Question 1
Fats and oils are:
- A.Acids
- B.Alcohols
- C.Alkenes
- D.Esters
Show the answer and explanation
Answer: D Esters
Why
Fats and oils are triglycerides, which are triesters formed from glycerol and three fatty acid molecules.
Exam papers
Grade 12 Chemistry entrance exam, 2010 E.C. (2018)
Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2010 E.C. Every question comes with the correct answer and a worked explanation.
Natural science stream
Who sits it
2010 E.C. (2018)
Exam year
71 questions with answers
In this set
Try questions from this paper
Answer each question yourself before opening the answer. The explanations point to the exact place in the textbook, so you know which page to reread when you miss one.
Question 2
The reaction between alcohols and acyl chlorides produces
- A.Ethers
- B.Esters
- C.Carboxylic acids
- D.Aromatic salts
Show the answer and explanation
Answer: B Esters
Why
The reaction of an alcohol with an acyl chloride (acid chloride) undergoes nucleophilic acyl substitution to produce an ester and hydrogen chloride.
Question 4
When a student draws a plausible Lewis structure for hydrazine molecule (), how many lone pair of electrons are available?
- A.1
- B.4
- C.3
- D.2
Show the answer and explanation
Answer: D 2
Why
In hydrazine (H2N-NH2), each nitrogen atom forms three single covalent bonds (two with hydrogen atoms and one with the other nitrogen) and retains one lone pair, giving a total of 2 lone pairs in the molecule.
Question 5
Who used the cathode Ray tube to discover the electron and determine its charge to mass ratio?
- A.Robert A. Millikan
- B.James Chadwick
- C.J.J Thomson
- D.Ernest Rutherford
Show the answer and explanation
Answer: C J.J Thomson
Why
J.J. Thomson discovered the electron in 1897 using cathode ray tubes and successfully measured its charge-to-mass ratio (e/m).
Question 6
Compounds that contain the carboxyl (carbonyl and hydroxyl) group are said to be:
- A.Organic acids
- B.Ketones
- C.Aldehydes
- D.Esters
Show the answer and explanation
Answer: A Organic acids
Why
The carboxyl functional group (-COOH) consists of a carbonyl group bonded to a hydroxyl group, which characterizes carboxylic acids (organic acids).
Question 7
The main ore of lead is called:
- A.Zinc blend
- B.Galena
- C.Cinnabar
- D.Chromite
Show the answer and explanation
Answer: B Galena
Why
Galena, which is lead(II) sulfide (PbS), is the primary and most important mineral ore of lead.
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Are these the real 2010 E.C. Chemistry entrance exam questions?
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