Paper 1  Objectives  49 Questions
JAMB Exam
Year: 1991
Level: SHS
Time:
Type: Question Paper
Answers provided
No description provided
This paper is yet to be rated
Scholarship in Norway universities are open for application in 2022 also for developing countries.
Effective ways of coping with exam stress and test anxiety which is supported by Science
Norway Kvaroy Arctic Women in Aquaculture Postgraduate Scholarship Program 2022 for African Women
#  Question  Ans 

1. 
Which of the following can be obtained by fractional distillation? A. Nitrogen from liquid air B. Sodium chloride from sea water C. Iodine from a solution of Iondine in carbon tetrachloride D. Sulphur from a solution of sulphur incarbon disulphide 
A 
2. 
Which of the following are mixtures? A. i, ii and iii B. i, ii and iv C. i and ii only D. i and iv 
A 
3. 
An iron ore is known to contain 70.0% Fe_{2}O_{3}. The obtain from 80kg of the ore is? A. 35.0 kg B. 39.2 kg C. 70.0 kg D. 78.4 kg
Show Content
Detailed Solution2Fe_{2}O_{3} → 4Fe + 3O_{2}320g 224g 96g (70) / (100) x (80) / (1) 56g if 0.32kg of Fe_{2}9_{3} contains 0.224 kg Then 56kg will contain (56 x 0.224) / (0.32) =39.2 kg 

4. 
In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law of ? A. multiple proportion B. conservation of mass C. constant composition D. reciprocal proportion
Show Content
Detailed Solution0.36g of Cl combines with 0.2g of x1g of Cl will combine with \(\frac{1 \times 0.2}{0.32}\) = 0.56 0.71g of U combines with 0.49g of x 1g of U will combine with \(\frac{1 \times 0.4}{71}\) = 0.56 Ratio 0.56 : 0.56 = 1:1 

5. 
30cm\(^3\) of oxygen at 10 atmospheres pressure is placed in a 20 cm\(^3\) container. Calculate the new pressure if temperature is kept constant? A. 6.7 atm B. 15.0 atm C. 60.0 atm D. 0 atm
Show Content
Detailed SolutionP\(_1\)V\(_1\) = P\(_2\)V\(_2\) (where T is kept constant)30 x 10 = P\(_2\) x 20 P\(_2\) = \(\frac{30 \times 10}{20}\) = 15.0 atm 

6. 
Calculate the volume of carbon (IV)oxide measured at s.t.p, produced when 1 kg of potassium hydrogen trioxocarbonate (IV) is totally decomposed by heat? A. 28 dm^{3} B. 56 dm^{3} C. 112 dm^{3} D. 196 dm^{3}
Show Content
Detailed Solution2KHCOdm_{3} → K_{2}CO_{3} + H_{2}O + CO_{2}2(39 + 1 + 12 + 48) 22.4 dm^{3} 200 g 22.4 dm^{3} of CO_{2} 1000 g (1000) / (200) x 22.4 = 112 dm^{3} 

7. 
A given quantity of a gas occupies a volume of 228 cm^{3} at a pressure of 750mm Hg. What will be its volume at atmospheric pressure? A. 220 cm^{3} B. 225 cm^{3} C. 230 cm^{3} D. 235 cm^{3}
Show Content
Detailed SolutionP_{1}V_{1} = P_{2}V_{2} ∴ 750 x 228 = 760 V_{2}V_{2} = (750 x 228 cm^{3}) / (760) = 225 cm^{3} 

8. 
A sample of a gas exerts a pressure of 8.2 atm when confined in a 2.93 dm^{3} container at 20°C. The number of moles of gas in the sample is? A. 1.00 B. 2.00 C. 3.00 D. 4.00
Show Content
Detailed SolutionPV = nRT2.93 x 8.2 = 0.082 x 293 xn ∴ n = (2.93 x8.2) / (0.082 x 293) n = 1 

9. 
Atoms of element X (with 2 electrons in the outer shell). combine with atoms of Y (with 7 electrons in the outer shell). Which of the following statements is FALSE? The compound formed? A. has formula XY B. is likely to be ionic C. contains X^{2+} ions D. contains Y^{} ions
Show Content
Detailed SolutionThe compound formed by a mixture of X and Y will be \(XY_{2}\) not XY. 

10. 
The electronic configuration of an elements is 1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}. How many unpaired electrons are there in the element? A. 5 B. 4 C. 3 D. 2 
C 
Preview displays only 10 out of the 49 Questions