Acids Bases and Salts Test

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Acids Bases and Salts Test - 33

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Question 1
1 / -0

The reaction between an acid and a base to give a salt and water is known as:

A
displacement reaction

B
neutralisation reaction

C
decomposition reaction

D
double displacement reaction

Solution

The reaction between an acid and a base to give a salt and water is known as a neutralisation reaction.
Example: $$HCl(aq) + NaOH (aq) \rightarrow NaCl (aq) + H_{2}O(l)$$
Question 2
1 / -0

$$H_{2}SO_{4} (aq) + 2 NaOH(aq)\rightarrow$$

A
$$Na_{2}SO_{4} (aq) + 2H_{2}O(l)$$

B
$$2Na_{2}SO_{4} (aq) + H_{2}O(l)$$

C
$$3Na_{2}SO_{4} (aq) + H_{2}O(l)$$

D
$$Na_{2}SO_{4} (aq) + 3H_{2}O(l)$$

Solution

$$H_2SO_4 (aq)+2NaOH (aq)\longrightarrow Na_2SO_4 (aq)+2H_2O (l)$$
It is a simple neutralization reaction.
Acid $$+$$ Base $$\longrightarrow$$ Salt $$+$$ Water
Double displacement
Question 3
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'The blue-green colour of the solution is due to the formation of copper(II) chloride in the reaction' is an example of which kind of chemical reaction?

A
Reaction of metallic oxides with acids

B
Reaction of non-metallic oxides with acids

C
Reaction of metallic oxides with bases

D
Reaction of non-metallic oxides with base

Solution

Metal oxides always reacts with acid to form salt and water. Copper oxide when reacts with $$HCl$$ it forms blue-green copper(II) chloride.
$$2CuO + 2HCl \rightarrow 2CuCl_2 + H_2O$$
Question 4
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Complete the reaction:
$$HCl + NaOH \rightarrow $$

A
$$NaCl + H_{2}O$$

B
$$NaCl + H + OH$$

C
$$NaCl + H_{2}$$

D
$$Na + Cl + H_{2}O$$

Solution

When hydrochloric acid $$(HCl)$$ and sodium hydroxide $$(NaOH)$$ react with each other, neutralization reaction takes place and there is the formation of salt (sodium chloride $$NaCl$$) and water.

The acid releases hydrogen ion $$H^+$$ which combines with the hydroxyl ion $$(OH^{-})$$ released by the base, to form water. The anion of the acid and cation of the base combine together to form the salt.

$$HCl+NaOH \rightarrow NaCl+H_2O$$

Thus, the answer correct is an option (A).
Question 5
1 / -0

Metal carbonates react with _______ to give salt, carbon dioxide and water.

A
acids

B
bases

C
metals

D
non-metals

Solution

$$\bf{Hint-}$$
Study the reaction of metal carbonates with acids.

$$\bf{Concept-}$$
All metal carbonates and hydrogen carbonates are weak bases. So, when an acid reacts with a base, ionic compounds are the main product of the reaction.

$$\bf{Correct\ option-}$$
Option A is correct.

$$\bf{Explanation-}$$
Metal carbonates react with acids to give salt, carbon dioxide, and water.
Example:
$$Na_2CO_{3} (s) + 2HCl (aq) \rightarrow 2NaCl (aq) + H_{2}O (l) + CO_2 (g)$$.
Question 6
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When an acid reacts with the metal carbonate will form bubbles giving off carbon dioxide gas and the other products namely :

A
salt and water

B
water and heat

C
salt and base

D
base and heat

Solution

Metal carbonates and metal bicarbonates are a type of base and when they react with acid, a neutralization reaction takes place leading to the formation of salt and water.
For example: When hydrochloric acid reacts with sodium carbonate forms sodium chloride, carbon dioxide, and water. It can be shown by the reaction as below.
$$Na_2CO_{3} + 2HCl \longrightarrow 2NaCl + CO_2 \uparrow + H_2O$$
During this reaction carbon dioxide is formed which causes bubbling or effervescence in the solution.
Therefore, when the metal carbonate reacts with acids, salt and water will be formed, along with bubbling in the solution due to the formation of carbon dioxide.
Hence, the correct answer is an option $$(A)$$.
Question 7
1 / -0

Match the following
Natural source Acid
1. Sour milk (Curd) a. Lactic acid
2. Lemon b. Citric acid
3. Ant sting c. Methanoic acid

A
1-a, 2-b, 3-c

B
1-a, 2-c, 3-b

C
1-c, 2-b, 3-a

D
1-b, 2-a, 3-c

Solution

Sour milk is cultured with lactic acid bacteria (for eg. Lactobacillus) that use lactose to produce mainly lactic acid. Thus sour milk has lactic acid in it.
Citrus fruits (for eg. lemon) have citric acid in them which makes them taste sour and along with that it also has Vitamin C and ascorbic acid.
Ant sting has formic acid (methanoic acid) due to which we have burning and itching sensation.
Hence, correct answer is option A.
Question 8
1 / -0

Why does survival of aquatic life becomes difficult because of acid rain?

