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Chemistry
UTME / JAMB 2022
Basic Chemistry
Solution
An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]
A
C\(_4\)H\(_12\)O
B
C\(_3\)H\(_9\)O
C
C\(_4\)H\(_9\)O
D
C\(_3\)H\(_8\)O
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2022
Basic Chemistry
Solution
Which of the following best represent solid gas mixture?
A
milk
B
kerosene
C
soil
D
smoke
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2022
Basic Chemistry
Solution
H\(^+\) + OH\(^-\) → H\(_2\)O
The equation above illustrates
A
precipitation
B
hydration
C
hydrolysis
D
neutralization
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2022
Basic Chemistry
Solution
Which of the following gases is alkaline?
A
N\(O_2\)
B
C\(O_2\)
C
N\(H_3\)
D
\(N_2\)O
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
The atomic weight of nitrogen is?
A
10
B
12
C
14
D
16
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
The maximum electron in N shell is?
A
2
B
8
C
18
D
32
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
The mass number of a nucleus is?
A
Always less than its atomic number
B
The sum of the number of protons and neutrons present in the nucleus
C
Always more than the atomic weight
D
A fraction
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
The mass of one Avogadro number of helium atoms is?
A
1.00gram
B
4.00gram
C
8.00gram
D
6.00gram
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
220g of carbon dioxide contains ----- moles
A
5
B
6
C
3
D
4
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
The nucleus of an atom consists of?
A
Electrons and neutrons
B
Electrons and protons
C
Protons and neutrons
D
None of the above
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Basic Chemistry
Solution
The process by which salt and water reacted in a limited way to form an acid or a base is?
A
Neutral process
B
Basic acidic process
C
Hydrolysis
D
Sublimation
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2021
Basic Chemistry
Solution
The Bohr model of the atom proposed the existence of?
A
the nucleus
B
electron shells
C
nucleons
D
neutrons
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2020
Basic Chemistry
Solution
The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO\(_3\) is treated with 0.2dm\(^3\) of 1 Mole of HCL in the equation
CaCO\(_3\) + 2HCL ⇒ CaCl\(_2\) + H\(_2\) O + CO\(_2\) , is?
A
1.00 X 10\(^{23}\)
B
6.02 X 10\(^{23}\)
C
6.02 X 10\(^{22}\)
D
6.02 X 10\(^{24}\)
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2019
Basic Chemistry
Solution
consider the following reaction equation: 2Al(OH)\(_3\) + 3H\(_2\)SO\(_4\) →Al\(_2\)(SO4)\(_3\)(aq)+6H\(_2\)O. How many moles of tetraoxosulphate(vi)acid is needed to produce 0.5mol of aluminium tetraoxosulphate(vi)?
A
0.5
B
1.0
C
1.5
D
3.0
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2014
Basic Chemistry
Solution
An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?
A
1718W
B
1817W
C
3517W
D
3518W
medium Difficulty
Study Explanation