Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 401: When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is
Options:
A) ethyne
B) diethyl sulphate
C) diethyl ether
D) acetone
Show Answer
The correct answer is C .
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Question 402: A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging?
Options:
A) Al and Mg
B) Zn and Fe
C) Zn and Pb
D) Pb and H
E) Au and Hg
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The correct answer is A .
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Question 403: Detergents are manufacture with strength hydrocarbon chains is to make them
Options:
A) soluble
B) biodegradable
C) cheaper
D) foamy
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The correct answer is B .
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Question 404: What properties of duralumin make it more useful than its constituent metals?
Options:
A) It is heavy with a high melting point
B) It is malleable and has high density
C) It is strong and light
D) It is hard and ductile
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The correct answer is C .
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Question 405: Water can be identified by the use of?
Options:
A) anhydrous copper (II) tetraoxosulphate (VI)
B) anhydrous sodium trioxocarbonate (IV)
C) potassium heptaoxochromate (VII)
D) copper (II) trioxocaronate (IV)
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The correct answer is A .
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Question 406:
Use the diagram above to answer this question. The activation energy of the uncatalysed reaction is
Options:
A) X
B) X + Y
C) X - Y
D) Y
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The correct answer is A .
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Question 407:
Which of the following compounds will form a solution if exposed to air?
Options:
A) Na2CO3.10H2O
B) NaNO3
C) CuSO4
D) CaCl2
E) NaSO4.10H2O
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The correct answer is D .
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Question 408: The type of bonding in {Cu(NH3)4}2+ is
Options:
A) coordinate
B) electrovalent
C) metallic
D) covalent
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The correct answer is A .
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Question 409: When the two end alkyl groups ethyl ethanoate are interchange, the compound formed is known as
Options:
A) methyl ethanoate
B) ethyl propanaote
C) methyl propanoate
D) propyl ethanoate
Show Answer
The correct answer is C .
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Question 410: When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
Options:
A) ionic bond
B) electrovalent bond
C) covalent bond
D) co-ordinate bond
E) hydrogen bond
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The correct answer is D .