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Chemistry UTME / JAMB 2014 Water, Solutions & Solubility
Water is said to be temporarily hard when it contains
A
Ca (HCO3)2 and Mg (HCO3)2 salts
B
Ca (HCO3)2 and CaCO3 SALTS
C
Mg(HCO3)2 and CaSO4 salts
D
CaSO4 and Ca(HCO3)2 salts
medium Difficulty
Chemistry UTME / JAMB 2014 Water, Solutions & Solubility
On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as
A
efflorescence
B
deliquescence
C
hygroscopy
D
hydrolysis
medium Difficulty
Chemistry UTME / JAMB 2014 Stoichiometry, Mole Concept & Volumetric Analysis
16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20oC, calculate the solubility of the solute in moldm-3 [Pb = 207, N = 14, O = 16]
A
0.05 g
B
2.00 g
C
1.00 g
D
0.50g
medium Difficulty
Chemistry UTME / JAMB 2014 Acids, Bases, pH & Salts
Which of the following salts will turn blue litmus red?
A
Sodium tetrahydroxozincate (ll)
B
Sodium hydrogentetraoxosulphate (VI)
C
Sodium trioxocarbonate (lV)
D
Zinc chloride hydroxide
medium Difficulty
Chemistry UTME / JAMB 2014 Oxidation, Reduction & Redox Reactions
Zn (s) + CuSO 4(aq) → ZnSO 4(aq) + Cu (s) In the reaction above, the oxidation number of the reducing agent changes from
A
0 to + 4
B
0 to + 2
C
+ 1 to + 2
D
+ 1 to + 3
medium Difficulty
Chemistry UTME / JAMB 2014 Oxidation, Reduction & Redox Reactions
\(H_2O_{(g)} + C_{(s)} → H_{2(g)} + CO_{(g)}\) The oxidizing agent in the reaction above is
A
CO(g)
B
C(s)
C
H2O(g)
D
H(2)(g)
medium Difficulty
Chemistry UTME / JAMB 2014 Electrolysis & Electrochemical Cells
Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound [Cu=64, F = 96500 Cmol-1]
A
32395.5
B
30156.3
C
60784.5
D
15196.5
medium Difficulty
Chemistry UTME / JAMB 2014 Electrolysis & Electrochemical Cells
How many faraday of electricity is required to produce 0.25 mole of copper?
A
1.00F
B
0.01F
C
0.05F
D
0.50F
medium Difficulty
Chemistry UTME / JAMB 2014 Water, Solutions & Solubility
The dispersion of a liquid in a liquid medium will give
A
an emulsion
B
a fog
C
a gel
D
an aerosol
medium Difficulty
Chemistry UTME / JAMB 2014 Stoichiometry, Mole Concept & Volumetric Analysis
The major and most effective way of controlling pollution is to
A
improve machinery so that the substances released from combustion are less harmful
B
pass strict laws against it by individuals and companies
C
educate people on the causes and effects of pollution
D
convert chemical wastes to harmless substances before releasing them into the environment
medium Difficulty
Chemistry UTME / JAMB 2014 Stoichiometry, Mole Concept & Volumetric Analysis
The basicity of CH3COOH is
A
4
B
1
C
2
D
3
medium Difficulty
Chemistry UTME / JAMB 2014 Stoichiometry, Mole Concept & Volumetric Analysis
The mathematical expression of PH is
A
log 10[OH-]
B
log 101/[H 3 O+]
C
log 10[H 3 O+]
D
log 101/[OH -]
medium Difficulty
Chemistry UTME / JAMB 2014 Chemical Energetics & Thermochemistry
If the change in free energy of a system is -899 Jmol-1 and the entropy change is 10Jmol-1k-1 at 250C, calculate the enthalpy change.
A
+2081 Jmol-1
B
-2081 Jmol-1
C
-649 Jmol-1
D
+649 Jmol-1
medium Difficulty
Chemistry UTME / JAMB 2014 Reaction Rates & Chemical Equilibrium
In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?
A
Equilibrium constant is very large
B
∆H - T∆S = O
C
∆ H > T ∆ S
D
Equilibrium constant is less than zero
medium Difficulty
Chemistry UTME / JAMB 2014 Chemical Energetics & Thermochemistry
In a chemical reaction, the change in concentration of a reactant with time is
A
entropy of reaction
B
enthalpy of reaction
C
rate of reaction
D
order of reaction
medium Difficulty
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