1st year chemistry paper 2019 federal board

NVre. The Questions oF sections 6, C and D are to be answered on the separately provided answer book.1st year chemistry paper
~ Use supplementary answer sheet i.e. Sheet-8 if required. Write your answers neatly and legibly.
SECTION — B (i
~ {Chapters 1 to 6)
_ Q.2 > Answer any SEVEN parts. All parts carry equal marks. (? x3 © 21)
_ 0) Calculate the number of molecules of O, produced by thermal decomposition of 490 g KClO,.
(Atomic masses K =39 g/mol , Ci=35.5 g/mol, O=16 gi mol)
_ (ii) Define limiting reactant. Why is the concept of limiting reactant not applicable to the reversible
teactions?
—_ (it) Calculate the mass of an electron with the help of its charge and e/m ratio.
{iv) Explain the geometries of PbC/, & SO, on the basis of VSEPR theory.
~ (v} Write down the defects cf Valence bond theory.
_ (iy Draw molecular orbital diagram for V, molecule and calculate its bond order.
(vii) What is an isotherm? How is it affected by change in temperature? Give reason.
_ (vill) Write down any three uses of liquid crystals.
(ix) Define lattice energy giving an example. Write down the factors affecting the lattice energy.
_ 9) What is cleavage plane? Give an example. Why is cleavage an anisotropic property?
ECTION -C (Marks 21
~ (Chapters 7 to 12)
—~ Q.3 Answer any SEVEN parts. All parts carry equal marks. (7 x3 2 24)
@ State common ian effect and give an example
~~ (il) Justify that CaO is a basic oxide whereas 4/0, is an amphoteric oxide.
_ (iil) Define buffer solution. Write down its types, giving one example for each.
(iv) What is a first order reaction? Give two examples.
_ (v) Differentiate between hydrophilic and hydrophobic molecules, giving one exampie of each.
(vi) Define molarity, molality and mate fraction.
_ (vii). Write down any three properties of colvids.
(viii} © What is the internat energy of a system? Justify that internal energy is a state function.
(ix) Define enthalpy of atomization, enthalpy of solution, enthalpy of neutralization
~ 9 What is galvanizing? How does it protect iron from corrosion?

1st year chemistry paper 2019 federal board
1st year chemistry paper 2019 federal board

SECTION ~ D (Marks 26


~— SECTION ~ D (Marks 26
Note: Attempt any TWO questions. All questions carry equal marks. (13 x 2 = 26)
~ {Question 4 from Chapters 1 to 6)
— a4 oa Derive general gas equation. How can this equation can be modified to determine the molar mass
_ and density of a gas? {06)
b. Define London dispersion forces. How are these forces produced in Helium gas? Also
— describe the factors affecting the London dispersion forces. (141.5445)
= (Question 5 from Chapters 7 to 12)
— Qs a State Le-Chatlier’s principle. Apply this principle to describe the effects of decrease in
concentration of SO, , increase in temperature and increase in pressure on the following reactions

a ; | a. : _ 7 le 7 . mn _ : 7 ; _
_ concentration of SO, , increase in temperature and increase in pressure on the following reactions
at equilibrium 250, + O, = 280, AH = -198 kj mol (1+6)
b. Define catalysis. How does a catalyst increase the rate of a chemicai reaction? Also differentiate
~ between homogenous and heterogeneous catalysis. (142+3)

Question 6 Part

  • {Question 6 Part (a) from Chapters 1 to 6 and Part (b) from Chapters 7 to 12)
    — a6 a Drive an expression for the radius of nth orbit of hydrogen atom (06)
    b. What is a galvanic cetls? Explain the construction and working of Zn‘Cu cell. Write down the
    cel! reaction and calculate the ceil potential of this cell. (1444141)
    _ —— 1HA 1909 7 —
    een
1st year chemistry paper 2019 federal board
1st year chemistry paper 2019 federal board

