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 551: Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol-1]
Options:
A) 0.05
B) 10.80
C) 10.00
D) 0.10
Show Answer
The correct answer is D .
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Question 552: Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?
Options:
A) acid
B) ester of allanoic acid
C) alkali
D) alkanol
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The correct answer is C .
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Question 553: Which of the following reaction is endothermic?
Options:
A) C(s) + O2(g) → CO2(g)
B) CaO(s) + H2O(l) → Ca(OH)2(s)
C) C(s) + H2O(g) → CO(g) + H2(g)
D) HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
Show Answer
The correct answer is C .
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Question 554: Sodium hydroxide solution can be conveniently stored in a container made of?
Options:
A) lead
B) zinc
C) aluminium
D) copper
Show Answer
The correct answer is D .
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Question 555: Which of the following compounds reacts with sodium metal as well as silver and copper salts ?
Options:
A) CH3C Ξ C—CH3
B) CH3CH2CH23>
C) CH3C Ξ CH
D) CH3CH = CH CH3
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The correct answer is C .
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Question 556: The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as?
Options:
A) deliquescene
B) hygroscopy
C) effervescence
D) efflorescence
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The correct answer is D .
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Question 557: The filter in the cigarette reduce the nicotine construct by
Options:
A) burning
B) absorption
C) evaporation
D) absorption
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The correct answer is A .
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Question 558: A small quantity of solid ammonium chloride (NH4Cl) texted gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo
Options:
A) distillation
B) sublimation
C) precipitation
D) evaporation
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The correct answer is B .
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Question 559: 5 block elements of the periodic table one made up of
Options:
A) groups 1, 2, 3
B) groups 1, and 2
C) group 3
D) group 3 to 7
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The correct answer is B .
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Question 560:
Two equal bulbs, one containing ammonia and the other nitrogen are opened mouth-to-mouth to each other at room temperature. The entropy in the mixture of gases is likely to
Options:
A) remain unchanged
B) increase
C) decrease
D) change
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The correct answer is B .