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.
Ripening of fruits is hastened by using
Ethanol
Ethane
Ethene
Ethyne
Correct answer is C
No explanation has been provided for this answer.
Alkane
Alkanol
Alkanoate
Alkyne
Correct answer is B
No explanation has been provided for this answer.
Amino acids are obtained from proteins by
Hydrolysis
Oxidation
Polymerization
Reduction
Correct answer is A
No explanation has been provided for this answer.
Al(s) + Cu2+(aq) \(\to\) Al3+(aq) + Cu(s)
2Al(s) + Cu2+(aq) \(\to\) 2Al(aq) + Cu(s)
2Al(s) + 3Cu2+(aq) \(\to\) 3Cu(s) + 2Al3+(aq)
3Al(s) + 2Cu2+(aq) \(\to\) Cu(s) + 3Al3+(aq)
Correct answer is C
Al(s) \(\to\) Al3+(aq) + 3e- ______(i)
Cu2+(aq) + 2e- \(\to\) Cu(s) ________(ii)
To balance the electrons, multiply equation (i) by 2 and equation (ii) by 3 and then add the resulting equations
2Al(s) \(\to\)2Al3+(aq) + 3e-
3cu2+(aq) + 6e- \(\to\)3Cu(s)
2Al(s) + 3Cu2+(aq) \(\to\) 3Cu(s) + 2Al3+(aq)
7
6
3
2
Correct answer is B
No explanation has been provided for this answer.