Tag: chemistry

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

Butane is:

  1. ionic compound

  2. noble gas

  3. polar covalent compound

  4. non-polar covalent compound
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

More covalent character is found in 

  1. $SnCl _4$
  2. $KCl$
  3. $CaCl _2$
  4. $SnCl _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Fajan's rule, covalent character increases with the charge on the cation. SnCl4 has a +4 charge on the tin ion, which is higher than the +2 charge in SnCl2 or the +1 charge in KCl/CaCl2, leading to greater polarization and more covalent character.

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

Covalent bond is present in which of the following molecule?

  1. Sodium Chloride

  2. carbon dioxide

  3. Sodium Bromide

  4. All of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. They have low melting points.

  2. They are not electrical conductors.

  3. They exhibit space isomerism.

  4. They undergo chemical reactions quickly.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Covalent compounds are soluble in :

  1. polar solvents

  2. non-polar solvents

  3. concentrated acids

  4. all solvents
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $(H _2O)$.

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

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

  1. an ionic solid

  2. a network solid

  3. a metallic solid

  4. a covalent solid
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following is good conductor of electricity?

  1. Diamond

  2. Graphite

  3. Lamp black

  4. Characoal
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following is used as lubricant ?

  1. Graphite

  2. Charcoal

  3. Diamond

  4. Coke
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Covalent compounds have generally low melting and boiling points.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.