PPSC CHEM-DEMO TEST (SMART INSTITUTE)
PPSC Chemistry Demo Test
Welcome to the PPSC Chemistry Demo Test! This quiz is designed to evaluate your knowledge of fundamental and advanced chemistry concepts. Are you ready to challenge yourself and see how much you really know?
Test your knowledge in these areas:
- Atomic Theory
- Chemical Reactions
- Thermodynamics
- Periodic Table
- Electrochemistry
01- The relative atomic mass of boron, which consists of the isotopes 105B and 115B is 10.8. What is the percentage of 115B atoms in the isotopic mixture?
0.8%
8.0%
20%
80%
02- For complete oxidation, 1 mol of an organic compound requires 3 mol of oxygen gas. What could be the formula of the compound?
CH3CHO
CH3CH2OH
CH3CH3
CH3CO2H
03- What is the number of molecules in 500 cm3 of oxygen under room conditions?
1.25 x 1022
1.34 x 1022
3.0 x 1022
3.0 x 1026
04- Which statement about one mole of metal is always correct?
It contains the same number of atoms as 1 mol of hydrogen atoms.
It contains the same number of atoms as 1/12 mol of 12C.
It has the same mass as 1 mol of hydrogen atoms.
It is liberated by 1 mol of electrons.
05- Which one of the following has the same number of electrons as an alpha particle?
H
H+
H2
He
06- Which of the following elements has the largest second ionization energy?
O
F
Ne
Na
07- Which of the following represents the configuration of the three electrons of highest energy for the ground state of an element in Group III?
1s1 2s1 2p1
2s1 2p2
3p3
4s2 4p1
08- which of following determines the position of an element in the Periodic Table.
Chemical reactivity
First ionization energy
Number of electrons in outer orbital
Number of protons in the nucleus of its atom
09- Which ion is most polarising?
Al3+
Ba2+
Mg2+
Na+
10- Which solid exhibits more than one kind of chemical bonding?
Brass
Copper
Diamond
ice
11- Which of the following solids consists of atoms or molecules held together only by van der Waals' forces?
CO2
Cu
H2O
MgO
12- Which of the following solids has a simple molecular lattice?
Magnesium oxide
Sodium
Silicon(IV) oxide
Sulfur
13- Which of the following elements in its crystalline form will have the enthalpy change of vaporization?
Argon
Chlorine
Phosphorus
Silicon
14- Which statement applies to both ideal and real gases?
Collisions between molecules are elastic.
Molecules are in constant random motion.
Molecules attract each other.
Molecules have zero size.
15- Which gas is likely to deviate most from ideal gas behaviour?
HCl
He
CH4
N2
16- Which of the following exerts the highest pressure?
1 mol of N2 at 0 °C in 11.2 dm3
1 mol of N2 at 27 °C in 22.4 dm3
1 mol of H2o at 27 °C in 1 dm3
1 mol of C4H10 at its normal boiling point
17- Which class of reaction always has an endothermic enthalpy change?
Atomization
Combustion
Formation
Solution
18- Which one of the following is involved in determining the enthalpy change in a chemical reaction?
The number of stages involved in the chemical reaction
The activation energy of the reaction
The initial and final states of the reacting sysytem
The intermediates in the overall chemical reaction
19- Which of the following is the lattice energy likely to have the greatest numerical value (i.e the greatest magnitude, disregarding sign)?
Lithium fluoride
Lithium iodide
Rubidium chloride
Sodium chloride
20- Which value would be required to estimate the lattice energy for the hypothetical ionic compound MgH?
The electron affinity of hydrogen
The first ionization energy of hydrogen
The magnesium-hydrogen bond energy
The standard enthalpy change of formation of MgH2
21- Which treatment is frequently used to protect aluminium articles from subsequent corrosion?
Making the aluminium the anode during electrolysis
Dipping the aluminium in hot aqueous sodium hydroxide
Dipping the aluminium in molten cryolite
Coating the aluminium with a less reactive metal
22- An aqueous solution contains 1 mol of S2O32-ions and this reduce 4 mol of Cl2 molecules. What is the sulfur-containing product of this reaction?
S
SO2
SO32-
SO42-
23- A student electrolysis concentrated aqueous sodium chloride using carbon electrodes. She ensures that the solution is continually stirred. What happens as the electrolysis proceeds?
