Acids Bases and Salts Test

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Acids Bases and Salts Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) The temperature of the solution increases

(ii) The temperature of the solution decreases

(iii)The temperature of the solution remains the same

(iv) Salt formation takes place

A
(i) only

B
(i) and (iii)

C
(ii) and (iii)

D
(i) and (iv)

Solution

When an acid is mixed with a base; it results in neutralization reaction. Neutralization reaction results in formation of salt. Neutralization reaction is exothermic reaction.
Question 2
1 / -0

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

A
Baking powder

B
Lime

C
Ammonium hydroxide solution

D
Hydrochloric acid

Solution

If an aqueous solution turns red litmus solution to blue, it means that the given solution is basic. Its effect can be neutralized by an acidic solution.
Question 3
1 / -0

During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

A
Absorb the evolved gas

B
Moisten the gas

C
Absorb moisture from the gas

D
Absorb Cl⁻ ions from the evolved gas

Solution

The role of calcium chloride taken in the guard tube is to absorb moisture from the gas.
Question 4
1 / -0

Which of the following salts does not contain water of crystallisation?

A
Blue vitriol

B
Baking soda

C
Washing soda

D
Gypsum

Solution

Other salts in the options usually appear as crystalline salts, but baking soda appears as white powder. Crystalline salts contain water of crystallization.
Question 5
1 / -0

Sodium carbonate is a basic salt because it is a salt of

A
Strong acid and strong base

B
Weak acid and weak base

C
Strong acid and weak base

D
Weak acid and strong base

Solution

A salt of strong base and weak acid produces basic salt. Sodium is a strong base and carbonate is a weak acid.
Question 6
1 / -0

Calcium phosphate is present in tooth enamel. Its nature is

A
Basic

B
Acidic

C
Neutral

D
Amphoteric

Solution

Phosphate ion comes from phosphoric acid; which is a strong base. Hence, calcium phosphate is basic salt. Moreover, the fact that tooth enamel gets damaged by acid shows that calcium phosphate is basic in nature.
Question 7
1 / -0

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

A
Lemon juice

B
Vinegar

C
Common salt

D
An antacid

Solution

Since soil mixture is turning the pH paper yellowish-orange, hence soil is acidic in nature. So, adding an antacid would change the colour to greenish-blue
Question 8
1 / -0

Which of the following gives the correct increasing order of acidic strength?

A
Water<Acetic acid<Hydrochloric acid

B
Water<Hydrochloric acid<Acetic acid

C
Acetic acid<Water<Hydrochloric acid

D
Hydrochloric acid<Water<Acetic acid

Solution

Distilled water is neutral. Acetic acid is an organic acid so it is less acidic than hydrochloric acid which is an inorganic acid.
Question 9
1 / -0

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

A
Wash the hand with saline solution

B
Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

C
After washing with plenty of water apply solution of sodium hydroxide on the hand

D
Neutralise the acid with a strong alkali

Solution

Washing the hand with plenty of water will minimize the presence of acid. Further, application of sodium hydrogen carbonate will neutralize any remaining acid. Sodium hydroxide is corrosive in nature, so it should not be used.
Question 10
1 / -0

Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?

(i) It turns lime water milky

(ii) It extinguishes a burning splinter

(iii) It dissolves in a solution of sodium hydroxide

(iv) It has a pungent odour

A
(i) and (ii)

B
(i), (ii) and (iii)

C
(ii), (iii) and (iv)

D
(i) and (iv)

Solution

This reaction produces carbon dioxide gas. Carbon dioxide turns lime water milky and extinguishes a burning splinter.

Acid + Metal hydrogen carbonate → Salt + Carbon dioxide + Water

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Acids Bases and Salts Test - 17

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Acids Bases and Salts Test - 17

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Question 1

(i) only

(i) and (iii)

(ii) and (iii)

(i) and (iv)

Solution

Question 2

Baking powder

Lime

Ammonium hydroxide solution

Hydrochloric acid

Solution

Question 3

Absorb the evolved gas

Moisten the gas

Absorb moisture from the gas

Absorb Cl− ions from the evolved gas

Solution

Question 4

Blue vitriol

Baking soda

Washing soda

Gypsum

Solution

Question 5

Strong acid and strong base

Weak acid and weak base

Strong acid and weak base

Weak acid and strong base

Solution

Question 6

Basic

Acidic

Neutral

Amphoteric

Solution

Question 7

Lemon juice

Vinegar

Common salt

An antacid

Solution

Question 8

Water<Acetic acid<Hydrochloric acid

Water<Hydrochloric acid<Acetic acid

Acetic acid<Water<Hydrochloric acid

Hydrochloric acid<Water<Acetic acid

Solution

Question 9

Wash the hand with saline solution

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

After washing with plenty of water apply solution of sodium hydroxide on the hand

Neutralise the acid with a strong alkali

Solution

Question 10

(i) and (ii)

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i) and (iv)

Solution

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Absorb Cl⁻ ions from the evolved gas