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 331: → + alpha particle
Options:
A) 226
B) 220
C) 227
D) 222
Show Answer
The correct answer is D .
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Question 332: The atom of an element X is represented as zyX. The basic chemical properties of X depends on the value of
Options:
A) Y
B) Z
C) Y - Z
D) Z - Y
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The correct answer is B .
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Question 333: 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 334: A noble gas with a high power of fog penetration used in aerodrome beacons is
Options:
A) krpton
B) argon
C) helium
D) neon
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The correct answer is D .
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Question 335: 25 cm3 of 0.02 M KOH neutralized 0.03 g of a monobasic organic acid having the general formula CnH2n + 1 COOH. The molecular formula of the acid is?(C = 12, H = 1, O = 16)
Options:
A) HCOOH
B) C2H5COOH
C) CH3COOH
D) C3H7COOH
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The correct answer is C .
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Question 336: The process that requires the use of hardwater in its operation is
Options:
A) Tanning
B) Bottling
C) Laundry
D) Dyeing
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The correct answer is B .
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Question 337: 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 338: An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.
Options:
A) polymerism
B) isotopy
C) isomorphism
D) isomerism
E) allotrophy
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The correct answer is E .
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Question 339: Carbon (II) oxide is considered dangerous if inhaled mainly because it
Options:
A) can cause injury to the nervous system
B) competes with oxygen in the blood
C) competes with carbon (IV) oxide in the blood
D) can cause lung cancer
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The correct answer is B .
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Question 340: The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is
Options:
A) dissolution → dryness → filtration → evaporation
B) filtration → sublimation → evaporation → dryness
C) sublimation → dissolution → filtration → evaporation
D) dissolution → filtration → sublimation → evaporation
Show Answer
The correct answer is C .