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Science Olympiad Test: Carbon and Its Compounds- 2 - Class 10 MCQ


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15 Questions MCQ Test Olympiad Preparation for Class 10 - Science Olympiad Test: Carbon and Its Compounds- 2

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Science Olympiad Test: Carbon and Its Compounds- 2 - Question 1

The correct electron dot structure of a water molecule is

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 1

The electron dot structure of water is:

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 2

A covalent bond is formed by

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 2

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outermost (valence) electrons, atoms can fill up their outer electron shell and gain stability. Nonmetals will readily form covalent bonds with other nonmetals in order to obtain stability, and can form anywhere between one to three covalent bonds with other nonmetals depending on how many valence electrons they possess.

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Science Olympiad Test: Carbon and Its Compounds- 2 - Question 3

Ethanol reacts with sodium and forms two products. These are

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 3

The equation for the reaction between sodium and ethanol can be written as:
2CH3​CH2​OH + 2Na → 2CH3​CH2​ONa + H2
Therefore, the products formed are sodium ethoxide and hydrogen.

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 4

The soap molecule has a

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 4

A soap molecule is a sodium or potassium salt of long-chain carboxylic acid. It is composed of two sections, i.e., a long hydrocarbon tail and a negatively charged head. The hydrocarbon tail is hydrophobic, i.e., insoluble in water and repelled by water while the polar end is soluble in water and hydrophilic in nature. Because the hydrophobic tail oil and grease is trapped inside a micelle. The hydrophobic head makes the outer surface of the micelle. Hence micelle is easily washed by water.

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 5

Vinegar is solution of

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 5

Vinegar is a dilute aqueous solution of ethanoic acidThe main component of vinegar is acetic acid, which gives a sour taste and pungent aroma. Acetic acid (CH3COOH), also called ethanoic acid, is the most important of the carboxylic acids. Ethanoic acid is used as a solvent for the production of camphor and cooking material.

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 6

Carbon exists in the atmosphere in the form of

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 6

Carbon is found in the atmosphere as carbon dioxide gas in the air. Carbon can also be found in the earth’s crust in the form of carbonates. It can also be found in fossil fuels, organic molecules, cotton, wood and wool, among other things.

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 7

Which of the following is not a saturated hydrocarbon

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 7

Benzene- C6H6 has alternate carbon-carbon single and double bonds.

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 8

Which one of the following is a denatured alcohol?

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 8
  • Ethanol + Methanol​ is denatured alcohol.
  • Denatured alcohol is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption.
  • The term denatured alcohol refers to alcohol products adulterated with toxic and/or bad tasting additives (e.g., methanol, benzene, pyridine, castor oil, gasoline, isopropyl alcohol, and acetone), making it unsuitable for human consumption.
  • The most common additive used is methanol (5–10%), giving rise to the term methylated spirits. Denatured alcohol is used as a lower-cost solvent or fuel for home-scale or industrial use.
Science Olympiad Test: Carbon and Its Compounds- 2 - Question 9

Structural formula of alkene is

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 9

General Molecular formula of alkene-Cn​H2n​
For 5C the molecular formula of alkene is -C5​H10​
And the structural formula can be shown as below:
CH3 ​− CH = CH − CH2​ − CH3​

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 10

Which one of the following is a functional group of alcohol?

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 10
  • Alcohols contain a hydroxyl functional group (-OH). The general molecular formula for alcohol is CnH2n+1OH.
  • In propanol (C3H7OH), the functional group present is an alcohol (−OH) group.
  • In propanone((CH3)2CO), the functional group present is a ketone (−C=O) group.
  • In propanoic acid (C2H5COOH), the functional group present is a carboxylic acid (COOH), group 
  • In ethanal (CH3CHO), the functional group present is an aldehyde(−CHO) group.
  • In propanal (C2H5CHO), the functional group present is an aldehyde(−CHO) group.
Science Olympiad Test: Carbon and Its Compounds- 2 - Question 11

Which of the following is the correct representation of electron dot structures of nitrogen?

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 11

In Nitrogen molecule, each nitrogen atom has 5 valence electrons and there is a triple bond between the two nitrogen atoms. Thus, the correct electron dot structure is; 

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 12

Oils on treating with hydrogen in the presence of palladium or nickel catalyst from fats. This is an example of

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 12

Fats are formed when oils are treated with hydrogen in the presence of a palladium or nickel catalyst. Because hydrogen is added to oil by reducing agents palladium or nickel, this is an instance of an addition reaction.
Addition reaction: An addition reaction is a chemical reaction wherein two or more reactants come together to form a larger single product. Hydrochlorination of propane for which the equation is
CH3CH = CH2 + HCl → CH3C+HCH3 + Cl → CH3CHClCH3

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 13

The first member of alkyne homologous series is

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 13

In the alkyne series, there is a triple bond between the carbon atoms. The first member of the alkyne series is ethyne with two carbon atoms bonded by a triple bond as follow; 
HC ≡ CH.

Science Olympiad Test: Carbon and Its Compounds- 2 - Question 14

While cooking if the bottom of the vessel is getting blackened on the outside. It means that

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 14
  • While cooking, if the bottom of the vessel is getting blackened on the outside, it means that the fuel is not burning completely. 
  • Sometimes, due to lack of oxygen, the fuel does not burn completely.
  • When the fuel does not burn completely then a sooty flame appears which makes the bottom of the utensil black.
  • At the point when fuel doesn't consume appropriately, it starts to form incomplete burning fumes or black fumes that store on the base surface of the pot.
Science Olympiad Test: Carbon and Its Compounds- 2 - Question 15

The heteroatoms present in

(i) Oxygen
(ii) Chlorine
(iii) Carbon
(iv) Hydrogen

Detailed Solution for Science Olympiad Test: Carbon and Its Compounds- 2 - Question 15
  • In organic chemistry, heteroatoms are the ones that are not carbon or hydrogen.
  • Molecules formed by only one type of atom are known as Homo-atomic molecules. For example, H2, N2, P4 etc.
  • Molecules formed by different types of atoms are known as Heteroatomic molecules. For example, CO2, NO2, CH4, HCl etc.
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