Lessons:1,2,3,4
Chemistry
1Mark
75 Marks
1X15=15
1.The bond order of oxygen molecule is
a) 2.5 b) 1 c) 3 d) 2
2. The hybridisation in SF6 molecule is
a) sp3 b) sp3d2 c) sp3d d) sp3d3
3. The intramolecular hydrogen bonding is present in
a) o-nitrophenol b) m-nitro phenol c) p-nitrophenol d) None
4. Electron affinity is expressed in
a) kJ b) J c) kJ mol d) kJ mol-1
5. The bond length of Cl2 molecule is
a) 0.74 b) 1.44 c) 1.98 d) 2.28
6. The order of ionization energy
a) s < p < d < f b) s > p > d > f c) s > d > p > f d) s<d<p<f
7. Across the period, electron affinity
a) decreases b) increases
c) decrease and the increases d) increase and then decreases
8. Noble gases have _____electron affinity
a) High b) Low c) Zero d) Very low
9. Which of the following does not belong to group 13?
a) B b) Al c) Ge d) In
10. Which of the following is most abundant in earth’s crust?
a) C b) Si c) Ge d) Sn
11.An element which was burnt in limited supply of air to give oxide A which
on treatment with water gives an acid. B. Acid B on heating gives acid C
which gives yellow precipitate with AgNO3 solution A is
a) SO2 b) NO2 c) P2 O3 d) SO3
12. The compound with garlic odour is
a) P2 O3 b) P2O5 c) H3PO3 d) H3PO4
13. The chemical composition of slag formed during the smelting process in
the extraction of copper is
a) Cu2O + FeS b) FeSiO3 c) CuFeS2 d) Cu2S + FeO
14. The transition element with the lowest atomic number is
a) Scandium b) Titanium c) Zinc d) Lanthanum
15. Which transition element show highest oxidation state
a) Sc b) Ti c) Os d) Zn
3 Marks
10X3=30
1.State Heisenberg’s uncertainty principle.
2.What are molecular orbitals.
3.Why is He2 not formed?
4.Mention the disadvantage of pauling and mulliken scale.
5.why is the electron affinity of fluorine less than that of chlorine?
6. The electron energy of hydrogen atom in the ground state works out to be
–2.18 10-18 J per atom. Calculate what will happen to the position of the
electron in this atom if an energy of 1.938 10-18J is supplied to the each hydrogen
atom.
7.Distinguish electron affinity and electronegativity.
8.prove that P2O5 is a powerful dehydrating agent.
9.H3PO3 is diprotic.Why?
10.Explain why d-block elements exhibit variable oxidation states.
11.What is the action of heat on copper sulpate crystals?
12.Explain why Mn2+ is more stable than Mn3+?
5Marks
5 X3=15
1. Explain briefly the extraction of copper from its chief ore.
2.Name the ores of gold .Explain how it is extracted from its alluvial gravel.
3. Separation of noble gases (Dewar’s method)
4. Salient Features regarding Hybridisation.
10Marks
5X3=15
1.a) Molecular orbital energy level diagram of O2 molecule
b) Calculate the electronegativity values of fluorine and chlorine on Mulliken’s
scale, given that (Ionisation potential) F = 17.4 eV/atom (Electron affinity) F =
3.62 ev/atom, (IP)Cl = 13.0 ev/atom and (EA)Cl = 4.0 ev
2.a)Explain the Applications of electronegativity. (or)
b)Explain the Silicones – structure and uses