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 601:
Potassium trioxochlorate (V)has a solubility of 1.5 mol dm -3 at 45 oC.On cooling this solution to a temperature of 20 oC, the solubility was found to be 0.5 mol dm -3. What mass of KCIO 3 was crystalized out?
[K = 39, Cl = 35.5 O =16].
Options:
A) 1.00g
B) 10.00g
C) 12.25g
D) 122.50g
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The correct answer is D .
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Question 602:
Crude petroleum is converted to useful products by the processof?
Options:
A) fractional crystallization
B) fractional distillation
C) filtration
D) chromatography
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The correct answer is B .
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Question 603: In general, an increase in temperature increases the solubility of a solute in water because?
Options:
A) more solute molecules collide with each other
B) most solutes dissolve with the evoltion of heat
C) more solute molecules dissociate at hihger temperatures
D) most solutes dissolve with absorption of heat
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The correct answer is C .
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Question 604: Neutralization involves a reaction between H3O+ and?
Options:
A) CI-
B) OH-
C) NO3-
D) CO32-
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The correct answer is B .
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Question 605: What volume of a 0.1 M H3PO4 will be required to neutralize 45.0 cm3 of a 0.2 M NaOH?
Options:
A) 10.0 cm3
B) 20.0 cm3
C) 27.0 cm3
D) 30.0 cm3
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The correct answer is D .
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Question 606: A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be
Options:
A) sulphur (VI) oxide
B) hydrogen chloride
C) sulphur (VI) oxide
D) hydrogen sulphide
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The correct answer is D .
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Question 607:
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
Options:
A) Sublimation
B) Crystallization
C) Distillation
D) Evaporation
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The correct answer is A .
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Question 608: The forces holding naphthalene crystals together can be overcome when naphthalene is heated to a temperature of 354K resulting in the crystal to melting. These forces are known as?
Options:
A) coulombic
B) ionic
C) covalent
D) Van der waals
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The correct answer is D .
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Question 609: If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?
Options:
A) 2.0
B) 1.8
C) 1.4
D) 1.0
E) 0.5
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The correct answer is C .
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Question 610:
What volume of oxygen will remain after reacting 8cm of hydrogen gas with 20cm of oxygen gas
Options:
A) 10cm
B) 12cm
C) 14cm
D) 16cm
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The correct answer is D .