PPSC CHEMISTRY PAST PAPERS MCQS solved BY Malik XUFYAN

JIAS ACADEMY 0313-7355727
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1.
JIAS ACADEMY
2017
PPSC Past Papers
CHEMISTRY MCQS
Malik Xufyan
J H A N G I N S T I T U T E F O R A D V A N C E S T U D I E S - C E L L # 0 3 1 3 7 3 5 5 7 2 7

MCQs Of Chemistry From Past Papers
Q.1. Select the best option/answer and fill in the appropriate box on the
Answer Sheet (20)
1. When an electron is brought from infinite distance close to the nucleus
of the atom, the energy of Electron-nucleus system?
a. increases to a smaller negative value
b. decreases to a greater negative value
c. decreases to a smaller positive value
d. increases to a greater positive value
2. The probability of finding the electron in the nucleus is:
a. 100% due to forces of attraction
b. finite for all orbitals
c. Zero for all orbitals
d. Zero for some orbitals and finite for others
3. When Zn metal is kept in CuSO4 solution, copper is precipitated and
ZnSO4 is formed because:
a. Atomic number of Zinc is smaller than copper
b. Atomic number of Zinc is larger than copper
c. Standard reduction potential of Zinc is more than that of copper
d. Standard reduction potential of Zinc is less than that of copper
4. Electrolytes when dissolved in water, dissociate into their constituent
ions, the degree of dissociation of an electrolyte increases with the:
a. Presence of a substance yielding common ion
b. Decreasing temperature
c. Decreasing concentration of electrolyte
d. Increasing concentration of electrolyte
5. There is a large positive entropy change for an exothermic reaction. It
means that the reaction will be:
a. possible at high temperatures only
b. impossible at all temperatures

c. possible at low temperatures only
d. possible at all temperatures
6. Which of the following statement is false?
a. the temperature of the system will fall if an exothermic reaction is
isolated from its surroundings
b. Energy is absorbed when one compound is converted into another
with higher heat content
c. the temperature of the system is likely to fall if heat is absorbed
during the course of a reaction
d. None of these
7. The H_____ bond is strongest in:
a. S-H …….O
b. O-H …….S
c. F-H …….O
d. F-H ……..S
8. Heavy water contains:
a. Large amount of salts
b. Deuterium
c. O18
d. O16
9. pH + pOH of a solution is:
a. 7
b. Zero
c. 14
d. -14
10.The compound that is not Lewis acid:
a. BF3
b. BaCl2
c. SnCl4
d. AlCl3
11.Strongest acid having Ka:
a. 104
b. 10-4
c. 1
d. 10-2

12.Ore of Aluminium:
a. Calamine
b. Dolomite
c. Bauxite
d. Limestone
13.Oxidation number of S in sulphuric acid:
a. Four
b. Six
c. Two
d. Eight
14.d-block elements form coordination compounds because of:
a. Small Cationic size
b. Large ionic Charge
c. Unfilled d-orbitals
d. Filled d-orbitals
15.Brass is an alloy of:
a. Cu and Zn
b. Cu, Ni, Zn
c. Cu and Ni
d. Cu, Al, Zn
16.Urea is a high quality nitrogenous fertilizer with:
a. 76% nitrogen
b. 46% nitrogen
c. 66% nitrogen
d. 26% nitrogen
17.Diamond is:
a. Good conductor of electricity
b. Bad conductor of electricity
c. Bad conductor on heating
d. Good conductor on heating
18.Carbon monoxide is poisonous gas because it:
a. replaces oxygen from lungs
b. forms carboxy haemoglobin
c. Forms carbon dioxide with oxygen
d. has a sweet smell

19.Rust is:
a. FeO + Fe(OH)2
b. Fe2O3 + Fe(OH)2
c. Fe2O3
d. Fe2O3 + Fe(OH)3
20.Calcium Carbide reacts with water to give:
a. Methane
b. Ethylene
c. Acetylene
d. Ethane
21.Nuclear fusion, like nuclear fission:
(A) is a chain process
(B) is exoergic
(C) produces several radioactive products
(D) involves isotopes of heavy nuclei
22.Which of the following spectroscopy uses an energy source of around
70 ev?
(A) Mass spectroscopy (B) NMR Spectroscopy (C) IR (D) Atomic
absorption
23.If coordination number is 6, the radius ratio is:
(A) 0.155 (B) 0.414 (C) 0.225 (D) 0.7071
24.The geometry and type of hybrid orbital present about the central
atom in BF3 is
(A) Linear, is (B) Trigonal planner, sp2
(C) Tetrahedral, sp3
(D) Pyramidal,
sp3
25. 30 P15
is unstable because:
(A) its n/p ratio is just 1 (B) it is odd-odd nuclear (C) its Z is odd (D) it is
chemical reactive
26.The structure that remains after an acid has given up proton is called:
(A) conjugate acid (B) conjugate base (C) conjugate salt (D) conjugate
proton
27.In HB3 molecule the H-B-H bond angle is 1200
. What kind of
hybridization is likely?
(A) sp (B) sp2
(C) sp3
(D) sp3
d

