Paper 1  Objectives  45 Questions
JAMB Exam
Year: 1984
Level: SHS
Time:
Type: Question Paper
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#  Question  Ans 

1. 
Sodium chloride may be obtained from brine by A. titration B. decantation C. distillation D. evaporation E. sublimation 
D 
2. 
20 cm ^{3} of hydrogen gas are sparked with 20cm ^{3} of oxygen gas in an endimoeter at 373k (100 ^{o}C) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 ^{o}C) and passed over calcium chloride. The volume of the residual gas is A. 40 cm ^{3} B. 20 cm ^{3} C. 30 cm ^{3} D. 10cm ^{3} E. 5cm ^{3}
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Detailed Solution2H_{2} + O_{2} 2H_{2}O2V 1V 2V 20cm^{3} 20cm^{3}  20cm^{3} 10cm^{3} 20cm^{3} Residual gas = 20cm^{3}  10cm^{3} of 0_{2} = 10^{3} 

3. 
For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1) A. 2.24 dm ^{3} B. 2.24 cm^{3} C. 12^{3} D. 12dm ^{3} E. 48 dm ^{3}
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Detailed Solution\(NH_{4}NO_{2}\) \(\to\) \(N_{2}\) + \(2H_{2}O\)\(64g\) \(\to\) \(22.4dm^{3}\) \(3.2g\) will give \(\frac{22.4}{64}\) \(\times\) \(\frac{3.2}{64}\) = \(1.12dm^{3}\) 

4. 
A molar solution of caustic soda is prepared by dissolving A. 40 g NaOH in 100 g of water B. 40 g NaOH in 1000 g of water C. 20 g NaOH in 500 of solution D. 20 g NaOH in 1000 g of solution E. 2o g NaOH in 80 g of solution
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Detailed SolutionA molar solution implies concentration in terms of moles/liter. The respective atomic weights for NaOH are: Na  23,0  16 and H  1, so the molecular weight, is 23 + 16 + I = 40. Thus 40 grams of NaOH equals one mole of NaOH, and a 1 molar solution of NaOH will contain 40 grams of NaOH chemical in 1000grams of water. 

5. 
Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam? A. 1 and 2 B. 2 and 3 C. 3 and 4 D. 1, 2, and 3 E. 2, 3, and 5 
B 
6. 
Naphthalene when heated melts at 354 K (81 ^{o}C). At this temperature the molecules of naphthalene A. decompose into smaller molecules B. change their shape C. are oxidized by atmospheric oxygen D. contract E. become mobile as the inter molecular forces are broken 
E 
7. 
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is A. 2:1 B. 1:1 C. 1:2 D. 1:4 E. 1:8 
A 
8. 
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is A. H_{2}SO_{4} + Al(OH)_{2} \(\to\) 2H_{2}O + AlSO_{4} B. 3H_{2}SO_{4} + 2Al(OH)_{3} \(\to\) 6H_{2}O + Al_{2}(SO_{4})_{3} C. 3H_{2}SO_{4} + 2AlH \(\to\) 6H_{2}O + Al(SO_{4})_{3} D. 3H_{2} SO_{4} + 2Al(OH)_{3} \(\to\) Al(SO_{4})_{3} E. H_{2}SO_{4} + Al(OH)_{3} \(\to\) H_{2}O + Al_{2}(SO_{4})_{3} 
B 
9. 
Which of the following mixtures would result in a solution of pH greater than 7? A. 25.00 cm^{3} of 0.05 M H_{2}SO_{4} and 25.00cm^{3} of 0.50 M Na_{2}CO_{3} B. 25.00 cm^{3} of 0.05 M H_{2}SO_{4} and 25.00 cm^{3} of 0.10 M NaHCO_{3} C. 10 M NaOH D. 25.00cm^{3} of 0.11 MH_{2} SO_{4} and 50.00 cm^{3} of 0.05 M NaOH E. 25.00cm^{3} of 0.25 M H_{2}SO_{4} and 50.00cm^{3} of 0.20 M NaOH 
A 
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