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 221: 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 .
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Question 222: An example of a polysaccharides is?
Options:
A) —dextrose
B) mannose
C) glucose
D) starch
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The correct answer is D .
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Question 223:
How many neutrons are present in atom with mass number and atomic number 37 and 17 respectively?
Options:
A) 18
B) 20
C) 37
D) 17
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The correct answer is B .
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Question 224: When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of
Options:
A) Ca2+
B) Na+
C) Zn2+
D) K+
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The correct answer is A .
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Question 225:
The I.U.P.A.C name for the compound
Options:
A) 2-chloro-isopentane
B) 3-chloro-isopentane
C) 2-chloro-2-methylbutane
D) 1-chloro-2,2- dimethylpropane
E) 2-chloro-2-ethylpropane
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The correct answer is C .
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Question 226:
MnO2(s) + xHCl(aq) → MnCl2(aq) + yH2O(l) + zCl2(g)
In theequation above, what are the values of x, y and z respectively
Options:
A) 2, 1, 2
B) 4, 1, 2
C) 4, 2, 1
D) 1, 2, 1
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The correct answer is C .
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Question 227: Steam changes the colour of anhydrous cobalt (II) chloride from
Options:
A) blue to pink
B) white to red
C) white to green
D) blue to white
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The correct answer is A .
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Question 228: A trihydric alkanol is
Options:
A) Glycerol
B) Phenol
C) Glycol
D) Ethanol
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The correct answer is A .
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Question 229: Which of the following compounds can exist as geometric isomers?
Options:
A) 2-methylbut-2ene
B) But-2-ene
C) But-1-ene
D) CI-C-Br
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The correct answer is B .
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Question 230: Chlorination of water for town supply is carried out to
Options:
A) make the water colourless
B) remove germs from the water
C) make the water tastedful
D) remove odour from the water
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The correct answer is B .