Acids Bases and Salts Test

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Acids Bases and Salts Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

A farmer treats the soil of his field with lime when the soil has:

A
acidic nature

B
basic nature

C
neutral nature

D
None of the above

Solution

Lime is calcium hydroxide and it is alkaline in nature. It is used to treat acidic soils as it neutralizes the acidity of the soils. These acidic soils have sulfate, chloride, or phosphate groups which can be neutralized by the alkaline nature of lime.
Hence, the correct option is A.
Question 2
1 / -0

The $$pH$$ of an acidic solution is:

A
$$< 7$$

B
$$>7$$

C
$$=7$$

D
None of the above

Solution

On a given $$pH$$ scale $$0\:to\:7$$ the acidity of the solution is measured and this acidic strength is always less than $$ 7$$ for any acid. This acidity increases on going down the scale from $$7 \:to\:0$$.
And, pH=7 for neutral/salt
pH>7 is for base/alkali.

Option A is correct.
Question 3
1 / -0

$$pH$$ scale:

A
ranges from $$0-5$$

B
ranges from $$0-7$$

C
ranges from $$0-14$$

D
none of these

Solution

$$pH$$ scale ranges from $$0-14$$
$$pH<7$$ Acidic compound
$$pH=7$$ Neutral
$$pH>7$$ Base
Question 4
1 / -0

To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is:

A
acidic

B
neutral

C
basic

D
corrosive

Solution

Correct answer: Option $$C$$

Hint: Toothpaste contains calcium carbonate.

Explanation:
Decay of teeth starts when $$pH$$ of mouth is below $$5.5$$.
Toothpaste contains basic $$CaCO_3$$, which keeps the $$pH$$ of our mouth high, which prevents the growth of bacteria that thrive in an acidic medium.
Also, it prevents tooth decay by protecting the $$(Ca)_3(PO_4)_2$$ which would dissociate into hydrogen phosphate in an acidic medium,
Question 5
1 / -0

Which of the following statement is correct about an aqueous solution of an acid and a base?
(i) Higher the pH, stronger the acid.
(ii) Higher the pH, weaker the acid.
(iii) Lower the pH, stronger the base.
(iv) Lower the pH, weaker the base.

A
(i) and (iii)

B
(ii) and (iii)

C
(i) and (iv)

D
(ii) and (iv)

Solution

On a pH scale, acidity ranges from 1 to 7 and it increases by moving down from 7 to 1 while basicity ranges from 7 to 14 which increases by moving up from 7 to 14.

So, the higher the pH value, the weak is the acid while the higher the pH value for a base means a stronger base.
Question 6
1 / -0

Match the following columns.
Column (I) Column(II)
(1) Plaster of Paris (i) Ca(OH)$$_2$$
(2) Gypsum (ii) CaSO$$_4$$.$$ \dfrac {1}{2}$$H$$_2$$O
(3) Bleaching powder (iii) CaSO$$_4$$.2H$$_2$$O
(4) Slaked lime (iv) CaOCl$$_2$$

A
(1) $$\rightarrow$$ (ii), (2) $$\rightarrow$$ (iii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (i)

B
(1) $$\rightarrow$$ (iii), (2) $$\rightarrow$$ (ii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (i)

C
(1) $$\rightarrow$$ (i), (2) $$\rightarrow$$ (iii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (ii)

D
(1) $$\rightarrow$$ (iii), (2) $$\rightarrow$$ (iii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (i)

Solution

1) Plaster of Paris is $${ CaSO }_{ 4 }\cdot \dfrac { 1 }{ 2 } { H }_{ 2 }O$$. It is calcium sulphate and it differs from gypsum only with water of crystallization.
2) Gypsum is formed if plaster of paris absorbs moisture becomes a hard material.
$${ CaSO }_{ 4 }\cdot 2{ H }_{ 2 }O$$
3) Bleaching powder is calcium oxychloride which is used for bleaching purposes.
4) Slaked lime is known as calcium hydroxide.
Question 7
1 / -0

You have two solutions, $$A$$ and $$B$$. The $$pH$$ of solution $$A$$ is $$6$$ and $$pH$$ of solution $$B$$ is $$8$$. Which solution has more hydrogen ion concentration? Which of this acidic and which one is basic?

A
A $$pH$$ value less then $$7$$ indicates an acidic solution, while greater than $$7$$ indicates a basic solution. Therefore, the solution with $$pH = 6$$ is acidic and has more hydrogen ion concentration than the solution of $$pH = 8$$ which is basic.

