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 211: The formula CH2 for ethanoic acid is regarded as its
Options:
A) Molecular formula
B) General formula
C) Empirical formula
D) Structural formula
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The correct answer is C .
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Question 212: An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula
rn(C=12,H =1, O=16)
Options:
A) C 5H 12O
B) C 3H 8O
C) C 6H 13O 2
D) C 4H 9O
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The correct answer is B .
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Question 213: When steam is passed through red hot carbon, which of the following are produced?
Options:
A) Hydrogen oxygen and carbon (IV) oxide
B) Hydrogen and carbon (IV) oxide
C) Hydrogen and carbon (II) oxide
D) Hydrogen and trioxocarbonate (IV) acid
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The correct answer is C .
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Question 214:
Chromatography is used to separate components of mixture which differ in their rates of ?
Options:
A) diffusion
B) migration
C) reaction
D) sedimentation
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The correct answer is B .
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Question 215: When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be
Options:
A) Efflorescence
B) Deliquescence
C) Effervescence
D) Fluorescence
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The correct answer is A .
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Question 216:
Why is water often referred to as the "universal solvent"?
Options:
A) Water is the most abundant substance on Earth
B) Water is essential for all living organisms.
C) Water is involved in many chemical reactions
D) Water can dissolve a wide variety of substances due to its polar nature
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The correct answer is D .
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Question 217: 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 218: If a gas occupies a container of volume 146 cm3 at 18°C and 0.97`atm, its volume 146cm3 at s.t.p is?
Options:
A) 133
B) 146
C) 266
D) 292
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The correct answer is A .
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Question 219: The hydrocarbon used in the production of styrene is
Options:
A) ethyne
B) propyne
C) ethane
D) ethene
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The correct answer is D .
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Question 220: In which of the following reactions can the oxidation number of the nitrogen be said to have increased?
Options:
A) 2NO(g) + O2(g) → 2NO2(g)
B) NO(g) + Cl2(g) → NOCl2(l)
C) FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
D) NO(g) + Br2(l) → NOBr2(l)
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The correct answer is A .