Exam (elaborations)
1st Year Chemistry Target Paper
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1styears Chemistry Important Target Paper. 80% of the questions are confirmed to come in Board Examination and important questions also for Olevel preparation
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CHEMISTRY PAPER-ISECTION ‘B’
(SHORT- ANSWERS QUESTIONS) 32-marks
NOTE: Attempt any eight parts from this section. All questions carry equal marks 04. The
use of scientific calculator is allowed. Draw diagram where necessary.
(Atomic Mass: Carbon (C) = 12a.m.u, Hydrogen (H) = 1a.m.u, Chlorine (Cl) = 35.5a.m.u.
Oxygen (O) = 16a.m.u. Sulphur (S) = 32a.m.u. Argon (Ar) = 39.9a.m.u. Nitrogen (N) =
14a.m.u. Tin (Sn) = 118.71a.m.u. Bismuth (Bi) = 208.98a.m.u.
2. (i) Define any four of the following with examples or mathematical expression
where necessary:
(a) Latent heat of fusion (b) Stoichiometry (c) Unit cell
(d) Oxidation number (e) Avogadro’s number (f) Enthalpy
(g) Mole (h) Limiting reactant (i) Precision
(ii) Nicotine, an alkaloid in the nightshade family of plants that is mainly
contains 74.02% C, 8.710% H, and 17.27% N. If 40.57 g of nicotine contains
0.2500 mol nicotine, what is the molecular formula?
OR
2.278 x 10-4 mol of an unidentified gaseous substance effuses through a tiny
hole in 95.70 sec. Under identical conditions, 1.738 x 10-4 mol of argon gas
takes 81.60 sec to effuse. What is the molar mass of the unidentified substance?
OR
What volume of CO2 measured at 20ºC and 720 torr pressure will be produced by the
reaction between 200 g of Na2CO3 and HCl.
Na2CO3 + 2HCl → 2NaCl + CO2 + H2O
(iii) Differentiate between any two of the following pairs with the help of four points
for each pair.
a. Atomic orbital and Molecular orbital.
b. Continuous spectrum and line spectrum.
c. Hydration and Hydrolysis.
d. Sigma and Pi bond.
e. Valence bond theory (VBT) and molecular orbital theory (MOT)
f. Crystalline and Amorphous solids.
g. Intensive and Extensive properties.
h. Polymorphism and Isomorphism.
i. Exothermic and Endothermic reaction.
(iv) (a) What is the pOH of a 6 x10-7 M aqueous solution of HCl?
(b) Find the wavelength of the electromagnetic radiation that is emitted from an
electron that relaxes from n = 3 to n = 1.
(v) What are Quantum Numbers? Explain them with the example of each sub-shell.
OR
(a) Which principle is violated in the following configurations?
*1s22s12p5 *1s22s32p5
(b) write down the electronic configuration of the following;
* Rb1+ (Z=37) *Cu2+ (Z= 29) *Cl-1 (Z=17)
(vi) What is ‘The Common Ion Effect’? Explain the solubility of ‘Group II’ and ‘Group
IV’.
OR
Write down the postulates of Arrhenius Theory of Ionization.
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