H2 is produced at the anode
HCl is formed
NaClO is formed
The NaCl gets more concentrated
24- What are the conditions usually quoted for the standard electrode potential of hydrogen to be 0.00 V?
The concentration of H+ (aq) is 1 mol dm-3
The temperature is 0 °C.
The atmospheric pressure is exactly 1 atm.
None
25- Which expression represents the solubility product of lead(II) chloride?
[Pb2+][Cl-]2
[Pb2+][2Cl-]
[Pb2+][2Cl-]2
[Pb2+][Cl-]2/[PbCl2]
26- The pH human blood is constant at about 7.40. Which ion or molecule present in the human body will remove containing H+(aq) ions from the blood to keep the pH constant?
CO32-
HCO3-
H2CO3
PO43-
27- 10 cm3 of 0.01 mol dm-3 solution of nitric acid is diluted with 90 cm3 of water. What is the pH of the resulting solution?
1
2
3
4
28- Which one of the following statements is correct about a reaction for which the equilibrium constant is independent of temperature?
The activation energies for both forward and reverse reactions are zero.
The enthalpy change is zero
Its rate constant do not vary with temperature
Three are equal numbers of moles of reactants and products.
29- The rate equation for reaction is given by: rate= k[A][B] If concentration units are mol dm-3, what are the possible units of the rate constant, k?
Mol dm-3 s-1
Mol-1 dm3 s-1
Mol-2 dm3 s-1
Mol-1 s-1
30- If the rate of decay of a radioactive isotope decreases from 200 counts per minute to 25 counts per minute after 24 hours, what is its half-life?
2 hours
4 hours
6 hours
8 hours
31- Which statement about the effect of a catalyst on a reversible reaction is correct?
It increases the equilibrium constant for the forward reaction.
It increases the yield of product in an equilibrium.
It increases the rate constant for both the forward reaction and the reverse reaction
It increases the rate constant for the forward reaction but not that of the reverse reaction.
32- The acid-catalysed iodination of propanone may be investigated by reacting dilute aqueous iodine with solutions containing known concentrations of propanone and acid. The rate can be followed using a colorimeter.
To buffer the acid concentration
To give a convenient rate of reaction
To keep the rate of reaction constant
To keep the propanone concentration effectively constant
33- Which of the following is the strongest reducing agent?
Cl-
Ar
K+
Ca2+
34- Which of the following oxides has a molecular structure as distinct from a giant structure?
Na2O
MgO
Al2O3
Cl2O7
35- Which species represented by the following formula has the largest radius?
P3-
Cl-
Ar
K+
36- Which of the following oxides will produce the strongest acid when treated with water?
Cl2O
Cl2O7
P2O5
SiO2
37- Which one of the following elements is likely to have an electronegativity similar to that of aluminium? To that
Barium
Beryllium
Calcium
Magnesium
38- Which of the following elements is expected to show the greatest tendency to form some covalent compounds?
Barium
Calcium
Magnesium
Potassium
39- Barium burns in oxygen to form barium oxide. What is the colour of the flame when this reaction occurs?
Blue
Green
Lilac
Orange
40- What are the products of the thermal decomposition of magnesium nitrate?
Magnesium nitride and oxygen
Magnesium oxide and nitrogen
Magnesium oxide, nitrogen and oxygen
Magnesium oxide, nitrogen dioxide and oxygen
41- Which gaseous hydride most readily decomposes into its elements on contact with a hot glass rod?
Ammonia
Hydrogen chloride
Hydrogen iodide
Steam
42- Which of the following compounds reacts with chlorine to give two products in which chlorine has different oxidation numbers?
Ethene
Potassium iodate
Potassium iodide
Sodium hydroxide
43- Concentrated sulfuric acid is added to separate solid samples of sodium chloride, sodium bromide or sodium iodide.
Sodium chloride only
Sodium chloride and sodium bromide
Sodium bromide and sodium iodide
Sodium iodide only
44- Which of the following compounds is most likely to product chlorine when concentrated hydrochloric acid is added to it?
Al2O3
Fe2O3
CuO
PbO2
45- Which of the following d-block elements can show the highest oxidation number in its compound?
Chromium
Copper
Iron
Manganese
46- For which of the following transition metals does its ground-state atom have a unpaired electron in an s-orbital?
Chromium
Cobalt
Iron
Manganese
47- What is the electronic structure of the iron(II) ion?
