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 421: Alkanoates are formed by the reaction of alkanoic acid with?
Options:
A) Alkyl halides
B) alkanols
C) ethers
D) sodium
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The correct answer is B .
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Question 422:
The sulphide that is commonly used in coating electric fluorescent tubes is?
Options:
A) iron(ii)Sulphide
B) tin(ii)sulphide
C) Zinc Sulphide
D) lead(iv) Sulphide
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The correct answer is C .
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Question 423: When air is passed through alkaline pyrogallol and then over quicklime, the only gases left are?
Options:
A) nitrogen and carbondoxide
B) the rare gases
C) nitrogen and oxygen
D) nitrogen and the rare gases
E) nitrogen, carbonioxide and the rare gases
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The correct answer is D .
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Question 424:
Consider the reaction
A + 2B → 2C + D
What will be the effect of a decrease in pressure on the reaction?
Options:
A) the equilibrium will shift
B) rate of forward reaction will increase
C) rate of backward reaction will increase
D) rates of forward and backward reaction are not affected
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The correct answer is B .
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Question 425:
An organic compound with fishy smell is likely to have a general formula?
Options:
A) RCONHR
B) RCONH
C) RNH
D) RCOR
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The correct answer is C .
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Question 426:
2KClO3(g) MNO3→ 2KCl(s) + 3O2(g)
The importance of the catalyst in the reaction above is that
Options:
A) heating may not be required before the reaction takes place
B) the reaction is controllable even at a high temperature
C) the reaction produces large quantity of oxygen
D) the reaction takes place more rapidly at a lower temperature
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The correct answer is D .
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Question 427: What mass of a divalent metal M (atomic mass = 40) would react with excess hydrogen gas measured at S.T.P?
Options:
A) 8.0 g
B) 4.0 g
C) 0.8 g
D) 0.4 g
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The correct answer is D .
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Question 428:
Chlorine gas is commonly used in the production of which of the following industrial compounds?
Options:
A) Chlorofluorocarbons (CFCs)
B) Methane
C) Ammonia
D) Ethanol
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The correct answer is A .
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Question 429: In the electrolytic extraction of cacium from calcium chloride, the cathode is
Options:
A) zinc
B) graphite
C) platinum
D) iron
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The correct answer is D .
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Question 430: When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?
Options:
A) sodium nitrate
B) mercuric nitrate
C) lithium nitrate
D) silver nitrate
E) potassium nitrate
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The correct answer is D .