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.
In the experiment above, X could be a solution of
sodium trioxonitrate (V) and ammonium chloride
sodium trioxonitrate (lll) and ammonium chloride
lead (ll) trioxonitrate (V) and copper turnings
potassium trioxonitrate (V) and copper turnings
Correct answer is B
Nitrogen is prepared in the laboratory by heating an equimolar aqueous solution of ammonium chloride and sodium nitrite. The ammonium nitrite formed as a result of a double decomposition reaction, decomposes to form nitrogen gas.
\(NH_4Cl_{(aq)}+NaNO_{2(aq)} → NH_4NO_{2(aq)}+NaCl_{(aq)}\)
\(NH_4NO_{2(aq)} →N_{2(g)} +2H_2O_{(l)}\).
(source: understanding chemistry by G O Ojukuku)
In the diagram above , the activation energy for the backward reaction is
+5kJ
+15KJ
+25KJ
+30KJ
Correct answer is C
For the backward reaction, the activation energy = 40kJ - 15kJ = +25kJ
The diagram above represents an atom that can combine with chlorine to form
a covalent bond
an electrovalent bond
a hydrogen bond
a co-ordinate bond
Correct answer is B
No explanation has been provided for this answer.
The compound above is the product of the oxidation of
2-methlbutan-2-ol
2-methylbutan -1- ol
2, 3-dimethylprop 1-ol
Pentan -2- ol
Correct answer is B
No explanation has been provided for this answer.
Sp 3 hybridized carbon atoms only
Sp 2 hybridized carbon atoms only
Sp 3 and Sp hybirdized carbon atoms
Sp 3 and Sp 2
Correct answer is D
No explanation has been provided for this answer.