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 561: The function of zinc electrode in a galvanic cells is that it
Options:
A) undergoes reduction
B) serves as the positive electrode
C) production electons
D) uses up electrons
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The correct answer is C .
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Question 562: 30 cm3 of 0.1 M Al (NO3)3 SOLUTION IS RECTED WITH 100cm3 of 0.15M of NaOH solution. Which reactant is in excess, and by now much ?
Options:
A) NaOH solution by 70 cm3
B) NaOH solution, by 60 cm3
C) NaOH solution by 40 cm3
D) Al(NO3)3 solution by 20 cm3
E) Al(NO3)3 solution by 10 cm3
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The correct answer is C .
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Question 563:
Use the above options to the question. The products formed on hydrolysis of
Options:
A) A
B) B
C) C
D) D
E) E
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The correct answer is C .
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Question 564:
22688Ra → x86Rn + α - particle
What is the value of x in the nuclear reaction above?
Options:
A) 220
B) 222
C) 226
D) 227
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The correct answer is B .
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Question 565:
Wrought iron is obtained by heating cast iron in a furnace with?
Options:
A) magnetite
B) haematite
C) carbon(ii)oxide
D) calcium trioxosilicate(iv)
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The correct answer is B .
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Question 566:
What is the maximum number of electrons that can occupy the second energy level (n=2)?
Options:
A) 2 electrons
B) 18 electrons
C) 8 electrons
D) 32 electrons
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The correct answer is C .
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Question 567: Which of the following is used to hasten the ripening of fruit?
Options:
A) Ethene
B) Ethanol
C) Ethyne
D) Ethane
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The correct answer is A .
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Question 568:
When the end alkyl groups of ethyl ethanoate are interchanged, the compound formed is
Options:
A) propylmethanoate
B) ethylpropanoate
C) methyl ethanoate
D) methyl propanoate
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The correct answer is B .
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Question 569: A compound gives an orange-red colour to non-luminous flame. This compound is likely to contain
Options:
A) Na+
B) Ca2+
C) Fe3+
D) Fe2+
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The correct answer is B .
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Question 570: 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
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The correct answer is C .