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 411:
The oxidation of
Options:
A) 2-butanone
B) 2-butanal
C) butane
D) butanoic acid
E) 3-butanal
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The correct answer is A .
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Question 412:
MnO2(s) + xHCl(aq) → MnCl2(aq) + yH2O(l) + zCl2(g)
In theequation above, what are the values of x, y and z respectively
Options:
A) 2, 1, 2
B) 4, 1, 2
C) 4, 2, 1
D) 1, 2, 1
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The correct answer is C .
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Question 413: An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore cartion in M is
Options:
A) Zn ++
B) Ca++
C) Ai+++
D) Pb++
E) Cu++
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The correct answer is A .
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Question 414: Water is said to be 'hard' if it
Options:
A) easily forms ice
B) has to be warmed before sodium chloride dissolves in it
C) froms an insoluble scum with soap
D) contains nitrates
E) contains sodium ions
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The correct answer is C .
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Question 415:
What are the possible oxidation numbers of an element if its atomic number is 17?
Options:
A) -1 and 7
B) -1 and 6
C) -3 and 5
D) -2 and 6
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The correct answer is A .
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Question 416: To what temperature must a gas 273 K be heated in order to double both its volume and pressure?
Options:
A) 298 K
B) 546 K
C) 819 K
D) 1092 K
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The correct answer is D .
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Question 417: The oxidation state of oxygen in tetraoxosulphate (VI) acid is
Options:
A) -4
B) -2
C) +4
D) -8
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The correct answer is B .
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Question 418: Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?
Options:
A) Ca2+
B) Mg2+
C) Zn2+
D) Cu2+
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The correct answer is C .
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Question 419: The three-dimensional shape of methane is
Options:
A) hexagonal
B) trigonal
C) linear
D) tetrahedral
E) cubical
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The correct answer is D .
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Question 420: The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
Options:
A) nitrogen (ll) oxide
B) nitrogen (l) oxide
C) nitrogen (lV) oxide
D) nitrogen
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The correct answer is C .