UTME Chemistry 1986 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco
UTME Chemistry 1986 JAMB Past Questions and Answers
1. Which of the following solutions will conduct the least amount of electricity?
Options
A) 2.00 M aqueous solution of NaOH
B) 0.01 M aqueous solution of NaOH
C) 0.01 M aqueous solution of hexanoic acid
D) 0.01 M aqueous solution of sugar
The correct answer is D.
2. How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
Options
A) 3.90 x 102 coulombs
B) 5.50 x 103 coulombs
C) 6.54 x 103 coulombs
D) 2.34 x 104 coulombs
The correct answer is D.
3. Which of these represents a redox reaction?
Options
A) AgNO3 + NaCl → AgCAl + NaNO3
B) H2S + Pb(NO3) → PbS + 2HNO3
C) CaCO3 → CaO + CO2
D) Zn + 2HCl → ZnCl2 + H2
The correct answer is D.
4. 20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
Options
A) -51.O KJ mol-
B) +57.3 KJ mol-
C) +57.O KJ mol-
D) +51.0 KJ mol-
The correct answer is A.
Explanation:
NH4OH = 20cm of 0.1 m
NH4 + HCl → NH4Cl = H2O
Heat of Neutralization of NH4OH
= −1022−1022 = -51.0 KJ mole-1
5. Which of the following salts when dissolved in water will NOT give the corresponding pH value?
Options
A) NaHSO4, pH < 5
B) Na2CO3, pH > 8
C) Na2Cl,pH = 7
D) NaHCO, pH < 6
The correct answer is D.
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