_ Centre Superintendent. Oeleting/overwriting is not alowed. Donotuselead pencil,
_ Q.1 Choose the correct answer A/B/C /D by filling the relevant bubble for each question on the OMR:
Answer Sheet according to the instructions given there. Each part carries one mark.
4) Enthalpy of combustion can be determined by.
~ A Bomb calorimeter 8. Copper calorimeter
~ c. Coffee-cup calorimeter o. Glass calorimeter
2) Bom – Haber cycie is applied to determnea:
7 A Lattice energy B. Bond energy
_ Cc. Hydration energy o. Potential energy
_ 3x What is added with S in order to balance the following equation? S—> H,S
A 2H” le” B. 2 3° c. 2H” fe” o. 2 26°
_ 4) ‘Whuch af the following has highest number of molaciies in it?
— A. 10g of NO B. lOgof NO, C, logofN,0, D. 10g of 1,0
_ 5) How many moles of O, are needed for the complate combustion of one mole of Butane (C, H,,.)?
A 8 8. 6.5 ¢. G o. 45
~ 8) ‘Which of the following orbital is of greater energy?
~ A 4d B. 6s C. af o. Sp
_ 7) ‘When fast neutrons are bombarded on nitrogen aloms, what radiations are emitted?
_ A. B -tays B. y lays Cc. X -rays. D. a -fays
8) The C — H band length will be greater when the hybridization of carban is:
~ A sp? 8. sp’ Cc. asp oO. sp
~ 9) One atmosphere pressure is equal to.

One atmosphere pressure is equal to.

  • A 101.325 Pa 6. 101.325 Bars C, 101325 Ms o. 101325 Kpa
  • 10) In which of the following pairs, both gases will diffuse at the sare rate?
    _ A H, & He 8. N,&CO c. CO&CO, OD. 0, & SO,
    _ 44) Which of the following, requires least energy for vaporization?
    A Ch 8. Br, c & nn
    ~ 12) Sadium chioride exate in cubic and octahedral forms. This phenomena is called:
    _ A Potymorphism 8. Allotropy c. Anisotropy D. Isomerism
    _ 43) 4 reaction wil procees in forward direction in order to attain equilibrium wher (Q = reaction quatient,
    XX, = equilibrium constant)
    ~ A O Kk,
    ~ 14) pH of 0.001 M NoOH solution is:
    _ A 19° 8 un c 10″ DBD 3
    15) ‘Which of the following compounds wit produce acidic solution on hydrolysis?
    7 A KNO, 8 NaCl c NH,NO, D. Nac
    7~ 16) The units of rate constant and the rate of reaction will be the same when order of reaction is:
    _ A 2 8. 3 c. Zero D. 1
    47) Which of the following is NOT a pair of partially miscible liquide?
    a az Aniline – water B. Nicotine – water

Choose the correct answer A/B/C /D by filling the

SS eee
Q.1 Choose the correct answer A/B/C /D by filling the relevant bubble for ach question on the OMR:
_ Answer Shoet according to the instructions given there. Each part carries one mark.
_ 4) Witch enthalpy change is always positive?
A Enthalpy of combustion B. Enthalpy of neutralization
~ C._ Enthaipy of solution D. —_Enthalpy of atomaaton ~ 2) The standard enthalpy of formation is zero for.
A. 4,0 8. NaCt CG. ZnO o N,
~ 3) Oxitation state of Nitrogen in Ca{A‘0,), is: ,
~ A 43 B44 C45 D. 92
4) The mage of | 1.2dm? of CO, enciosed in a container at STP is: :
_ A 2g 8. lig c. 33g o. 44g
_ §) Which series of spectral lines is present in the visible region of electromagnetic spectrum?
A Gainer series B. Paschen series ‘
_ c. Ptund series D. Lymen series Y
_ 8) The geometry of a molecule containing two bond pairs and one lone pair around the central atom is: :
A Trigonai planar 8 Triangular pyramid \
~ © Angular D. —_Tetrahedrai

Acoording to Graham’s law

  • 7) Acoording to Graham’s law. the rates of diffusion of C#f, andQ, are in ratio. :
  • A Lv? Bol ce V2a Dd 1:2 :
    8) Which gas is more teal at STP?
    ~ A HS BMH, c oF, dD = 80, :
    ~ 9) Which of the followings possesses highsst boiling point 7
    A KCl 6B. 86-0 © AS 0. HF
    40) The intermolecular forces present in chloroform CHCI, are:
    _ A Cipoie-dipole forces 8. London dispersion forces
    C. Electrostatic forces D. Hydrogen bonding :
    An Which of the followings is NOT an anisotropic property? i
    ~ A Refractive index 8. Electrical conductivity
    _ Cc. Cleavage o. Viscosity
    _ 12) CO, in sobd state forms:
    A lonic crystal 8 Molecutar crystais
    7 Cc. Liquid cryetais oO. Covaient crystals
    _ 13} For the reaction NO, == 2.10, :
    _ A K,=KART) B. K, = KARTS C. K,=K ARTY? D. K,=K, ‘
    14) ‘The value ot X, for the reaction 250, + Q, = 250, + Heat is increased by: |
    ~ A Decreasing the temperature 6. Increasing the pressure :
    — c. Decreasing the pressure oD. Increasing the temperature :
    15) Which of the following is an amphoteric oxide? :
    _ A MgO 8 Cr,0, c. NO, o. Na,O :
    16) When concentration of a reactant is doubled, the rate of reaction becomes half, The order of reaction with
    ~ respect to that substance is: ‘
    = A o B. W2 c. Al o. 41
    _ 47) A colloid, containing a aolid dispersed in @ liquid is called:

