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.
oxygen and water vapour
oxygen and nitrogen
carbon (IV) acid and noble gases
nitrogen and noble gases
Correct answer is D
No explanation has been provided for this answer.
What is the IUPAC name of the compound represented by the molecular formula NaCIO4?
Sodium tetraoxochlorate (l)
Sodium tetraoxochlorate (IV)
Sodium tetraoxochlorate (VI)
Sodium tetraoxochlorate(VII)
Correct answer is D
No explanation has been provided for this answer.
How many atoms are there in one mole of hydrogen gas? [Avogadro's constant = 6.02 x 1023mol-1]
1.2 x 10 23
6.0 x 10 23
1.2 x10 24
6.0 x 10 24
Correct answer is C
One mole of hydrogen gas has 6.02 x 1023 molecules, and one molecule of hydrogen gas contains 2 atoms of hydrogen
therefore, one mole of hydrogen gas will contain 2 x 6.02 x10^23 atoms
= 1.2 x 10^24 hydrogen atoms
13.5 g mol-1
18.5 g mol-1
47.4 g mol-1
74.0 g mol-1
Correct answer is D
250cm3 of distilled water contains 14.8g of salt(z)
1cm3 of distilled water will contain \(\frac{14.8 x 1}{250}\) of salt (z)
:. 1000cm3 of distilled water will contain \(\frac{14.8 x 1 x 1000}{250}\) = 59.2g/dm33 = \(\frac{concentration in g/dm3}{molar mass}
0.80 = \(\frac{59.2}{molar mass}\)
molar mass = \(\frac{59.2}{0.80}\) = 74.0 g/mol
Which of the following species does not contain a co-ordinate bond?
AI2CI6
CCI4
H3O+
NH + 4
Correct answer is A
No explanation has been provided for this answer.