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 461: Which of the following metals can be prepared in samples by the thermal decomposition of their trioxonitrate (V) salts?
Options:
A) Copper and mercury
B) Silver and copper
C) Mercury and silver
D) Magnesium and mercury
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The correct answer is C .
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Question 462: The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N=14.0,O=16.0)
Options:
A) N2O2
B) NO
C) NO2
D) N2O
E) N2O3
Show Answer
The correct answer is C .
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Question 463:
What is the common name for ethanoic acid?
Options:
A) Acetic acid
B) Butyric acid
C) Propionic acid
D) Formic acid
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The correct answer is A .
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Question 464: On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?
Options:
A) Ca(NO3)2
B) Cu(NO3)2
C) AgNO3
D) NaNO3
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The correct answer is C .
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Question 465: Which of the following metals is passive to concentrated trioxonitrate (V) acid?
Options:
A) Iron
B) Tin
C) Copper
D) Zinc
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The correct answer is A .
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Question 466: The product formed when propanol is heated over a copper catalyst in the absence of oxygen are
Options:
A) CH3CH2CHO and H2
B) CH3CHO and CO2
C) CH3CH2COOH and H2
D) CH3COOH and CO2
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The correct answer is D .
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Question 467: Crude petroleum pollutant usually seen on some Nigerian creeks and waterways can be dispersed or removed by
Options:
A) heating the affected parts in order to boil off the petroleum
B) mechanically stirring to dissolve the petroleum in water
C) pouring organic solvents to dissolve the petroleum
D) spraying the water with stergents
E) cooling to freeze out the petroleum
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The correct answer is C .
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Question 468: The furring of kettles is caused by the presence in water of
Options:
A) calcium hydrogentrioxocarbonate (IV)
B) calcium trioxocarbonate (IV)
C) calcium tetraoxosulphate (VI)
D) calcium hydroxide
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The correct answer is B .
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Question 469:
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
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The correct answer is A .
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Question 470: Which of the following statements is true?
Options:
A) an increase in the temperature of a given mass of gas increases the number of gas molecules
B) an increase in the temperature of the gas does not affect the kinetic energy
C) an increase in the pressure of the gas is proportional to the increase in volume
D) a decrease in the pressure of a gas is proportional to the decrease in volume at constant temperature
E) a decrease in the pressure of the gas decreases the number of gas molecules present
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The correct answer is D .