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 81: Which of the following dilute solutions has the lowest pH value?
Options:
A) Calcium trioxocarbonate (IV)
B) Sodium trioxocarbonate (IV)
C) Hydrochloric acid
D) Ethanoic acid
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The correct answer is C .
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Question 82: It is difficult to achieve an orderly arrangement of the molecules of a gas because they
Options:
A) have no definite shape
B) have little force of attraction between them
C) can collide with one another in the container
D) are too small in size
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The correct answer is B .
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Question 83: Which of the following processes NOT lead to a chemical change?
Options:
A) Strirring iron in sulphur (IV) acid
B) Stirring sodium carbonate in water
C) Stirring glucose in concentrated sulphur (IV) acid
D) Mixing sulphur (IV) acid with potassium carbonate
E) Titrating an acid against base
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The correct answer is B .
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Question 84: Synthetic rubber is made by polymerization of?
Options:
A) 2 methyl buta - 1, 3 - diene
B) 2 methyl buta - 1, 2 - diene
C) 2 methyl but -1-ene
D) 2 methyl but-2-ene
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The correct answer is A .
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Question 85: The general formula of an alkyl halide (where X represents the halide) is?
Options:
A) CnH2n2X
B) CnH2n + 1X
C) CnH2n + 2X
D) CnH2nX
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The correct answer is B .
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Question 86:
Which of the following properties increases from left to right along the period but decreases down the group in the Periodic Table?
I. Atomic Number ii. Ionization energy iii. Metallic character iv. Electron affinity
Options:
A) ii and iii only
B) ii and iv only
C) iii and iv only
D) i and ii only
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The correct answer is B .
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Question 87: What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/
Options:
A) The blue colour of the solution disappears
B) Electrons flow from copper to zinc
C) The zinc rod remain undissolved
D) The copper generate more copper ions
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The correct answer is A .
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Question 88:
The sulphide that is commonly used in coating electric fluorescent tubes is?
Options:
A) iron(ii)Sulphide
B) tin(ii)sulphide
C) Zinc Sulphide
D) lead(iv) Sulphide
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The correct answer is C .
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Question 89: A metal X forms two bromides with the formulae XBr2 and XBr3. What type of bonding exists between X and bromine in the bromide?
Options:
A) Ionic bonding
B) Metallic bonding
C) Dative bonding
D) Covalent bonding
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The correct answer is A .
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Question 90: Which of the following is a neutralization reaction? Addition of
Options:
A) nitric acid to hydrochloric acid
B) nitric acid to sulphuric acid
C) nitric acid to distilled water
D) nitric acid to sodium hydroxide
E) sodium chloride to distilled water
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The correct answer is D .