Carbon and its Compounds Test

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Carbon and its Compounds Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

The functional group present in ethanol is:

A
Aldehydic group

B
Alcohol group

C
Ester group

D
Carboxyl group

Solution

The functional group present in ethanol (C₂H₅OH) is the alcohol group (-OH group). The hydroxyl group attached to a carbon atom is known as alcohol group.
Hence, the correct option is (B).
Question 2
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The odour of ethanoic acid resembles which one of the following:

A
Kerosene

B
Rose

C
Vinegar

D
Pungent

Solution

The odour of ethanoic acid (CH₃COOH) resembles vinegar. A dilute solution of ethanoic acid in water is called vinegar. Vinegar contains about 5 to 8 % ethanoic acid by volume.
Hence, the correct option is (C).
Question 3
1 / -0

Which of the following is used for antifreeze mixture?

A
HCHO

B
C₂H₅OH

C
CH₃COOH

D
CH₃COCH₃

Solution

Ethanol (C₂H₅OH) is used for antifreeze mixture. Antifreeze is an additive which lowers the freezing point of a water-based liquid. At room temperature, ethanol is a polar solvent and is used as antifreeze.
Hence, the correct option is (B).
Question 4
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Hydrocarbon with molecular formula C₄H₁₀has:

A
10 covalent bonds

B
13 covalent bonds

C
7 covalent bonds

D
6 covalent bonds

Solution

Butane C₄H₁₀ has 3 C-C covalent bonds and 10 C-H covalent bonds. Thus, it has 13 covalent bonds.

Covalent bonds: Bond form by the mutual sharing of electron is known as covalent bond.
Hence, the correct option is (B).
Question 5
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Sodium stearate is chemically:

A
Baking soda

B
Bleaching powder

C
Detergent

D
Soap

Solution

Sodium stearate (C₁₇H₃₅COONa) is chemically a sodium salt of stearic acid (C₁₇H₃₅COOH). Stearic acid (IUPAC name - Octadecanoic acid) is a saturated fatty acid with an 18-carbon chain. Soaps are sodium or potassium salts of long chain fatty acids.
Hence, the correct option is (D).
Question 6
1 / -0

Which of the following ingredients are not used in making soap?

A
Cotton seed oil, KOH

B
Castor oil, NaOH

C
Mustard oil, NaOH

D
Soyabean oil, Ca(OH)₂

Solution

Soap is made by heating animal oil or vegetable oil with concentrated sodium hydroxide solution. Castor oil and NaOH are the ingredients for making soap. Similarly, cotton seed oil and KOH, and mustard oil and NaOH are also the ingredients for making soap.
Hence, the correct option is (D).
Question 7
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The next homologue of C₅H₁₁COOH is :

A
C₇H₁₅COOH

B
C₆H₁₃COOH

C
C₄H₉COOH

D
None of these

Solution

The next homologue of C₅H₁₁COOH (Pentanoic acid) is C₆H₁₃COOH (Hexanoic acid). Two adjacent homologues in a series differ by 1 carbon atom and 2 hydrogen atoms i.e. by a CH₂ group.
Homologous series is a series of compounds with similar chemical properties and same functional group differing from the successive member by $CH _{2}$ . Carbon chains of varying length have been observed in organic compounds having the same general formula.
Hence, the correct option is (B).
Question 8
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Hardness of water is caused by:

A
CaSO₄

B
Mg(HCO₃)₂

C
CaCl₂

D
All of these

Solution

Hardness of water is caused by magnesium and calcium salts. Calcium and magnesium dissolved in water are the two most common minerals that make water hard. Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate).
Hence, the correct option is (D).
Question 9
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Which among the following is a cleaner fuel?

A
CH₃OH

B
C₂H₅OH

C
C₃H₇OH

D
C₆H₁₂O₂₂

Solution

Ethanol as fuel is a cleaner source of fuelling our vehicles compared to conventional fuels like petrol and diesel. Ethanol produced from sugarcane and other resources is being considered globally as one of the most prominent and possible substitutes for fossil fuel.
Hence, the correct option is (B).
Question 10
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Butanone is a four carbon compound with the functional group:

A
- OH

B
- CHO

C
- CO -

D
- COOH

Solution

Butanone (CH₃COCH₂CH₃) is the second member of ketones. It is a four carbon compound with ketone functional group (- CO -). The ketone functional group has two free valencies which are satisfied by one methyl ( -CH₃ ) group and one ethyl ( -C₂H₅ ) group.
Hence, the correct option is (C).
Question 11
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Which one of the following is not in liquid state at 10^oC ?

