Year :
2014
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 45 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
H 2O (g) + C (s) → H2(g) + CO(g) A. CO(g) B. C(s) C. H2O(g) D. H(2)(g) |
|
| 22. |
Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound A. 32395.5 B. 30156.3 C. 60784.5 D. 15196.5 |
|
| 23. |
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 |
|
| 24. |
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 |
|
| 25. |
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 |
|
| 26. |
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 |
|
| 27. |
Fluorine does not occur in the free state in nature because A. it is a poisonous gas B. it belongs to the halogen family C. it is inert D. of its high reactivity |
|
| 28. |
In the extraction of sodium from fused sodium chloride, the anode is made of platinum because A. sodium is formed at the anode B. chlorine is formed at the anode C. sodium does not react with platinum D. chlorine does not react with platinum Detailed SolutionBecause platinum is resistant to chlorine and water, hence in the electrolytic process, it doesn't react with any chemical and we get pure products.There is an explanation video available below. |
|
| 29. |
In the electrolytic extraction of calcium from calcium chloride, the cathode is A. zinc B. graphite C. platinum D. iron |
|
| 30. |
A compound that gives a brick-red colour to a non-luminous flame is likely to contain A. copper ions B. sodium ions C. calcium ions D. Potassium ions |
| 21. |
H 2O (g) + C (s) → H2(g) + CO(g) A. CO(g) B. C(s) C. H2O(g) D. H(2)(g) |
|
| 22. |
Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound A. 32395.5 B. 30156.3 C. 60784.5 D. 15196.5 |
|
| 23. |
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 |
|
| 24. |
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 |
|
| 25. |
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 |
| 26. |
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 |
|
| 27. |
Fluorine does not occur in the free state in nature because A. it is a poisonous gas B. it belongs to the halogen family C. it is inert D. of its high reactivity |
|
| 28. |
In the extraction of sodium from fused sodium chloride, the anode is made of platinum because A. sodium is formed at the anode B. chlorine is formed at the anode C. sodium does not react with platinum D. chlorine does not react with platinum Detailed SolutionBecause platinum is resistant to chlorine and water, hence in the electrolytic process, it doesn't react with any chemical and we get pure products.There is an explanation video available below. |
|
| 29. |
In the electrolytic extraction of calcium from calcium chloride, the cathode is A. zinc B. graphite C. platinum D. iron |
|
| 30. |
A compound that gives a brick-red colour to a non-luminous flame is likely to contain A. copper ions B. sodium ions C. calcium ions D. Potassium ions |