1s2 2s2 2p6 3s2 3p6 3d5
1s2 2s2 2p6 3s2 3p6 3d6
1s2 2s2 2p6 3s2 3p6 3d5 4s1
1s2 2s2 2p6 3s2 3p6 3d4 4s2
48- Which of the following ions is readily able to donate electrons?
Al3+
Cu2+
Fe2+
Mg2+
49- What is the number of isomers of C2H2Cl2 including cis-trans (geometrical) isomers?
1
2
3
4
50- Which formula could represent a compound which has cis-trans isomers?
C2H6O2
C2H2O4
C2H3Cl
C2H2Cl2
51- As the number of carbon atoms in the homologous series of alkane molecules increases, for which property of the alkanes does the numerical value decrease?
Density
Enthalpy change of vaporisation
Number of isomers
Vapour pressure
52- How many esters are there with the molecular formula C4H8O2?
2
3
4
5
53- A hydrocarbon, which is a liquid at room temperature, decolourises aqueous bromine. What could be the molecular formula of the compound?
C2H2
C2H4
C7H16
C10H20
54- Which substance in a vehicle exhaust results from incomplete combustion of a hydrocarbon fuel?
CO
H2O
N2
NO
55- Which property of benzene may be directly attributed to the stability associated with its delocalised electrons?
It has a low boiling point
It does not conduct electricity
Its enthalpy change of formation is positive.
It tends to undergo substitution rather than addition reactions.
56- What happens when one mole of ethane is mixed in the dark at room temperature with six moles of chlorine?
There is no reaction
CH3CH2Cl and HCl are formed.
CH3CCl3 and HCl are formed
CCl3CCl3 and HCl are formed.
57- Which of these always applies to a nucleophile?
It attacks a double bond
It has a lone pair of electrons.
It is a single atom
It is negatively charged
58- Which of the following compounds could be prepared by reacting bromoethane with potassium cyanide and then reducing the product?
CH3CH3
CH3CH2NH2
CH3CH2CH3
CH3CH2CH2NH2
59- Dichlorodifluoromethane, CCl2F@, is widely used in aerosol propellants and as a refrigerant. Which statement helps to explain why dichlorodifluoromethane is chemically inert?
The carbo-fluorine bond energy is large.
The carbon-fluorine bond has a low polarity
Fluorine is highly electronegative
Fluorine compounds are non-flammable.
60- Chlorofluoroalkanes, commonly known as CFCs, undergo homolytic fission by ultraviolet irradiation in the stratosphere. Which radical could result from this irradiation of CHFClCF2Cl?
CHFClCFCl
CHClCF2Cl
CHFCF2Cl
CFClCF2Cl
61- Which compound reacts with ammonia?
Bromoethane
Chlorobenzene
Ethanol
Phenol
62- Which reagent gives a colourless homogenous solution when added to phenol?
Aqueous bromine
Aqueous sodium carbonate
Aqueous sodium hydroxide
Aqueous sodium hydroxide and benzoyl chloride
63- Which inorganic reagent may be used to distinguish between phenol and methanol?
Alkaline aqueous I2
Aqueous NaHCO3
K2Cr2O7 in dilute H2SO4
Na
64- Which one of the following pairs of reagents cannot be used to prepare CH3CH2Cl?
CH2=CH2 + HCl
CH2=CHCl + H2
CH3CH2OH + HCl
CH3CH2OH + Cl2
65- Which reagent gives the same visible result with propanol and with propan-2-ol?
2,4-dinitrophenylhydrazine reagent
Acidified potassium dichromate(VI)
Concentrated sulfuric acid
Tollen's reagent
66- When propanal reacts with Tollens' reagent, what are the principal inorganic and organic product?
Ag and CH3CH2CH2OH
Ag and CH3CH2CO2H
AGNO3 and CH3CH2CO2H
Ag2O and CH3CH2CO2H
67- How many structural isomers with the molecular formula C4H8O can reduce a solution containing Ag(NH3)2+ ions (Tollens' reagent) to form a silver mirror?
1
2
3
4
68- Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre?
CH3CHO
CH3CH2COCH2CH3
CH3CO2CH3
HCHO
69- Which class of compounds is commonly used for the artificial flavourings in jams?
Aldehydes
Carboxylic acid
Esters
Ketones
70- Which compound is a product of the hydrolysis of CH3CO2C3H7 by boiling aqueous sodium hydroxide?
