Acids Bases and Salts Test

Result

Acids Bases and Salts Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a natural indicator?

A
China rose

B
Blueberry

C
Morning glory

D
All of above

Solution

Natural indicators are obtained from natural sources. All the above examples are natural indicators. A solution of china rose turns green in a basic solution, and bright pink or magenta in an acidic solution. Morning glories contain an anthocyanin called "heavenly blue anthocyanin" which changes from purplish red at $$pH\: 6.6$$ to blue at $$pH\: 7.7$$. Blueberries change from blue (around $$pH \:2.8-3.2$$) to red in a strongly acidic solution.
Question 2
1 / -0

What appearance will the blue litmus paper have after being dipped into an acidic solution?

A
Red

B
Blue

C
White

D
Pink

Solution

Litmus paper is a commonly used acid-base indicator.
The red litmus paper turns blue in a basic medium but it remains unaffected in an acidic medium.
The blue litmus paper turns red in the acidic medium but it remains unaffected in the basic medium.
Hence, the correct answer is an option (A).
Question 3
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A student puts a drop of the reaction mixture of a saponification reaction first on a blue litmus paper and then on a red litmus paper. He may observe that:

A
there is no change in the blue litmus paper and the red litmus paper turns white

B
there is no change in the red litmus paper and the blue litmus paper turns red

C
there is no change in the blue litmus paper and the red litmus paper turns blue

D
no change in colour is observed in both the litmus papers

Solution

Saponification is the alkaline hydrolysis of the fatty acid esters.
Hence the solution is basic, bases with blue litmus gives no colour change.
On dipping red litmus paper in a mixture of saponification reaction it turns blue.
Option C is correct.
Question 4
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Which indicator is correctly paired up with its proper color if it were added to a base?

i. Litmus - blue
ii. Phenolphthalein - pink
iii. Methyl orange - yellow

A
(i) only

B
(ii) only

C
(iii) only

D
(i) and (iii) only

E
(i), (ii) and (iii)

Solution

Litmus - It is a type of natural indicator which is made up of lichens. In an acidic solution, its colour turns red. In the basic solution, its colour changes to blue.

Phenolphthalein - It is an acid-base indicator that turns colourless in acidic solution, and turns pink to red in alkaline solution. Here it is a weak base.

Methyl orange - It is a pH indicator. It turns red in acidic solution and yellowish in basic solution.

Hence, the correct option is E.
Question 5
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Which one of the following are the correct observations about acetic acid?

A
It turns blue litmus red and smells like vinegar

B
It turns blue litmus red and smells like burning sulphur

C
It turns red litmus blue and smells like vinegar

D
It turns red litmus blue and has a fruity smell

Solution

Acetic acid is a colourless liquid organic compound. It is a weak acid that turns blue litmus paper red. Vinegar is roughly 3–9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
Question 6
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What do we observe on pouring acetic acid on red and blue litmus paper?

A
Red litmus remains red and blue litmus turns red.

B
Red litmus turns blue and blue litmus remains blue.

C
Red litmus turns blue and blue litmus turns red.

D
Red litmus becomes colourless and blue litmus remains blue.

Solution

Acid turns blue litmus red and has no effect on red litmus. Hence, when acetic acid poured on blue litmus turns red whereas red remains red.
Question 7
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The acidic behaviour of lakes and oceans can be neutralized by:

A
$$NaOH$$

B
$$HCl$$

C
$$CaCO_3$$

D
$$Ca(OH)_2$$

Solution

Lakes and oceans can become acidic due to acid rain. This increases the acidity of such bodies and affects the aquatic life. To neutralize this acidic behavior of lakes and oceans, calcium carbonate $$(CaCO_3)$$ is used.
Question 8
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An example of a solution which is not in equilibrium is:

A
chemical pH indicator

B
acid/base buffer

C
anhydrous solution

D
hypotonic solution

E
supersaturated solution

Solution

In a supersaturated solution, the amount of solute in the solvent is greater than the amount that solvent can dissolve. equilibrium exists when the dissolution and crystallization continue as long as excess solute is present which is analogous to vapor pressure which happens only in a saturated solution.
Question 9
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Phenolpthalein is ____________ type of indicator.

A
Natural indicator

B
Universal indicator

C
Synthetic indicator

D
None of the above

Solution

Phenolpthalein is a synthetic indicator. It is colourless in acidic medium but gives pink colour in basic medium.
Question 10
1 / -0

When honeybee bites, which chemical enters in to our body?

A
Calcium formate

B
Melittin

C
Formic acid

D
Magnesium hydroxide

Solution

Melittin is a poisonous chemical that is added to our body by the bite of the honey bee.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 12

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Acids Bases and Salts Test - 12

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SHARING IS CARING

Question 1

China rose

Blueberry

Morning glory

All of above

Solution

Question 2

Red

Blue

White

Pink

Solution

Question 3

there is no change in the blue litmus paper and the red litmus paper turns white

there is no change in the red litmus paper and the blue litmus paper turns red

there is no change in the blue litmus paper and the red litmus paper turns blue

no change in colour is observed in both the litmus papers

Solution

Question 4

(i) only

(ii) only

(iii) only

(i) and (iii) only

(i), (ii) and (iii)

Solution

Question 5

It turns blue litmus red and smells like vinegar

It turns blue litmus red and smells like burning sulphur

It turns red litmus blue and smells like vinegar

It turns red litmus blue and has a fruity smell

Solution

Question 6

Red litmus remains red and blue litmus turns red.

Red litmus turns blue and blue litmus remains blue.

Red litmus turns blue and blue litmus turns red.

Red litmus becomes colourless and blue litmus remains blue.

Solution

Question 7

$$NaOH$$

$$HCl$$

$$CaCO_3$$

$$Ca(OH)_2$$

Solution

Question 8

chemical pH indicator

acid/base buffer

anhydrous solution

hypotonic solution

supersaturated solution

Solution

Question 9

Natural indicator

Universal indicator

Synthetic indicator

None of the above

Solution

Question 10

Calcium formate

Melittin

Formic acid

Magnesium hydroxide

Solution

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