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 91:
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Compound W is
Options:
A) a soap
B) an oil
C) an alkane
D) an ester
E) sucrose
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The correct answer is D .
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Question 92: The monomer of nylon is
Options:
A) Hydroxybenzene
B) Hexanedioic acid
C) Benzene -1,-4-dicarboxylic acid
D) Ethane-1,2-diol
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The correct answer is B .
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Question 93: The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
Options:
A) nitrogen (ll) oxide
B) nitrogen (l) oxide
C) nitrogen (lV) oxide
D) nitrogen
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The correct answer is C .
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Question 94: What is the volume of energy required to burn 45cm3 of mixture at S.T.P
Options:
A) 135.0cm3
B) 150.0cm3
C) 45.0cm3
D) 90.0cm3
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The correct answer is D .
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Question 95:
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 96: Vulcanization involve the removal of
Options:
A) monometer
B) the single bond
C) the double bond
D) a polymer
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The correct answer is C .
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Question 97: If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is
Options:
A) metallic
B) covalent
C) co-ordinate
D) ionic
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The correct answer is D .
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Question 98:
What is the principal ore of iron, from which iron is extracted?
Options:
A) Calcite
B) Bauxite
C) Magnetite
D) Hematite
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The correct answer is D .
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Question 99: Which of the following compounds is NOT an isomers of 2,2 dimethylbutane?
Options:
A) 2-methylbutane
B) 3-methylpentane
C) 2,3-dimethylbutane
D) 2-methylpentane
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The correct answer is A .
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Question 100: Substance employed as drying agents are usually
Options:
A) amphoteric
B) hydroscopic
C) efflorescent
D) acidic
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The correct answer is B .