Acids Bases and Salts Test

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Acids Bases and Salts Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Match the following with correct response.
(1) Strongly alkaline
(2) Weakly alkaline
(3) Weakly acidic
(4) Strongly acidic

(A) Yellow
(B) Violet
(C) Red
(D) Blue

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

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

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

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

Solution

The most basic (alkaline) solution has pH 14 and shows violet color.

The least basic (alkaline) solution has pH 8-9 and shows blue color.

The least acidic solution has pH 5-6 and shows yellow color.

The most acidic solution has pH 0-2 and shows red color.
Question 2
1 / -0

Match the following with correct response.
(1) Sodium carbonate
(2) Plaster of Paris
(3) calcium oxychloride
(4) Sodium bicarbonate

(A) Fire extinguishers
(B) For ornamental casting
(C) For water softening
(D) For bleaching wool

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

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

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

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

Solution

Sodium carbonate is used for removing permanent hardness of water.

Plaster of Paris is used for ornamental casting on the ceilings of house.

Calcium oxychloride is used for bleaching wool.

Sodium bicarbonate is used in fire extinguishers.
Question 3
1 / -0

Match the following with correct response.
(1) Bleaching powder
(2) Baking soda
(3) Washing soda
(4) Plaster of Paris

(A) Calcium oxychloride
(B) Sodium carbonate
(C) Sodium bicarbonate
(D) Calcium sulphate hemihydrate

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

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

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

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

Solution

Bleaching powder is calcium oxychloride (CaOCl₂).

Baking soda is sodium bicarbonate (NaHCO₃).

Washing soda is sodium carbonate (Na₂CO₃.10H₂O).

Plaster of Plaster is calcium sulphate hemihydrate (CaSO₄.1\2H₂O).
Question 4
1 / -0

Match the following with correct response.
(1) Soluble salt
(2) Normal salt
(3) Hydrated salt
(4) Insoluble Salt

(A) NaCl
(B) BaSO₄
(C) CuSO₄. 5H₂O
(D) KNO₃

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

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

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

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

Solution

Potassium nitrate (KNO₃) is a soluble salt.

Sodium chloride (NaCl) is a normal salt.

CuSO₄.5H₂O is a hydrated salt as it contains 5 molecules of water of crystallisation.

BaSO₄ is an insoluble salt.
Question 5
1 / -0

What is the pH of a solution which turns red litmus blue?
A. 2
B. 6
C. 8
D. 10

A
A, B and D

B
All of these

C
C and D

D
B and C

Solution

A basic solution turns red litmus blue and it has pH in-between 8 to 14.

Since (C) and (D) lies in that range, therefore, they will turn blue litmus red.
Question 6
1 / -0

Which of the following statements are correct?
A. Chemical name of bleaching powder is calcium oxychloride.
B. Bleaching powder is used for sterilization of drinking water.
C. Bleaching powder is alkaline in nature hence it is used as antacid.
D. Bleaching powder is manufactured by Hasen Clever process.

A
A and C

B
B and C

C
All of these

D
A, B and D

Solution

Formula for bleaching powder is CaOCl₂. It has chlorine available which acts as a disinfectant. It cannot be used as an antacid because it is non-edible. Hans Clever is the most economical method of manufacturing bleaching powder.
Question 7
1 / -0

Which of the following properties are shown by dilute hydrochloric acid-
A. It turns blue litmus red
B. It turns red litmus blue
C. It reacts with zinc metal and a gas evolves
D. It reacts with solid sodium carbonate to give brisk effervescence

A
A, C and D

B
A, B and D

C
A and B

D
A and C

Solution

HCl being an acid turns blue litmus red.

HCl reacts with zinc metal to evolve hydrogen gas.

HCl reacts with solid sodium carbonate (Na₂CO₃) to evolve carbon dioxide (CO₂) gas.
Question 8
1 / -0

Sodium carbonate
A. is a transparent crystalline white solid
B. Has the chemical formula Na₂CO₃.10H₂O
C. Gives acidic solution when dissolves in water
D. Prepared by reacting with chlorine

A
All of these

B
A and C

C
C and D

D
A and B

Solution

(C) and (D) are incorrect because the solution of washing soda in water is alkaline which turns red litmus blue. And washing soda is prepared from sodium chloride.
Question 9
1 / -0

Which of the following statements are correct abount an aqueous solution of an acid and of a base?
A. lower the pH weaker the base
B. Lower the pH stronger the base
C. higher the pH stronger the acid
D. higher the pH weaker the acid

A
A and D

B
All of these

C
B and C

D
A and C

Solution

Both (A) and (D) are correct. Higher the pH, stronger is the base. Basicity of a solution increases from pH value 8 to14.

Lower the pH, higher is the acidity. Acidity of a solution increases from 6 to 0.

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Acids Bases and Salts Test - 13

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Acids Bases and Salts Test - 13

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Question 1

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

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

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

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

Solution

Question 2

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

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

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

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

Solution

Question 3

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

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

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

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

Solution

Question 4

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

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

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

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

Solution

Question 5

A, B and D

All of these

C and D

B and C

Solution

Question 6

A and C

B and C

All of these

A, B and D

Solution

Question 7

A, C and D

A, B and D

A and B

A and C

Solution

Question 8

All of these

A and C

C and D

A and B

Solution

Question 9

A and D

All of these

B and C

A and C

Solution

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