2019 - JAMB Chemistry Past Questions and Answers - page 3
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
When ammonia and hydrogen ion go into bonding, they form ammonium ion by combining with a dative/coordinate covalent bond.
Which of the following represents the kind of bonding present in ammonium chloride?
Consider the reaction
A\(_{(s)}\) + 2B\(_{(g)}\) → 2C\(_{(aq)}\) + D\(_{(g)}\)
What will be the effect of a decrease in pressure on the reaction?
Given: The equation below
A\(_{(s)}\) + 2B\(_{(g)}\) → 2C\(_{(aq)}\) + D\(_{(g)}\)
Since we have a higher number of moles of gaseous species on the LHS, i.e 2, a decrease in pressure will favor the forward reaction.
For the general equation of the nature
xP + yQ ⇌ mR + nS, the expression for the equilibrium constant is
Given:
xP + yQ ⇌ mR + nS
Let us assume they are all in aqueous solution
k = \(\frac{[R]^m[S]^n}{[P]^x[Q]^y}\)
Which of the following reactions is an oxidation process?
If acidified Potassium Dichromate(VI) (K\(_2\)Cr\(_2\)O\(_7\)) acts as oxidizing agent, color changes from
Potassium dichromate is an oxidising agent in organic chemistry. It is used to oxidize alcohols.
In an aqueous solution the color change exhibited can be used to test for distinguishing aldehydes from ketones. Aldehydes reduce dichromate from the +6 to the +3 oxidation state, changing color from orange to green. This color change arises because the aldehyde can be oxidized to the corresponding carboxylic acid.
The heat of formation of ethene, C\(_2\)H\(_4\) is 50 kJmol\(^{-1}\), and that of ethane, C\(_2\)H\(_6\) is -82kJmol\(^{-1}\). Calculate the heat evolved in the process:
C\(_2\)H\(_4\) + H\(_2\) \(\to\) C\(_2\)H\(_6\)
Which of the following statements about catalyst is false?
Which of the following does not support the fact that air is a mixture?
What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?