Friday, September 13, 2013

CSS Chemistry Paper 1 2013

Q.1. (i) Select the best option/answer and fill in the appropriate Circle on the OMR Answer Sheet. (20x1=20)
(ii) Answers given anywhere, other than OMR Answer Sheet, shall not be considered.
1.  What happens when Al dissolves in aqueous NaOH?
(a)Forms soluble NaAl(OH)4  (b)Forms Al2 O3  (c) Precipitates of Al(OH)3
(d) Precipitates [Al(OH2 )6 ]
forms which then loses H
(e)None of these
2.  The magnetic moment of the fluoride complex is expected to be:
(a)The same as the magnetic moment of the cyanide complex.
(b)Larger than the magnetic moment of the cyanide complex because there are more unpaired
electrons in the fluoride complex.
(c)  Smaller than the magnetic moment of the cyanide complex because there are more unpaired electrons in the
fluoride complex.
(d)Larger than the magnetic moment of the cyanide complex because there are fewer unpaired electrons in the
fluoride complex.  (e)None of these
3.  When solid CoCl2 is dissolved in water, a pink solution resultsand the following equilibrium is established:
Co(H2 O)6
(aq) + 4 Cl
< = > CoCl 4
(aq) + 6 H2 O (1)
Which one of the following best describes what will happen when a concentrated HCl is added to the CoCl2
solution without changing the volume significantly?
(a)Because a solution of HCl is colorless, the color of the CoCl2solution will not change.
(b)Because HCl is a strong acid, the number of unpaired electrons in [Co(H2O)6]
, but not [CoCl4]
, will
(c) The concentration of [Co(H2O)6]
will decrease and the concentration of [CoCl4]
2-will increase; the
color of the solution will become more blue.
(d)The concentration of [Co(H2O)6]
will increase and the concentration of [CoCl4]
will decrease; the
color of the solution will become more pink.  (e)None of these
4.  Passage of electric current through the metals is due to:
(a)Oxidation reaction  (b)Reduction reaction  (c) Electrolysis
(d)Free movement of electrons  (e)None of these
5.  VBT is unable to explain the nature of some of the complexes of:
(a)Cobalt  (b)Copper  (c) Nickel  (d)Manganese  (e)None of these
6.  Energy available to do work at constant________ and _________ is known as Gibb’s free energy.
(a)Pressure, temperature  (b)Pressure, volume  (c) Temperature, volume
(d)All of these  (e)None of these
7.  A spontaneous reaction is not possible if:
(a)  ∆H and T∆S are both negative  (b)  ∆H and T∆S are Positive
(c)   ∆H is positive and T∆S is negative  (d)  ∆H is negative and T∆S is Positive (e)None of these
8.  Which is not true about thermodynamics?
(a)It ignores the internal structure of atoms and molecule.  (b)It involves the matter in bulk.
(c) It is concerned only with the initial and final states of the system.
(d)It is not applicable to macroscopic system.  (e)None of these
9.  The zero point energy of a particle is 1-D box of dimension 6A
J  (b)10
J  (c) 16.22 x 10
J  (d)10
J  (e)None of these
10.  The salt bridge in the electrochemical cell serves to:
(a)Increase the rate at which equilibrium is attained.  (b)Increase the voltage of the cell.
(c) Maintain electrical neutrality  (d)Increase the oxidation/reduction rate.
(e)None of these
The equation
) (
1 2 V V T