28.The circle temperature of water is higher than 02. because the H20
molecules have
(A) fewer electrons than 02 (B) Two covalent bonds (C) V-shape (D) Dipole
moment
29.When a nucleus emits beta particles, the parent and daughter nuclei
are:
(A) Isobars (B) Isotopes (C) Nuclear isomers (D) Isotones
30.The uranium-238 decays to thorium-234 process of :
(A) Alpha radiation (B) Beta radiation (C) Gamma radiation (D) Fission (E)
Fusion
31.If pure ‘p’ orbitals were used in forming the B-F bonds in BF3, angles
900
would be expected. The actual observed bond angle is 1200
. What
concept might be useful in explaining the observed angles?
(A) VSEPR theory (B) Ligend field theory (C) M.O theory (D) Hybridization
32.The complexes that contain less than three d-electrons are
(A) stable (B) inert (C) unstable (D) labile
33.A gas is said to behave like an ideal gas when the relation
PV/T = Constant. When do you expect a real gas to behave like ideal
gas
(A) when the temperature is low
(B) when both the temperature and pressure are low
(C) when both temperature and pressure are high
(D) when the temperature is high and pressure is low
34.Which of the following units represent the largest amount of energy:
(A) Calorie (B) Joule (C) Erg (D) Electron Volt
35.If in the reaction of Flourine-19 with a neutron, nitrogen-16 is formed,
what is the other particle given off in the reactions.
(A) 1
0
H (B) 2
4
He (C) 1
0
C (D) 1
1
H
36.When two cubes are pressed over each other they unite to from one
cube. Which of the following force is responsible for holding them
together:
(A) Vander wall’ s forces (B) Covalent attraction
(B) Hydrogen bond formation (D) Dipole-dipole interaction
37.The high polymer of Ethylene is known as:
(A) Polytyene (B) Tyrene (C) Tetralene (D) Polythene

38.The formula of potassium cobaltinitrite is:
(A) K2 [ Co (NO)6 ] (B) K3 [ Co (NO2)6] (C) K [Co (NO2)6] (D) K3 [Co(NO)6]
39.An example of a non-stoichiometric compound
(A) Al2O3 (B) Fe3O4 (C) NiO2 (D) PbO
40.The radioactivity due to C-14 isotope (half life 6000 yrs) a sample of
wood form an ancient tomb was found to be nearly half of that fresh
wood. The tomb is therefore about
(A) 3000 yrs (B) 9000 yrs (C) 6000 yrs (D) 12000 yrs
41.Principal quantum number determines how far from the nucleus the is
to be found
(A) proton (B) neutron (C) electron
42.Elements of s-block all have configmations
(A) ns1
/ ns2
(B) ns3
/ ns4 (C) ns5
ns
43.Bronsted acid is a proton
(A) accept (B) donor (C) none
44.The distance between the two successive crests or two successive
troughs is called
(A) wave – length (B) frequency (C) wave number
45.Carbon dioxide molecule has
(A) bent structure (B) triangular structure (C) linear structure
46.Array of points which show how the constituent particles of a crystal
are. Arranged at different sits in 3 dimensional space is called
(A) space lattice (B) lattice array (C) crystal lattice (D) all of above
47.lonic hydrides are formed by elements of
(A) group-III A (B) group-II A (C) group-IA
48.Paramagnetic compounds are
(A) repelled (B) attracted (C) neither of them
49.The compounds having all the electrons paired are called
(A) Ferromagnetic (B) Diamagnetic (C) Paramagnetic
50.At equilibrium at specific temperature, presser exerted by the liquid is
called
(A) Gaseous pressure (B) Vapour pressure (C) Solid pressure
51.A subtituent effect on an organic compound due to the permanent
polarity of the group is called
(A) inter pair effect (B) inductive effect (C) chelate effect

