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 181: Which of the following compounds is used as a gaseous fuel?
Options:
A) CH3 -CH2 -CHO2 -COOH
B) CH3 -C = CH
C) CH3 -CH2 -CH2 -CH3
D) CH2 -CH2 -CH3
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The correct answer is C .
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Question 182: Consecutive members of an alkane homologous serires differ by
Options:
A) CH
B) CH2
C) CH3
D) CnHn
E) CnH
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The correct answer is B .
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Question 183:
CO(g) + H2O(g) → CO2(g) + H2(g)
From the reaction above, calculate the standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol-1 are -394, -242, and -110 respectively.
Options:
A) -262 kJ mol-1
B) -42 kJ mol-1
C) +42 kJ mol-1
D) +262 kJ mol-1
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The correct answer is B .
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Question 184:
The volume of 2.5 moles of oxygen at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm3]
Options:
A) 50.0 dm3
B) 84.0 dm3
C) 28.0 dm3
D) 56.0 dm3
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The correct answer is D .
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Question 185:
The alkanoic acid found in human sweat is
Options:
A) CH-COOH
B) CH—CH—COOH
C) H-COOH
D) CH
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The correct answer is B .
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Question 186:
At 27°C, 58.5g of sodium chloride is present in 250cm of a solution. The solubility of sodium chloride at this temperature is?
(molar mass of sodium chloride = 111.0gmol)
Options:
A) 2.0 moldm
B) 0.25 moldm
C) 1.0 moldm
D) 0.5 moldm
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The correct answer is A .
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Question 187: The arrangement of particles in crystal lattices can be studied using
Options:
A) X-rays
B) -rays
C) -rays
D) -rays
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The correct answer is A .
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Question 188:
Stainless steel is an alloy made up of
Options:
A) Iron and zinc
B) Copper and tin
C) Iron and chromium
D) Iron and carbon
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The correct answer is C .
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Question 189:
The mass number of a nucleus is?
Options:
A) Always less than its atomic number
B) The sum of the number of protons and neutrons present in the nucleus
C) Always more than the atomic weight
D) A fraction
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The correct answer is B .
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Question 190: The radio active radiation used in studying the arrangement of particles in giant organic molecules is
Options:
A) - rays
B) - particles
C) X-rays
D) - particles
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The correct answer is C .