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 641: 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 642: The oxidation state of carbon in HCOOH is
Options:
A) -1
B) +2
C) +3
D) zero
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The correct answer is B .
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Question 643: The pollution from petroleum spillage in rivers and lakes can best be dispersed by
Options:
A) Pouring detergents
B) Passing of ships through the area
C) Pouring organic solvents
D) Evaporation
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The correct answer is A .
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Question 644: 2 - methyl propan -2- ol is an example of a
Options:
A) primary alkanol
B) secondary alkanol
C) tertiary alkanol
D) quartenary alkanol
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The correct answer is C .
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Question 645: Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?
Options:
A) Litmus paper
B) Phenolphthalein
C) Methyl orange
D) Universal indicator
E) None of these
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The correct answer is C .
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Question 646: Which of the following gases will rekindle a brightly glowing splint?
Options:
A) NO2
B) NO
C) N2O
D) CI2
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The correct answer is C .
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Question 647:
A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is?
[ M = 27, Cl = 35.5]
Options:
A) MCl
B) MCl
C) MCl
D) MCl
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The correct answer is C .
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Question 648:
Proteins in acid solution undergo?
Options:
A) Substitution
B) Fermentation
C) Hydrolysis
D) Polymerisation
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The correct answer is C .
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Question 649:
Use the diagram above to answer this question.
The reaction taking place in the flask above is known as
Options:
A) hydrolysis
B) double decomposition
C) dehydration
D) pyrolysis
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The correct answer is C .
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Question 650: Ethanoic acid is
Options:
A) tribasic
B) unionizeable
C) monobasic
D) dibasic
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The correct answer is C .