Acids Bases and Salts Test

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Acids Bases and Salts Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

A
Basic

B
Either acidic or basic

C
Either acidic or neutral

D
Either basic or neutral

Solution

With acidic/neutral solutions, colour of phenolphthalein indicator will not change.
Question 2
1 / -0

The correct way of making a solution of acid in water is to:

A
add water to acid

B
add acid to water

C
mix acid and water simultaneously

D
add water to acid in a shallow container

Solution

$$\textbf{Concept Applied:}$$ Mixing acid and water together is an exothermic process.

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

$$\textbf{Explanation for correct option:}$$ When we add water to acid, it releases heat. Sometimes, released heat is too large, because of this glasses of test tube may break down and acid can spill over. So, in practice, you have to take an excessive amount of water in a large container and mix acid drop by drop. In this way, heat generated can be cooled down by this water and danger can be prevented.

$$\textbf{Explanation for incorrect options:}$$
(A) Adding water to acid may cause water to splutter. The hot water can cause burns.
(C) Mixing both acid and water simultaneously will result in spluttering of water or acid that can cause burns.
(D) Shallow container may result in breakage of the container. Also, adding water to acid is not the right approach.

TRICK TO REMEMBER:
Acid (harmful) is like Pakistan army
Water (life saver) is like Indian army
To defeat Pakistani army, Indian army should be in bigger numbers.
Same way water should be in larger quantity and acid should be added in smaller quantities.
Question 3
1 / -0

Metals generally react with dilute acids to produce hydrogen gas . Which one of the following metals does not react with dilute hydrochloric acid?

A
magnesium

B
iron

C
aluminium

D
copper

Solution

Less reactive metals such as silver, copper, gold etc don't react with dilute hydrochloric acid. So, these metals do not produce hydrogen gas.
Hence, option "D" is correct answer.
Question 4
1 / -0

Which of the following statements is not correct?

A
All metal carbonates react with acid to give a salt, water and carbon dioxide

B
All metal oxides react with water to give salt and acid

C
Some metals react with acids to give salt and hydrogen

D
Some non-metal oxides react with water to form an acid

Solution

Metal oxides are basic in nature. They give alkaline solution when dissolved in water.
Question 5
1 / -0

Formula of caustic soda is:

A
$$KOH$$

B
$$NaHCO_{3}$$

C
$$NaCl$$

D
$$NaOH$$

Solution

Sodium hydroxide, also known as caustic soda, is a compound with the formula $$NaOH$$. It is a white solid ionic compound consisting of sodium cations $$Na^{+}$$ and hydroxide anions $$OH^{-}$$.
Hence option $$D$$ is correct.
Question 6
1 / -0

Which gas is produced by reaction of base with metal?

A
Carbon dioxide

B
Dioxygen

C
Dihydrogen

D
Dinitrogen

Solution

A strong base reacts with some metals to form salt and releases dihydrogen gas.
Question 7
1 / -0

Which of the following solutions is the most basic?

A
$$pH=8.2$$

B
$$pH=9.3$$

C
$$pH=11.5$$

D
$$pH=10.6$$

Solution

$$pH$$ of a basic solution ranges from more than 7 to 14. More the basicity, more the $$pH.$$
Question 8
1 / -0

Why curd and other sour substances should not be stored in brass and copper vessels?

A
Curd and sour substances contain bases

B
Curd and sour substances contain acids

C
Both A and B

D
None of A or B

Solution

Curd and sour substances contain acids. These acids react with the metals in brass and copper vessels to produce salt and hydrogen gas. This will corrode the metal and result in the spoilage of food.

Therefore, option $$B$$ is correct.
Question 9
1 / -0

Equal volumes of solutions containing 1 mole of an acid and 1 mole of a base respectively are mixed. Which of these mixture will give pH more than $$7$$?

A
Sodium hydroxide + Acetic acid

B
Potassium hydroxide + Sulphuric acid

C
Ammonium hydroxide + Sulphuric acid

D
Sodium hydroxide + Hydrochloric acid

Solution

When acid and base react with each other they form salt and water, this type of reaction is known as neutralization reaction. In such reactions when a strong acid and a strong base react with each other, they form a neutral solution which means the solution has $$pH$$ equal to $$7$$.
When there is a reaction between equal moles of strong acid and weak base, resultant solutions have $$pH$$ lower than $$7$$ (acidic solution), and when there is a reaction between equal moles of a weak acid and strong base resultant solution have $$pH$$ more than $$7$$ (basic solution).

From the given option only option $$A$$ has a combination of a strong base and a weak acid, hence this solution has $$pH$$ more than $$7$$
Option $$A$$ is correct.
Question 10
1 / -0

Hydrogen ions in $$HCl$$ are produced in the presence of?

A
Carbon dioxide

B
Oxygen

C
Water

D
None of the above

Solution

$$\textbf{Concept Applied:}$$ HCl in actual is a covalent type compound and in solid form it comes under molecular solids. In solution form(when dissolved in water)…it easily dissociates into H+ and Cl- ions and act as Acid. In the case of dry HCl, it doesn't dissociate to give H+ and exists as a covalent compound…so it's not acidic.
$$\textbf{Correct Option:}$$ C
$$\textbf{Explanation for correct option:}$$
Hydrogen ions in $$HCl$$ are produced in the presence of water as the separation of $$H^+$$ ion from $$HCl$$ molecules cannot occur in the absence of water, thus option $$C$$ is correct.

$$HCl + H_2O \rightarrow H_3O^+ + Cl^–$$
$$\textbf{Explanation for incorrect options:}$$ both option A and B not act as a poler solvent both are non-poler molecule so in this HCl cannot show acidic nature

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Acids Bases and Salts Test - 40

Result

Acids Bases and Salts Test - 40

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SHARING IS CARING

Question 1

Basic

Either acidic or basic

Either acidic or neutral

Either basic or neutral

Solution

Question 2

add water to acid

add acid to water

mix acid and water simultaneously

add water to acid in a shallow container

Solution

Question 3

magnesium

iron

aluminium

copper

Solution

Question 4

All metal carbonates react with acid to give a salt, water and carbon dioxide

All metal oxides react with water to give salt and acid

Some metals react with acids to give salt and hydrogen

Some non-metal oxides react with water to form an acid

Solution

Question 5

$$KOH$$

$$NaHCO_{3}$$

$$NaCl$$

$$NaOH$$

Solution

Question 6

Carbon dioxide

Dioxygen

Dihydrogen

Dinitrogen

Solution

Question 7

$$pH=8.2$$

$$pH=9.3$$

$$pH=11.5$$

$$pH=10.6$$

Solution

Question 8

Curd and sour substances contain bases

Curd and sour substances contain acids

Both A and B

None of A or B

Solution

Question 9

Sodium hydroxide + Acetic acid

Potassium hydroxide + Sulphuric acid

Ammonium hydroxide + Sulphuric acid

Sodium hydroxide + Hydrochloric acid

Solution

Question 10

Carbon dioxide

Oxygen

Water

None of the above

Solution

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