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Inorganic Chemistry (Part-II) - Most Important Questions! (Download PDF)
1. In a molecule of pyrophosphoric acid, the number of P-OH, P = O and P - O - P bonds/moiety(ies) respectively are:
- 3, 3 and 3
- 4, 2 and 1
- 2, 4 and 1
- 4, 2 and 0
2.Excess of PCL5 reacts with conc. H2SO4 gives
A. Sulphuryl chloride
B. Sulphurous acid
C. Cholosulphonic acid
D. Thionyl chloride
3. SO3 on combining with HCl gives -
A. Chloro sulphonic acid
4. The number of sigma and pi bonds in peroxydisuphuric acid are, respectively
A. 9 and 4
B. 11 and 4
C. 4 and 8
D. 4 and 9
5. Which of the following compounds can form silicones on hydrolysis?
D. All of these
6. Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated?
A. IF7: pentagonal bipyramid
B. BrF5: trigonal bipyramid
C. BrF3: Bent T-shaped
D. ICl3: Bent T-shaped
7. The isoelectronic set of ions is :
A. F-, Li+, Na+ and Mg2+
B. N3-, Li+, Mg2+ and O2-
C. Li+, Na+, O2- and F-
D. N3-, O2-, F- and Na+
8. Select a pair of compounds in which both have different hybridization but have same molecular geometry.
A. BF3, BrF3
B. ICl2, BCl2
C. BCl3, PCl3
D. PCl3, NCl3
9.The actinoids exhibit more number of oxidation states in general than the lanthanoids because
A. The 5f orbitals extend further from the nucleus than the 4f orbitals
B. The 5f orbitals are more buried than the 4f orbitals
C. There is a similarity between 4f and 5f orbitals in their angular part of the wave function.
D. The actinoids are more reactive than lanthanoids
10. Which of the following statements supports the lanthanoid contraction?
A. Filling of 4f orbital before filling 4d orbital
B. Filling of 4f orbital before filling 5d orbital
C. Imperfect shielding of 4f electrons
D. Both B and C
P – OH bonds = 4
P = O bonds = 2
P – O – P linkage = 1
SO3 + HCl → SO2.(OH)Cl
Chloro sulphonic acid
Peroxodisulphuric acid, H2S2O8
(CH3)2SiCl2 on reaction with water forms silicones by reaction:
(CH3)2SiCl2 + H2O Ã (CH3)2Si(OH)2 + HCl
Pentagonal bipyramid structure of IF7
BrF5 has a square pyramidal shape.
Bent T-shaped structure of BrF3 :
T-shaped structure of ICl3
hence option 2 is correct.
Isoelectronic elements are those which have a same number of electrons.
F– : 10 electrons
Li+ : 2 electrons
Na+ : 10 electrons
Mg+2 : 10 electrons
O2– : 10 electrons
N3– : 10 electrons
shielding effect of 5f < shielding effect of 4f
so Zeff (z effect) in actinoids < Zeff (z effect) in lanthanoid
so, extraction of electrons in actinoid is easier than lanthanoid which has 4f and better shielding.
Lanthanoid contraction arises due to the imperfect shielding of 4f electrons and also the filling of 4f orbital before filling 5d orbital. This imperfect shielding of 4f electrons results in the nuclear attraction to reach the outer orbital than that expected. This results in the contraction of the atoms outer shell due to increased attraction. This effect is termed as Lanthanoid contraction.
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