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NTSE Test: Carbon & Its Compounds - Class 10 MCQ


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25 Questions MCQ Test Science Class 10 - NTSE Test: Carbon & Its Compounds

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NTSE Test: Carbon & Its Compounds - Question 1

Ethane, with the molecular formula C2H6 has

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 1

Ethane with molecular formula C2H6 has seven covalent bonds. 6 bonds between C-H and one is between C-C.

NTSE Test: Carbon & Its Compounds - Question 2

Butanone is a four-carbon compound with the functional group

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 2

Key Points:
- Butanone is a four-carbon compound.
- We need to identify the functional group present in butanone.
Explanation:
1. Butanone is a four-carbon compound, which means it contains four carbon atoms.
2. To identify the functional group present in butanone, we need to look for any specific groups attached to the carbon atoms.
3. The functional group in butanone is a ketone group.
4. A ketone is a carbonyl group (C=O) attached to two carbon atoms.
5. In butanone, the carbonyl group is attached to the second carbon atom, making it a ketone.
6. Therefore, the correct answer is C: Ketone.
Answer: C: Ketone
NTSE Test: Carbon & Its Compounds - Question 3

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 3
The blackening of the bottom of the vessel while cooking indicates:
1. Incomplete combustion:
- When the bottom of the vessel gets blackened, it suggests that the fuel is not burning completely.
- Incomplete combustion occurs when there is insufficient oxygen supply for the combustion process.
- The lack of oxygen causes the fuel to produce soot, which then accumulates on the bottom of the vessel, resulting in blackening.
2. Insufficient ventilation:
- Another possible reason for the blackening of the vessel is inadequate ventilation in the cooking area.
- Insufficient ventilation can lead to incomplete combustion as the supply of fresh air is restricted.
- Without proper airflow, the fuel cannot burn efficiently, resulting in the formation of soot on the vessel.
3. Improper fuel quality:
- The quality of the fuel used for cooking can also contribute to the blackening of the vessel.
- If the fuel is damp or wet, it may not burn properly, leading to incomplete combustion.
- Wet fuel can release more smoke and soot, which can then settle on the vessel's bottom.
4. Incorrect cooking technique:
- The way cooking is being done can also be a factor in the blackening of the vessel.
- If the flame is too high or the heat source is concentrated on one spot, it can cause uneven heating and result in blackening.
- It is essential to ensure that the heat is evenly distributed and controlled to prevent the bottom of the vessel from blackening.
In conclusion, the blackening of the bottom of the vessel while cooking indicates incomplete combustion, insufficient ventilation, improper fuel quality, or incorrect cooking techniques. To avoid this, it is important to ensure proper ventilation, use dry fuel, maintain an even heat distribution, and adjust the cooking technique accordingly.
NTSE Test: Carbon & Its Compounds - Question 4

A covalent bond is formed by

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 4

A covalent bond is formed by mutual sharing of electrons between the 2 atoms.

NTSE Test: Carbon & Its Compounds - Question 5

Which family of organic compounds does not contain any multiple bonds?

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Alkyl halides are polar in nature, but they are almost insoluble in water. They can neither form Hydrogen bond nor they can break hydrogen bond between water molecules.

NTSE Test: Carbon & Its Compounds - Question 6

Which of the following is not a saturated hydrocarbon?

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 6

Benzene is C6H6 an aromatic compound in the form of a closed ring. It contains alternate double and single bond.

NTSE Test: Carbon & Its Compounds - Question 7

Benzene with molecular formula, C6H6, has

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 7

In benzene each carbon is bonded with other carbon and hydrogen. So, for each carbon there will be two sigma bonds, one with other carbon and another one is with hydrogen. So, now we can calculate the single bonds => 6*2= 12 
And when we come to the no. of pi bonds in each carbon in Benzene there will be one hybridized orbital that will overlap with other carbon axially to form pi bonds. There will be 6 carbons in benzene, so=> 6/2=3 
Hence, we can say there are 3 double bonds in benzene. 

