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.
[NO2][N2]+[O2]
[2NO]2[N2][O2]
[N2]+[O2]2[NO]2
[NO]2[N2][O2]
Correct answer is D
No explanation has been provided for this answer.
What will happen if more heat is applied to the following system at equilibrium?
X2(g) + 3Y2(g) ⇌ 2XY3(g); ∆H = xKJmol−1
the yield of XY 3 will decompose
more of XY3 will decompose
More of X2 will react
the forward reaction will remain static
Correct answer is C
Increase in temperature will cause the forward reaction to occur, increasing the amounts of the products and decreasing the amounts of reactants.
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution. [NaOH = 40 g mol-1]
0.0156 g
0.625 g
1.00 g
25.0 g
Correct answer is D
1 mole of NaOH per dm3 has a mass of 40g.
mass of NaOH in 0.125mole
= 0.125 x 40 = 5g.
mass in 5.00 dm3 of the solution.
= 5 x 5 = 25.0g.
A substance is said to be hygroscopic if it absorbs
water from the atmosphere to form a solution
heat from the surrounding
carbon (IV) oxide from the atmosphere
moisture from the atmosphere without dissolving
Correct answer is D
No explanation has been provided for this answer.
Which of following acids forms normal salts only?
Tetraoxosulphate (VI) acid
Trioxosulphate (IV) acid
Acetic acid
Tetraoxophosphate (V) acid
Correct answer is C
So we can determine that the basicity of Acetic acid is 1 because it releases one hydrogen ion in an aqueous solution.
Due to this they act as very weak acids. When weak acid reacts with strong base, they tend to form normal salt.