C3H8
CH3OH
C3H7OH
C3H7CO2-Na+
71- Which compound reacts with its own oxidation product (an oxidation which involves no loss of carbon) to give a sweet-smelling liquid?
Propanal
Propanoic acid
Propanone
Propan-1-ol
72- Ethanoic acid has a pka of 4.7. What will have a higher pka value?
ClCH2CO2H
C6H5CO2H
C6H5OH
HCO2H
73- Which of the following compound is least soluble in water?
CH3CH(NH2)CO2H
CH3CH(OH)CH3
CH3CH2CH2NH2
C6H5NH2
74- What is produced when propanenitrile, CH3CH2CN reacts with hydrogen using a palladium catalyst?
CH3CONH2
CH3CH2NH2
CH3NH2 and CH4
CH3CH2CH2NH2
75- What stabilises the α-helix of proteins?
Disulfide bridges and hydrogen bonding
Disulfide bridges only
Hydrogen bonding only
Van der Waals' forces only
76- After the reduction of nitrobenzene to phenylamine, using tin and concentrated hydro-chloric acid, an excess of sodium hydroxide is added. What is the purpose of the sodium hydroxide?
To dry the product
To liberate phenylamine
To lower the boiling point for subsequent distillation
To precipitate tin(II) hydroxide
77- How many atoms of carbon are present in 18 g of glucose, C6H12O6?
6.0 x 1022
3.6 x 1023
6.0 x 1023
3.6 x 1024
78- What volume of oxygen is required for the complete combustion of a mixture of 5 cm3 of CH4 and 5 cm3 of C2H4?
10 cm3
15 cm3
20 cm3
25 cm3
79- What volume of 0.10 mol dm-3 aqueous silver nitrate reacts with 20 cm3 of 0.20 mol dm-3 barium chloride?
10 cm3
20 cm3
40 cm3
80 cm3
80- A 0.20 g sample of a monobasic acid requires 8.0 cm3 of 0.40 mol dm-3 sodium hydroxide for complete reaction.
62.5
250
625
640
81. From which country Pakistan purchased Gawader?
Kuwait
Iran
Oman
None of these
82. Which Provincial Chief Minister was dismissed on the issue of One unit?
Chief Minister NWFP
Chief Minister Sindh
Chief Minister Punjab
Chief Minister Baluchistan
83. Which Radio Station already existed at creation of Pakistan?
Peshawar
Karachi
Quetta
None of these
84. When was the state of Swat included in Pakistan?
4th Aprial 1969
28th July 1969
19th June 1970
None of these
85. Who did accompany the Holy Prophet (SAW) in the migration to Medina?
Hazart Abu Bakr(RA)
Hazart Omar (RA)
Hazrat Ali (RA)
Hazrat Usman (RA)
86. After the Hijrat to Medina, what was the first thing important thing the Holy Prophet(SAW) did?
Built a Mosque for prayers
Built his house
Created Bait-ul-Maal
Raised an army
87. Name the angels who are appointed to put question to the deads in their graves.
Munkir and Nakecr(AS)
Hazrat Omar (RA)
Hazart Liraeeel (AS)
Hazrat Kikact (M)
88. Ramadan is the ...... moth of Islamic Calendar
7th
9th
1st
10th
89. Which is the longest glacier found in Pakistan?
Hispar
Siachen
Tirich
Batura
90. K2 is also called
Goodwin Austin
Kalhar Mount
Sia Kingrl
None of them
91. In 1859 Sir Syed set up a school where Persian and English was tought
Lucknow
Bijnaur
Muradabad
Aligarh
92. Eiffel Tower is located in
France
Germany
Italy
Australia
93. Pentagon is the Military headquarter of ..
UK
Russia
China
USA
94. WOF is the ''Newest Capital of the World''?
Islamabad
Sydney
London
Paris
95. Which continent has no desert?
Europe
North America
Australia
None of these
96. Who painted Mona Lisa?
Leonardo Di Caprio
Leanardo Da Vinci
Picasso
Leonardo Da Henry
97. Which bird is the symbol of peace?
Swan
Flamingo
Dove
Duck
98. How many zeros are there in one Billion?8
8
11
10
9
99. Cuba is located in...
Indian Ocean
Atlantic Ocean
Pacific Ocean
Aretic Ocean
100. Islamabad is situated in which
Punjab
Azad Kashmir
NWFP
None of these
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