Tag: chemistry

Questions Related to chemistry

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.

Which of the following is good conductor of electricity?

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

  1. Diamond

  2. Graphite

  3. Lamp black

  4. Characoal

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Correct Option: B
Explanation:

Graphite is an allotrope (a different structural form) of carbon (so is diamond), but unlike diamond, graphite can conduct electricity. The reason is that graphite consists of flat hexagons, all liked together in a flat plane. The carbons in the hexagons have delocalized pi bonding (pi bonds, along with a sigma bond, make up a double bond) which allows electrons to easily move from atom to atom making it a good conductor of electricity.

Which of the following is used as lubricant ?

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

  1. Graphite

  2. Charcoal

  3. Diamond

  4. Coke

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Correct Option: A
Explanation:

Graphite is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant. This slippery quality also makes graphite a good material for pencil lead because it easily sloughs off onto paper.

Covalent compounds have generally low melting and boiling points.

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

  1. True

  2. False

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Correct Option: A
Explanation:

Covalent bond have weak intermolecular forces, that is to say, the forces between molecules is very weak. The consequence of this, is that it becomes easy to move individual molecules away from other molecules as the bonding between molecules is weak, hence it needs little energy to break. Since temperature is proportional to energy, that means the temperature required to melt the compound is low.
Thus option "A" is correct.