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 321:
The hybridization in the compound is
Options:
A) sp and sp
B) sp
C) sp
D) sp and sp
Show Answer
The correct answer is A .
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Question 322: The density of a certain gas is 1.98gdm-3 at s.t.p. What is the molecular mas of the gas?
Options:
A) 44.0 g
B) 54.0 g
C) 26.0 g
D) 31.0 g
Show Answer
The correct answer is A .
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Question 323:
Which of the following conditions will most enhance the spontaneity of a reaction?
Options:
A) H is negative and greater than TS
B) H is negative and S = 0
C) H is positive and less than TS
D) H is positive and equal to TS
Show Answer
The correct answer is A .
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Question 324: A compound gives an orange-red colour to non-luminous flame. This compound is likely to contain
Options:
A) Na+
B) Ca2+
C) Fe3+
D) Fe2+
Show Answer
The correct answer is B .
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Question 325:
An element has an atomic number of 8 and a mass number of 16. How many neutrons does this element have?
Options:
A) 24
B) 16
C) 8
D) 32
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The correct answer is C .
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Question 326:
The enzyme that converts glucose to ethylalcohol is?
Options:
A) maltase
B) zymase
C) Diatase
D) Invertase
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The correct answer is B .
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Question 327: Incomplete oxidation of ethanol yields
Options:
A) CH3COOH
B) CH3COCH3
C) CH3CH2OCH2CH3
D) CH2CHO
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The correct answer is D .
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Question 328:
What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution?
[Na = 23, Cl = 35.5]
Options:
A) 116 g
B) 175 g
C) 87 g
D) 58 g
Show Answer
The correct answer is B .
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Question 329: The flame used by welders in cutting metals is
Options:
A) butane gas flame
B) acetylene flame
C) kerosene flame
D) oxy-acetylene flame
E) oxygen flame
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The correct answer is D .
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Question 330: Which of the reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?
Options:
A) OH- - e → OH
B) CIsup>- - e → CI
C) OHsup>- + CIsup>-HCI + O2
D) Na+ - esup>- Hg (Na)/(Hg) amalgam
Show Answer
The correct answer is A .