Acids Bases and Salts Test

Result

Acids Bases and Salts Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

'Litmus', a natural dye is an extract of which of the following?

A
China rose (Gudhal)

B
Beetroot

C
Lichen

D
Blue berries (Jamun)

Solution

Litmus', a natural dye is extracted from Lichen which is a composite organism that emerges from algae.

Hence, option $$C$$ is correct.
Question 2
1 / -0

When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

A
Organic matter

B
Quick lime

C
Slaked lime

D
Calamine solution

Solution

$$\textbf{Concept Applied:}$$ Knowledge of $$pH$$ helps to determine the treatment that needs to be done on the soil.

$$\textbf{Correct Option:}$$ A

$$\textbf{Explanation for correct option:}$$
To improve quality and reduce the basic nature of the soil, the organic matter must be added to the soil. Organic matter releases acids that can neutralize the base of the soil and hence the quality of soil can be improved.

$$\textbf{Explanation for incorrect options:}$$
(B) Quick lime $$(CaO)$$ is basic so it will not be helpful.
(C) Slaked lime $$(Ca(OH)_2)$$ is also basic and not be helpful to reduce $$pH$$.
(D) Calamine $$(ZnCO_3)$$ is also basic and not be helpful to reduce $$pH$$.
Question 3
1 / -0

Neutralisation reaction is a

A
Physical and reversible change

B
Physical change that cannot be reversed

C
Chemical and reversible change

D
Chemical change that cannot be reversed

Solution

A chemical reaction where base and acid reacts with each other quantitatively is known as neutralization reaction. Since it is a chemical reaction, the changes brought by the reaction are irreversible.
Question 4
1 / -0

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

A
Basic

B
Either acidic or basic

C
Either acidic or neutral

D
Either basic or neutral

Solution

With acidic/neutral solutions, colour of phenolphthalein indicator will not change.
Question 5
1 / -0

Acid present in tamarind is:

A
lactic acid

B
citric acid

C
tartaric acid

D
acetic acid

Solution

$$\textbf {Tartaric acid }$$is the major acid present in tamarind pulp which gives the pulp acidic taste. Tamarind pulp also contains malic, succcinic, citric and quinic acid.
Question 6
1 / -0

Aqueous solution of a base

A
Turns blue litmus into red

B
Turns red litmus into blue

C
Turns litmus solution colourless

D
Has no effect on litmus solution
Solution
Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The conjugate base formed from the litmus acid has a blue color, so the wet red litmus paper turns blue in an alkaline solution.
Bases turn the color of red litmus paper to blue.
Hence, Option B is correct.
Question 7
1 / -0

Acids change blue litmus to?

A
White

B
Red

C
Black

D
Purple

Solution

Blue litmus paper turns red when dipped in acidic solution. On the other hand, bases turn red litmus blue.
Question 8
1 / -0

Aqueous solution of a base

A
turns blue litmus into red

B
turns red litmus into blue

C
turns litmus solution colourless

D
has no effect on colour of litmus paper

Solution

Solutions of bases turn red litmus to blue. Acidic solutions turn blue litmus red. Neutral solutions have no effect on colour of litmus paper.
Question 9
1 / -0

The compound used for neutralisation of excess $$HCl$$ in the stomach is:

A
Vinegar

B
$$Mg(OH)_{2}$$

C
Both A and B

D
None of these

Solution

Excess of $$HCl$$ in the stomach is neutralized by the base. $$Mg(OH)_2$$ is basic in nature. Hence, it is used to neutralize excess $$HCl$$ in the stomach.
Vinegar is acetic acid therefore it cannot neutralize the $$HCl$$ in the stomach.
Question 10
1 / -0

The nature of solution which turns blue litmus paper red is ......... .

A
acidic

B
basic

C
neutral

D
none of these

Solution

it must be acidic as an acidic solution turns blue litmus red.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 16

Result

Acids Bases and Salts Test - 16

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SHARING IS CARING

Question 1

China rose (Gudhal)

Beetroot

Lichen

Blue berries (Jamun)

Solution

Question 2

Organic matter

Quick lime

Slaked lime

Calamine solution

Solution

Question 3

Physical and reversible change

Physical change that cannot be reversed

Chemical and reversible change

Chemical change that cannot be reversed

Solution

Question 4

Basic

Either acidic or basic

Either acidic or neutral

Either basic or neutral

Solution

Question 5

lactic acid

citric acid

tartaric acid

acetic acid

Solution

Question 6

Turns blue litmus into red

Turns red litmus into blue

Turns litmus solution colourless

Has no effect on litmus solution

Solution

Question 7

White

Red

Black

Purple

Solution

Question 8

turns blue litmus into red

turns red litmus into blue

turns litmus solution colourless

has no effect on colour of litmus paper

Solution

Question 9

Vinegar

$$Mg(OH)_{2}$$

Both A and B

None of these

Solution

Question 10

acidic

basic

neutral

none of these

Solution

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