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.
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
The uncovered raw food that is sold along major roads is likely to contain some amounts of
Pb
Cu
Ag
Na
Correct answer is A
The uncovered raw food that is sold along major roads is likely to contain some amounts of lead(Pb).
The vulcanizer's solution is prepared by dissolving rubber in
ethanol
kerosine
benzene
petrol
Correct answer is C
Dissolved rubber in benzene makes the vulcanizer's solution.
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
white
pink
red
blue
Correct answer is B
Blue anhydrous cobalt (II) chloride changes to pink in water
large particles
germs
fine particles
odour
Correct answer is C
Potash alum [kAl(S\({O}_4\))\(_2\)] n sodium aluminate (ii) (NaHCO\(_2\)) are added to cause coagulation.
As fine particles to clump together, forming large particles heavy enough to settle at the bottom of the tanks as impurities.
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