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Chemistry Mcqs for CSS & PSC Exams

Chemistry Mcqs For CSS & PSC Exams

(i) The geometry associated with sp3d 2 hybridization is:
(a) Octahedral (b) Tetrahedral (c) Trigonal planar (d) Trigonal biplanar
(ii) Which of the following molecules has a dipole movement?
(a) CH4 (b) CO2 (c) H2 O (d) CCl 4
(iii) Which of the following represents the shape of NH 3 molecule?
(a) Trigonal planar (b) Angular (c) Trigonal Pyramidal (d) Tetrahedral
(iv) Which of the following is the largest ion?
(a) Li  (b) Cs  (c) Rb  (d) Na 
(v) Which of the following represent different isotopes of the same element?
1. 12 protons, 11 neutrons, 12 electrons
2. 11 protons, 12 neutrons, 11 electrons
3. 10 protons, 12 neutrons, 12 electrons
4. 11 protons, 12 neutrons, 10 electrons
5. 12 protons, 12 neutrons, 12 electrons
(a) 1 and 5 (b) 2 and 4 (c) 2, 3, 4 and 5 (d) None of these
(vi) 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
(vii) Which one of the following is correct equation for the reaction of chlorine with water?
(a)
2Cl + H 2 O2HCl +
2
1
O2
(b) Cl 2 + 2H 2 O 2HCl + H 2 O2
(c) Cl 2 + 3H 2 OHClO3 + 5HCl (d) Cl 2 + H 2 O HCl + HOCl
(ix) When Pt and Co are electrically connected, which one is corroded:
(a) Pt (b) Co (c) Both of these (d) None of these
(x) For the reaction (Zn + Cu 2  Zn 2 +Cu), which of the following statements is correct?
(a) Zn is dissolved and Cu is deposited (b) Cu is reduced and Zn is exidized
(c) Cu is the cathode and Zn the anode (d) All statements are correct
(xi) What is the pH of 0.0001 M NaOH solution?
(a) 4 (b) 10 (c) 5 (d) 14
(xii) What is the pH of 1.0 x 10 3M HCl solution?
(a) 10 (b) 30 (c) 3 (d) 0.3
(xiii) Which of the following is the correct equilibrium expression for the reaction
[N 2 (g) + 3H 2(g) 2 ( )] 3 NH g ?
(a) [ 3 2NH ][N 2 + 3H 2 ] (b) [2NH 3 ] / [N 2 ][3H 2 ]
(c) [NH 3 ] 2 / [N 2 ][H 2 ] 3 (d) [NH 3 ] 2 / [N 2 ]+[H 2 ] 3
(xiv) 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.
(xv) Which of the following will not act as Lewis acid;
(a) AlCl 3
(b) BF3
(c) FeBr 3
(d) CCl 4
(xvi) Which of the following is the strongest acid?
(a) HF (b) HCl (c) HBr (d) HI
(xvii) Which of the following could be used for cathodic protection:
(a) Al (b) Cd (c) Cu (d) None of these
(xviii) Hybridization of XeF 4 is:
(a) sp 3 d (b) sp 2 d 2 (c) sp 3 d 2 (d) sp 3
(xix) 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
(xx) Silicones are polymeric substances with linkage:
(a) Si – S – Si (b) Si – O – Si (c) Si (CH 3 ) 4
(d) O = Si = O
 

