Inter (Part-I)
Gujrawala Board 2013
Chemistry Paper: I
Time: 20 Minutes
Marks: 17

OBJECTIVE

Note: you have four choices for each objective type question as A, B, C, and D. The choice which is correct, fill that circle in front of that question number with market or pen on the answer book provided. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many question as given in objective type question paper and leave other blank.

• The mass of one mole of electron is:

(A) 008 mg
(B) 0.55 mg
(C)184 mg
(D) 1.673 mg

• One mole of SO₂ consists of :

(A) 6.02 x 10²³ atoms of oxygen
(B) 18.1 x 10²³ molecules of SO_²
(C) 6.02 x 10²³ atoms of sulphur
(D) 4 gram atoms of SO₂

• Solvent extraction method is particularly useful technique for separation when the product to be separated:

(A) non –volatile or thermally unstable
(B) volatile or thermally stable
(C) non-volatile or thermally stable
(D) volatile or thermally unstable

• Pressure remaining constant at which temperature the volume of a gas will become twic of what it is at 0^oC?

(A) 546oC
(B) 200oC
(C) 546 K
(D) 273 K

• When water freezes at 0^oC, its density decreases due to?

(A) empty spaces present in the structure of ice
(B) cubic structure of ice
(C) change of bond lengths
(D) change of bond angles

• Diamond is a bad conductor of electricity because:

(A) it has a tight structure
(B) it has a high density
(C) there is no free electron present in the crystal of diamond to conduct electricity
(D) it is transparent to light

• Splitting electric field is called L

(A) Zeeman effect
(B) Stark effect
(C) photoelectric effect
(D) Compton effect

• In ground state of an atom the electron, is present:

(A) in the nucleus
(B) in the second shell
(C) nearest to the nucleus
(D) farthest from the nucleus

• Which molecule has zero dipole moment?

(A) NH₃
(B)CHCℓ₃
(C) H₂O
(D) BF₃

• Which species has unpaired electrons in antibonding molecular

(A) O_ֻ²⁺
(B) O_ֻ²⁺
(C) B₂
(D) F₂

• The change in heat energy of a chemical reaction at constant temperature and pressure is called?

(A) enthalpy change
(B) heat of sublimation
(C) bond energy
(D) internal energy change

• An excess of aqueous sliver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate?

(A) Ag⁺ and Ba²⁺ and NO₃^-
(B) Ag⁺ and No₃^- only
(C) Ba²⁺ and NO₃^- only
(D) Ba²⁺ and NO₃^- and Cℓ^-

• For which system does the equilibrium constant K_c has unit of (concentration)^-1

(A) N₂ + 3H₂NH₃
(B) H₂ + I₂ 2H1
(C) 2NO₂N₂O₄
(D) 2HF H₂ + F₂

• 18 g glucose is dissolved in 90 g of water . the relative lowering of vapour pressure is equal to:

(A) 1/5
(B) 5.1
(C) 1/51
(D) 6 

• Stronger the oxidizing agent, greater is the:

(A) oxidation potential
(B) reduction potential
(C) redox potential
(D) E.M.F of cell

• If a strip of Cu metal is placed in a solution of FeSo₄:

(A) Cu will be deposited
(B) Fe is precipitated out
(C) Cu and Fe both dissolve
(D) no reaction occurs

• The unit of the rate constant is the same as that of the rate of reaction in :

(A) first order reaction
(B) second order reaction
(C) Zero order reaction
(D) third order reaction

Inter (Part-I)
Gujranwala Board 2013
Chemistry Paper: I
Time : 3:10 Hours
Marks: 83

SUBJECTIVE

2. Write short answers to any EIGHT question: (2x8=16)

• N₂ and CO have same number of electrons, protons and neutrons. Justify.
• Define the term molecule Give two examples also.
• No individual neon atom in the sample of the element has a mass of 20.18 amu. Explain with reason.
• Explain sublimation. Give two example.
• What do you know about R_f value of a component in paper chromatography?
• Derive the units for gas constant R in general gas equation when pressure is in Nm^-2 and volume in m3.
• Water vapurs do not behave ideally at 273 K. Explain
• State Boyle’s law of gases.
• One feels sense of cooling under the fan after bath.
• Heat of sublimation of iodine is very high although it is a molecular solid. Give reason.
• Diamond is hard and an electrical insulator. Give reason.
• Ionic crystals are highly brittle . Explain with reason.

