Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
24,125 C
48,250 C
72,375 C
96,500 C
Correct answer is B
4OH ⇒ 2H\(_2\)O + O\(_2\) + 4e-
From the equation:
1 mole of Oxygen requires 4e
i.e 1 mole of Oxygen requires 4F,
where 1F = 96,500 C
[ 4 X 96,500 X 0.125 ] ÷ 1
= 48,250 C
MCl
MCl\(_2\)
MCl\(_3\)
M\(_2\)Cl\(_6\)
Correct answer is C
| M | Cl | |
| % composition | 20.22 | 79.78 |
| Atomic mass | 27 | 35.5 |
| Mole ratio | 20.22 | 79.78 |
| 27 | 35.5 | |
| 0.75 | 2.25 | |
| Divided | 0.75 | 0.75 |
| 1 | 3 |
The formula of the Chloride = MCl\(_3\)
26.0kj/mol
65.0kj/mol
130.0kj/mol
260.0kj/mol
Correct answer is B
32g of CUSO\(_4\) liberate 13.0kj of heat
Molar mass of CUSO\(_4\) = 160g
No. of moles of CUSO\(_4\) = 32g
No. of moles = 32(mass) / 160(molar mass)
= 0.2 moles
i.e 0.2 = 13kj
1 moles = xkj
: 65KJ
Helium is used in observation of ballons because it is?
Light and combustible
light and non-combustible
heavy and combustible
heavy and non-combustible
Correct answer is B
Helium floats because it is buoyant; its molecules are lighter than the nitrogen and oxygen molecules of our atmosphere and so they rise above it
Deliquescent substances are also?
efflorescent
anhydrous
hygroscopic
insoluble
Correct answer is C
Deliquescence, the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution. Deliquescence occurs when the vapour pressure of the solution that is formed is less than the partial pressure of water vapour in the air. A particular example of hygroscopic behavior is deliquescence which is exhibited by many water-soluble solids, including inorganic salts (e.g., calcium chloride).