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.
3.01 x 1022
6.02 x 1022
6.02 x1023
1.20 x 1024
Correct answer is A
32g of sulphur = 64g / 6.02 x 10\(^{23}\) atoms of SO\(_2\)
xg of sulphur = 3.2g of SO\(_2\)
: 1.6g of sulphur is present in 3.2g / 3.01 x 10\(^{23}\) atoms of SO\(_2\)
4.00g
4.44 g
18.9 g
27.8 g
Correct answer is D
CaCO\(_3\) + 2HCI → CaCI\(_2\) + H\(_2\)O + CO\(_2\)
100g CaCO\(_3\) will produce 111g CaCI\(_2\)
25g CaCO\(_3\) will produce x ,
x = \(\frac{25 x 111}{100}\)
= 27.75 \(\approxeq\) 27.8g
MgO does not readily dissolve in water because
of its high melting point
it is a covalent compound
it forms a hydroxide when dissolved in water
its lattice energy is higher than its hydration energy
Correct answer is D
No explanation has been provided for this answer.
l only
l and ll only
l and lll only
ll and lll only
Correct answer is C
Three common factors that influence the vapor pressure of a liquid are the surface area, intermolecular forces and the temperature.
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
Na3Al(OH)4.
NaAl(OH)4
NaAl(OH)3
Na2Al(OH)3
Correct answer is B
When aluminium is treated with dilute sodium hydroxide it forms a salt called sodium tetrahydroxoaluminate and hydrogen gas.