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.
Fats and oils can be obtained from any of the following sources except
paraffin oil
animals
groundnuts
palm kernel
Correct answer is A
Paraffin oil is gotten from petroleum distillation and can't be a source of fats and oil.
Which of the following pairs of gases are pollutants from car exhaust?
Nitrogen(II) oxide and Carbon(IV) oxide
Carbon(IV) oxide and Nitrogen
Carbon(II) oxide and Sulphur(IV) oxide
Carbon(II) oxide and oxygen
Correct answer is C
No explanation has been provided for this answer.
The name of the compound C4H9COOC3H7 is
propyl pentanoate
pentyl propanoate
butyl propanoate
propyl butanoate
Correct answer is A
The alkyl group is attached to the parent chain being a carboxylic acid. The name of the compound is gotten by writing the name of the attached alkyl group first and then the parent carboxylic acid is written but you change the -oic acid to -oate.
The alkyl group in this case is C3H7
The parent carboxylic acid is C4H9COOH which is pentanoic acid.
Hence, the name is propyl pentanoate.
Classification of alkanols is based on the
number of carbon atoms present in the compound
molecular mass of the compound
molecular formula of the compound
number of alkyl groups bonded to the carbon having the hydroxyl group
Correct answer is D
Alkanols can be classified as primary, secondary or tertiary, according to the number of alkyl groups attached to the carbon which bears the -OH group.
6.40g
0.67g
0.64g
0.45g
Correct answer is B
Cu2++2e−→Cu(s)
2×96500C=193000Cdeposits64gofCu
M∝It
Q=It=0.45A×1hr15mins
= 0.45×75×60 [converting the time to seconds]
Quantity of electricity passed = 2025C
193000C→64gCu
1C→64193000
2025C→64193000×2025
=0.6715g≊