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.
2e-
3e-
5e-
7e-
Correct answer is C
We want the number of charges on both sides of the equation to be the same.
i.e. number of charges on the reactant side = the number of charges on the product side.
-1 + 8 = 2
7 = 2
difference in number of charges = 5, hence Y = 5.
The pOH of a solution of 0.25 mol dm-3 of hydrochloric acid is
12.40
13.40
14.40
14.60
Correct answer is B
pOH = -log [2.5 * 10-1]
= -log[-0.3979 + 1]
= 13.40
In which order are the following salts sensitive to light?
Agl > AgCl > AgBr
AgCl > Agl > AgBr
AgBr > AgCl > Agl
AgCl > AgBr > Agl
Correct answer is C
light sensitivities of the silver halides: AgBr > AgCl > AgI. Notably; AgBr is used in production of photographic chemicals.
HCL(aq) + H2O(l) H3O+(aq) + Cl-(aq)
In the reaction above, Cl-(aq) is the
conjugate acid
acid
conjugate base
base
Correct answer is C
No explanation has been provided for this answer.
Hydration of ions in solution is associated with
absorption of heat
reduction of heat
conduction of heat
liberation of heat
Correct answer is D
No explanation has been provided for this answer.