Multiple Choice QuestionsWhich of the following, not a correct statement?
The electron -deficient molecules can act as Lewis acids
The canonical structures have no real existence
Every AB5 molecules does, in fact, have square pyramid structure
Every AB5 molecules does, in fact, have square pyramid structure
C.
Every AB5 molecules does, in fact, have square pyramid structure
Every AB5 molecule does not, in fact, have square pyramidal structure but AB5 molecules have trigonal bipyramidal structures due to sp3d hybridisation.
CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs - 133 and that of Br = 80 amu and Avogadro number being
6.02 x 1023 mol-1, the density of CsBr is:
42.5 g/cm3
0.425 g/cm3
8.25 g/cm3
8.25 g/cm3
D.
8.25 g/cm3
Which of the following is not isostructural with SiCl4?
SCl4
PO43-
PO43-
A.
SCl4
SCl4 is not isostructural of SiCl4 because it shows square planar structure due to the involvement of repulsion between lone pair and bond pair of electrons.
SO42- shows tetrahedral structural due to sp3 hybridization
PO43- shows tetrahedral structural due to sp3 hybridization
NH4+ shows tetrahedral structural due to sp3 hybridisation
A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to:
-log k
n
1/n
1/n
C.
1/n
The empirical relation x/m = kp1/n put forward by Freundlich is known as Freundlich adsorption isotherm. Taking logarithm
If the following curve is plotted
More the number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is:
more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
the lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
the greater metallic character of the lanthanoids than that of the corresponding actinoids
the greater metallic character of the lanthanoids than that of the corresponding actinoids
B.
the lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
A number of oxidation states are exhibited by the actinoids than by the lanthanoids due to the lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals.
The correct regarding the electronegativity of hybrid orbitals of carbon is:
sp> sp2<sp3
sp> sp2 > sp3
sp< sp2 > sp3
sp< sp2 > sp3
B.
sp> sp2 > sp3
The correct order regarding the electronegativity of hybrid orbitals of carbon is sp> sp2 > sp3 because in sp> sp2 > and sp3 hybrid orbitals s- orbital character is 50%, 33.3% and 25% respectively and due to higher s-orbital character electron attraction tendency i,e, electronegativity increases.
The correct order of the mobility of the alkali metal ions in aqueous solution is:
Li+>Na+ > K+ > Rb+
Na+>K+ > Rb+ > Li+
K+ > Rb+ >Na+ > Li+
K+ > Rb+ >Na+ > Li+
D.
K+ > Rb+ >Na+ > Li+
The correct order of the mobility of the alkali metal ions in aqueous solutions
Rb+ > K+ > Na+ > Li+ due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases.
The IUPAC name of is:
3,4-dimethylpentanoyl chloride
1-chloro-1-oxo-2, 3-dimethyl pentane
2-ethyl -3-ethylbutanonyl chloride
2-ethyl -3-ethylbutanonyl chloride
D.
2-ethyl -3-ethylbutanonyl chloride
The general molecular formula, which represents the homologous series of alkanols is:
CnH2nO2
CnH2nO
CnH2n+1O
CnH2n+1O
D.
CnH2n+1O
Alkanols are the derivatives of alkanes which are derived from the replacement of -H of alkanes with -OH (hydroxyl groups)
A solution containing 10 g per dm3 is urea (molecular mass = 60 g mol-1) is isotonic with a molecular mass of this non-volatile solute. The molecular mass of this of this non-volatile solute is:
250 g mol-1
300 g mol-1
350 g mol-1
350 g mol-1
B.
300 g mol-1
10 g per dm3 of urea is isotonic with 5% solution of a non-volatile solute. Hence, between this solution osmosis is not possible so, their molar concentrations are equal to each other,
Thus, molar concentration of urea solution
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