hpsc.gov.in HCS Preliminary Exam Chemistry Question Paper : Haryana Public Service Commission
Name of the Organization : Haryana Public Service Commission
Name of the Exam : HCS (Ex.Br.) Preliminary 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/11215-Chemistry.pdf
HCS Preliminary Exam Chemistry Question Paper :
Time Allowed : Two Flours
Code : 04
Max.marks : 100
Instruction :
1. Use only BLUE Ball Point Pen.
2. In case of any defect – Misprint, Missing Question/s Get the booklet changed.
3. No complaint shall be entertained after the examination.
Related : HPSC HCS Main Exam Chemistry Question Paper : www.pdfquestion.in/11104.html
4. Before you mark the answer, read the instruction on the OMR Sheet (Answer Sheet) also before attempting the questions and fill the particulars in the ANSWER SHEET carefully and correctly.
5. There are FOUR options to each question. Darken only one to which you think is the right answer. There will be no Negative Marking.
6. Answer Sheets will be collected after the completion of examination and no candidate shall be allowed to leave the examination hall earlier.
7. The candidates are to ensure that the Answer Sheet is handed over to the room invigilator only.
8. Rough work, rt any, can be done on space provided at the end of the Question Booklet itself. No extra sheet will be provided in any circumstances.
9. Write the BOOKLET SERIES in the space provided in the answer sheet, by darkening the corresponding circles.
10. Regarding incorrect questions or answers etc. Candidates kindly see NOTE at the last page of the Booklet.
Q.1: In a zero-order reaction for every 10o rise of temperature, the rate is doubled. If the temperature is increased from 10″C to l00oC, the rate of the reaction will become
(A) 64 times
(B) 128 times
(C) 256 times
(D) 512 times
Q.2: Based on the first law of thermodynamics, which one of the following is correct?
(A) For an isothermal process, q: +w
(B) For an isochoric process, AU : -q
(C) For an adiabatic process, AU: -w
(D) For a cyclic process, g: -w
Q.3: The temperature of the system decreases in an
(A) Adiabatic compression
(B) Isothermal expansion
(C) Isothermal compression
(D) Adiabatic expansion
Q.4: The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is
(A) 102s
(B) 1020
(c) 1015
(D)1030
Q.5: In which of the following process, a maximum increase in entropy is observed?
(A) dissolution of salt in water
(B) condensation of water
(C) sublimation of naphthalene
(D) melting of ice
Q.6: In a reaction, A + B —+ Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactxnts (A and B) are doubled. rate law for the reaction can be written as
(A) Rate = klAl [B]
(B) Rate = klAl2[B]
(c) Rate = klAl[B]2
(D) Rate = klAl2[B]2
Q.7: The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the Melting of ice at OoC is
(A) 5.260 cal(mol K)
(B)0.526 cal(mol K)
(C) 10.52 ca(mol K)
(D)21.04 cal(mol K)
Q.8: The activation energy of a reaction at a given temperature is found to be 2.303 RT J mofr. The ratio of rate constant to the Arrhenius factor is
(A) 0.1
(B) 0.01
(c) 0.000l
(D) 0.02
Q.9: Which of the following is correct for philosophic sols?
(A) They are irreversible
(B) They are formed by inorganic substances
(C) They are readily coagulated by addition of electrolytes
(D) They are self-stabilized
Q.10: The time taken for l0o/o completion of a first order reaction is 20 min. Then, for 1000g completion, the reaction will take
(A)40 mins
(B)60 mins
(C)50 mins
(C)30 mins
Q.11 : Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water Eave a solution of density 1.15 ilmL. The molarity of the solution is
(A) 1.78 M
(c) 2.05 M
(B) 2.00 M
(D) 2.22 M
Q.12: The potential of a hydrogen electrode at pH : 10 is
(A) 0.se v
(B)0.00 v
(C) -0.59 v
(D) -0.059v
Q.13: Saturated solution of KNO: is used to make ‘salt bridge because
(A) Velocity of f* is greater than that of NO3-
(B) Velocity of NOr- is greater than that of K+
(C) Velocity of both K* and NO:- are nearly the same
(D) KNO3 is highly soluble in water
Q.14: Li occupies higher position in the electro chemical series of metals as compared to Cu because
(A) the standard reduction potential of Li*/Li is lower than that of Cuz*/Cu
(B) the standard reduction potential of Cu2*/Cu is lower than that of Li*,1Li
(C) the standard oxidation potential of Li Li* is higher than that of Cu/Cu2*
(D) Li is smaller in size as compared to Cu
Q.15: Corrosion of iron is an electro chemical phenomenon where the cell reaction is
(A) Fe is oxidised to Fe2* and dissolved oxygen in water is reduced to O[f
(B) Fe is oxidised to Fe3* and HzO is reduced to OH-
(C) Fe is oxidised to Fe2* and HzO is reduced to OH-
(D) Fe is oxidised to Fe2* and HzO is reduced to Oz
16. Several blocks of magnesium are fixed to the bottom of a ship to
(A) Prevent action of water and salt
(B) Keep away the sharks
(C) Prevent puncturing by under-sea rocks
(D) Make the ship lighter
17. If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately
(A) 45 minutes
(C) 40 minutes
(B) 60 minutes
(D) 50 minutes
18. Which of the following electrolytic solutions has the least specific conductance?
(A) 0.02 N
(B) 0.2 N
(D) 0.002 N
(c)2N
Q.19: A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows
(A) Negative deviation from Raoult’s law
(B) Positive deviation from Raoult’s law
(C) No deviation from Raoult’s law
(D) Positive or negative deviation from Raoult’s law depending upon the composition
Q.20: Which one of the following statement is incorrect about enzyme catalysis?
(A) Enzymes are denaturated by ultraviolet rays and at high temperature
(B) Enzymes are least reactive at optimum temperature
(C) Enzymes are mostly proteinous in nature
(D) Enzyme acts at specific site