite dilution in H2O at 25C
517.2
305.0
390.7
217.5