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.
The oxidation state of carbon in HCOOH is
-1
+2
+3
zero
Correct answer is B
HCOOH
O.N of H + O.N of C + 2* O.N of oxygen of
H = 0
1 + X + 2X - 2 + 1 = 0
2 + X -4 = 0
X = 4 - 2 = +2
Insoluble salts can be prepared by?
titrating an alkali against an appropriate acid
reacting an acid with trioxocarbonate (IV) salt
directing combination of the elements which make up the salt
mixing two soluble compounds containing the metallic radical and the acidic radic
Correct answer is D
An insoluble salt can be prepared by a precipitation method through a double decomposition reaction.
Two soluble metal salts react with each other to form one soluble salt and one insoluble salt .
Lead nitrate solution and sodium chloride solution react to produce solid lead chloride , leaving soluble sodium nitrate in solution.
The lead chloride can be recovered by filtration.
0.016 mol dm-3
0.032 mol dm-3
0.039 mol dm-3
0.064 mol dm-3
Correct answer is D
HCl + NaOH → NaCl + H2O
CAVA = NA/NB = (0.05 * 32)/(CB * 25)
∴ CB = (0.05 * 32)/25 = 0.064 mol dm-3
1
2
3
4
Correct answer is A
The basicity of CH3COOH is 1. Which means it has just one ionizable ion.
What is the pH of 0.001 mol dm-3 solution of sodium hydroxide
14
13
12
11
Correct answer is D
\([H^+] [OH^-] = 10^{-14}\)
\([H^+] = 10^{-14}/[OH^-] = 10^{-14}/(1 * 10^{-3}) = 10^{-11}\)
pH = -Log10[H+]
= - Log10[10-11] = - 1 * -11 Log10[10-11] = 1 = -1 * -11 * 1 = 11