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 651: The major and most effective way of controlling pollution is to
Options:
A) improve machinery so that the substances released from combustion are less harmful
B) pass strict laws against it by individuals and companies
C) educate people on the causes and effects of pollution
D) convert chemical wastes to harmless substances before releasing them into the environment
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The correct answer is C .
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Question 652: The confirmatory test for alkanoic acids in organic qualitative analysis is the?
Options:
A) turning of wet blue litmus paper red
B) reaction with alkanols to form esters
C) reaction with sodium hydroxide to form salt and water
D) reaction with aqueous Na2COsp3 to liberate a gas which turns lime water milky
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The correct answer is B .
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Question 653: The boiling point of water, ethanol, toluene and butan-2-ol are 373.0k, 351.3k, 383.6k and 372.5k respectively. Which liquid has the highest vapour pressure at 323.0k?
Options:
A) water
B) toluene
C) ethanol
D) butan-2-ol
E) none
Show Answer
The correct answer is C .
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Question 654: A liquid that will dissolve fat is
Options:
A) hydrochloric acid
B) calcium hydrochloride
C) kerosene
D) water
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The correct answer is C .
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Question 655:
What is the sum of the oxidation numbers in a neutral compound?
Options:
A) +2
B) -1
C) 0
D) +1
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The correct answer is C .
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Question 656:
Why is water often referred to as the "universal solvent"?
Options:
A) Water is the most abundant substance on Earth
B) Water is essential for all living organisms.
C) Water is involved in many chemical reactions
D) Water can dissolve a wide variety of substances due to its polar nature
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The correct answer is D .
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Question 657: For a reaction in equilibrium, the species involved in the equilibrium constant expression are
Options:
A) gaseous and solid species
B) liquid and solid species
C) solid and dissolved species
D) gaseous and dissolved species
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The correct answer is D .
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Question 658: Calculate the amount in moles of a gas which occupies 10.5 dm3 at 6 atm and 30oC [R = 082 atm dm3 K-1 mol-1]
Options:
A) 2.536
B) 1.623
C) 4.736
D) 0.394
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The correct answer is A .
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Question 659:
The molar ratio of carbon to hydrogen of a volatile liquid compound is 1: 2. 0. 12 g of the liquid on evaporation at s.t.p. gave 32 cm3 of vapour. The molecular formula of the liquid is
[G.M.V =22.4 dm 3, C = 12, H = 1]
Options:
A) C 3 H 6
B) C 4H 8
C) C 5C 10
D) C 6H 12
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The correct answer is D .
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Question 660: In the process of silver-plating a metal M, the metal M is the?
Options:
A) anode and a driect current is used
B) cathode and an alternating current is used
C) anode and an alternating current is used
D) cathode and a direct current is used
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The correct answer is B .