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 591:
The set-up above would be useful for determining the amount of
Options:
A) oxygen in air
B) water vapour in air
C) CO2 in air
D) arygen in air
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The correct answer is B .
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Question 592: The enzymes responsible for converting sucrose into two simple isomeric sugars is
Options:
A) maltase
B) amylase
C) invertase
D) lactase
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The correct answer is C .
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Question 593: Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises?
Options:
A) The bonds in the reacting molecules are more readily broken
B) The molecular collisions become more violent
C) A lower proportion of the molecules has the necessary minimum energy to react
D) The collision frequency of the molecules increase
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The correct answer is D .
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Question 594: 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 595:
Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]
Options:
A) 16
B) 48
C) 40
D) 12
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The correct answer is B .
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Question 596: Which of the following statement is correct about the periodic table?
Options:
A) Elements in the same period have the same number of valency electron
B) The valence electron of the elements in the same period increase progressively across the period
C) Elements in the same group have the same number of electron shells
D) The non-metallic properties of the elements tend to decrease across each period
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The correct answer is B .
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Question 597: The electronic configuration of Mg 2+ is
Options:
A) ls 22s 22P 63s23P2
B) Is22s22P6
C) ls22s22p63s2
D) ls22s22P4
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The correct answer is B .
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Question 598: Tetraoxosulphate (IV) ions are finally tested using?
Options:
A) acidified silver nitrate
B) acidified barium chloride
C) ime-water
D) dilute hydrochloric acid
E) acidified lead nitrate
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The correct answer is B .
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Question 599: Elements in the same period in the periodic table have the same
Options:
A) number of shells
B) atomic number
C) chemical properties
D) physical properties
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The correct answer is A .
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Question 600: Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?
Options:
A) the electrons in both 2s and 2p orbitals have equal energy
B) the electrons in both 2s and 2p orbitals are equivalent
C) both the 2s and 2p orbitals hybridizes
D) the six orbitals hybridize to four
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The correct answer is C .