NTSE Test: Carbon & Its Compounds - Question 8

The functional group in methanol and methanal respectively are :

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Methane + ol = Methanol
Methane + al = Methanal

NTSE Test: Carbon & Its Compounds - Question 9

In graphite carbon atoms are arranged in layers of

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 9

Graphite is composed of layers of carbon atoms that are arranged in 6 - membered hexagonal rings. These rings are attached to one another on their edges. Layers of fused rings can be modeled as an infinite series of fused benzene rings.

NTSE Test: Carbon & Its Compounds - Question 10

Graphite is a soft lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite.

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 10

Graphite has a hexagonal sheet structure in which every carbon atom is bonded to 3 other carbon atoms and the adjacent layers are arranged together by weak van der waal forces of attraction. 
The gap between the adjacent layers makes it soft and slippery.

NTSE Test: Carbon & Its Compounds - Question 11

Which of the following represent the correct order of unsaturation?

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Alkenes contain C-C double bond whereas alkynes contain C-C triple bond.

NTSE Test: Carbon & Its Compounds - Question 12

The general formula of alcohol is

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 12

The general formula of monohydric alcohols is CnH2n+1OH where n = 1, 2, 3… etc.. or R-OH where R is any alkyl group.
Alcohols are formed by replacement of 1 hydrogen atom from hydrocarbons.

NTSE Test: Carbon & Its Compounds - Question 13

Wine contains

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 13

Ethanol is used as the important ingredient in manufacturing of wine, beer and other brewerie products.

NTSE Test: Carbon & Its Compounds - Question 14

The acid present in vinegar is

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Vinegar is an aqueous solution of acetic acid. Vinegar typically contains 5–8% acetic acid by volume.

NTSE Test: Carbon & Its Compounds - Question 15

The reaction 2C2H5OH + 2Na → 2C2H5ONa + H2 suggests that ethanol is

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 15

Ethanol is neutral in nature as it shows no effect on litmus paper.But here it is acting as an acid as,Na is highly reactive.

NTSE Test: Carbon & Its Compounds - Question 16

Which of the following substance is added to denature ethanol?

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 16

Ethanol + methanol leads in formation of denatured alcohol. Methanol is added to make industrial alcohol unfit for drinking.

NTSE Test: Carbon & Its Compounds - Question 17

Which of the following substances cannot be used to distinguish ethanol from ethanoic acid?

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 17

Option ( a) Na metal is the correct answer because other options ( b) ,( c) and ( d) are used to distinguish ethanol from ethanoic acid.

NTSE Test: Carbon & Its Compounds - Question 18

An example of soap is

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 18

C17H35COOC2H5 + NaOH → C17H35COONa + C2H5OH

NTSE Test: Carbon & Its Compounds - Question 19

Detergents are sodium and potassium salts of long chain

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 19

Detergents are sodium and potassium salts of Sulphonic acids. Thus detergents gave Sulphonic group instead of Carboxylic group. The detergents don't form precipitate with these metal ions.

NTSE Test: Carbon & Its Compounds - Question 20

Which of the following salts when dissolved in water produce hard water?

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 20

When either calcium sulphate or magnesium bicarbonate or calcium chloride is dissolved in water, hard water is obtained. Hard water is due to presence of sulphates, chlorides or bicarbonates of magnesium and calcium in water. 

NTSE Test: Carbon & Its Compounds - Question 21

The functional group in aldehydes is

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NTSE Test: Carbon & Its Compounds - Question 22

Ethanol on complete oxidation gives

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 22

Ethanol is firstly oxidized to acetaldehyde and the acetaldehyde is then oxidized to acetic acid. This reaction is considered as a green catalytic process for the only reduction product is water.

NTSE Test: Carbon & Its Compounds - Question 23

Which class of organic compounds give effervescence with NaHCO3 solution ?

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 23

NTSE Test: Carbon & Its Compounds - Question 24

Carboxylic acids are obtained from alcohols by -

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 24

 

NTSE Test: Carbon & Its Compounds - Question 25

Soaps are prepared by alkaline hydrolysis of -

Detailed Solution for NTSE Test: Carbon & Its Compounds - Question 25

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. Since this reaction leads to the formation of soap, it is called the saponification process. 

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