A
When acid rain falls into the river, it lowers the pH of the river water.

B
When acid rain falls into the river, it increases the pH of the river water.

C
Acid rain does not cause any change in the river water.

D
None of the above

Solution

The pH range of acid rain usually lies between 4.4 - 4.2
When acid rain falls in the river, it lowers the pH of the river water. Living organisms can only survive in a narrow range of pH. This lowering of pH makes the survival of living organisms in aquatic habitats difficult.
Hence, the correct answer is an option (A).
Question 9
1 / -0

The product of the following reaction is:
$$2HCl{(aq)} + MgCO_{3}(s)\rightarrow$$

A
$$MgCl_{2}(aq) + CO_{2}(g) + H_{2}O(l)$$

B
$$MgCl_{2}(aq) + CO_{2}(g)$$

C
$$MgCl_{2}(aq) + H_{2}O(l)$$

D
$$MgCl_{2}(s) + CO_{2}(l) + H_{2}O(l)$$

Solution

$$(A)$$ $$MgCl_{2}(aq)$$ + $$CO_{2}(g)$$ + $$H_{2}O(l)$$

$$Reaction$$ : $$2HCl(aq)$$ + $$MgCO_{3}(s)$$ $$\rightarrow$$ $$MgCl_{2}(aq)$$ + $$CO_{2}(g)$$ + $$H_{2}O(l)$$

Option $$A$$ is correct.
Question 10
1 / -0

Which part of the tooth, made up of a crystalline form of calcium phosphate, is the hardest substance in the body?

A
Root

B
Body

C
Enamel

D
All

Solution

The enamel on the teeth is the hardest and highly mineralized substance in the body. It covers the outer layer of each tooth and is the most visible part of the tooth. Enamel is made up of hydroxyapatite which is crystalline calcium phosphate.

Hence, the correct answer is option (C).

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Natural source	Acid
1. Sour milk (Curd)	a. Lactic acid
2. Lemon	b. Citric acid
3. Ant sting	c. Methanoic acid

Acids Bases and Salts Test - 33

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Acids Bases and Salts Test - 33

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Question 1

displacement reaction

neutralisation reaction

decomposition reaction

double displacement reaction

Solution

Question 2

$$Na_{2}SO_{4} (aq) + 2H_{2}O(l)$$

$$2Na_{2}SO_{4} (aq) + H_{2}O(l)$$

$$3Na_{2}SO_{4} (aq) + H_{2}O(l)$$

$$Na_{2}SO_{4} (aq) + 3H_{2}O(l)$$

Solution

Question 3

Reaction of metallic oxides with acids

Reaction of non-metallic oxides with acids

Reaction of metallic oxides with bases

Reaction of non-metallic oxides with base

Solution

Question 4

$$NaCl + H_{2}O$$

$$NaCl + H + OH$$

$$NaCl + H_{2}$$

$$Na + Cl + H_{2}O$$

Solution

Question 5

acids

bases

metals

non-metals

Solution

Question 6

salt and water

water and heat

salt and base

base and heat

Solution

Question 7

1-a, 2-b, 3-c

1-a, 2-c, 3-b

1-c, 2-b, 3-a

1-b, 2-a, 3-c

Solution

Question 8

When acid rain falls into the river, it lowers the pH of the river water.

When acid rain falls into the river, it increases the pH of the river water.

Acid rain does not cause any change in the river water.

None of the above

Solution

Question 9

$$MgCl_{2}(aq) + CO_{2}(g) + H_{2}O(l)$$

$$MgCl_{2}(aq) + CO_{2}(g)$$

$$MgCl_{2}(aq) + H_{2}O(l)$$

$$MgCl_{2}(s) + CO_{2}(l) + H_{2}O(l)$$

Solution

Question 10

Root

Body

Enamel

All

Solution

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