Acids Bases and Salts Test

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Acids Bases and Salts Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

One of the following that does not inject an acidic liquid into the skin through its sting. This is

A
Honey bee

B
Ant

C
Wasp

D
Nettle leaf hair

Solution

Nettle leaf hair is a type of plant uprooted as weed. It has very fine thin hair which are painful to touch and sting badly but they do not inject any venom in human body instead they are rich source of vitamin C.
Question 2
1 / -0

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

A
Water

B
Ammonium hydroxide solution

C
Hydrochloric acid

D
None of these

Solution

Red litmus is turned to blue by the addition of base or alkali. To reverse this reaction, i.e. turning blue litmus to red, we need to add an acid like hydrochloric acid.

Water being neutral, and ammonium hydroxide solution being basic, will not reverse the change.
Question 3
1 / -0

Which of the following is a use of $$Al(OH)_3$$?

A
It is used in fire extinguisher as a foaming agent

B
It is used in the preparation of fertilizers

C
It is used in removing stains of grease from cloths

D
It is used as an antacid

Solution

$$Al(OH)_3$$ is used in fire extinguisher as a foaming agent.
Question 4
1 / -0

Solution of which of the following bases is used for whitewashing walls:

A
$$NaOH$$

B
$$KOH$$

C
$$NH_4OH$$

D
$$Ca(OH)_2$$

Solution

Calcium hydroxide reacts slowly with the carbon dioxide in the air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of whitewashing and gives a shiny finish to the walls.

$$Ca(OH)_2(aq) + CO_2(g)\longrightarrow CaCO_3(s) + H_2O(l)$$
Question 5
1 / -0

Which of the following is a use of sodium hydroxide?

A
It is used in the manufacture of soaps and paper.

B
It is used in the manufacture of synthetic fibers like rayon.

C
It is an important constituent of drain cleaners.

D
All of the above.

Solution

Sodium hydroxide is used in the manufacture of soaps, paper; in the manufacture of synthetic fibers like rayon and is important constituent in drain cleaners.

Hence option D is correct
Question 6
1 / -0

Which of the following base is preferred in the manufacture of soaps?

A
$$Ca(OH)_2$$

B
$$NaOH$$

C
$$Sr(OH)_2$$

D
$$Cs(OH)$$

Solution

Calcium hydroxide, strontium hydroxide, and cesium hydroxide are not preferred for soap making. But, sodium hydroxide causes saponification and, is the essential ingredient in soap making. So option B is the correct one.
Question 7
1 / -0

Toothpaste is _________ in nature.

A
acidic

B
basic

C
neutral

D
None of these

Solution

The $$pH$$ in our mouth is $$5.5$$ which is slightly acidic. If the $$pH$$ in our mouth decreases it results in tooth decay due to the formation of certain acids. Toothpaste is basic in nature which neutralizes the acid and protects from tooth decay.
Question 8
1 / -0

Which base is employed as the electrolyte in alkaline batteries?

A
$$NaOH$$

B
$$Al(OH)_3$$

C
$$FeOH$$

D
$$KOH$$

Solution

Aqueous potassium hydroxide is employed as the electrolyte in alkaline batteries based on nickel-cadmium, nickel-hydrogen, and manganese dioxide-zinc. Potassium hydroxide is preferred over sodium hydroxide because its solutions are more conductive.
Question 9
1 / -0

Which of the following base is used in the manufacturing of bleaching powder?

A
Sodium hydroxide

B
Calcium hydroxide

C
Magnesium oxide

D
Ammonium hydroxide

Solution

Bleaching powder is manufactured from calcium hydroxide.
Bleaching powder is $$CaOCl_2\cdot 2H_2O$$
$$2Ca(OH)_2+2Cl_{2}→Ca(OCl)_2+CaCl_{2}+2H_{2}O$$
Question 10
1 / -0

Which of the following base is used for cleaning and commonly known as lye?

A
$$Ca(OH)_2$$

B
$$NaOH$$

C
$$KOH$$

D
All of the above

Solution

A common base used for cleaning is sodium hydroxide, known commonly as lye or caustic soda. It is not to be taken internally, because it is highly damaging to humans tissue particularly the eyes. Lye appears in drain cleaners, such as Drano, and oven cleaners, such as Easy-Off, which make use of its ability to convert fats to water-soluble soap.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 11

Result

Acids Bases and Salts Test - 11

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SHARING IS CARING

Question 1

Honey bee

Ant

Wasp

Nettle leaf hair

Solution

Question 2

Water

Ammonium hydroxide solution

Hydrochloric acid

None of these

Solution

Question 3

It is used in fire extinguisher as a foaming agent

It is used in the preparation of fertilizers

It is used in removing stains of grease from cloths

It is used as an antacid

Solution

Question 4

$$NaOH$$

$$KOH$$

$$NH_4OH$$

$$Ca(OH)_2$$

Solution

Question 5

It is used in the manufacture of soaps and paper.

It is used in the manufacture of synthetic fibers like rayon.

It is an important constituent of drain cleaners.

All of the above.

Solution

Question 6

$$Ca(OH)_2$$

$$NaOH$$

$$Sr(OH)_2$$

$$Cs(OH)$$

Solution

Question 7

acidic

basic

neutral

None of these

Solution

Question 8

$$NaOH$$

$$Al(OH)_3$$

$$FeOH$$

$$KOH$$

Solution

Question 9

Sodium hydroxide

Calcium hydroxide

Magnesium oxide

Ammonium hydroxide

Solution

Question 10

$$Ca(OH)_2$$

$$NaOH$$

$$KOH$$

All of the above

Solution

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