 is called:
(a)Gibbs’s Helmohtz equation  (b)Kirchoff’s equation  (c) Clapeyron equation
(d)Clausius Clapeyron equation  (e)None of these
12.  The hydrogen molecule may be represented by two wave functions, Ψcovalent and Ψionic and C1and C2are
coefficient indicating the weight of each function. The real wave function may be written as (N is the
normalization constant)
(a)  Ψ= N [Ψcovalent+ Ψionic]  (b)  Ψ= N [C1 Ψcovalent+ C2 Ψionic]
(c)   Ψ= N [C1 Ψcovalent x C2 Ψionic]  (d)  Ψ= (C1 + C2 ) N [Ψcovalent x C2 Ψionic]
(e)None of these
13.  Copper metal will replace silver ions in solution, resulting in the production of silver metal and copper ions. This
indicates that:
(a)Silver has a higher oxidation potential than copper. (b)A combustion reaction is occurring.
(c) Copper has a higher oxidation potential than silver. (d)Silver is much less soluble than copper.
(e)None of these
14.  According to Debye-Huckel theory of strong electrolytes,and ion moving in an atmosphere of oppositely charged
ions experiences a drag. This effect is known as the:
(a)Asymmetric effect  (b)Electrophoretic effect  (c) Inter-ionic effect
(d)Concentration effect  (e)None of these
15.  The electrical conductivity of an electrolyte depends upon:
(a)The number of molecules in the electrolyte.  (b)The number of ions present in the electrolyte.
(c) The number of ions present in the solution .  (d)The number of molecules of the solvent.
(e)None of these
16.  Brass is an alloy of:
(a)Cu and Zn  (b)Cu, Ni, Zn  (c) Cu and Ni  (d)Cu, Al, Zn (e)None of these
17.  Urea is a high quality nitrogenous fertilizer with:
(a)76% nitrogen  (b)46% nitrogen  (c) 66% nitrogen  (d)26% nitrogen  (e)None of these
18.  When Zn metal is kept in CuSO4 solution, copper is precipitated and ZnSO4is 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.  (e)None of these
19.  The most important ore of aluminium is:
(a)Bauxite  (b)Magnetite  (c) Haematite  (d)Monazite  (e)None of these
20.  The inexpensive and commonly used variety of glass is called soda glass. It is called so because:
(a)Was used initially for making bottles of soda (carbonated drink). (b)Is made using soda (sodium carbonate)
(c) Was initially used for storing sodium carbonate.  (d)Is made using soda lime.  (e)None of these
NOTE: (i)  Part-IIis to be attempted on the separate Answer Book.
(ii)Candidate must write Q. the Answer Bookin accordance with Q. the Q. Paper.
(iii)Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
(iv) Extra attempt of any question or any part of the attempted question will not be considered.
(v)  Periodic Table of Elementsis available on page-4.
(vi) Use of calculator is allowed.
Q.2.  (a).What is engineering ceramics? Describe the raw materials used in making classic
ceramic products.
(b).How urea is manufactured on commercial scale, support with a schematic diagram.
(c).In what respect does inner orbital complexes differ from an outer orbital
Q.3.  (a).Describe the oxyacids of chlorine.
(b).Describe what is meant by silane and silanol.What is their role in preparation of
(c).Define the following types of Processes:
(i)Isothermal (ii)Adiabatic (iii)Isochoric (iv)Isobaric
Page 3 of 3
Q.4.  (a).How CFT and MOT account for the fact that [CoF6]
3-is paramagnetic but
is diamagnetic?
(b).Discuss crystal field splitting in complexes having different geometries?
(c).What are the raw materials for the production of calcium superphosphate and
Q.5.  (a).Derive Schrodinger wave equation and calculate the e
nergy of the particle in
one dimensional box having length α.
(b).What are the hazardous effects of acid rain and global warming on plants?
Q.6.  (a).How Debye-Huckel theory is applied to determine activity and activity
coefficients for strong electrolytes? Derive its mathematical form.
(b).How standard electrode potential is measured?
(c).What is de Broglie hypothesis?
Q.7.  (a).How chorine is produced on industrial scale?
(b).How Werner’s Theory explains the structure of coordination compounds?
(c).Why the Ozone Layer exists at a certain altitude in Stratosphere?
Q.8.  (a).Give the applications of chelates in biological and analytical systems.
(b).What are the advantages of semiconductive devices?
(c).Derive mathematical form ofClausius-Clapeyron equation.

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