Saturday, 7 April 2012

POST UME, PAST QUESTIONS, ON CHEMISTRY

POST UME  PAST QUESTIONS FOR ALL TERTIARY INSTITUTIONS IN NIGERIA

SUBJECT: CHEMISTRY
ANSWER ALL THE QUESTIONS FROM THE OPTION GIVEN BELOW

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1.   There  are 2 isotopes of chlorine with mass  number 35 and 37 respectively . If the isotopes exist in the ratio 3:1 isotope being more abundant , what is the relative atomic mass  of chlorine’”.
(a)  25.5
(b)  45.5
(c)  35.5
(d)  30.5
2.   The amount of methane molecules, CH4 in 8.0  grams  of methane is?
(a)  0.5ml
(b)  45.5 ml
(c)  35.5 ml
(d)  30.5 ml
3.   The ph of a solution containing 0.5  x  10-6 m  H2SO4 is
(a)  6.3
(b) 6.5
(c)  6.0
(d)  5.0
4.   In which of the following is the oxidation number of  nitrogen zero ?
(a)  NH3
(b)  NaNO3
(c)  HNO2
(d) NCI3
5.   Which of the following techniques can be used to separate solute from a solution
(a) sieving
(b) sublimation
(c) distillation
(d)  chromatography
6.   A certain compound on analysis yielded 2.00g carbon 0.34g hydrogen and 2.67g oxygen. If the relative molecular mass of the compound is 60 , calculate its molecular formulae.
(a) C2H6O3
(b) C2H5O2
(c) CHO
(d) C2H4O2
7.   375cm3 volume of a gas has a  pressure of 770mmHq. Find the volume if the pressure is reduced to 750mmHq
(a) 385cm3
(b) 785cm 3
(c) 985 cm3
(d) 685 cm3
8.   A given mass of a gas occupies 850cm3 at 320k and o.92 x 105. Nm-2 pressure .calculate the volume
(a) 330.5cm3
(b) 541 cm3
(c) 660.5cm3
(d) 820.7cm3
9.   one faraday is equal to
(a) 9650 coulombs
(b) 96500  coulombs
(c) one mole of electrons
(d)  half a mole of electrons.
10. The solubility of alcohols in water is due to
(a)  their ionic character
(b) their low boiling point
(c) hydrogen bonding
(d) their low freezing point
11. which of the following compound is amphoteric in nature
(a) SiO2
(b) K2S
(c) CaO
(d) AI2O3
12. Which of the following allotropes of sulphur has no regular crystalline shape?
(a)  plastic sulphur
(b)  monotonic sulphur
(c) amorphous sulphur
(d) rhombioc  sulphur
13. Calculate the solubility in gdm-3 at 298k of calcium fluoride in a solution containing 0:1moldm -3 Na+ -1 (ksp of caF2 = 3.9 x 10 11 mol3 dm-9 , C2 = 40.0 , F=19.60g mol -7).
(a)   98gmol -1
(b)  78g mol -1
(c)   97gmol-1
(d)   62gmol-1
14. Find the PH of 6.05mol dm-3 phosphoric acid
(a) 2.7
(b) 0.59
(c)  0.52
(d) 0.51
15. In what ratio must 0.2mol dm -3 solution of ammonia and ammonium chloride be mixed to obtain a buffer solution of OH 4.2 (ka of NH4 + = 6.0 x 10 -10 mold m-3 )
(a) 3:1
(b) 1:4
(c) 4: 1
(d) 2:3
16. A property of a substance that can be used to obtain the heat evolved or absorbed in a chemical reaction is termed?
(a)  heat change
(b) entropy
(c) enthalpy
(d)  thermo chemistry
17. calculate the amount of heat evolved when 500kg of ammonia is produced according to the equation below N2(g) + 3H2 (g)  -à  2NH3  (g) ,dH = 91.8kj  (N=14.0; H = 1.00g mol-1)
(a)  2,35  x 10 5 kJ
(b) 3.15 x 106 kj
(c) 1.35 x 10 6kj
(d) 1.35 x106 kJ
18. Which of the following quantum numbers determines the angular momentum of the election in its orbital motion around the nucleus
(a) principal  Q.N
(b) magnetic Q.N.
(c) sub shell  Q.N.
(d) spin Q.N.

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