52.An orbital which possesses lower energy than atomic orbitals from
which it is formed is called
(A) Anti bonding (B) bonding (C) Addition
53.pH is the logarithm of the reciprocal of the
(A) hydrogen ion concentration (B) phosphorous ion concentration
(C) phosphine ion concentration
54.A lewis structure is a representation of a molecule that shows the
disposition of
(A) valence protons (B) valence electrons (C) valence neutrons
55.The hydrogen bond has
(A) electrostatic nature (B) neutral nature (C) coordinate nature
56.The geometry associated with sp3
d2
hybridization is:
a. Octahedral (b) Tetrahedral (c) Trigonal planar (d) Trigonal biplanar
57.Which of the following molecules has a dipole movement?
a. CH4 (b) CO2 (c) H2O (d) CCl4
58.Which of the following represents the shape of NH3 molecule?
a. Trigonal planar (b) Angular (c) Trigonal Pyramidal (d) Tetrahedral
59.Which of the following is the largest ion?
a. Li+
(d) Na+
(c) Rb+
(b) Cs+
60.Which of the following represent different isotopes of the same
element?
i. 12 protons, 11 neutrons, 12 electrons
ii. 11 protons, 12 neutrons, 11 electrons
iii. 10 protons, 12 neutrons, 12 electrons
iv. 11 protons, 12 neutrons, 10 electrons
v. 12 protons, 12 neutrons, 12 electrons
a. 1 and 5 (b) 2 and 4 (c) 2, 3, 4 and 5 (d) None of these
61.Which of the following represents the correct number of particles in
79 2 34 Se ?
a. 34 protons, 79 neutrons, 2 electrons
b. 34 protons, 45 neutrons, 32 electrons
c. 34 protons, 45 neutrons, 2 electrons
d. 34 protons, 45 neutrons, 36 electrons
62.When Pt and Co are electrically connected, which one is corroded:

a. Pt (b) Co (c) Both of these (d) None of these
63.What is the pH of 0.0001 M NaOH solution?
a. 4 (b) 10 (c) 5 (d) 14
64.What is the pH of 1.0 x 10 3
M HCl solution?
a. 10 (b) 30 (c) 3 (d) 0.3
65.Which of the following is the correct equilibrium expression for the
reaction
N2(g) + 3H2(g) 2NH3 g ?
a. [ 2NH3][N2+ 3H2] (b) [2NH3] / [N2][3H2]
c. [NH3]2
/ [N2][H2]3
(d) [NH3]2
/ [N2]+[H 2]3
66.Which of the following best describes how a catalyst works?
a. It changes the potential energies of the reactants and products.
b. It decreases the temperature of the reaction which leads to a faster
rate.
c. It lowers the activation energy for the reaction by providing a
different reaction mechanism.
d. It raises the activation energy for the reaction which produces a faster
rate.
67.Which of the following will not act as Lewis acid;
a. AlCl3
b. BF3
c. FeBr3
d. CCl4
68.Which of the following is the strongest acid?
a. HF (b) HCl (c) HBr (d) HI
69.Which of the following could be used for cathodic protection:
a. Al (b) Cd (c) Cu (d) None of these
70.Hybridization of XeF4 is:
a. sp3
d (b) sp2
d2
(c) sp3
d2
(d) sp3
71.Which of the following will increase the rate of the reaction?
a. Decreased temperature and increased concentration of reactants
b. Decreased temperature and decreased concentration of reactants
c. Increased temperature and decreased concentration of reactants
d. Increased temperature and increased concentration of reactants

72.Silicones are polymeric substances with linkage:
a. Si – S – Si (b) Si – O – Si (c) Si (CH3)4 (d) O = Si = O
73.There is a large positive entropy change for an exothermic reaction. It
means that the reaction will be:
a. possible at high temperatures only
b. impossible at all temperatures
c. possible at low temperatures only
d. possible at all temperatures
74.Which of the following substituent deactivates benzene ring and is o,
p-directing?
a. - NH2
b. - Cl
c. - OCH3
d. - OH
75.Which of the following is most readily nitrated?
a. Toluene
b. Benzaldehyde
c. Nitrobenzene
d. Benzoic Acid
76.Ketones can be prepared by reaction of Grignard reagent with:
a. Acid Amides
b. Acid Chloride
c. Carboxylic Acid
d. Epoxides
77.Which of the following statements about the order of reaction is true?
a. The order of a reaction can only be determined by experiment.
b. A second order reaction is also bimolecular
c. The order of reaction must be a positive integer
d. The order of reaction increases with increasing temperature.
78.Polysaccharides yield many monosaccharides on:
a. Hydration
b. Oxidation
c. Reduction
d. Hydrolysis
79.Which of the following is not aromatic?

