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 61: Detergents have the general formula?
Options:
A) R(CH2)nOH
B) RSO3-Na+
C) RSO-2Na+
D) RSO2H
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The correct answer is B .
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Question 62: A compound that will NOT produce oxygen on heating is?
Options:
A) potasium dioxonitrate (III)
B) lead (IV) oxide
C) potassium trioxochlorate (V)
D) potassium trioxonitrate (V)
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The correct answer is A .
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Question 63: A mixture of sugar and sulphur can be separated by
Options:
A) dissolution in water, evapouration and filtration
B) filtration, evaporation and dissolution in water
C) dissolution in water, filtration and evaporation
D) evaporation, dissolution in water and filtration
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The correct answer is C .
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Question 64:
The curve depicts titration between
Options:
A) Strong acid and strong base
B) Strong acid and weak base
C) Weak acid and weak base
D) Weak acid and strong base
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The correct answer is C .
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Question 65: When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
Options:
A) both gases change the colour of the solution from yellow to colourless
B) both gases causes sulphur to be deposited
C) only hydrogen sulphide decolourizes the solution
D) only sulphur dioxide deposits sulphur
E) only hydrogen sulphide deposits sulphur
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The correct answer is E .
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Question 66: According to charles' law, the volume of a gas becomes zero at
Options:
A) 0 oC
B) -100 oC
C) -273 oC
D) -373 oC
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The correct answer is C .
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Question 67:
An organic functional group which can likely decolorize ammoniacal silver nitrate is?
Options:
A) alkene
B) alkane
C) alkyne
D) alkanol
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The correct answer is C .
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Question 68: What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/
Options:
A) The blue colour of the solution disappears
B) Electrons flow from copper to zinc
C) The zinc rod remain undissolved
D) The copper generate more copper ions
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The correct answer is A .
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Question 69:
Proteins in acid solution undergo?
Options:
A) Substitution
B) Fermentation
C) Hydrolysis
D) Polymerisation
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The correct answer is C .
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Question 70:
An element X has two isotopes, 2010X and 2010X, present in the ratio 1:3. The relative atomic mass of X would be?
Options:
A) 20.5
B) 21.0
C) 21.5
D) 22.0
E) 22.5
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The correct answer is C .