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 11: Group VII elements are
Options:
A) monoatmic
B) good oxidizing agents
C) highly electropositive
D) electron donors
Show Answer
The correct answer is B .
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Question 12:
Consider the reaction: A + 2B 2C + D (H = +ve)
What will be the effect of decrease in temperature on the reaction?
Options:
A) Rate of backward reaction will increase
B) The equilibrium constant will shift
C) Rates of forward and backward reactions are not affected
D) Rate of forward reaction will increase
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The correct answer is A .
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Question 13:
With conc H2SO4 as catalyst
CH3COOH + C2H5OH → CH3COOC2H5 + H2O
Options:
A) esterification
B) Condensation
C) saponification
D) neutralization
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The correct answer is A .
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Question 14:
Which of the compounds is composed of Al, Si, O and H?
Options:
A) Epson salt
B) Limestone
C) Clay
D) Urea
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The correct answer is C .
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Question 15:
Which of the following describes the chemical property of acids?
Options:
A) None of the above
B) Acid + XCO Salt + HO + NH
C) Acid + NaOH Normal salt + CO
D) Acid + XCO Salt + HO + CO
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The correct answer is D .
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Question 16: Elements X and Y have electronic configurations 1s22s22p6 and 1s22s22p63s23p1 respectively. When they combine, the formula of the compound formed is
Options:
A) XY
B) YX
C) X2Y3
D) Y2X3
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The correct answer is D .
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Question 17:

The diagram shown above represents the solubility curves of two salts, X and Y, in water, use this diagram to answer the question. If the molar mass of X is 36 g, the number of moles of X dissolved at 343 K is
Options:
A) 0.2 moles
B) 0.7 moles
C) 1.5 moles
D) 2.0 moles
E) 3.0 moles
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The correct answer is B .
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Question 18: Addition of dilute hydrochloride acid to an aqueous solution of a crystalline salt yield a yellow precipitate and a gas which turned dichromate paper green. The crystalline salt was probably?
Options:
A) Na2SO4
B) Na2S
C) Na2S2O3.5H2O
D) Na2CO3
E) NaHCO3
Show Answer
The correct answer is C .
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Question 19: 10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What is the concentration of the final solution in mol dm-3?
Options:
A) 0.4
B) 8.0
C) 2.0
D) 0.5
Show Answer
The correct answer is A .
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Question 20:
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na=23, O=16, H=1]
Options:
A) 0.05 moldm-3
B) 0.30 moldm-3
C) 0.50 moldm-3
D) 0.40 moldm-3
Show Answer
The correct answer is C .