CHEMICAL BONDING & BALANCING REDOX REACTIONS(TALENT HUNTER) 1.
Which of the following are isoelectronic and isostructural? (a) NO2+ CO2 (b) NO3- , BF3
2. (a) (b) (c) (d)
N2 →N2+ O2+ →O2+2 B2 →B2+ NO- →NO (A) (B) (C) (D)
a S S R P
(P) (Q) (R) (S) b P P Q S
(c) NH3,CH3-
(d) all of these
Bond order increases and magnetic property is changed Bond order decreases and magnetic property is not changed Bond order increases and magnetic property is not changed Bond order decreases and magnetic property is changed c R Q S Q
d Q R P R
3.
In the structure of H2CSF4 to decide the plane in which C=S is present the following bond angle values are given. Axial FSF angle = 1700. Equatorial FSF angle = 970. After deciding the plane of double bond, which of the following statement is correct? (a)Two C-H bonds are in the same plane of axial S-F bonds. (b) Two C-H bonds are in the same plane of equatorial S-F bonds (c) Total five atoms are in the same plane (d) Equatorial S-F bonds are perpendicular to the plane of π – bond
4.
Which of the following is true related to structure of KrF 4 (a) It has one lone pair on the central atom (c) It is square planar
5.
(b) Bond angle is more than 1090 (d) Molecule is polar
The following equations are balanced (i) Cr2O72- + 8H+ + 3H2O2 → 2Cr3+ + 7H2O + 3O2 (ii) Cr2O72- + 8H+ + 5H2O2 → 2Cr3+ + 9H2O + 4O2
(iii) Cr2O72- + 8H+ + 7H2O2 → 2Cr3+ + 11H2O + 5O2 The precise equation representing the complete oxidation of hydrogen peroxide is (a) I only (b) ii only (c)iii only (d) all the three 6.
In the reaction CrO5 + H2SO4 →Cr2(SO4)3 + H2O + O2. One mole of CrO5 will liberate how many moles of O2 (a)5/2 (b)5/4 (c)9/2 (d) none of these
7.
Which of the following the correct order of boiling point? (a) H2O < CCl4
(b) CO2< CS2
8.
A diatomic molecule has a dipole moment of 1.2 D. if its bond length is equal to 10 -10m, then the fraction of an electronic charge on each atom will be (a) 42% (b)52% (c)37% (d)25%
9.
According to molecular orbital theory which of the following is incorrect (a) LUMO level for C2molecule is π2py (b) in C22- molecule two of the bonds are bonds 2(c) C2 as well as C2 are diamagnetic (d) in C2 molecule both the bonds are π bonds.
10. Which of the following is correct? (a) (CH3)3COH is less acidic than (CH3)3SiOH (b) Like CO, its analogue of Si is not stable (c) In phosgene C-O bond length is longer than expected while C-Cl bond length is shorter (d) All of these 11. Which of the following pairs of species have identical shapes? (a) NO2+ and NO2(b) PCl5 and BrF5
(c)XeF4 and ICl4-
(d)TeCl4 and XeO4
12. The strongest P-O bond is found in the molecule (a) F3PO (b)Cl3PO
(c)Br3PO
(d)(CH3)3PO
13. O2F2 is an unstable yellow orange solid and H2O2 is a colourless and O2F2 respectively is (a) 1.22 Ao, 1.48Ao (b) 1.48Ao, 1.22 Ao 14. The S-O bond length is maximum in (a)SOCl2 (c)SOF2 15. Number of S-S bond in H2SnO6 is (a) n
(b) n-1
liquid, both have o-o bond and o-o bond length in H 2O2 (c) 1.22 Ao , 1.22 Ao
(d) 1.48Ao1.48Ao
(b)SOBr2 (d)all have the same bond length (c)n-2
(d)n+1
16. Select pair of compounds in which both have different hybridisation but have same molecular geometry (a)BF3 BrF3 (b) ICl2- BeCl2 (c)BCl3, PCl3 (d)PCl3,NCl3 17. The correct increasing order of extent of hydrolysis is (a)CCl4
(c)CCl4
(b)BF3
(b) CCl4
(d)PCl2F3
19. Which of the following statements is not correct regarding bonding molecular orbitals? (a) bonding molecular orbitals possess less energy than the atomic orbitals from which they are formed (b) bonding molecular orbitals have low electron density between the two nuclei (c) electron in bonding molecular contributes to the attraction between atoms (d) they are formed when the lobes of the combining atomic orbitals have the same sign H2C
CH2 20. Nodal planes of π bond(s) in are located in (a) all are in molecular plane (b) two in molecular plane and one in a plane perpendicular to the molecular plane which contain s C-C sigma bond (c) one in molecular plane and two in a plane perpendicular to molecular plane which contains C-C sigma bonds (d) two in molecular plane and one in a plane perpendicular to molecular plane which bisects C-C sigma bonds at right angle
NUMERICALS The bond order of the underlined species in NOHSO4 is How many hydrogen bonded water molecule(s) are associated in CuSO4.5H2O. Dichromate ion in acidic medium oxidizes stannous ion as xSn2+ + y Cr2O72- + zH+→aSn4+ + bCr3+ +c H2O. the value of Z-C is B3N3H6 is converted in to B3N3H4X2 by the replacement of H. how many structures are possible? How many of the following compounds contain bond(s) between sulphur atoms S2O32- , S2O42-,S2O52-,S2O72How many of the following statements are correct? (a) It is impossible to satisfy the octet rule for all the atoms in xenon diflouride (b) The bond in NO+ should be stronger than the bond in NO(c)Crystals of hydrated calcium sulphate can be easily cleaved (d) N2F3+ is planar at each nitrogen atom (e) SeOCl2 has a lone pair and a double bond How many of the following species are not isostructural with CO2
HgCl2, SnCl2,C2H2,NO2,Cyanamide ion, CS2 Stable Lix exists in vapour state. The value of x is For N2H2 how many isomeric structures are possible(both structural and stereo) In the molecule SF6, the maximum number of atoms present in one single plane is
ANSWER KEY: 1. D
2. B
3.A
4.C
5.A
6. D
7. B
8. D
9.A
10.D
11. D
12.A
13.B
14.B
15.B
16. B
17A
18.D
19.B
20.B
N1. 3
N2.2
N3.7
N4. 4
N5. 3
N6. 5
N7. 2
N8.2
N9.3
N.10. 5
