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 121: The acid used in electrolysis of water is dilute
Options:
A) HNO3
B) CH3COOH
C) H2SO4
D) HCl
Show Answer
The correct answer is C .
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Question 122: Sieving is a technique used to separate mixtures containing solid particles of
Options:
A) small sizes
B) large sizes
C) different sizes
D) the same size
Show Answer
The correct answer is C .
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Question 123: The vulcanizer's solution is prepared by dissolving rubber in
Options:
A) ethanol
B) kerosine
C) benzene
D) petrol
Show Answer
The correct answer is C .
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Question 124:
The diagram above represents an atom of
Options:
A) magnesium
B) helium
C) chlorine
D) neon
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The correct answer is A .
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Question 125: 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
Show Answer
The correct answer is A .
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Question 126: The atom of an element X is represented as . The basic chemical properties of X depend on the value of
Options:
A) Y
B) Z
C) Y - Z
D) Z - Y
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The correct answer is B .
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Question 127: Copper sulphate solution is electolysed using platinum electrodes A. current of 0.193 amperes is passed for 2hrs. How many grams of copper are deposited? (cu = 63.5, F = 96500 coulombs)
Options:
A) 0.457g
B) 0.500g
C) 0.882g
D) 0.914g
E) 1.00g
Show Answer
The correct answer is A .
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Question 128:
The lUPAC name for
Options:
A) 1-methyl pentane
B) 3-methylbutane
C) 2-methylbutane
D) 1-dimethyl propane
Show Answer
The correct answer is C .
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Question 129: The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and
Options:
A) tricloromethane
B) dichloromethane
C) tetrachloromethane
D) chloromethane
Show Answer
The correct answer is C .
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Question 130: The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
Options:
A) Phosphorus-32
B) Cobalt-60
C) Carbon-14
D) Iodine-131
Show Answer
The correct answer is B .