STPGT TRB Tripura Chemistry 2017 Paper
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
4 g of hydrogen reacts with 20 g of oxygen to form water. The mass of water formed is
(a) 22.5 g
(b) 24.0 g
(c) 36.0 g
(d) 40.0 g
Equal weight of methane and hydrogen are mixed in an empty container at 25 degree Celcius. The fraction of the total pressure exerted by hydrogen is
(a) 16/17
(b) 8/9
(c) 1/2
(d) 1/9
The average velocity of an ideal gas molecule at 27 degree Celcius is 0.3 m/sec. The average velocity at 927 degree Celcius will be
(a) 0.6 m/sec
(b) 0.9 m/sec
(c) 3 m/sec
(d) 0.3 m/sec
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
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
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
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
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
The rate of chemical reation doubles for every 10 degree Celcius rise of temperature. If the temperature is raised by 50 degree Celcius, the rate of reaction increases by about
(a) 10 times
(b) 24 times
(c) 32 times
(d) None of the above
Negative deviation from Raoult’s law is observed in which of the following binary liquid mixtures ?
(a) Acetone and CS2
(b) Chloroethane and bromoethane
(c) Acetone and CHCl3
(d) Benzene and toluene
Which of the following concentration term are independent of temperature ?
(a) Molarity and molality
(b) Molality and normality
(c) Molality and mol fraction
(d) Mol fraction and normality
Which of the following colloids has minimum protecting power ?
(a) Gelatin (gold number = 0.01)
(b) Dextrin (gold number = 15)
(c) Potato starch (gold number =25)
(d) Albumin (gold number = 0.25)
Which property of the colloids is NOT dependent on the charge of colloidal particles ?
(a) Coagulation
(b) Electrophoresis
(c) Electroosmosis
(d) Tyndall effect
The key step in the synthesis of Nylon-6 invloves
(a) Hofmann rearrangement
(b) Beckmann rearrangement
(c) Fries rearrangement
(d) Curtius rearrangement
The polymer which is fully fluorinated is
(a) neoprene
(b) PVC
(c) Dacron
(d) Teflon
The monomer unit of PHBV is
(a) 3-hydroxybutanoic acid and 2-hydroxypentanoic acid
(b) 3-hydroxybutanoic acid and 2-hydroxybutanoic acid
(c) 3-hydroxybutanoic acid and 3-hydroxypentanoic acid
(d) glycine and aminocaproic acid
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