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Threshold - 3: (Physical - Basic Level): Mock Entrance Test for admission into MSc Chemistry
X to the power y is written as X^y. 10 to the power -3 is written as 10^-3
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1. Solubility product of a salt AB is 1 X 10^-8 M^2 in a solution in which the concentration of A+ ions is 10 ^-3 M. The salt will precipitate when the concentration of B- ions is maintained
2 points
> 10^-5 M
between 10^-8 M to 10^-7 M
between 10^-7 M to 10^-6 M
< 10^-8 M
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2. When a quantity of electricity is passed through CuSO4 solution, 0.16 g of copper gets deposited. If same quantity of electricity is passed through acidulated water then the volume of H2 liberated at STP will be: (atomic weight of copper = 64)
2 points
4 cm^3
65 cm^3
604 cm^3
56 cm^3
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3. In qualitative analysis in order to detect second group basic radical, H2S gas is passed in the presence of dilute HCl to
2 points
increase the dissociation of H2S
increase the dissociation of salt solution
decrease the dissociation of salt solution
decrease the dissociation of H2S
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4. The compounds A and B are mixed in equimolar proportions to form the products A + B <===> C + D. At equilibrium, one third of A and B are consumed. The equilibrium constant for the reaction is:
2 points
0.25
0.5
2.5
5.0
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5. The concentration of a reactant X decreases from 0.1 M to 0.025 M in 40 min. if the reaction follows first order kinetics, then the rate of the reaction when the concentration of X is 0.01M will be:
2 points
1.73 X 10^-4 M min^-1
1.73 X 10^-5 M min^-1
3.47 X 10^-4 M min^-1
3.47 X 10^-5 M min^-1
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6. A process is taking place at constant pressure and pressure, then
2 points
ΔH = 0
ΔH = Δ
Δs = 0
ΔH = TΔS
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7. The enthalpy of combustion of methane at 25 degree centigrade i9s 890 KJ. The heat liberated when 3.2 gram of methane is burnt in air is:
2 points
-590 KJ
178 KJ
445 KJ
872 LJ
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8. The exchanger capacity increases with increase in pH of
2 points
Anion exchange resin
Cation exchange resin
Both first and second options are correct
none of these
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9. Which on e of the following is a correct option?
2 points
Coordination number of hexagonal close pack is 14
A CCP structure has 8 tetrahedral and 4 octahedral voids per unit cell
The radius ratio range for the coordination number 6 is 0.414 - 0.732
metallic bonds are directional
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10. The comppound insoluble in acetic acid is:
2 points
calcium hydroxide
calcium carbonate
calcium oxalate
calcium oxide
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