Answers To 2017 UTME Chemistry Likely Questions – 20 problems solved

CHEMISTRY 2017  Possible JAMB hi  questions and answers

1. CO(g) + H2O(g) → CO2(g) + H2(g). From the equation above calculate the standard heat change if the standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in Kj mol-1 are -394, -242 and -110 respectively
   A. +42kJ mol-1
   B. -262kJ mol-1
   C. -42kJ mol-1
   D. +262kJ mol-1
2. When sugar is dissolve in tea, the reaction is accomplished by
   A. a minimum entropy change
   B. no entropy change
   C. positive change
   D. negative entropy change
   
3. MnO4(aq) + 8H+(aq) + Y? Mn2+(aq) + 4H2O(l). Y in the equation above represents
   A. 5e-
   B. 3e-
   C. 2e-
   D. 7e-
   
4. If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at
   high temperature
   any temperature
   low temperature
   minimum temperature
   A. low temperature
   B. high temperature
   C. any temperature
   D. minimum temperature
   
5. In which order are the following salts sensitive to light?
   A. Agl > AgCl > AgBr
   B. AgBr > AgCl > Agl
   C. AgCl > Agl > AgBr
   D. AgCl > AgBr > Agl
   
6. Which of the following represents hybridization in ethyne?
   A. sp
   B. sp2d
   C. sp2
   D. sp3
   

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1. PCl5(g)= PCl3(g) + Cl2(g)
   In the reaction above, a decrease in pressure will
   A. Increase yield of Pcl3
   B. Accurate the reaction
   C. Increase the yield of Pcl5
   D. Decelerate the reaction

N2O4(g)⇔ 2NO2(g)
In the endothermic reaction above, more products formed will be favored by
A. an increase in pressure
B. a constant values
C. a decrease volume
D. a decrease pressure

N2(g) + O2(g) ⇔ 2NO(g); ΔH = + 180.6Kj mol-1
In the reaction above, increase in temperature will
A. decrease the quantity of O2
B. increase the quantity of N2
C. increase the yield of NO
D. decrease the yield of NO

Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises?
A. The molecular collisions become more violent
B. The bonds in the reacting molecules are more readily broken
C. The collision frequency of the molecules increases
D. lower proportion of the molecules has the necessary minimum energy to react

NH3(g) + HCl(g) → NH4Cl(s) The entropy change in the system above is
A. zero
B. indeterminate
C. positive
D. negative

The knowledge of half-life can be used to
A. Detect an element
B. irradiate an element
C. Create an element
D. split an element

A common characteristics of copper and silver in their usage as coinage metals is that they
A. are not easily reduced
B. are not easily oxidized
C. have high metallic lustre
D. are easily oxidized

Tartaric acid is used industrially to
A. make fruit juice
B. make baking powder
C. remove rust
D. dry substance

Which of the following salts will turn blue litmus paper red
A. potassium hydrogen tetra-oxosulphate (VI)
B. sodium tetra-hydroxozincate(II)
C. Zinc chloride hydroxide
D. sodium trioxocarbonate(IV)

A gas that is not associated with global warming is
A. CH4
B. CO2
C. SO3
D. H2

Fermentation is the
A. breaking down of carbohydrate to glucose
B. breaking down of sugar to carbohydrate
C. conversion of sugar to alcohol in the presence of yeast
D. conversion of alcohol to sugar in the presence of yeast

What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air?
A. 6.30cm3
B. 0.06cm3
C. 15.00cm3
D. 0.63cm3

A form of carbon used for absorbing poisonous gases and purification of noble gases is
A.carbon black
B.animal charcoal
C.wood charcoal
D. carbon fibres

Water molecules can be ligands especially when they are bonded to
A.group VII elements
B.alkali metals
C.transition metals
D. alkaline earth metals
ANSWERS

1.  C
2. B
3. A
4. B
5. D
6. A
7. C
8. D
9. C
10. C
11. D
12. A
13. B
14. A
15. A
16. D
17. C
18. A
19. C
20. C