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 number of iodine in KIO3 is
+7
+3
+5
+6
Correct answer is C
If the rules are followed, it is non-negotiable that +5 is the suitable answer to the question.
400k
480k
550k
600k
Correct answer is D
At constant pressure connotes Charle's law
\(\frac{V_1}{T_1}\) = \(\frac{V_2}{T_2}\)
\(\frac{2dm^3}{300k}\) = 2 x \(\frac{2dm^3}{T_2}\)
T2= 600k
k [P]x [Q]y
\(\frac{[P]^x [Q]^y}{[R]^m [S]^n}\)
\(\frac{[R]^m [S]^n}{[P]^x [Q]^y}\)
\(\frac{m[R] n[S]}{x[P] y[Q] }\)
Correct answer is C
Expression for equilibrium constant
k = \(\frac{\text{concentration of product}}{\text{concentration of reactant}}\)
The constituent of air necessary in the rusting process are
O2 and H2O
Ar and CO2
CO2 and H2O
O2 and CO2
Correct answer is A
Rust is an iron oxide, a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.
Anhydrous CaCl2
concentrated NaCO4
dilute NaOH
concentrated H2SO4
Correct answer is A
To purify the distillate of impurities like unreacted ethanol, acids, water and ethoxyethane.
Adding anhydrous calcium chloride and leave it to stand for a day to remove any water present
in the mixture.