Acids Bases and Salts Test

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Acids Bases and Salts Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

Acids generate ______ and bases generate ________ ions in water.

A
$$H^-$$, $$OH^+$$

B
$$OH^-$$, $$OH^+$$

C
$$OH^-$$, $$H^+$$

D
$$H^+$$, $$OH^-$$
Solution
- An acid is any substance that ionizes when it dissolves in water to give the $$H^+$$or hydrogen ion.
- A base is any substance that gives the $$OH^-$$ or hydroxide ion when it dissolves in water.
Therefore, we can say acids generate $$H^+$$ and bases generate $$OH^-$$ ions in water.
Question 2
1 / -0

Which of the following is not a property of an alkali?

A
They do no dissolve in water

B
They are soapy to touch

C
They are bitter

D
They are corrosive

Solution

An alkali is a base that dissolves in water.
Hence, option $$A$$ is incorrect.
Question 3
1 / -0

Statement A: Tamarind contains tartaric acid
Statement B- Vinegar contains acetic acid
Choose the correct option:

A
Statement A is correct and Statement B is incorrect.

B
Both Statement A and Statement B are incorrect.

C
Statement A is incorrect and Statement B is correct.

D
Both Statement A and B are correct.

Solution

Tamarind pulp contains tartaric acid and vinegar contains acetic acid. Therefore, option $$D$$ is correct.
Question 4
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X is a colourless gas with a distinct odour which consist of nitrogen and hydrogen atoms. It is produced naturally in the human body and in nature. Which gas is it? Is it acidic or basic in nature?

A
Ammonia, Acidic

B
Hydrogen Chloride, Acidic

C
Ammonia, Basic

D
Hydrogen Chloride, Basic

Solution

Ammonia is a colourless gas which is made up of nitrogen and hydrogen atoms. It is produced naturally in the human body and also present in nature, in soil, water, and air.
Question 5
1 / -0

Which one of the following can be used as an acid-base indicator by a visually impaired student?

A
Litmus

B
Turmeric

C
Vanilla essence

D
Petunia leaves

Solution

An acid base indicator shows a colour change from red to blue or blue to red which is not recognisable by a visually impaired student. To detect this change, an olfactory indicator is required which gives a particular odour during this colour change. So vanilla essence is used because of its fruity smell.
Question 6
1 / -0

Calcium phosphate is present in tooth enamel. Its nature is __________.

A
basic

B
acidic

C
neutral

D
amphoteric

Solution

Tooth enamel is one of the four major tissues that make up the tooth in humans and many other animals. It makes up the visible part of the tooth covering the crown. The other major tissues are dentin, cementum and dental pulp. It protects the teeth but can be easily decayed and destroyed. It is the hardest substance in the human body and contains the highest percentage of minerals 96% . This mineral is hydroxyapetite which is crystalline calcium phosphate. In humans enamel varies in thickness over the surface of the tooth thickest at the cusps and thinnest at the border.
$${ Ca }_{ 10 }{ (PO }_{ 4 })_{ 6 }{ (OH) }_{ 2 }\left( s \right) +8{ H }^{ + }\left( aq \right) \rightarrow 10{ Ca }^{ 2+ }\left( aq \right) +6{ HPO }_{ 4 }^{ 2- }\left( aq \right) +2{ H }_{ 2 }O\left( l \right)$$
Question 7
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

Sodium carbonate is a basic salt which is formed by the combination of sodium hydroxide and carbonic acid.

Sodium hydroxide is a strong base, while cabonic acid is a weak acid resulting in the formation of sodium carbonate salt.

$$2NaOH+{ H }_{ 2 }{ CO }_{ 3 }\rightarrow { Na }_{ 2 }{ CO }_{ 3 }+2{ H }_{ 2 }O$$
Question 8
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

The gas that evolved is carbon dioxide gas which has the property of turning lime water milky. It can extinguish the burning candle or splinter and it gets dissolved in sodium hydroxide solution to form sodium carbonate but this gas is odourless in nature. So, the last statement is false regarding the evolved gas.

$$NaHCO_3 + CH_3COOH \rightarrow H_2O + CO_2 + CH_3COONa$$
Question 9
1 / -0

Which of the following is used for dissolution of gold?

A
Hydrochloric acid

B
Sulphuric acid

C
Nitric acid

D
Aqua regia

Solution

Aqua regia is a chemical solution that is obtained by mixing one part nitric acid and three parts hydrochloric acid. It can dissolve gold, platinum, titanium, and other noble metals.
Question 10
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 hydrogencarbonate

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

D
Neutralise the acid with a strong alkali

Solution

Some of the acids like sulphuric acid, nitric acid can be neutralized by adding bases like sodium carbonate or sodium hydrogen carbonate. That is the reason for applying a paste of carbonate solution on a skin spill by an acid solution.

Sulphuric acid spills or fumes are fatal as these can cause respiratory problems. It is better to start the cleanup by pouring sodium bicarbonate into the affected area. This is included in most acid spill kits but regular baking powder, soda ash, or cat litter have the same effect.

Sodium bicarbonate is a good choice because it will absorb the sulphuric acid and cause it to clump which in turn makes it easier to pick up and dispose of safely.

Hence, option B is the correct answer.

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Acids Bases and Salts Test - 26

Result

Acids Bases and Salts Test - 26

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SHARING IS CARING

Question 1

$$H^-$$, $$OH^+$$

$$OH^-$$, $$OH^+$$

$$OH^-$$, $$H^+$$

$$H^+$$, $$OH^-$$

Solution

Question 2

They do no dissolve in water

They are soapy to touch

They are bitter

They are corrosive

Solution

Question 3

Statement A is correct and Statement B is incorrect.

Both Statement A and Statement B are incorrect.

Statement A is incorrect and Statement B is correct.

Both Statement A and B are correct.

Solution

Question 4

Ammonia, Acidic

Hydrogen Chloride, Acidic

Ammonia, Basic

Hydrogen Chloride, Basic

Solution

Question 5

Litmus

Turmeric

Vanilla essence

Petunia leaves

Solution

Question 6

basic

acidic

neutral

amphoteric

Solution

Question 7

strong acid and strong base

weak acid and weak base

strong acid and weak base

weak acid and strong base

Solution

Question 8

(i) and (ii)

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i) and (iv)

Solution

Question 9

Hydrochloric acid

Sulphuric acid

Nitric acid

Aqua regia

Solution

Question 10

Wash the hand with saline solution

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

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

Neutralise the acid with a strong alkali

Solution

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