Acids Bases and Salts Test

Result

Acids Bases and Salts Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

A gas produced in the lab is highly soluble in water. Its colorless solution turns pink when a few drops of phenolphthalein is added to it. What is the nature of the gas?

A
Acidic

B
Neutral

C
Amphoteric

D
Basic

Solution

Phenolphthalein gives a pink colour with a base and remains colourless with an acid.
Question 2
1 / -0

Statement A : Sulphuric acid is diprotic acid and phosphoric acid is triprotic acid.

Statement B : Chlor-alkali process is involved in the manufacturing of bleaching powder

A
Neither statement A nor statement B is true

B
Statement A is true, B is false

C
Both statements A and B are true.

D
Statement B is true, A is false

Solution

Sulphuric acid (H₂SO₄) contains two hydrogen atoms per molecule which are capable of dissociating. Phosphoric acid (H₃PO₄) can donate three hydrogen ions per molecule during dissociation.

Chlor-alkali process is electrolytic decomposition of brine (aqueous solution of sodium chloride) to form sodium hydroxide and chlorine. Chlorine produced is used to produce bleaching powder.
Question 3
1 / -0

What happens when sodium hydroxide reacts with sulphuric acid completely?

A
Neutral salt is formed

B
Neutralisation reaction occur

C
Na₂SO₄ and water are produced

D
All of these

Solution

The reaction can be written as:

2NaOH(aq) + H₂SO₄(aq) → Na₂SO₄(aq) + 2H₂O(l)

It is a neutralisation reaction in which a netral salt (Na₂SO₄) is formed.
Question 4
1 / -0

Under what soil condition do you think a farmer would spread or treat the soil of his fields with quick lime (CaO) or slaked time (CaCO₃) ?

A
When the nutrients of the soil is lost

B
All of these

C
When the pH of the soil decreases

D
When the pH of the soil increases

Solution

When the pH of the soil becomes acidic, slaked lime or quick lime is added to neutralise the soil.
Question 5
1 / -0

The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration?

A
Solution B

B
Solution A

C
None of these

D
Same conc. in both A and B

Solution

Solutions having pH less than 7 are acidic. Lower the value of pH, more is the concentration of hydrogen ion and thus more is the acidity.
Question 6
1 / -0

Match the following with correct response.

(1) Citric acid (A) Vinegar

(2) acetic acid (B) tamarind

(3) Nitric acid (C) mineral acid

(4) Tartaric acid (D) Lemon

A
1-B, 2-D, 3-A, 4-C

B
1-C, 2-B, 3-D, 4-A

C
1-D, 2-A, 3-C, 4-B

D
1-A, 2-C, 3-B, 4-D

Solution

Lemon conatins citric acid, vinegar contains acetic acid, nitric acid is a mineral acid and tamarind contains tartaric acid.
Question 7
1 / -0

Match the following with correct response.

(1) Sodium hydroxide (A) Antacid

(2) Potassium hydroxide (B) Caustic soda

(3) Calcium hydroxide (C) Curd

(4) Lactic acid (D) Caustic potash

A
1-A, 2-C, 3-B, 4-D

B
1-C, 2-B, 3-D, 4-A

C
1-B, 2-D, 3-A, 4-C

D
1-D, 2-A, 3-C, 4-B

Solution

Caustic soda chemically is sodium hydroxide, caustic potash is chemically potassium hydroxide, antacid contains calcium hydroxide and curd contains lactic acid
Question 8
1 / -0

Match the following with correct response.

(1) Metal oxides (A) Hydroxyl Ions

(2) Non-metal oxides (B) Acidic

(3) Salts (C) Basic

(4) Bases (D) Neutral

A
1-B, 2-D, 3-A, 4-C

B
1-D, 2-A, 3-C, 4-B

C
1-A, 2-C, 3-B, 4-D

D
1-C, 2-B, 3-D, 4-A

Solution

Metal oxides are basic in nature because they release hydroxyl ions after hydrolysis and non-metals oxides are acidic in nature because they release hydrogen ions after hydrolysis. Salts formed by acids and bases of equal strengths are neutral in nature. Bases release hydroxyl ions on hydrolysis.
Question 9
1 / -0

Match the following with correct response.
(1) Acidic solution
(2) Basic Solution
(3) Neutral Solution
(4) Highly acidic solution

(A) pH 8
(B) pH 1
(C) pH 7
(D) pH 5

A
1-B, 2-D, 3-A, 4-C

B
1-A, 2-C, 3-B, 4-D

C
1-D, 2-A, 3-C, 4-B

D
1-C, 2-B, 3-D, 4-A

Solution

The pH range of acids is 1-7 and that of bases is 7-14. Substances with pH 7 are said to be neutral. Lower is the value of pH, higher is the acidity or acidic strength and greater is the value of pH, the more is the basicity.

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Re-Attempt Weekly Quiz Competition

(1) Citric acid	(A) Vinegar
(2) acetic acid	(B) tamarind
(3) Nitric acid	(C) mineral acid
(4) Tartaric acid	(D) Lemon

(1) Sodium hydroxide	(A) Antacid
(2) Potassium hydroxide	(B) Caustic soda
(3) Calcium hydroxide	(C) Curd
(4) Lactic acid	(D) Caustic potash

(1) Metal oxides	(A) Hydroxyl Ions
(2) Non-metal oxides	(B) Acidic
(3) Salts	(C) Basic
(4) Bases	(D) Neutral

Acids Bases and Salts Test - 12

Result

Acids Bases and Salts Test - 12

Score

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Rank

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Question 1

Acidic

Neutral

Amphoteric

Basic

Solution

Question 2

Neither statement A nor statement B is true

Statement A is true, B is false

Both statements A and B are true.

Statement B is true, A is false

Solution

Question 3

Neutral salt is formed

Neutralisation reaction occur

Na2SO4 and water are produced

All of these

Solution

Question 4

When the nutrients of the soil is lost

All of these

When the pH of the soil decreases

When the pH of the soil increases

Solution

Question 5

Solution B

Solution A

None of these

Same conc. in both A and B

Solution

Question 6

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

Solution

Question 7

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

Solution

Question 8

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

Solution

Question 9

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

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Na₂SO₄ and water are produced