Acids Bases and Salts Test

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Acids Bases and Salts Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are:

A
red and blue

B
blue and red

C
pink and colorless

D
colorless and pink

Solution

Phenolphthalein is a type of synthetic indicator which is colourless in acidic medium but gives pink colour in basic medium.
Question 2
1 / -0

Which of the following set of substances contain acids only?

A
Grapes, lime water

B
Vinegar, soap

C
Curd, milk of magnesia

D
Curd, vinegar

Solution

Curd contains lactic acid and vinegar contains acetic acid. Lime water, soap, and milk of magnesia are basic substances and grapes contain tartaric acid.
Question 3
1 / -0

Aqueous solution of $$ NaOC_2H_5 $$

A
Turns blue litmus red

B
Turns red litmus blue

C
Turn red litmus green

D
none of the above

Solution

An aqueous solution of $$NaOC_2H_5\ gives\ NaOH$$ and $$C_2H_5OH$$ and we know $$NaOH$$ is a strong base and base turns red litmus blue.
So option $$B$$ is correct
Question 4
1 / -0

Identify the tube(s) in which the colour of red litmus paper turns blue.

A
Test tube A

B
Test tube B

C
Test tube C

D
All of the above
Solution
We know that, red litmus paper turns blue in the presence of basic or alkaline medium.
Test tube A contains common salt, $$NaCl$$ which is neutral. Thus, it doesn't change the colour of any litmus paper.
Test tube B contains sugar which is also neutral. Thus, it doesn't change the colour of any litmus paper.
Test tube C contains calcium oxide, $$CaO$$ which is a metal oxide. Metal oxides are basic oxides. Thus, it turns red litmus paper to blue.
Hence, option C is correct.
Question 5
1 / -0

Which substance when dissolved in water changes red litmus paper to blue.

A
Tooth paste

B
Milk of magnesia

C
Shower cream

D
All of the above

Solution

Red litmus changes to blue under alkaline conditions.
A.) Tooth paste-$$NaF$$
B.)Milk of magnesia-$$Mg(OH)_2$$
C.)Shower cream- Basic ingredients used are alkaline in nature.
Hence, correct option is $$D$$.
Question 6
1 / -0

Starch paper is used to test for the presence of

A
Iodine

B
Oxidising agent

C
Iodine ion

D
Reducing agent

Solution

Starch paper are used for iodine test as:
$${I}^{-}+oxidant\rightarrow {I}_{2}$$
$${I}_{2}+starch\rightarrow blue\ colour$$
Question 7
1 / -0

A solution of methyl amine:

A
turns blue litmus red

B
turns red litmus blue

C
does not affect red or blue litmus

D
bleaches litmus

Solution

Methylamine is basic in nature. When it is tested with litmus paper, the red litmus turns blue, and the blue litmus remains unaffected. It does not have any bleaching effect on the litmus paper.
Option B is correct.
Question 8
1 / -0

Which of these is used to reduce the acidity of soil?

A
Calcium hydroxide

B
Ammonium sulphate

C
Ammonium nitrate

D
Ammonium chloride

Solution

$$\textbf{Concept Applied:}$$ Acidic substance increases acidity or reduces basicity, and vice versa.

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

$$\textbf{Explanation for correct option:}$$ For reducing acidity of soil, we need a basic substance. Of the given options, only calcium hydroxide is basic in nature.

$$\textbf{Explanation for incorrect options:}$$
(B) Ammonium sulphate is acidic, so it cannot be used as it will increase acidity.
(C) Ammonium nitrate is acidic, so it cannot be used as it will increase acidity.
(D) Ammonium chloride is acidic, so it cannot be used as it will increase acidity.
Question 9
1 / -0

A solution of sodium acetate in water will___________

A
turn red litmus blue

B
turn blue litmus red

C
not effect litmus

D
decolourises litmus

Solution

As, $$CH_3COONa$$ is a salt of weak acid and strong base its solution will have a basic pH.

$$CH_3COONa +H_2O \leftrightharpoons CH_3COOH +OH^-$$

So the basic solution will turn red litmus to blue.
Hence, option $$A$$ is correct.
Question 10
1 / -0

The colour of pH paper strip at the pH valued of $$ 1, 7 $$ and $$14$$ will be :

A
Green, red and blue

B
Red, green and blue

C
Blue, green and red

D
Green, blue and red

Solution

At pH value of 1, pH paper strip is red.
At pH value of 7, pH paper strip is green and at pH value of 14, pH paper strip is blue in colour .

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 15

Result

Acids Bases and Salts Test - 15

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SHARING IS CARING

Question 1

red and blue

blue and red

pink and colorless

colorless and pink

Solution

Question 2

Grapes, lime water

Vinegar, soap

Curd, milk of magnesia

Curd, vinegar

Solution

Question 3

Turns blue litmus red

Turns red litmus blue

Turn red litmus green

none of the above

Solution

Question 4

Test tube A

Test tube B

Test tube C

All of the above

Solution

Question 5

Tooth paste

Milk of magnesia

Shower cream

All of the above

Solution

Question 6

Iodine

Oxidising agent

Iodine ion

Reducing agent

Solution

Question 7

turns blue litmus red

turns red litmus blue

does not affect red or blue litmus

bleaches litmus

Solution

Question 8

Calcium hydroxide

Ammonium sulphate

Ammonium nitrate

Ammonium chloride

Solution

Question 9

turn red litmus blue

turn blue litmus red

not effect litmus

decolourises litmus

Solution

Question 10

Green, red and blue

Red, green and blue

Blue, green and red

Green, blue and red

Solution

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