9th class chemistry paper 2018 federal board

9th class paper in written form you can find only here this data is original its 100%tested 9th class chemistry paper 2018 federal board

Answer any SEVEN parts

(Cheaters 1 to)
Q.2 Answer any SEVEN parts. All parts carry equal marks. (7×3 = 21)
a How many covalent bonds are present in 16grams of ©, (Molar mass of © = 16 grivenai)
qi) ‘What is the relationship between:
a) Energy and wavelength
b) Frequency ard wavelength
{ut 1, 2-dichloroethene has cis and trans isomers.
a) Draw ihe structure of these isomers
b) Which of them will have pO? (where yu is dipole moment)
in) If 465cm* of SO, can diffuse through porous partition in 30 seconds. How iong will 620cm’ of HS
take {o diffuse through the same partition? [Atomic masses (amu): H -1,S- 32.0- 16]
(vi Give any three properties of Plasma.
(a) Onfleremiate between tne following:
al isomorphism and polymorphism:
by Amorphous Soits and Crystaline Solids
(mm) Write the electronic configuration of the following with the help of ‘ar +/’ rule.
a) Mn
3} AP
(vit) Speed of chemical reacton of covalent compound ts slow as compared to ionic compound Justify the
statement
{ey Bnefly expiain why the cimate near large water bodies is moderate than intenor of ihe ‘and?
pe A photon of ight with energy 10’S is emitied by a source. Find the wave number ( ¥ ) associated
with ths energy (Piank’s constant * 6.625-10″”.S , Speed of Sght = 3.010″ ms”)
SECTION — ¢ (Marke 24)
{Chapters 7 10.12)
Q.3 Answer any SEVEN parts, All parts carry equal marks. (P x3 = 21)
@ Predict the direction of reverstole reaction if:
a Qsk,
Dy Q=K,
¢) Qek,
‘Where Q — [product] and K, = Equilibrium constant

9th class chemistry paper 2018 federal board
9th class chemistry paper 2018 federal board

[reactant]

*
(ay How many types of chernical equiliteium are there with respect to physical siabe of reactants and
products? Give an example of each.
(iii How many types of salts are there on the basis of reactivity with water? Give an example of each
(i) Cakulate pOH of 0.001 M HC) sotution.
Page | of 2 (Chemistry)

9th class chemistry paper

Answer any SEVEN parts

{Cheoters 1 to 6
Q.2 Answer any SEVEN parts. All parte carry equal marks, (7 x3 = 29)
a CHO >2C,HOK,,,+2C0,,, (Molar Masa of C-12,H-1.0 -16(gmimol))
al What is theoretcal yield of ethanol from 10.0 g of glucose (C’.44,.0,) 7
a} (tin a particular reaction, 10% of gkicose (C,H,,O, ) produces 0.6642 of etmanol (C,1,GH)
Find the percentage yeld of Ethanol
ui ‘What are X,Y, and Z in the follomng reactons?
a} NM tn! ae X44
bi :B!’+, Hef —+: 7’*4 on!
th ‘What could be the shape of the molecules having following electron pa °s around centrai atom? Give
examples
“Nootlone No of bond
pairs pars
—_ 9 —i _

  • tL. _d
    — 2 – 2
    iy} G18 paramagnetic and N, is diamagnetic in nature” How can you justify thes statement by using
    motecutar orbital theory?
    ivi In a Pressure cooker, food can be cocked quickly, as compared to the simple conker, Give reason
    uth How does the electron gas theory explain metalli¢ bonding?
    hy What is anisotropy? Explain briefly with example.
    (with “Real gases deviale from tne <iea! behaviour at high pressure and low temperature’ Give wo valid
    feasons 10 expiain bs Denaviour.
    tod Find iota pressure exerted by 2. grams of ethane (C,H, ) and 3 grams of CO, contaned ma Sdm’ vessel
    at 50°C. (Molar mass of C.0) and Hl are 12,16. 1 gmmol . respectively R=0.0821 atm.K mot”;
    Oxy ‘What 1s Pauli s exclusion principle?
    FECTION ~ C
    (Chapters 7 to 42)
    Q.3 Answer any SEVEN perte. All parts carry equel marke. {7 «3 = 21)
    wi Predict ine effect of change in pressure and temperature on the chemical equiionum in the given
    reaction
    Ng, +3H.,, == 2NH,,, SH – -198KJ mol!
    iy The soubilty of AgBr is 7.110″ M at 25°C. Calculate ts K,
    Paon 1 of 2 (Crema
  • 9th class chemistry paper
  • 9th class chemistry paper 2018 federal board

Define the following 9th class chemistry paper

(iy Define the following ’
a} Acid dissociation conatant (K, }
by Base dissociation constant (K, }
tiv) ‘Which of the fotliowing reactions will show high rate of reaction? Atso give reason.
7n,,, *2HCL., —> 7h tH: (Zn in powdered form)
(oR)
2,4 t21ICh, – — 9» ZAC, HH, (21 1 form of big pieces}
(4) Define the teem ‘Water of crystallization”. Also give two exariples of it
(ay One molar aqueous solution of sugar is mare concentrated as compared 19 one molal aquecus:
solution of sugar at room temperature. Justily the statement.
(vi) “The standard enthalpy of formation of SO,,, i -395.2kJ/mol *. Shaw the given information with
the heip of a valid chemical equation.
(wii) What is electromotive force (emf)? Also define ihe term Voit.
(x) Calculate E’_,, and aiso predict whether or not the call is feasible:
E casear = –0.25V
Kye = -238V
xy How many types of sats are there? Give an example of each
SECTION — D (Marks 26)
Note: Attempt any TWO questions. All questions carry equal marks. 3 x2 = 38)
(Question 4 from Chapters ? to §)
ata ‘What is wsoosity? Expiain the factors affecting it {02+05)
b. Describe the differences between motecutar orbital theory and valence bond theory. (06)
{Queation § trom Chagiers 7 to 12
Qaég a ‘What is Standard Hydrogen Electrode (SHE). Exprain in detait (07)
b. Define tne following terms with exampies (08)
i State function
3 Hea Capacity
a Enthatpy of substance
(Question € Part ia) from Chapters 1 to 6 and Part (b) Chapters 7 to 12)
Qaéia Calculate the following n |0g of NH, at STP (Molar masses: N“14, He! giv‘mo! ): (06)
f Number of moles
it Number of molecules
Volume in hin?
b Woaat is Le-Chatebes’s principle? Descabe three major steps which could be taken in order to
get maximum yield of NH, in Haber’s process – (02+05)

  • THA 1808 (ON) =
  • 9th class chemistry paper

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