B
A $$pH$$ value less then $$7$$ indicates an basic solution, while greater than $$7$$ indicates a acidic solution. Therefore, the solution with $$pH = 8$$ is acidic and has more hydrogen ion concentration than the solution of $$pH = 6$$ which is basic.

C
A $$pH$$ value less then $$7$$ indicates an acidic solution, while greater than $$7$$ indicates a basic solution. Therefore, the solution with $$pH = 8$$ is acidic and has more hydrogen ion concentration than the solution of $$pH = 6$$ which is basic.

D
None of the above
Question 8
1 / -0

Chemically baking soda is:

A
$${Ca(OH)_2}$$

B
$${NaHCO_3}$$

C
$${Na_2CO_3}$$

D
$$CaO$$

Solution

Chemically baking soda is $$NaHCO_3$$ (Sodium Hydrogen carbonate). It is a salt composed of a sodium cation and a bicarbonate anion. Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.
Question 9
1 / -0

Baking soda is used as _________ as it is __________.

A
an antacid, a base

B
disinfectant, anti-germs

C
oxidising agent, a bleach

D
a soap, a base
Question 10
1 / -0

Acid reacts with metal to form:

A
salt + $$CO_2$$

B
salt + water

C
salt + $$O_2$$

D
salt + $$H_2$$

Solution

When an acid reacts with a metal, metal salt and hydrogen are formed. However, this depends if the metal is reactive or not.
For example- magnesium $(Mg)$$, is a reactive metal to hydrochloric acid. Therefore, making magnesium chloride and hydrogen:

$$Mg + 2HCl \longrightarrow MgCl_2 + H_2$$

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Column (I)	Column(II)
(1) Plaster of Paris	(i) Ca(OH)$$_2$$
(2) Gypsum	(ii) CaSO$$_4$$.$$ \dfrac {1}{2}$$H$$_2$$O
(3) Bleaching powder	(iii) CaSO$$_4$$.2H$$_2$$O
(4) Slaked lime	(iv) CaOCl$$_2$$

Acids Bases and Salts Test - 29

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Acids Bases and Salts Test - 29

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Question 1

acidic nature

basic nature

neutral nature

None of the above

Solution

Question 2

$$< 7$$

$$>7$$

$$=7$$

None of the above

Solution

Question 3

ranges from $$0-5$$

ranges from $$0-7$$

ranges from $$0-14$$

none of these

Solution

Question 4

acidic

neutral

basic

corrosive

Solution

Question 5

(i) and (iii)

(ii) and (iii)

(i) and (iv)

(ii) and (iv)

Solution

Question 6

(1) $$\rightarrow$$ (ii), (2) $$\rightarrow$$ (iii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (i)

(1) $$\rightarrow$$ (iii), (2) $$\rightarrow$$ (ii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (i)

(1) $$\rightarrow$$ (i), (2) $$\rightarrow$$ (iii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (ii)

(1) $$\rightarrow$$ (iii), (2) $$\rightarrow$$ (iii), (3) $$\rightarrow$$ (iv), (4) $$\rightarrow$$ (i)

Solution

Question 7

A $$pH$$ value less then $$7$$ indicates an acidic solution, while greater than $$7$$ indicates a basic solution. Therefore, the solution with $$pH = 6$$ is acidic and has more hydrogen ion concentration than the solution of $$pH = 8$$ which is basic.

A $$pH$$ value less then $$7$$ indicates an basic solution, while greater than $$7$$ indicates a acidic solution. Therefore, the solution with $$pH = 8$$ is acidic and has more hydrogen ion concentration than the solution of $$pH = 6$$ which is basic.

A $$pH$$ value less then $$7$$ indicates an acidic solution, while greater than $$7$$ indicates a basic solution. Therefore, the solution with $$pH = 8$$ is acidic and has more hydrogen ion concentration than the solution of $$pH = 6$$ which is basic.

None of the above

Question 8

$${Ca(OH)_2}$$

$${NaHCO_3}$$

$${Na_2CO_3}$$

$$CaO$$

Solution

Question 9

an antacid, a base

disinfectant, anti-germs

oxidising agent, a bleach

a soap, a base

Question 10

salt + $$CO_2$$

salt + water

salt + $$O_2$$

salt + $$H_2$$

Solution

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