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.
I and II only
I, II and III only
II and III only
II, II and IV only
III and IV only
Correct answer is A
No explanation has been provided for this answer.
The high boiling point of hydrogen fluoride can be explained in terms of
covalent bonds.
dative bonds.
dipole-dipole bonds.
electrovalent (ionic) bonds
hydrogen bonds.
Correct answer is E
No explanation has been provided for this answer.
The oxidation number of X in \(XO_{4}^{3-}\) is
1
-2
3
4
5
Correct answer is E
The oxidation number of O is 2-
Therefore, let the oxidation number of X be a
a + (-2 x 4) = -3
a - 8 = -3
a = -3+8
a = 5
How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
10.0 g
4.0g
2.0 g
1.0g
0.1 g
Correct answer is D
no of moles of Na = molar concentration X volume
= 0.1 x \(\frac{250}{1000}\) = 0.025
no of moles = \(\frac{m}{M}\)
mass = no of mles x molar mass = 0.025 x 40 = 1.0g ( molar mass of NaOH = 40g/mol)
1:01
1:01
2:01
2:03
3:01
Correct answer is A
No explanation has been provided for this answer.