Chemistry Mcqs For CSS & PSC Exams

Chemistry Mcqs For Public Service Exams

Chemistry Mcqs For Public Service Exams

Q.1. (a) What is hydrogen spectrum? How does it help in understanding the structure ofatom? (10)
(b) Write comprehensive notes on hydrogen and metallic bonding. (10)
Q.2. (a) What do you understand by Ionic Equilibria? (7)
(b) Discuss buffer solutions and their mechanism. (7)
(c) Discuss the principle and working of Glass Electrode. (6)
Q.3. (a) Classify Silicates into different types. Give the composition and structure of atleast two types of silicates. (6)
(b) Give the preparation, properties and structure of Phosphorus Penta oxide. (5)
(c) Describe the preparation and properties of Nitrogen Dioxide (NO2). (5)
(d) Write a note on Interhalogen Compounds. (4)
Q.4. (a) What are the principal ores of Silver? How Silver is extracted from its ores?(8)
(b) Discuss the metallurgy of copper. (6)
(c) Give the names of Iron Ores. (6)
Q.5. (a) Describe the contact process for the manufacture of sulphuric acid. (8)
(b) What are the different types of Fertilizers? Give their chemical formula. (5)
(c) Discuss the measures for the control of CO (Carbon mono-oxide) pollutionin air. (7)
Q.6. (a) Discuss the general characteristics of transition elements based on theirelectronic configuration. (10)
(b) How free energy and chemical equilibrium are related to each other? (10)
Q.7. Write notes on any FOUR of the following: (5 each)
(a) Fixation of Nitrogen
(b) Semiconductivity Devices
(c) Metallurgy of Aluminium
(d) Crystal field theory
(e) Entropy and second law of thermodynamics
(f) Water Pollution
(3) Which type of reaction is occurring when a metal undergoes corrosion:
(a) Oxidation-reduction (b) Neutralization
(c) Polymerization (d) Saponification
(e) None of these
(4) What is the pH of 0.00001 Molar HCl solution:
(a) 1 (b)9 (c)5
(d) 4 (e) None of these
(5) What is the total number of atoms contained in 2 moles of nickel?
(a) 58.9 (b) 118 (c) 6.02 ´1023
(d) 1.2 ´1024 (e) None of these
(6) What is the percent by mass of oxygen in magnesium oxide (MgO):
(a) 20 % (b) 40 % (c) 50 %
(d) 60 % (e) None of these
(7) Which halogens are gases at STP?
(a) Chlorine and Bromine (b) Chlorine and Fluorine
(c) Iodine and Fluorine (d) Iodine and Bromine
(8) The internal resistance of a liquid to flow is called:
(a) Surface tension (b) Capillary action
(c) Viscosity (d) Van der waals alteraction
(e) None of these
(9) Two Cu Cu2+ couples, A and B are prepared with Cu2+ concentration of exactly
twice that of B. If these two couples are joined to make a cell:
(a) No current will flow (b) Current will flow from A to B
(c) Current will flow from B to A (d) The system will be in equilibrium
(10) The valence of an element:
(a) Always equals the oxidation number
(b) Never equals the oxidation number
(c) Is unrelated to the oxidation number
(d) May be numerically equal to the oxidation number
(11) The basic raw materials used in a Blast furnace to produce Iron are Iron ore, Coke,
Air and:
(a) Scrap Iron (b) Sulphur (c) Sand
(d) Limestone (e) None of these
(12) In contrast to the carbonates of the alkali metals, the alkaline earth carbonates:
(a) Are more soluble
(b) Cannot be isolated
(c) Decompose on heating metal and CO2
(d) Decompose on heating forming oxide and CO2
(e) None of these
(13) Coustic Soda is the common name for:
(a) KOH (b) Na2CO3 (c) K2CO3
(d) NaOH (e) None of these
(14) When 2 g of Copper was heated with Sulphur 2.51 g of sulphide was produced.
The empirical formula of the sulphide is:
(a) Cu S2 (b) Cu2 S
(c) Cu2 S3 (d) None of these
(15) The atomic number of an element is equal to the number of:
(a) Protons in the nucleus (b) Protons and neutrons in the nucleus
(c) Neutrons in the nucleus (d) None of these
(16) A liquid will boil at a given temperature provided the atmospheric pressure is equal
to:
(a) The vapour pressure of the liquid (b) Zero
(c) One atmosphere (d) The critical pressure
(e) None of these
(17) When 12 g of magnesium are dissolved in acid, 1g of hydrogen is produced. What
conclusion may correctly be drawn from this information:
(a) The atomic weight of magnesium is 12
(b) The atomic weight of magnesium is 24
(c) The equivale nt weight of magnesium is 24
(d) Not possible to obtain atomic weight from this information
(18) The more reactive a metal:
(a) The less easily it is oxidized
(b) The more easily it gains electrons
(c) The greater is its tendency to form positive ions
(d) The small is its ionization potential
(e) None of these
(19) Sulphure crystallizes in both monoclinic and rhombic forms. This is an exampleof:
(a) A morphism (b) Isomorphism (c) Allotropy
(d) Supercooling (e) None of these
(20) The oxidation number of sulphur in H2SO4 is:
(a) – 2 (b) +2 (c) + 5
(d) + 4 (e) None of these

Chemistry Mcqs For Public Service Exams