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SECTION 'B' (Short-Answer Questions) (36)
NOTE: Answer any NINE part questions. All questions carry equal marks.
2.
(i) Define any four of the following: *Significant Figure *Rounding Off Data *Bond Energy *Dipole Moment *Stoichiometry
(ii) Calculate the volume of CO2 at 25°C and 780 torr pressure when 12.45 grams of marble is heated: CaCO3 → CaO + CO2 —OR—200 grams of K2Cr2O7 reacted with 200 grams of concentrated H2SO4. Calculate: *Mass of atomic oxygen produced *Mass of reactant left unreacted K2Cr2O7 + 4H2SO4 → K2SO4 + Cr2(SO4)3 + 4H2O + 3[O]
(iii) State Pauli's Exclusion principle. Write the electronic configuration of the following: *Ca++ (Z = 20) *Br− (Z = 35) *Ag (Z = 47)
(iv) Give scientific reasons of any four of the following: * A drop of ink spreads on a blotting paper. * Glycerin is distilled at reduced pressure. * Mercury has its meniscus upward. * HF are greater ionic character then HCl. * Powered zinc reacts more rapidly with HCl than the chunks of metallic zinc.
(v) What is ideal gas? Write the general gas equation. —OR—Write the postulates of Kinetic Molecular Theory of gases.
(vi) One mole of NH3 gas occupies the volume of one dm3 at 25°C. assuming NH3 as a real gas, determine its pressure, while: a = 4.170 dm6 atm mol−2 b = 0.0371 dm3 / mol
(vii) State Le-Chatelier's Principle in Haber's process: N2 + 3H2 ⇌ 2NH3 (ΔH = -ve)
(viii) Explain Lewis Theory of acids and bases with example.
(ix) State Raoult's Law and derive its mathematical expression.
(x) A glucose solution contains 0.15 mole of Glucose and 5.8 moles water at 20°C. Determine the lowing in the vapour pressure if vapour pressure of pure solvent at 20°C is 17.5 torr(assume solution is an ideal)
(xi) Explain the effect of the following factors on rate of a chemical reaction. *Concentration of reactant *Temperature
(xii) Explain Buffer solution and write its applications.
(xiii) If 255cm3 oxygen gas is collected over water at 25°C and a total pressure of 785 torr. Than find the mass of dry oxygen gas (P. essure of water vapour at 25°C is 24 torr)
(xiv) Draw molecular orbital diagram of O2 molecules. Write molecules orbital configuration and determine its bond order.
SECTION 'C' (Detailed Answer Questions)(32)
NOTE: Attempt any Two questions from this section. All questions carry equal marks.
3.
(a) what are X-rays? How are they produced? Give any four properties of X-rays also derive an expression for the energy of electrons in nth orbit according to Bohr's Model of atom when: r = ε0 n2 h2Z π m e2
(b) State Law of Mass Action. Derive an expression of equilibrium constant Kc for general reversible reaction: aA + bB ⇌ cC + dD Find equilibrium constant when 2.94 moles of Iodine and 8.1 moles of hydrogen were mixed and heated at 444°C until the equilibrium was established 5.64 moles of HI were formed: H2 + I2 ⇌ 2HI
4.
(a) Discuss the shapes of the following molecules with the help of hybridization and VSEPR. *BF3 *BeCl2 *NH3
(b) Differentiate any three of the following: * Principal Quantum Number and Azimuthal Quantum Number. * Bonding Molecular Orbitals and Anti Bonding Molecular Orbital. * Sigma Bond and Pi Bond. *Isomorphism and Polymorphism
5.
(a) Explain the properties of water, based on hydrogen bonding? Write the properties of crystalline solid.
(b) Describe the types of colloids. Write their properties. A certain reaction A + B → Product gave the following results:
| Exp. No. | Initial Conc. mole/dm3 | Initial rate mole/dm3.s | |
| [A] | [B] | ||
| 1 | 1.0 × 10-6 | 9.0 × 10-6 | 1.98 × 10-4 |
| 2 | 2.0 × 10-6 | 9.0 × 10-6 | 3.96 × 10-4 |
| 3 | 1.0 × 10-6 | 3.0 × 10-6 | 6.6 × 10-5 |
On the basis of above results find the Rate Law and the order of reaction.
--OR--Write note on any one of the following: *Viscosity *Surface Tension *London Dispersion Forces
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