Chemistry
(New Scheme)
Inter Part-I
Gujranwala Board 2016
Paper: I
Time:20 Minutes
Objective
Marks:17

Note: you have four choices for each objective type question as A, B, C and D.The choice which you think is correct, fill that circle in front of that question number. Use marker to fill the circles. cutting or filling two or more circles will result in zero mark in that question.Attempet as many questions as given in objective type question paper and leave others blank.

Q: 1

• If the rate equation of a reaction A+2B→products is, rate=K|A||B|² and A is present in large excess, then order of reaction is:

(A) 1
(B) 2
(C) 3
(D) Pseudo 1^st order

• The molal boiling point constant is the ratio of the elevation in the boing point to :

(A) Molarity
(B) Molality
(C) Mole fraction of solvent
(D) Mole fraction of solute

• For witch system does the equilibrium constant, Kc has units of (concentration) ^-1?

(A) N₂+3H₂→NH₃
(B) H₂+I₂→2HI
(C) 2NO₂→N₂O₄
(D) 2HF→H₂+F₂

• The number of bonds in N2 molecule is:

(A) One sigma and two pi
(B) One sigma and oneb pi
(C) Three sigma only
(D) two sigma and one pi

• Which particle has greater wavelength?

(A) Electron
(B) Proton
(C) Neutron
(D) ᾳ-particle

• Vapour pressure of a substance does not depend upon:

(A) Temperature
(B) Intermolecular forces
(C) Surface area
(D) physical state of matter

• A real gas obeying van der waals equation resemble ideal gas if:

(A) Both ‘a’ and ‘b’ are large
(B) ‘a’ is small and ‘b’ is large
(C) ‘a’is large and ‘b’is small
(D) Both ‘a’ and ‘b’ are small

• The word porosite means:

(A) Size of pores
(B) Number of pores
(C) Quality of pores
(D) Nature of pores

• One mole of SO₂ contains:

(A) 6.02*10²³ atoms of oxygen
(B) 1.81*10²³ molecules of SO₂
(C) 6.02*10²³atoms of sulphur
(D) 4 gram atoms

• 10.In witch of the following oxidation number of Cr is not +6:

(A) Cr₂O²-₇
(B) K₂Cr₂O₇
(C) Cr₂(SO₄) ₃
(D) K₂CrO₄

• sum of pK_a and pK_{b is} equal to :

(A) 14
(B) 7
(C) 0
(D) 1

• Which one of the following molecule is paramagnetic?

(A) H₂
(B) He
(C) N₂
(D) O₂

• the wave number of light emitted by a certain source is 2x10⁶m^-1.the wavelength of this light will be :

(A) 5x10⁷m
(B) 200nm
(C) 500m
(D) 500nm

• which is not a state function?

(A) enthalpy
(B) work
(C) pressure
(D) temperature

• Down the VII-Agroup,polarizability generally:

(A) decreases
(B) increases
(C) remain the same
(D) unpredictable

• If absolute temperature of a gas is doubled and the pressure is redused to obne half,thevolume of a gas will:

(A) remain unchanged
(B) reduce to1/4
(C) increases four times
(D) be doubled

• The number of moles of CO₂ which contains 8.0g of oxygen:

(A) 0.25
(B) 0.50
(C) 1.0
(D) 1.50

Chemistry
Inter Part-I
Gujranwala Board 2016
Paper: I
Time:2.40 Hours
Subjective
Marks:68

Note: Section I is compulsory.Attempt any three (3) questions from section II.
(SECTION-I)

2. Write short answers to any Eight questions: (2x8=16)

• Why law of conservation of mass has to be obeyed during stoichiometric calculations?
• Why many chemical reactions taking places in our surroundings involve the limiting reactants?
• Why do individual Neon atom in the sample of neon element has the mass of 20.18amu?
• Differentiate between stationary phase and mobile phase in chromatographic technique?
• How is desiccator used to dry the crystals?
• Why dalton’s law of partical pressure of gases is only obeyed by those gases which do not have attractive forces omong the molecules?
• How kinetic energy of molecules of a gas become zeroat -273^oc?
• What do you mean by natural plasma and artificial plasma?
• What is ph of asolution?write folmula to calculate phof a solution .
• Why reversible reactions attain the position equilibriumwhich is dynamic and not the static?
• Why freezing pointsof solvents are depressed due to presence of solutes in their solution?
• Why colligative properties of solution are obeyed when solute is non electrolyte and also when the solution are dilute?

3.write short answers to any eight questions: (2x8=16)

• Why HF has less acidic strength than HI?
• Why heat of sublimation of iodine is very high?
• Why molar heat of vaporization (∆H_V) is grater than molar heat of fussion (∆H_f) ?
• Why diamond is hard and an electrical insulator?
• Calculate wave number value of lyman series when n₁=1and n₂=3.
• Define pauli’s exclution principle.
• Why e/m value of the cathode rays is just equal to that of electron?
• Give electronic configuration of la-57 and Cr-24.
• Define solubility with one example
• Calculate oxidation number of ‘Mn’ in KMnO_4.
• Define electrolysis with one example.
• A salt bridge maintains electrical neutrality in the cell,define.

4. Write short answer to any six questions: (2x6=12) Define ond with an example.

• Explain that helium is diamagnetic.
• Molecular orbitaltheory is superior to valence bond theory.explain.
• Sigma bond is stronger is pi-bond.explain.
• Differentiate between exothermic and endothermic reactions.
• Describe system and surrounding.
• Give two characteristics of enzyme catalysis.
• Define energy of activation. how is it affected by temperature?
• Differentiate between rate and rate constant of a reaction.

SECTION-II

5. (a) Serotonin (molar mass =176g mole^-1) is a compound that conducts nerve impulses in brain and muscles.it has 38.7%carbon,9.7%hydrogen and 51.6%oxygen.its molecular mass is 62.1grams mole^-1.determine its molecular formula. (4)

6. (a) State and explain Gharam’s law of diffusion of gases.(4)

7. (a) Write four postulates of valence shall electron pair repulsion theory.(4)

8. (a) Calculate the ph of a buffer solution in which 0.11 molar CH₃COONaand 0.09molar acetic acid solutions are present.K_a4 acetic acid is 1.85x10^-5.(4)

9. (a) State raoult’s law and dertive its three different forms.(4)