Acids Bases and Salts Test

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Acids Bases and Salts Test - 10

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Question 1
1 / -0

Manisha took a little bit of soil from her garden and mixed it with water. When she dipped a blue litmus in it, the litmus turned red. By adding which of the following to her garden will she get better plant growth?

A
Hydrochloric acid

B
Slaked lime

C
Water

D
Salt

Solution

Slaked lime is applied to acidic soils to regulate the soil's pH levels.
This allows for faster growth of crops by aiding the intake of nutrients and nitrogen by vegetation growing in the soil. It helps preserve stored fruits and vegetables when placed nearby in bags.
The bags absorb carbon dioxide emitted by the fruits and vegetables, regulating oxygen levels which prolongs their freshness.
Option B is correct.
Question 2
1 / -0

Which of the following statements are correct?

A
Acid turns blue litmus red.

B
Base turns red litmus blue.

C
Both A and B correct

D
Water changes the colour of red litmus.

Solution

An acidic solution turns blue litmus red. On the $$pH$$ scale, acids have values less than $$7$$.
A basic solution turns red litmus blue. On the $$pH$$ scale, bases have values more than $$7$$.

Water is neither acidic nor basic, which means it is neutral. So, it can not change the color of litmus paper. The $$pH$$ value for water is equal to $$7$$.
Question 3
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Caustic soda is the common name for:

A
$$\displaystyle { Mg\left( OH \right) }_{ 2 }$$

B
$$\displaystyle KOH$$

C
$$\displaystyle { Ca\left( OH \right) }_{ 2 }$$

D
$$\displaystyle NaOH$$

Solution

Caustic soda is sodium hydroxide which is a strong base and so it has high basicity value on $$pH$$ scale. It is widely used in acid-base titrations to neutralize various strong or weak acids like sulfuric acid.

Hence, the correct option is $$\text{D}$$
Question 4
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Calcium hydroxide (slaked lime) is used in :

A
plastics and dyes

B
fertilizers

C
antacids

D
white washing

Solution

Calcium hydroxide called slaked lime is an inorganic compound. It is a colorless crystal and is obtained when calcium oxide is mixed with water. It is used in preparation of dry mixer for painting and white washing.
Question 5
1 / -0

Observe the given flowchart carefully and mark the appropriate option correctly representing I, II, and III.

A
Sweet $$\quad$$ Calamine $$\quad$$ Formic acid

B
Bitter $$\quad$$ Formic acid $$\quad$$ Baking soda

C
Bitter $$\quad$$ Baking soda $$\quad$$ Calamine

D
Sweet $$\quad$$ Formic acid $$\quad$$ Baking soda

Solution

Acids are sour in taste and when ants bite they inject formic acid ($$\text{HCOOH}$$) into the victim. Hence $$II$$ is Formic acid.
This formic acid can be neutralized by a base. Baking soda is sodium bicarbonate which is alkaline in nature and can neutralize the formic acid. Hence $$III$$ is Baking soda.
It is bitter in taste ($$I$$).

Hence, option $$B$$ is correct.
Question 6
1 / -0

Wasp stings can be treated with:

A
baking soda

B
vinegar

C
washing soda

D
milk of magnesia

Solution

Wasp sting has basic venom. So an acid could be used to treat it. Vinegar $$(CH_3COOH)$$ is used to treat the wasp sting.

Hence, option B is correct.
Question 7
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To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

A
Acidic

B
Basic

C
Neutral

D
Corrosive

Solution

$$\textbf{Concept Applied:}$$ The neutralization reaction is the one in which an acid reacts with an equimolar amount of base to give salt and water.
$$NaOH+HCl\rightarrow NaCl+H_2O$$

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

$$\textbf{Explanation for correct option:}$$ Mouth has salivary amylase enzyme and the process of digestion starts from mouth making the acidic environment which causes the tooth decay so it is neutralized by using toothpaste basic in nature.

$$\textbf{Explanation for incorrect options:}$$ according to given concept toothpaste should be in basic nature so rest all other are wrong.
Question 8
1 / -0

Milk of magnesia $$Mg(OH)_2$$ is a/an:

A
acid

B
antacid

C
alkali

D
rock salt

Solution

Milk of Magnesia is a white suspension of hydrated magnesium carbonate in water, used as an antacid or laxative.
$$Mg(OH)_2$$ may be termed as an alkali but due to its low solubility in water it is considered as an atypical alkali.
Therefore antacid is the most appropriate answer.
Question 9
1 / -0

Sulphurous acid turns _________ litmus paper __________.

A
blue, red

B
red, blue

C
red, red

D
blue, blue

Solution

Sulphurous acid turns blue litmus red as it is the property of acids to turn blue litmus red.
Question 10
1 / -0

Which of the following base is used as antacid to neutralize stomach acidity?

A
$${ Mg(OH) }_{ 2 }$$

B
$$KOH$$

C
$${ Ca(OH) }_{ 2 }$$

D
$$NaOH$$

Solution

Magnesium hydroxide is also known as milk of magnesia and it is a common component of antacids and laxatives. It interferes with the absorption of folic acid and iron. It carries away much of the body's supply of potassium and neutralizes the stomach acid.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 10

Result

Acids Bases and Salts Test - 10

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SHARING IS CARING

Question 1

Hydrochloric acid

Slaked lime

Water

Salt

Solution

Question 2

Acid turns blue litmus red.

Base turns red litmus blue.

Both A and B correct

Water changes the colour of red litmus.

Solution

Question 3

$$\displaystyle { Mg\left( OH \right) }_{ 2 }$$

$$\displaystyle KOH$$

$$\displaystyle { Ca\left( OH \right) }_{ 2 }$$

$$\displaystyle NaOH$$

Solution

Question 4

plastics and dyes

fertilizers

antacids

white washing

Solution

Question 5

Sweet $$\quad$$ Calamine $$\quad$$ Formic acid

Bitter $$\quad$$ Formic acid $$\quad$$ Baking soda

Bitter $$\quad$$ Baking soda $$\quad$$ Calamine

Sweet $$\quad$$ Formic acid $$\quad$$ Baking soda

Solution

Question 6

baking soda

vinegar

washing soda

milk of magnesia

Solution

Question 7

Acidic

Basic

Neutral

Corrosive

Solution

Question 8

acid

antacid

alkali

rock salt

Solution

Question 9

blue, red

red, blue

red, red

blue, blue

Solution

Question 10

$${ Mg(OH) }_{ 2 }$$

$$KOH$$

$${ Ca(OH) }_{ 2 }$$

$$NaOH$$

Solution

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