Carbon and its Compounds Test

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Carbon and its Compounds Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The formulae of two organic acids ‘X’ and ‘Y’ are C₁₀H₂₁COOH and C₁₉H₃₉COOH . Which of them exists in liquid state at room temperature?

A
Y

B
X

C
Both X and Y

D
Neither X and Y

Solution

C₁₀H₂₁COO : Hendecanoic acid (also known as undecanoic acid, undecylenic acid and undecylic acid) is a naturally occurring carboxylic acid. It has a melting point in the range 28 - 31 ^oC. It is a low melting solid.

C₁₉H₃₉COO : Arachidic acid or eicosanoic acid is a white crystalline solid at room temperature (25 ^oC). It has a melting point in the range 74 - 76 ^oC
Question 2
1 / -0

Statement A: Acetic acid freezes at 290K.

Statement B: Acetic is also called as glacial acetic acid.

A
Neither Statement A nor Statement B is true.

B
Both the statements A and B are true.

C
Statement A is true; Statement B is false.

D
Statement B is True; Statement A is false.

Solution

Freezing point of ethanoic acid is 17 °C (290 K). When ethanoic acid (acetic acid) is cooled, it freezes to form a colourless, ice-like solid. The solid looks like a glacier and hence pure ethanoic acid is also called glacial ethanoic acid (or glacial acetic acid).
Question 3
1 / -0

Substance ‘X’ is formed by the oxidation of an aldehyde. What will be the action of the substance formed on the litmus solution?

A
No action on litmus solution

B
Turns red litmus blue

C
Turns blue litmus red

D
None of these

Solution

Oxidation of an aldehyde ( -CHO group) leads to the formation a carboxylic acid ( -COOH group). A carboxylic acid turns blue litmus red.
Question 4
1 / -0

An organic compound A of molecular formula C₂H₆O on oxidation gives an acid B with the same number of carbon atoms in the molecule as A. Compound A isused for sterilization of skin by doctors. Name the compounds A and B.

A
Compound A is CH₃COOH and B is C₂H₅COOH

B
Compound A is C₂H₅OHand B is CH₃CHO

C
Compound A is C₂H₅OH and B is CH₃COOH

D
Compound A is CH₃OCH₃and B is CH₃COOCH₃

Solution

Compound A is ethanol and compound B is ethanoic acid. Ethanol gets oxidised to ethanoic acid when heated in the presence of a strong oxidising agent. Ethanol is used as an antiseptic to sterilise wounds and syringes by doctors.

C₂H₅OH + 2[O] --> CH₃COOH + H₂O
Question 5
1 / -0

Soda lime is a mixture of NaOH and CaO. What is the ratio of NaOH and CaO in soda lime?

A
0.125694444444

B
0.0854166666667

C
0.126388888889

D
0.04375

Solution

Soda lime is the mixture of calcium oxide and sodium hydroxide. Soda lime is used in granular form in closed breathing environments, such as general anaesthesia, submarines, rebreathers and recompression chambers, to remove carbon dioxide from breathing gases, to prevent CO₂ retention and carbon dioxide poisoning
Question 6
1 / -0

Statement A: Valerie acid is the common name of hexane.

Statement B: Glycerol is added in the manufacturing of soap.

A
Neither statement A nor statement B is false

B
Both the statements A and B are false

C
Statement B is true and statement A is false

D
Statement A is true and statement B is false

Solution

Valeric acid is another name for pentanoic acid, 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.
Question 7
1 / -0

What is denatured spirit?

A
Methanol only

B
Ethanol + Methanol (5%5%)

C
Ethanol only

D
None of these

Solution

Alcohol meant for industrial purposes is made unfit for human consumption by adding small amounts (about 5%) of methanol to ethanol. The mixture is known as denatured spirit or denatured alcohol. Addition of small amount of copper sulphate is added to impart a blue colour to denatured spirit so that it can be identified easily.
Question 8
1 / -0

Alcohol produces:

A
Non-luminous flame

B
Sooty flame

C
Smoky flame

D
Luminous flame

Solution

Alcohol produces a non-luminous flame. Since it burns with a clear flame and gives out a lot of heat, it is used as a fuel. The parent hydrocarbon of an alcohol is alkane (which has single C-C bonds).

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Carbon and its Compounds Test - 8

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Carbon and its Compounds Test - 8

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Question 1

Y

X

Both X and Y

Neither X and Y

Solution

Question 2

Neither Statement A nor Statement B is true.

Both the statements A and B are true.

Statement A is true; Statement B is false.

Statement B is True; Statement A is false.

Solution

Question 3

No action on litmus solution

Turns red litmus blue

Turns blue litmus red

None of these

Solution

Question 4

Compound A is CH3COOH and B is C2H5COOH

Compound A is C2H5OHand B is CH3CHO

Compound A is C2H5OH and B is CH3COOH

Compound A is CH3OCH3 and B is CH3COOCH3

Solution

Question 5

0.125694444444

0.0854166666667

0.126388888889

0.04375

Solution

Question 6

Neither statement A nor statement B is false

Both the statements A and B are false

Statement B is true and statement A is false

Statement A is true and statement B is false

Solution

Question 7

Methanol only

Ethanol + Methanol (5%5%)

Ethanol only

None of these

Solution

Question 8

Non-luminous flame

Sooty flame

Smoky flame

Luminous flame

Solution

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Compound A is CH₃COOH and B is C₂H₅COOH

Compound A is C₂H₅OHand B is CH₃CHO

Compound A is C₂H₅OH and B is CH₃COOH

Compound A is CH₃OCH₃and B is CH₃COOCH₃