Tag: properties of covalent compounds

Questions Related to properties of covalent compounds

Which statement about bonding is not correct?

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. Carbon can form four single covalent bonds

  2. Chlorine atoms react to gain a noble gas electronic structure

  3. Covalent bonding involves losing and gaining electrons

  4. Hydrogen molecules have the formula $H _{2}$

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Correct Option: C
Explanation:


Solution:- (C) Covalent bonding involves losing and gaining electrons

Covalent bonding involves sharing of electrons while the losing and gaining of electrons is found in ionic bonding.

Covalent bonds are formed when electrons are $1$ .
Most covalent compounds have $2$ electrical conductivity.
Which words correctly complete gaps $1$ and $2$?

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. Shared - high

  2. Shared - low

  3. Transferred - high

  4. Transferred - low

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Correct Option: B
Explanation:

Solution:- (B) Shared - low

  1. Covalent bonds are formed by sharing of electrons.
  2. Most covalent compounds have low electrical conductivity due to low mobility, i.e., no free electrons.

Compound $X$ consists of molecules.
In the liquid state X will

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. becomes ionic

  2. be an electrolyte but not conduct electricity.

  3. conduct electricity only

  4. not conduct electricity

  5. non of the above

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Correct Option: D
Explanation:

Compound X consists of molecules, so its covalent compounds and dont have any charged ions to conduct electricity so it will not conduct electricity.

Butane is:

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. ionic compound

  2. noble gas

  3. polar covalent compound

  4. non-polar covalent compound

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Correct Option: D
Explanation:

Butane can be written as $CH _3-CH _2-CH _2-CH _3$. The electronegativities of Carbon and hydrogen are almost same and hence none of them is more electronegative than the other. Thus the compound is non polar in nature, as the electrons are equally distributed on the molecule.

Butane is an organic molecule and the bonds are formed by mutual sharing of electrons between the atoms. Hence, butane is a covalent compound.
Option D is the correct answer.

More covalent character is found in 

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. $SnCl _4$

  2. $KCl$

  3. $CaCl _2$

  4. $SnCl _2$

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Correct Option: A

Covalent bond is present in which of the following molecule?

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. Sodium Chloride

  2. carbon dioxide

  3. Sodium Bromide

  4. All of these

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Correct Option: B
Explanation:

Carbon dioxide $CO _2$ is covalent compound. In this molecule, two non-metals carbon and oxygen share their electrons to form covalent bonding. Remaining all molecules shows formation of ionic bonding.

Compound $X$ is highly volatile and insoluble in water. Bonding in $X$ is :

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. ionic

  2. covalent

  3. polar covalent

  4. coordinate

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Correct Option: B
Explanation:

Like dissolves like. As the compound is volatile and insoluble in water, so compound in non-polar, means it contains covalent bonds.


Hence the correct option is B.

Which of the following is not a property of covalent compounds?

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. They have low melting points.

  2. They are not electrical conductors.

  3. They exhibit space isomerism.

  4. They undergo chemical reactions quickly.

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Correct Option: D
Explanation:

Covalent compounds have low melting points. are non-conductors of electricity, they exhibit space isomerism because covalent bonds are directional. Covalent compounds reactions are slow because breaking of bond is non-spantaneous.

Covalent compounds are soluble in :

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. polar solvents

  2. non-polar solvents

  3. concentrated acids

  4. all solvents

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Correct Option: B
Explanation:

Polar compound are soluble in polar solvents. As covalent compounds are less polar or non-polar, they are soluble in non-polar solvents like ether and ionic compounds are soluble in polar solvents like water $(H _2O)$.

A solid substance is soft, has a low melting point, and is a poor conductor of electricity. It is:

chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

  1. an ionic solid

  2. a network solid

  3. a metallic solid

  4. a covalent solid

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Correct Option: D
Explanation:

Covalent solids are soft, have a low melting point (due to relatively weak bonds), and are a poor conductor of electricity (due to absence of free ions).


Option D is correct.