a. Benzene
b. cyclooctatetraene
c. Pyridine
d. Phenol
80.Which of the following is most basic?
a. H2O
b. NH3
c. CH3 NH2
d. CH3OH
81.Which of the following has lowest pH?
a. CH3COOH
b. CF3COOH
c. ClCH2COOH
d. Cl3CCOOH
82.The equilibrium of two readily interconvertible isomers is called:
a. Stereoisomerism
b. Metamerism
c. Tautomerism
d. Polymorphism
83.Which of the following compounds exhibit geometrical isomerism?
a. 1-Pentene
b. 2-Pentene
c. 2-methyl –2-Pentene
d. 2-methyl –2-Butene
84.Which of the following gives a tertiary alcohol when treated with
Grignard reagent:
a. HCHO
b. CH3CHO
c. C3H5CHO
d. CH3COCH3
85.Which of the following tests is not used to identify aldehydes?
a. Tollen’s test
b. Benedict solution test
c. Fehling solution test
d. Ammonia test

86.Which is incorrect about alkaloids?
a. Naturally Occuring
b. Possess a hetrocyclic ring
c. Exhibit biological action
d. acidic in nature
87.Which of the followings will not give iodoform test:
a. Acetone
b. Ethylacohol
c. Benzaldehyde
d. Acetaldehyde
88.The reaction of aniline with bromine water gives:
a. o-bromoaniline
b. p-bromoaniline
c. 2,4-dibromoaniline
d. 2,4,6-tribromoaniline
89.The reaction of tripalmitin, with sodium hydroxide is called:
a. Hydrolysis
b. Saponification
c. Esterification
d. Combustion
90.Which one is not Petrochemical?
a. Napthalene
b. Mineral Oil
c. Wax
d. Table Salt
91.Chemical adsorption:
a. is exothermic
b. is irreversible
c. takes place at high temp.
d. All of these
92.The most commonly used absorbent for chromatographic separation
of organic compound is:
a. Activated charcoal
b. Fuller’s Earth
c. Alumina

d. Silica gel
93.Grignard reagent is:
a. Organo Zinc halide
b. Organo cadmium bromide
c. n-Butyl Lithium
d. Organo Magnesium halide
94.The term syndiotactic is related to which one of the following?
a. Synthetic detergents (b) Table Salt (c) Paraffin (d) Polyprophylene
95.Which one of the following is used as an Antibiotic?
a. Patulin (b) Insulin (c) Soserine (d) Trypsin
96.Heroin is diacetate of:
a. Papaverine (b) Morphine (c) Codeine (d) Thebaine
97.A reaction that practically is given by all organic compounds.
a. Elimination (b) Friedel-Craft ecylation (c) Combustion (d)
Rearrangement
98.Which functional group is present in polyester shirt?
a. Lactam (b) Acid Chloride (c) Ether (d) Ester
99.Which statement is true for Halogen (Halo-group)?
a. Activating and O, p–directing
b. Activating and m–directing
c. Deactivating and O, p–directing
d. None of these.
100. Which one of the following can be synthesized from Aryl
Diazonium Salt?
a. Furfural (b) Carbylamine (c) Biphenyl (d) THF
101. The Methyl group in Methyl Magnesium Iodide can act as:
a. CH3 Radical (b) CH3 Carbonium ion (c) CH3 Carbanion (d) Can
react with a base
102. Nylon is a copolymer of:
a. Urea and Formaldehyde
b. Phenol and Formaldehyde
c. Hexamethylenediamine and adipic acid
d. Vinyl Chloride and Vinylalcohol
103. Which of the following would react with one mole of
Grignard’sreagent to yield a ketone?

a. R′R′RCON (b) R′RCONH (c) RCONH2(d) RCOOH
104. Glyceraldehyde has one ofthe following properties:
a. One asymmetric carbon atom
b. Two asymmetric carbon atoms
c. A meso compound
d. Four asymmetric carbon atoms
105. The antifreeze compound ethylene glycol has the formula:
a. C2H5OH (b) CH3OH (c) C2H4(OH)2(d) C3H5(OH)3
106. Distillation is the best method for separating the two substances in
which of the following:
a. Water and salt dissolved
b. water and a substance which does not dissolve in it
c. Two liquids that have different boiling points
d. Two solids that have different melting points.

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