Carbon and its Compounds Test

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Carbon and its Compounds Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

When acetic acid reacts with ethyl alcohol, we add conc. H₂SO₄. It acts as _____________ and the process is called _____________.

A
Oxidizing agent, Saponification

B
Acid, Esterification

C
Reducing agent, Esterification

D
Dehydrating agent, Esterification

Solution

The reaction in which a carboxylic acid combines with an alcohol to form an ester is called esterification. When acetic acid reacts with ethyl alcohol, an ester is formed along with water. Esterification is a reversible reaction. Concentrated sulphuric acid acts as a dehydrating agent and absorbs water from the product mixture so that the reaction proceeds in the forward direction. CH₃COOH + C₂H₅OH --> CH₃COOC₂H₅ + H₂O
Question 2
1 / -0

Acetic acid, when dissolved in water, dissociates into ions reversibly because it is:

A
A weak acid

B
Weak base

C
Strong acid

D
Strong base

Solution

Acetic acid is a weak acid (an organic acid). It does not ionise completely when dissolved in water.
Question 3
1 / -0

Statement A: Detergent with less branching in the molecule is degraded more easily than branched chain detergents.

Statement B: Soaps are 100% biodegradable.

A
Statement A is true; Statement B is false.

B
Statement B is true; Statement A is false.

C
Both the statements A and B are true.

D
Neither statement A nor statement B is true.

Solution

All soaps are biodegradable i.e. they can be decomposed by micro-organsims like the bacteria. Branched chain synthetic detergents are far less degradable than unbranched detergents.
Question 4
1 / -0

Activated charcoal is used in sugar industry as a:

A
Reducing agent

B
Oxidizing agent

C
Dehydrating agent

D
Decolorizing agent

Solution

Activated charcoal is activated carbon. It is a form of carbon processed to have small, low-volume pores that increases the surface area available for adsorption or chemical reactions. Activated charcoal is used as a decolorizing agent in the sugar industry.
Question 5
1 / -0

C₆₀and C₇₀ are important members of which type of allotrope of carbon?

A
Diamond

B
Graphite

C
Coal

D
Fullerenes

Solution

Carbon can exist in three solid forms (Diamond, Graphite, Fullerenes) called allotropes. C₆₀and C₇₀ are members of Fullerenes (Allotropes of carbon). Buckminsterfullerene contains cluster of 60 carbon atoms joined together to form spherical molecules.
Question 6
1 / -0

Statement A: Solubility of alcohols in water goes on increasing with increasing molecular weight.

Statement B: Boiling point of alcohols goes on increasing with increasing molecular weight.

A
Statement A is true; Statement B is false.

B
Statement B is true; Statement A is false.

C
Both the statements A and B are true

D
Neither statement A nor statement B is true.

Solution

Solubility of alcohols in water decreases with increasing molecular weight. The first three alcohols (methanol, ethanol and propanol) are completely miscible. Each alcohol consists of a carbon chain (always non-polar) and a OH group (which is polar). The solubility of alcohols starts to decrease with butanol. Alcohols are considered immiscible after heptanol.

Boiling point of alcohols increases with increasing molecular weight. The boiling point of alcohols increases as the length of the hydrocarbon chain increases.
Question 7
1 / -0

Find the incorrect statement about soaps.

A
C₁₇H₃₁COONa is a soap.

B
Soaps are acidic in nature.

C
Fat is hydrolysed with NaOH to get soap.

D
(C₁₇H₃₁COO)₂Ca is the scum produced when the soap reacts with ions present in hard water.

Solution

Soaps are basic in nature. Soaps are sodium or potassium salts of long chain fatty acids. When triglycerides in fat/oil react with aqueous NaOH or KOH, they are converted into soap and glycerol. This is called alkaline hydrolysis of esters. E.g. C₁₇H₃₁COONa (Sodium stearate) is a soap. Scum is produced when the soap reacts with calcium and/or magnesium ions present in hard water.
Question 8
1 / -0

Statement A: Oxyacetylene flame is used for welding purposes.

Statement B: Ethyne reacts with HCl in the presence of HgCl₂ to form vinyl chloride.

A
Statement A is true; Statement B is false.

B
Statement B is true; Statement A is false.

C
Both the statements A and B are true.

D
Neither statement A nor statement B is true.

Solution

Oxyacetylene flame is used for welding purposes. The oxyacetylene welding process uses a combination of oxygen and acetylene (C₂H₂) gas to provide a high temperature flame. It is commonly used to join mild steel permanently.

Ethyne (C₂H₂) reacts with HCl in the presence of HgCl₂Hg to from vinyl chloride or chloro ethane H₂C = CHCl. This colorless compound is an important industrial chemical. It is chiefly used to produce polyvinyl chloride (PVC).

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Re-Attempt Weekly Quiz Competition

Carbon and its Compounds Test - 9

Result

Carbon and its Compounds Test - 9

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SHARING IS CARING

Question 1

Oxidizing agent, Saponification

Acid, Esterification

Reducing agent, Esterification

Dehydrating agent, Esterification

Solution

Question 2

A weak acid

Weak base

Strong acid

Strong base

Solution

Question 3

Statement A is true; Statement B is false.

Statement B is true; Statement A is false.

Both the statements A and B are true.

Neither statement A nor statement B is true.

Solution

Question 4

Reducing agent

Oxidizing agent

Dehydrating agent

Decolorizing agent

Solution

Question 5

Diamond

Graphite

Coal

Fullerenes

Solution

Question 6

Statement A is true; Statement B is false.

Statement B is true; Statement A is false.

Both the statements A and B are true

Neither statement A nor statement B is true.

Solution

Question 7

C17H31COONa is a soap.

Soaps are acidic in nature.

Fat is hydrolysed with NaOH to get soap.

(C17H31COO)2Ca is the scum produced when the soap reacts with ions present in hard water.

Solution

Question 8

Statement A is true; Statement B is false.

Statement B is true; Statement A is false.

Both the statements A and B are true.

Neither statement A nor statement B is true.

Solution

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C₁₇H₃₁COONa is a soap.

(C₁₇H₃₁COO)₂Ca is the scum produced when the soap reacts with ions present in hard water.