Acids, Bases, and Salts CDS Questions

CDS Chemistry

Acids, Bases, and Salts MCQ Questions


13.
Methyl orange indicator shows which colours in acidic and basic media respectively?
A.
Blue in acidic medium, red in basic medium
B.
Yellow in acidic medium, red/pink in basic medium
C.
Red/pink in acidic medium, yellow in basic medium
D.
Colourless in acidic medium, pink in basic medium
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ANSWER :
C. Red/pink in acidic medium, yellow in basic medium
14.
Olfactory indicators help identify whether a solution is acidic or basic on the basis of:
A.
A change in their colour
B.
A change in their characteristic smell
C.
A change in their density
D.
A change in their boiling point
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ANSWER :
B. A change in their characteristic smell
15.
Concentrated sulphuric acid is widely used as a dehydrating agent in industries because it:
A.
Increases the moisture content of the substances it touches
B.
Releases water vapour when it reacts with other substances
C.
Acts only as a catalyst without affecting water content
D.
Has a strong affinity for water and removes moisture/water of crystallisation from substances
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ANSWER :
D. Has a strong affinity for water and removes moisture/water of crystallisation from substances
16.
The standard pH scale used to express the strength of acids and bases ranges from:
A.
1 to 7
B.
0 to 14
C.
-7 to +7
D.
0 to 10
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ANSWER :
B. 0 to 14
17.
pH of a solution is mathematically defined as:
A.
The total number of ions dissolved per litre of solution
B.
The simple ratio of H+ ions to OH- ions present
C.
The positive logarithm of the hydroxide ion concentration
D.
The negative logarithm (to the base 10) of the hydrogen ion concentration
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ANSWER :
D. The negative logarithm (to the base 10) of the hydrogen ion concentration
18.
A solution having a pH value of exactly 7 at room temperature is said to be:
A.
Weakly acidic
B.
Neutral
C.
Strongly acidic
D.
Strongly basic
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ANSWER :
B. Neutral