Use supplementary answer sheet 1st year chemistry paper

Use supplementary answer sheet i.e. Sheet—6 if required. Write your answers neatly and legibly. . ~~ SECTION — B (Marks 21) (Chapters 1 to 6} Q2 Answer any SEVEN parts. All parts carry equal marks. (7 x32 29)
diy Define conversion factor. We down the conversion factor for the preparation of Nf, from
— 4 motes of N’,. according to the following reaction, Ni, +3H, > 2.NH,
(a) Calculate the wave number of imitng line in Lymen series of hydrogen spectrum,
_ {eth White down any three differences between sigma and pi bonds.
_ iw) Why is the energy of o,,, orbital nigner tnan that of «., & *,,, orbitals in the molecular orttal
cagrm of V7
_ ww How will you denve absolute zero from Charlie’s law?
_ (vip 4g of CH, at 27°C and 2.5 atm pressure occupies the volume of 2.46 da’ . Caicuiste the value of
generat gas constant R. |
we (vii) What is vacuum distiation? Give its one appacabon
{viii} Describe the role of hydrogen banding in cleansing action of soap and solubility of some organic
_ compounds in water. Give anexample. |
foxy Crfferemiate between hexagonal close packing and cubic close packing of atoms in the metals
_ ixy ‘Write down the three differences between jonc and covalent solids.
SECTION – ¢ (Marks 29)
{Chapters 7 to 12)

1st year chemistry paper

Q.3 Anewer any SEVEN parts. All pasts carry 1st year chemistry paper

  • Q.3 Anewer any SEVEN parts. All pasts carry equal’marks. {7 x3 = 21)
    _ 0) Describe the effect of increase mn temperature on the value of K. for the given reactons
    at equilibrium.
    _ 250, +O; 280, AH =-198 by i mol
    NO, = 2NO, AH 2459.2 iyi mol
    ~ wo When 60 9 CH,COOH and 469 C,H,OH are heated, 129 H,Oand 5879 CH,COOC,H,
    ~~ are formed at equilibrium Calcukate the value of X,
    (my Calculate the concentration of H” tons in a solution that contains 1Mf HF(K, =7.2%10%)
    — (w) Define Lews acid and Lewis base. Give an example to show the significance of this concept
    . vh Cefine initial rate. How és it determined? (data is not required)
    7 (vi) Describe ine effect of increase in temperature on the sotubility of gases in water.
    (va) Compare any three properties of colloids. suspensions and true solutions.
    ~ (va) Differentiate between constant pressure and constant volume calorimety,
    fio State Hess’s law and give one example.
    7 oo Balance the equation by ion-electron method. Cr,O,1 + Ct! -» Cr? +Ci,
    _ SECTION – D (htarks 26)
    Note; Attempt any TWO queetions. All questions carry equal marks. (43 x 2 = 26)
    _ {Question 4 from Chapters 1 to 6)
    a4oia Differentiate between limiting and non-limiting reactant. How will you identify Emiting reactant in a
    — chemical reaction? Calculate the volume of NH, gas produced at STP when 200 g NHC 6
    _ heated wah 200 ¢ Ca(OH), according to the following reaction: (24243)
    _ 2. NH,Cl+ Ca\OH), + CaCl, ~2NH, ~ 2,0
    (Atomsc masses N= 14g i mol, Cl=35.5g’ mol, Ca=40 g/mol, 0-16 g/mol, H =| g/mol)
    ~ b. Explain the structure of acetylene on the basis of hybridization of central atom. (06)
    _ (Question § from Chapters 7 to 12)
    Qs a Explain colision theory of reachon rates with reference to activation energy. formation of
    _ activated complex and enthalpy changes in a chemucal reaction. (34342)
    _ b. Derve an expression for the determinalion of relative towering of vapour pressure and
    molecuias mass of a substance from Raouit’s Law. (23)
    ~ Chay m Chea)
    a6 a Derive an expression for total energy of election present m nth orbit of H-atom (06)
    —. hn Whee ce a Ciel aR? feerrihe the canetrochon and working of Fuel Cell. aiving the reactions

1st year chemistry paper

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