Acids Bases and Salts Test

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Acids Bases and Salts Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

Some substances are acidic while others are basic. A scale called the pH scale is used to measure the extent of acidity. What will happen to the pH of the solution if a little acid is added to a beaker of water (original pH$$=7$$)?

A
It will become a little less than $$7$$

B
It will become a little more than $$7$$

C
It will remain $$7$$

D
It will become $$0$$

Solution

If a little acid is added to a beaker of water (original $$pH=7$$), then $$pH$$ will become a little less than 7.
When we add acid to neutral water, hydrogen ion concentration increases. It will decrease $$pH$$ and the solution will become acidic.
Question 2
1 / -0

A chemical which turns red litmus to blue is:

A
acidic in nature

B
basic in nature

C
neutral in nature

D
can be acidic or basic in nature

Solution

Litmus paper is used to find out the acidic or basic nature of a solution. Following observations takes place when an acidic or basic solution interact with litmus paper.

$$\left.\begin{matrix} Acid & \rightarrow & Blue\, to \, Red \\ Base & \rightarrow & Red \, to \, Blue \end{matrix}\right\}$$ Litmus paper colour change

Thus, the chemical compound would be basic in nature.
Question 3
1 / -0

Ammonia is basic in nature. Hence it turns:

A
red litmus to blue

B
blue litmus to red

C
white litmus to red

D
white litmus to blue

Solution

Red litmus turns blue under basic or alkaline conditions.

Ammonia is basic in nature hence it will turn red litmus to blue.

Hence, option $$A$$ is correct.
Question 4
1 / -0

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colour would be observed ?

A
Yellow in both acid and base

B
Yellow in acid and red in base

C
Pink in acid and yellow in base

D
Red in acid and blue in base

Solution

Turmeric is yellow in acidic and neutral solutions; is bright red in basic solutions.
Question 5
1 / -0

Which of the following is acid-base indicator?

A
Ginger

B
Turmeric

C
Clove

D
None of these

Solution

Turmeric is a naturally occurring yellow colour compound. It is an acid-base indicator, turmeric compound remains yellow when acid or neutral solutions are added to it. When basic solutions such as sodium hydroxide are added to it, the solution turns pinkish-red.
Question 6
1 / -0

When a blue litmus paper is dipped in a solution, it remains blue. What can be concluded about this solution?

A
Th solution is neutral.

B
The solution is basic or neutral.

C
The solution is acidic or neutral.

D
None of the above.

Solution

Litmus paper is used for the identification of an acidic or basic solution. When it is dipped in a solution, its colour changes(or doesn't changes) indicating the nature of the solution.

Solution Colour of Litmus
Acidic solution Red remains red, blue changes to red
Basic solution Blue remains blue, red changes to blue
Neutral solution No change in colour (Red/ Blue)

Thus, we conclude that the given solution is basic or neutral in nature because the litmus paper colour remains blue after dipping the solution.
Question 7
1 / -0

A solution changes the colour of turmeric paper from yellow to red. The solution is:

A
basic

B
acidic

C
neutral

D
either neutral or acidic

Solution

Turmeric can be used as a natural indicator. Turmeric paper is made by applying turmeric paste to blotting paper. It changes its colour to bright red in basic solutions.
Question 8
1 / -0

Acid turns blue litmus to:

A
White

B
Yellow

C
Red

D
Green

Solution

Acids turn blue litmus to red because this is the identification test used for the identification of acids.
Question 9
1 / -0

Olfactory indicator among the following is:

A
clove

B
turmeric

C
soap

D
rose petals

Solution

Olfactory indicators are indicators which help us to identify whether the solution is acidic or basic in nature by changing their smell rather than the colour. Example: clove, onion, etc.

Hence, the option A is correct.
Question 10
1 / -0

Which of the following statement is correct?

A
Sodium hydroxide turns blue litmus red

B
Nitric acid turns red litmus blue

C
Sodium hydroxide turns red litmus blue

D
Nitric acid does not change blue litmus to red

Solution

A. False. Sodium hydroxide is basic in nature. A blue litmus will remain blue.

B. False. Nitric acid is acidic in nature and so red litmus remains red.

C. True. Sodium hydroxide is basic in nature and converts red litmus to blue.

D. False. Nitric acid is acidic and so blue litmus will turn red.
Hence, option C is correct.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 38

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Acids Bases and Salts Test - 38

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SHARING IS CARING

Question 1

It will become a little less than $$7$$

It will become a little more than $$7$$

It will remain $$7$$

It will become $$0$$

Solution

Question 2

acidic in nature

basic in nature

neutral in nature

can be acidic or basic in nature

Solution

Question 3

red litmus to blue

blue litmus to red

white litmus to red

white litmus to blue

Solution

Question 4

Yellow in both acid and base

Yellow in acid and red in base

Pink in acid and yellow in base

Red in acid and blue in base

Solution

Question 5

Ginger

Turmeric

Clove

None of these

Solution

Question 6

Th solution is neutral.

The solution is basic or neutral.

The solution is acidic or neutral.

None of the above.

Solution

Question 7

basic

acidic

neutral

either neutral or acidic

Solution

Question 8

White

Yellow

Red

Green

Solution

Question 9

clove

turmeric

soap

rose petals

Solution

Question 10

Sodium hydroxide turns blue litmus red

Nitric acid turns red litmus blue

Sodium hydroxide turns red litmus blue

Nitric acid does not change blue litmus to red

Solution

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