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 371:
Chromatography is used to separate components of mixture which differ in their rates of ?
Options:
A) diffusion
B) migration
C) reaction
D) sedimentation
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The correct answer is B .
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Question 372:
CH3-CH-CH3
CH2CI Is known as?
Options:
A) 1-chloro-2-methylbutane
B) 1-chloro-2-methylpropane
C) 2-chloromethylpropane
D) 1-chloro-2, 2-dimethylethane
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The correct answer is B .
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Question 373: Sodium chloride has no solubility product value because of its?
Options:
A) saline nature
B) high solubility
C) low solubility
D) insolubility
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The correct answer is B .
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Question 374:
3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(I) N2(g) (i).
2NH3(g) + 3Cl2(g) → 6HCl(g) + N2(g) (ii).
4NH3(g) + 3O2(g) → 6H2O(I) + 2N2(g) (iii).
The reactions represented by the equations above demonstrate the?
Options:
A) basic properties of ammonia
B) acidic properties of ammonia
C) reducing properties of ammonia
D) oxidizing properties of ammonia
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The correct answer is C .
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Question 375:
NaCI(s) + H2SO4(I) → HCI(g) + NaHSO4(s).
In the reaction above, H2SO4 behaves as?
Options:
A) a strong acid
B) an oxidizing agent
C) a good solvent
D) a dehydrating agent
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The correct answer is A .
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Question 376: One mole of a hydrocarbon contains 36g of carbon and its vapour density is 20. The structure of the hydrocarbon is
Options:
A) CH3C ≡ CH
B) CH3CH = CH2
C) CH3CH2C ≡ CH
D) CH3CH2 CH3
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The correct answer is A .
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Question 377: Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?
Options:
A) Heating ammonia gas with tetraoxosulphate (VI) acid
B) Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
C) Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
D) Heating potassium trioxonitrate (V) with calcium hydroxide
E) Heating a mixture of ammonia gas and oxygen.
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The correct answer is C .
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Question 378: When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is
Options:
A) diethyl ether
B) ethyne
C) diethyl sulphate
D) acetone
E) ethanoic acid
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The correct answer is A .
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Question 379: Iron can be protected from corrosion by coating the surface with
Options:
A) gold
B) silver
C) copper
D) zinc
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The correct answer is D .
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Question 380: A compound that gives a brick-red colour to a non-luminous flame is likely to contain
Options:
A) copper ions
B) sodium ions
C) calcium ions
D) aluminium ions
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The correct answer is C .