A
C₂H₅OH

B
Glacial acetic acid

C
Acetone

D
H₂O

Solution

Freezing point of pure ethanoic acid is 16.6 °C (61.9 °F). Freezing point of pure water is 0 °C. Freezing point of pure ethyl alcohol (C₂H₅OH) is -114.1 °C. Freezing point of pure acetone is -95 °C. When ethanoic acid (acetic acid) is cooled below 10 °C, it freezes to form a colourless, ice-like solid. The solid looks like glacier and hence pure ethanoic acid is called glacial ethanoic acid (or glacial acetic acid).
Hence, the correct option is (B).
Question 12
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How many structural isomers are possible for pentane?

A
2

B
4

C
3

D
1

Solution

3 structural isomers are possible for pentane (C₅H₁₂). These are n-pentane, iso-pentane and neo-pentane.
Structural isomers of pentane are as follow:

Structural isomers are isomers that have the same component atoms but they are arranged differently from each other.
Hence, the correct option is (C).
Question 13
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Reduction is the process of:

A
Removal of oxygen

B
Addition of hydrogen

C
Both removal of oxygen and addition of hydrogen.

D
Addition of oxygen

Solution

It is referred to as the loss of oxygen when it is with respect to the oxygen transfer. It is the job of the reducing agent to remove the oxygen from another substance. Similarly, in the case of hydrogen transfer, it is the gain of hydrogen.
That means it is reducing agent's work to remove oxygen from one substance and hydrogen to it.
Hence, the correct option is (C).
Question 14
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Which of the following substances produce hydrogen on reacting with metals?

A
H₂SO₄

B
Water (H₂O)

C
C₂H₅OH

D
All of these

Solution

All of these produce hydrogen on reacting with metals.
Metal + Water $\to$ Metal hydroxide + Hydrogen;
Metal + Steam $\to$ Metal oxide + Hydrogen
(only those metals displace hydrogen from water (or steam) which are above hydrogen in the reactivity series.
Metal + Acid $\to$ Metal salt + Hydrogen;
2C₂H₅OH + Na $\to$ 2C₂H₅ONa + H₂ (This reaction is used as a test for ethanol)
Hence, the correct option is (D).
Question 15
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Which end of soap dissolves in water?

A
Non-polar end

B
Ionic end

C
Polar end

D
Both ionic end and polar end

Solution

A soap molecule is said to have a tadpole structure. It consists of 2 parts - a long hydrocarbon chain which is water-repellent (hydrophobic) and an ionic part which is water-attracting (hydrophillic) due to the polar nature of water molecules.
Hence, the correct option is (D).

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Re-Attempt Weekly Quiz Competition

Carbon and its Compounds Test - 12

Result

Carbon and its Compounds Test - 12

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SHARING IS CARING

Question 1

Aldehydic group

Alcohol group

Ester group

Carboxyl group

Solution

Question 2

Kerosene

Rose

Vinegar

Pungent

Solution

Question 3

HCHO

C2H5OH

CH3COOH

CH3COCH3

Solution

Question 4

10 covalent bonds

13 covalent bonds

7 covalent bonds

6 covalent bonds

Solution

Question 5

Baking soda

Bleaching powder

Detergent

Soap

Solution

Question 6

Cotton seed oil, KOH

Castor oil, NaOH

Mustard oil, NaOH

Soyabean oil, Ca(OH)2

Solution

Question 7

C7H15COOH

C6H13COOH

C4H9COOH

None of these

Solution

Question 8

CaSO4

Mg(HCO3)2

CaCl2

All of these

Solution

Question 9

CH3OH

C2H5OH

C3H7OH

C6H12O22

Solution

Question 10

- OH

- CHO

- CO -

- COOH

Solution

Question 11

C2H5OH

Glacial acetic acid

Acetone

H2O

Solution

Question 12

2

4

3

1

Solution

C₂H₅OH

CH₃COOH

CH₃COCH₃

Soyabean oil, Ca(OH)₂

C₇H₁₅COOH

C₆H₁₃COOH

C₄H₉COOH

CaSO₄

Mg(HCO₃)₂

CaCl₂

CH₃OH

C₂H₅OH

C₃H₇OH

C₆H₁₂O₂₂

C₂H₅OH

H₂O

H₂SO₄

Water (H₂O)

C₂H₅OH