Acids Bases and Salts Test

Result

Acids Bases and Salts Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

The colours of red litmus paper in acidic, neutral, and basic solutions are:

A
red, orange and blue respectively

B
blue, violet and red respectively

C
red, colourless and blue respectively

D
red, red and blue respectively

Solution

Solution Colour of red litmus paper
Acidic Red
Neutral Red
Basic Blue
So, the correction option is D.
Question 2
1 / -0

Which solution is a conjugate acid/base pair with differing spectral absorbencies?

A
Chemical pH indicator

B
Acid/base buffer

C
Anhydrous solution

D
Hypotonic solution

E
Supersaturated solution

Solution

Chemical pH indicator is a conjugate acid/base pair with differing spectral absorbencies.
It is used to indicate the endpoint of the titration.
For example, phenolphthalein is colourless in acid solution and pink in colour in alkaline solution.
Also, litmus is red in acid solution and blue in alkaline solution.
Hence, the correct option is A.
Question 3
1 / -0

The chemical name of "Oil of Vitriol" is:

A
nitric acid

B
hydrochloric acid

C
potassium hydroxide

D
sulphuric acid

Solution

Sulphuric acid was first discovered by the liquefaction of green vitriol ($$ { Fe }{ SO }_{ 4 }.7{ H }_{ 2 }O $$). Hence, it is called the oil of vitriol.
Question 4
1 / -0

The acidic or basic nature of a substance is tested by using:

A
Indicator

B
Litmus paper

C
Salt solution

D
Both A and B

Solution

litmus paper is used to detect the acidic or basic nature of a substance. Color of litmus paper in acid: Blue litmus paper turns red when dipped in acidic solution.
Acid-Base indicators (also known as pH indicators) are substances that change color with ph.
Question 5
1 / -0

An organic dye, cousins used to detect the endpoint of precipitation titration by the process of

A
absorption

B
adsorption

C
chemical reaction

D
none of the above

Solution

An organic dye, cosine used to detect the endpoint of precipitation titration by adsorption, is called an adsorption indicator. This is also called Argentometry titration.

Argentometry is a type of titration involving the silver(I) ion. Typically, it is used to determine the amount of chloride present in a sample. The sample solution is titrated against a solution of silver nitrate of known concentration. Chloride ions react with silver(I) ions to give the insoluble silver chloride:

$$Ag^+ +Cl^- \longrightarrow AgCl (K=5.88\times 10^9$$)

The yellow fluorescein is a common example used for the reaction i.e., -

$$NaCl (aq) + AgNO_3 (aq)\rightarrow AgCl (s) +NaNO_3 (aq)$$
Question 6
1 / -0

Ant bite is treated by application of __________.

A
washing soda

B
baking soda

C
neutral solution

D
acidic solution

Solution

$$\bf{Hint-}$$ Study about the reactions of acids and bases.

$$\bf{Concept-}$$
When acid is mixed with the base it neutralizes the reaction and gives salt as a product.

$$\bf{Explanation-}$$
The ant bites are acidic in nature. So, its effects can be neutralized by bicarbonate of soda such a baking soda or an alkali (i.e basic in nature).

$$\bf{Correct\ option-}$$
Option B is correct.
Question 7
1 / -0

A substance which tastes bitter and turns red litmus to blue is called a .......... .

A
Base

B
Acid

C
Neutral

D
None of the above

Solution

A substance is called base if its aqueous solution tastes bitter, turns red litmus blue, or neutralizes acids.
Question 8
1 / -0

Which of the following is true?

A
Litmus is extracted from mulberry trees

B
Litmus is a water soluble mixture of different dyes

C
Litmus is extracted from different trees

D
Litmus is the universal indicator

Solution

A. This is statement is wrong as litmus is extracted from different species of lichens and not mulberry trees.
B. This statement is correct. Litmus is a water-soluble mixture extracted from lichens.
C. This statement is again wrong.
D. This statement is wrong as litmus is a natural indicator and not a universal indicator.
Question 9
1 / -0

An indicator $$InH$$ has $${K_{In}}$$ value of $${10^{ - 7}}$$, it may exist in its molecular and ionic state in approximately $$1:1$$ ratio in which substance:

A
lemon juice

B
black coffee

C
milk

D
lime water
Question 10
1 / -0

Litmus is an extract of which of the following?

A
China rose

B
Beetroot

C
Lichen

D
Blur berries

Solution

Litmus is extracted from different species of 'lichens'. Litmus solution or paper is commonly used to test whether the solution is acidic or basic in nature.

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Re-Attempt Weekly Quiz Competition

Solution	Colour of red litmus paper
Acidic	Red
Neutral	Red
Basic	Blue

Acids Bases and Salts Test - 17

Result

Acids Bases and Salts Test - 17

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Question 1

red, orange and blue respectively

blue, violet and red respectively

red, colourless and blue respectively

red, red and blue respectively

Solution

Question 2

Chemical pH indicator

Acid/base buffer

Anhydrous solution

Hypotonic solution

Supersaturated solution

Solution

Question 3

nitric acid

hydrochloric acid

potassium hydroxide

sulphuric acid

Solution

Question 4

Indicator

Litmus paper

Salt solution

Both A and B

Solution

Question 5

absorption

adsorption

chemical reaction

none of the above

Solution

Question 6

washing soda

baking soda

neutral solution

acidic solution

Solution

Question 7

Base

Acid

Neutral

None of the above

Solution

Question 8

Litmus is extracted from mulberry trees

Litmus is a water soluble mixture of different dyes

Litmus is extracted from different trees

Litmus is the universal indicator

Solution

Question 9

lemon juice

black coffee

milk

lime water

Question 10

China rose

Beetroot

Lichen

Blur berries

Solution

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