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 511: Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of
Options:
A) crystallization
B) hydrolysis
C) chromatography
D) sublimation
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The correct answer is C .
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Question 512:
At room temperature and standard pressure, chlorine gas is in which state of matter?
Options:
A) Plasma
B) Solid
C) Liquid
D) Gas
Show Answer
The correct answer is D .
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Question 513: The gas that gives brown colouration in brown ring test is
Options:
A) NO
B) CO2
C) NO2
D) CO
Show Answer
The correct answer is A .
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Question 514: A hydrogen atom which has lost an electron contains
Options:
A) one proton only
B) one neutron only
C) one proton and one neutron
D) one proton, one electronic and one neutron
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The correct answer is A .
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Question 515: Which of the following is used to hasten the ripening of fruit?
Options:
A) Ethene
B) Ethanol
C) Ethyne
D) Ethane
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The correct answer is A .
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Question 516: Which of the following compounds is used as a gaseous fuel?
Options:
A) CH3 -CH2 -CHO2 -COOH
B) CH3 -C = CH
C) CH3 -CH2 -CH2 -CH3
D) CH2 -CH2 -CH3
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The correct answer is C .
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Question 517: An acid is said to be weak if?
Options:
A) its ions are so completely dissociated that they easily drift apart
B) the acid is not corrosive
C) the acid has low specific gravity
D) its ions move very slowly when in solution
E) its ions are incompletely dissociated
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The correct answer is E .
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Question 518: On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO4. yH2O. The value of y is?(Mg = 24, S = 32, O = 16, H = 1)
Options:
A) 1
B) 3
C) 5
D) 7
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The correct answer is D .
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Question 519: The main impurity in iron ore during the extraction of iron is
Options:
A) Silicon (IV) oxide
B) Carbon (IV) oxide
C) Calcium trioxosilicate
D) Sulphur (II) oxide
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The correct answer is A .
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Question 520: An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be
Options:
A) alkene
B) alkanal
C) alkanone
D) alkanoic acid
Show Answer
The correct answer is A .