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 Fe in [Fe(CN)\(_6\)]\(^{3-}\) is
+3
+2
-2
-3
Correct answer is A
Let the oxidation number of Fe in the compound [Fe(CN)\(_6\)]\(^{3-}\) be x.
x + 6(-1) = -3
x - 6 = -3;
x = -3 + 6
x = +3
l and lll only
ll and lll only
l and ll only
l, ll and lll
Correct answer is C
No explanation has been provided for this answer.
Particle size of CuO(s)
Concentration of H2SO4(aq)
Temperature of the reacting mixture
Pressure of reaction system
Correct answer is D
The reaction rate between a solid and liquid will not be affected by pressure. Pressure majorly affects the reaction rate for gases.
A spot of oil paint on a shirt can best be removed using?
brine
detergent
kerosine
warm water
Correct answer is C
To remove oil paints, the use of chemicals is usually required, including turpentine, acetone, kerosene, and various paint thinners.
The hydrolysis of NH\(_4\)CI gives
an acidic solution
an alkaline solution
a buffer solution
a neutral solution
Correct answer is A
When you dissolve ammonium chloride crystals in water (H\(_2\)O), the ammonium chloride compound decomposes into its component ions: NH\(_4 ^+\) and Cl\(^-\). The reaction of these ions with water gives an acidic solution.