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.
-262 kJ mol-1
-42 kJ mol-1
+42 kJ mol-1
+262 kJ mol-1
Correct answer is B
CO + H2O → CO2 + H2 DH = 394 kJ mol-1
-242 + 110 = -352 kJ mol-1
35 = -394 -(352)
= -394 + 352
= -42 kJ mol-1
Na+ and Cl-
Na+ and OH-
H+ and OH-
H+ and Cl-
Correct answer is D
In the electrolysis of conc. NaCl,
anions = \(Cl^- and OH^-\)
cations = \(H^+ and Na^+\)
So, hydrogen ion will migrate to the cathode, and Cl ion will migrate to the anode at the expense of hydroxide ion because of higher concentration in the solution
2SO3(g) ↔ 2SO2(g) + O2(g)
2CO2(g) ↔ 2CO(g) + O2(g)
2H2(g) + O2(g) ↔ 2H2O(g)
2NO(g) ↔ N2(g) + O2(g)
Correct answer is C
No explanation has been provided for this answer.
If y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?
Y increases in oxidation number
Y becomes reduced
Z loses protons
Z gains protons
Correct answer is B
No explanation has been provided for this answer.
Which of the following will change when a catalyst is added to a chemical reaction?
The activation energy
The potential energy of the reactants
The heat of the reaction
the potential energy of the product
Correct answer is A
No explanation has been provided for this answer.