Organisation : Teachers’ Recruitment Board, Tripura
Exam : STPGT – Selection Test for Post Graduate Teachers
Document Type : Previous Year Question Paper
Subject : Chemistry
Code No : AF17—XVIII
Year : 2017
Website : https://trb.tripura.gov.in/
TRB Tripura STPGT Chemistry Previous Question Paper
Question Paper of TRB Tripura Selection Test for Post Graduate Teachers Chemistry Question Paper 2017 is now available in the official website of Teachers’ Recruitment Board, Tripura.
Related : TRB Tripura STPGT Commerce Question Paper 2017 : www.pdfquestion.in/29569.html
Instructions for Candidates
1. Use Black Ballpoint Pen only for writing particulars of this Question Booklet and marking responses on the OMR Answer Sheet.
2. This test is of 2 hours and 30 minutes duration and consists of 75 MCQ-type questions. Each question carries 2 marks.
3. There is no negative marking for any wrong answer.
4. Rough work should be done only in the space provided in the Question Booklet.
5. The answers are to be marked on the OMR Answer Sheet only. Mark your responses carefully since there is no chance of alteration/correction.
6. Use of eraser or whitener is strictly prohibited.
Download Question Paper :
https://www.pdfquestion.in/uploads/STPGTChe.pdf
Model Questions
Direction : Answer the following questions by selecting the correct option.
1. Sulphuric acid reacts with sodium hydroxide as follows :
H2SO4 + 2NaOH = Na 2SO4 + 2H2O When 1 L of 0·1 M H2SO4 solution is allowed to react with 1 L of 0·1 M NaOH solution, then the molarity ofNa 2SO4 in the solution obtained is
(A) 0·10
(B) 0·05
(C) 0·025
(D) 0·20
2. Mole fraction of the solvent in aqueous solution of NaOH having molality of 3 is
(A) 0·3
(B) 0·05
(C) 0·7
(D) 0·95
3. 4 g of hydrogen reacts with 20 g of oxygen to form water. The mass of water formed is
(A) 22·5 g
(B) 24 g
(C) 36 g
(D) 40 g
4. If the equivalent weight of a metal M is x and the formula of its oxide is MmOn , then the atomic weight of the metal M will be
(A) 2xn/m
(B) 2mn/x
(C) 2xm/n
(D) None of the above
5. The amount of oxygen required for complete combustion of a gaseous hydrocarbon is five times of its volume and the gaseous mixture produced after combustion, on haking with KOH solution contraction occurs three times of the volume of taken hydrocarbon. The formula of the hydrocarbon is (all volumes are measured at same temperature and pressure)
(A) CH4
(B) C2H6
(C) C3H8
(D) C2H2
6. The compressibility factor for a real gas at high pressure is
(A) 1+ Pb/RT
(B) 1- Pb/RT
(C) 1+ RT/Pb
(D) 1
7. Equal weight of methane and hydrogen are mixed in an empty container at 25 ºC. The fraction of the total pressure exerted by hydrogen is
(A) 16/17
(B) 8/9
(C) 1/2
(D) 1/9
8. The average velocity of an ideal gas molecule at 27 ºC is 0·3 m/sec. The average velocity at 927 ºC will be
(A) 0·6 m/sec
(B) 0·9 m/sec
(C) 3 m/sec
(D) 0·3 m/sec
9. The SI unit of viscosity coefficient (h) is
(A) pascal
(B) Km-2s
(C) Nm-2
(D) Nm-2s
11. CsBr has bcc structure and its length is 4·3 Å. The shortest interionic distance in between Cs+ and Br – is
(A) 1·86 Å
(B) 3·72 Å
(C) 4·30 Å
(D) None of the above
12. A crystal has the lattice parameters a = b = c and a = g = 90º, b ¹ 90º. The crystal system is
(A) rhombohedral
(B) monoclinic
(C) tetragonal
(D) orthorhombic
13. When crystals of NaCl are heated in the presence of sodium vapour, they turn yellow colour. This is due to the formation of
(A) Schottky defect
(B) Frenkel defect
(C) F-centres
(D) H-centres
14. The coordination number of the Ca 2+ ion in CaF2 is 8. The coordination number of the F – ion is
(A) 1
(B) 2
(C) 4
(D) 8
15. The band structure in an n-type semiconductor is
(A) I
(B) II
(C) III
(D) IV
16. Among the following sets, a set of intensive variable is
(A) pressure, temperature, enthalpy
(B) enthalpy, temperature, volume
(C) volume, temperature, heat capacity
(D) density, temperature, pressure
18. The change in entropy when 2 moles of argon gas are heated at constant volume from 300 K to 500 K is (given log 5/3 = 0·2218)
(A) –12·74 J/K/mol
(B) –6·37 J/K/mol
(C) 6·37 J/K/mol
(D) 12·74 J/K/mol
19. The specific heat of a gas is 0·075 calorie at constant volume and its formula weight is 40. The atomicity of the gas would be
(A) 1
(B) 2
(C) 3
(D) 4
20. Consider the following reactions :
HCl + NaOH ®NaCl + H2O+ x cal H2SO4 + 2NaOH ®Na 2SO4 + 2H2O+ y cal Then
(A) x = y
(B) x = 2y
(C) x = y2
(D) x = y
21. 22. The pH of a 10 ml aqueous solution of HCl is 4. The amount of water is to be added to this solution in order to change its pH from 4 to 5 is
(A) 30 ml
(B) 60 ml
(C) 90 ml
(D) 120 ml
23. In which among the following reactions, the equilibrium is not affected by an increase in pressure?
(A) 2 SO3(g),2SO2(g)+ O2(g)
(B) H2(g)+ I2(s),2HI(g)
(C) C(s)+ H2O(g),CO(g)+ H2(g)
(D) 3Fe (s)+ 4H2O(g), Fe 3O4(s)+ 4H2 (g)
24. Under the equilibrium conditions for the reaction C(s)+ CO2(g),2CO(g) the total pressure is 12 atm. The value of K p is
(A) 16
(B) 32
(C) 2
(D) None of the above
25. The precipitate of CaF2 (Ksp = 1·7×10-10) obtained, when equal volume of which of the following are mixed?
(A) 10-4 M Ca 2+ +10-4 M F –
(B) 10-5 M Ca 2+ +10-3 M F –
(C) 10-3 M Ca 2+ +10-5 M F –
(D) 10-2 M Ca 2+ +10-3 M F –
26. The pKa of a weak acid, HA, is 4·80 and pK b of a weak base, BOH, is 4·78. The pH of an aqueous solution of their corresponding salt, BA, will be
(A) 4·29
(B) 7·01
(C) 9·22
(D) None of the above
27. During the recharging of lead-acid storage cell, the reaction at anode is
(A) Pb2+ ®Pb
(B) Pb2+ ®Pb4+
(C) Pb®Pb2+
(D) Pb4+ ®Pb2+
28. Zn|Zn+2(aq)||Cu2+ (aq)|Cu; Eº value for the cell is 1·10 volt at 25 ºC. The equilibrium constant for the cell reaction is of the order of
(A) 10-37
(B) 10-17
(C) 1017
(D) 1037
29. For a reaction involving two steps given below :
1st step G,2H 2nd step G +H ®P Assuming that first step attains equilibrium rapidly, the rate of formation of P is proportional to
(A) [G ]1/2
(B) [G ]
(C) [G ]3/2
(D) [G ]2
30. The rate of a chemical reaction doubles for every 10 ºC rise of temperature. If the temperature is raised by 50 ºC, the rate of reaction increases by about
(A) 10 times
(B) 24 times
(C) 32 times
(D) None of the above