3. Write short answers to any EIGHT question. (2x8=16)

• The radius of first orbit of hydrogen atom is 0.529 Ao Caculate the radius of 3^rd orbit of hydrogen atom.
• Whichever gas is used in the discharge tube, the nature of the cathode rays remains the same. Why?
• What are the defects in Rutherford’s atomic model?
• Write the electronic configuration of Cr for which atomic number is 24.
• Sketch the molecular orbital picture of O_{2 .}
• Separate the following molecules as polar or non-polar. CO₂ (ii) CH₃OH (iii) CCℓ₄ (iv) HF
• Define bond energy with two parameters which determine its strength .
• Why ionization energy decreases down the group although the nuclear charge increase?
• What is state and state function? Explain with example.
• State enthalpy of combustion with example.
• Why during the synthesis of NH3 temperature is kept low?
• Define solubility product with example.

4. Write short answers to any SIX questions: (2x6=12)

• What will be the effect of increase of pressure and temperature of the following reaction? N_{2 (g)} + 3H_2(g)2NH_3(g) H = -92.46 KJ
• Define molal boiling constant with an example.
• Why ethylene glycol is added in radiator of automobile?
• Why aqueous solution of sodium acetate is alkaline in nature
• How electrochemical series help us in determining the chemical reactivity of metals?
• Balance the following equation by Redox method? HNO₃ + HI NO + 1_{3 +} H₂ O
• Write electrode reaction of electrolysis of fused sodium chloride.
• Define autocatalysis with an example.
• How surface area affects the rate of a chemical reaction?

(Section –II)

5.a) What are liquid crystals? Give three use in daily life. (4)
b) A well-Known ideal gas is enclosed in a container having volume 500 cm3 at S.T.P. Its mass comes out to be 0.72 g. What is the molar mass of this gas? (4)

6.a) What is hybridization? Discuss sp² hybridization with example. (4)
b) Define enthalpy of neutralization also discuss glass calorimeter pressure. (4)

7.a) Write down four applications of Dalton’s law of partial pressure. (4)
b) Derive an expression for the radius of nth Bohr’s orbit of H. Atom. (4)

8.a) What is electrochemical series? Give its applications. (4)
b) What is solubility product? The solubility of CaF₂ in water at 25^o C is found t be 2.05 x 10^-4 mol dm ^-3. What is the value of K_sp at this temperature? (4)
(Atomic Mass of Ca =40, F = 19)

9.a) What are azeotropic mixture ? Explain them with the help of graphs. (4)
b) Write a detailed note on activation energy. Explain with graphs. (4)

(Section-II)
(Practical)

Attempt any three part. 3 x 5 = 15

(i) Write down standard solution, chemical equation with mole ratio, indicator with end point procedure and calculation wit supposed readings for part A, B, and C. (1+1+1+1+1)

(ii) Write down material required, diagram and procedure for part D and E. (1+1+3)

(A) 4.9 g of a dibasic acid has been dissolved per dm3 .Determine the molecular weight of the acid. (5)
(B) The given solution contains 5.0 g of impure KMnO₄ dissolved per dm3. Determine the percentage purity of sample. (Molecular mass of KMnO₄ = 158)
(C) 12.4 g of Na₂ S₂O₃. x H₂O has been dissolved per 500 ml of solution. Fid the number of molecules of water crystallization. (Molecular mass of Na₂S₂O₃ = 158)
(D) Separate the given mixture of inks by paper cfromatography.
(E) Purify the iven sample of benzoic of bezoic acid by crystallization.