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 751: A chemical reaction which the hydration energy is greater than the lattice energy is referred to as
Options:
A) a spontaneous reaction
B) an endothermic reaction
C) an exothermic reaction
D) a reversible reaction
Show Answer
The correct answer is C .
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Question 752: If the cost of electricity required to deposit 1 g of magnesium is ₦5.00, how much would it cost to deposit 10g of aluminium?
Options:
A) ₦10.00
B) ₦27.00
C) ₦44.44
D) ₦66.67
E) ₦33.33
Show Answer
The correct answer is D .
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Question 753: The soft solder used for welding and plumbing is alloy of
Options:
A) lead and tin
B) iron and tin
C) lead and zinc
D) iron and zinc
Show Answer
The correct answer is A .
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Question 754: One of the products of the thermal decomposition of sodium trioxonitrate (V) is
Options:
A) sodium
B) nitrogen
C) sodium dioxonitrate (III)
D) sodium oxide
Show Answer
The correct answer is C .
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Question 755: The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
Options:
A) excess Mg ribbon
B) excess cold water
C) very hot water
D) steam
Show Answer
The correct answer is D .
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Question 756:
Which of the following does not support the fact that air is a mixture?
Options:
A) the constituents of air are in a fixed proportion by mass
B) it cannot be represented with a chemical formula
C) the constituents of air can be separated by physical by physical means
D) none of the above
Show Answer
The correct answer is A .
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Question 757: The oxidation number of iodine in KIO3 is
Options:
A) +7
B) +3
C) +5
D) +6
Show Answer
The correct answer is C .
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Question 758:
The IUPAC nomenclature of the compound
HC - CH(CH) - CH(CH) - CH - CH
Options:
A) 3,4- dimethylhexane
B) 2,3- dimethyl pentane
C) 2- ethyl hexane
D) 2,3- dimethylhexane
Show Answer
The correct answer is B .
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Question 759: The IUPAC nomenclature of compound CH3CH2COOCH2CH3 is
Options:
A) propyl ethanoate
B) ethyl butanoate
C) ethyl propanoate
D) methyl butanoate
Show Answer
The correct answer is C .
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Question 760:
If the cost of electricity required to discharge 10g of an ion X is N20.00, how much would it cost to discharge 6g of ion Y?
[1 faraday = 96,500C, atomic masses are X = 27, Y = 24]
Options:
A) N10.00
B) N6.00
C) N20.00
D) N9.00
Show Answer
The correct answer is D .