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 1:
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 2:
Which trace gas in the atmosphere plays a significant role in the greenhouse effect?
Options:
A) Oxygen
B) Argon
C) Carbon dioxide
D) Nitrogen
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The correct answer is C .
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Question 3: Which of the following is used as fuel in miners' lamp?
Options:
A) Ethanal
B) Ethyne
C) Ethene
D) Ethane
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The correct answer is B .
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Question 4: How many structural isomers of chlorobutane are possible?
Options:
A) 4
B) 3
C) 2
D) 1
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The correct answer is A .
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Question 5:
The periodic classification is an arrangement of the elements
Options:
A) atomic weights
B) isotopic weights
C) molecular weights
D) atomic numbers
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The correct answer is D .
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Question 6: When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is
Options:
A) ethyne
B) diethyl sulphate
C) diethyl ether
D) acetone
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The correct answer is C .
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Question 7: When sodium reacts with water, the resulting solution is
Options:
A) Weakly acidic
B) Neutral
C) Acidic
D) Alkaline
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The correct answer is D .
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Question 8: Pure solvents are obtained by
Options:
A) distillation
B) condensation
C) extraction
D) evaporation
E) desolution
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The correct answer is A .
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Question 9: The hybridization of the carbon atom in ethyne is
Options:
A) sp 4
B) sp 3
C) sp2
D) sp
E) s
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The correct answer is D .
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Question 10:
The emission of two successive beta particles from the nucleus will produce
Options:
A) Si
B) Al
C) Cl
D) S
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The correct answer is C .