STPGT TRB Tripura Chemistry 2016 Paper
The mole fraction of the solute in one molal aqueous solution is
(a) 0.018
(b) 0.009
(c) 0.027
(d) 0.036
A 4:1 molar mixture of He and CH4 is stored in a container at 20 bar pressure. Due to a tiny hole in the container, the gas mixture is effusing out. The ratio of He and CH4 effusing out initially is
(a) 4 : 1
(b) 1 : 4
(c) 8 : 1
(d) None of the above
At constant pressure with increasing temperature, the mean free path of gas
(a) increases
(b) decreases
(c) does not change
(d) None of the above
When crystals of sodium chloride are heated in presence of sodium vapour, then they yellow. This is due to the formation of
(a) Schottky defect
(b) Frenkel defect
(c) F-centres
(d) H-centres
To obtain a first-order diffraction peak for a crystalline solid with inter-plane distance equal to the wavelength of incident X-ray, the angle of incidence should be
(a) 30 degree
(b) 60 degree
(c) 90 degree
(d) None of the above
A solid compound is made of two elements X and Y. In the solid, atom X is in f.c.c arrangement and atom Y occupies all the octahedral voids and alternate tetrahedral voids. The formula of the compound is
(a) XY
(b) XY2
(c) XY3
(d) XY4
The heat of neutrilization of a strong acid and a strong base is -57 kJ. The amount of heat released, when 0.50 mole of HNO3 is added to 0.20 mole of NaOH is
(a) 11.4 kJ
(b) 57.0 kJ
(c) 13.7 kJ
(d) 28.5 kJ
Which of the following statements is not correct for Kohlrausch’s law?
(a) The law is valid at infinite dilution
(b) The law is valid for weak electrolytes only
(c) The basis of the law is independent migration of ions
(d) The law is valid for all types of electrolyte
Which of the following concentration terms is independent of temperature ?
(a) Molarity
(b) Normality
(c) Molality
(d) Formality
2.52 g of oxalic acid (dihydrate, mol.wt. 126) was dissolved in 100 ml of water. 10 ml of this solution was diluted to 50 ml. The normality of the final solution is
(a) 0.16
(b) 0.08
(c) 0.04
(d) None of the above
A 5% solution of cane sugar (mol. wt. 342) is isotonic with 1% solution of a substance X. The molecular weight of X is
(a) 68.4
(b) 171.2
(c) 136.8
(d) 34.2
Which of the following statements is incorrect about Freundlich adsorption isotherm?
(a) At low pressure, the graph is nearly straight line
(b) At high pressure, the extent of adsorption is found to be independent of pressure
(c) At intermediate range of pressure, the extent of adsorption is proportional to pressure
(d) None of the above
At critical micelle concentration, potassium oleate molecules in water
(a) behave completely soluble
(b) dissociate
(c) associate
(d) None of the above
Dispersion of a solid in a liquid, a liquid in a gas and a liquid in a liquid are respectively known as
(a) aerosol, emulsion, sol
(b) sol, aerosol, emulsion
(c) emulsion, sol, aerosol
(d) None of the above
Which one of the following is an example of copolymer ?
(a) Buna-S
(b) Teflon
(c) PVC
(d) Polystyrene
The catalyst used for olefin polymerization is
(a) Wilkinson catalyst
(b) Raney nickel catalyst
(c) Merrifield resin
(d) Ziegler-Natta catalyst
The biodegradable polymer is
(a) PAN
(b) PHBV
(c) PTFE
(d) None of the above
The number of radial nodes of 3p orbital is
(a) 2
(b) 1
(c) 0
(d) None of the above
The orientation of a orbital in space is governed by
(a) principle quantum number
(b) azimuthal quantum number
(c) magnetic quantum number
(d) spin quantum number
Leave a Reply