Name of the Organization : Haryana Public Service Commission
Name of the Exam : HCS (Ex.Br.) Main Exam
Subject : Chemistry
Document Type : Previous Question Paper
Year : 2014
Website : http://hpsc.gov.in/en-us/
Download Sample/Model Question Paper : https://www.pdfquestion.in/uploads/11104-Chemistry.pdf
HCS Main Exam Chemistry Question Paper :
Chemistry
Code : 04)
Time : 3 Hours
M.M.: 150
Related : HPSC HCS Main Exam Botany Question Paper : www.pdfquestion.in/11100.html
Note :
(i) Attempt five questions. A1l questions carry equal marks. Question number I is compulsory. Answer any two questions from part I and true questions from part II. the parts of the same questions must be answered togelher and must not be interposed bellmen answers 1o other questions.
(ii) In case of any discrepancy in the English and Hindi versions, English version willbe taken as final.
Q 1. Write short note on any six of the following :
a) Rcsonance and Resonance energy.
b) Langmuir Isotheorem
c) ‘HNMR spectra
d) SHE
c) John Teller Effect
t) Aldol condensation
g) Organic Polymers
h) Plank’s Formulation
Part -I :
Q 2 a) The potential energy of electron in H atom is -1.70 ev. Find the excited state of the electronic
(b) Oxygen molecule is paramagnetic. Explain on the basis of Molecular Orbital Theory (MOT) (5)
c) Which compounds among the following will give green colour in its flame test (5)
i) MgCl, ii) BaCl, iii) NaCl iv) CaCl,
(d) In a beaker, a copper rod is dipped rn HCL whiie in an other beaker another copper rod is dipped in rvater, explain in the reactions occurring in these two beakers’
(e) Explain in brief Bragg’s Law
(f) Explain transition contraction’
(b) Explain the increase / decrease in entropy in the following reacttons
i) Liquid converted into solid
ii) Temperature of a solid increased from O’Kto 115’K
c) Explain collision theory and transition state theory’
Q 4. Write short notes on
i) Chemical potential and Gibb’s-Duham cquation’
ii) d-Orbital spiiaing and geometry of co-ordinate complexes’
(b) Explain the following
i) LiF is sparingly soluble in water whereas LiI is soluble’
ii) I P of Boron is less, still it does not form ionic compounds
Part : II :
Q 5 a) Explain while writing a note on ihe following :
i) Reactive intermediates, their structures and stability.
ii) Singlet and triplet states.
iii) SN’ and SN’reaction mechanisms
(b) Explain reaction mechanisms of
i) Reformatsky reaction
ii) Reimer-Tiemann reaction
Q 6. Explain the followings with reasons
a) Vinayl halide is an aliphatic compound but its reactivity is similar to aryl halides . (2×7.5=15)
b) o-complex and ll-complexes
Physics :
1. Which of the following implices the greatest precision?
(A) l0.l
(B) 10.10
(C) 10.100
(D) 10.1000
2. Which of the following is NOT one of the fundamental quantities in physics?
(A) time
(B) length
(C) Weight
(D) Mass
3. SI unit of the power of a lens is
(A) diopter
(B) horse power
(C) meter
(D) watt
4. In physics a radians per second is a unit of
(A) angular displacement
(B) angular velocity
(C) angular acceleration
(D) angular momentum.
5. A body of mass m moving with velocity u collides with a stationary body,of mass 2m and coalesce to from one body. The speed of the system after collision is
(A)3u
(B) u/3
(C) 2u
(D) u/4
6. For an object moving in uniform circular motion with constant speed. the direction of The instantaneous acceleration vector is
(A) tangent to the path of motion
(B) equal to zero
(c) directed radially outward
(D) directed radially , inward
7. The acceleration due to gravity on the moon is 1.6 meters per second square. On the moon. the time period of a pendulum whose length is 6.4 meters will be
(A) n seconds
(B) 2n seconds
(Cl) 4 seconds
(D) 22/7 seconds
8. Bernoulli’s Principle is a statement of
(A)energy conservation in dynamic fluids.
(B) momentum conservation in dynamic fluids.
(C) hydro static equilibrium.
(D) thermal equilibrium in fluids.
9. In any collision, the parameter which is conserved is
(A) kinetic energy
(B) angular Momentum
(C) linear Momentum
(D) potential energy
10. The work done by any friction force is
(A) always positive
(B) always negative
(C) always zero
(D) either positive or negative depending upon the situation