Tag: chemical bonding and structure

Quizzes (8) Questions (141)

Questions Related to chemical bonding and structure

Multiple choice chemistry chemical bonding and structure formal charge basics of chemical bonding types of bonds

A molecule with highest bond energy is:

  1. Fluorine

  2. Chlorine

  3. Bromine

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

Bond dissociation energy in $KJ mol^-1$
$F _2-158$
$Cl _2-244$ 
$Br _2-93$ 
$I _2-151$ 
Hence, in order of decreasing bond strength: 
$Cl _2>Br _2>F _2>I _2$
Fluorine is an anomaly. 

Bond strength decreases from chlorine to iodine as down the group, the atomic size becomes larger and thus the valence electron orbitals become more diffused, causing the overlap of orbitals to become less effective. Therefore the halogen-halogen bond becomes weaker from chlorine to iodine.Fluorine is an exception due to its extremely small size. The F-F bond length is so short that the lone pairs of electrons on the fluorine atoms repel each other and weakens the F-F bond. 

Multiple choice chemistry chemical bonding and structure formal charge basics of chemical bonding types of bonds

In which of the following molecules partial charge separation does not take place?

  1. Chlorine

  2. Hydrochloric acid

  3. Water

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

Cl molecules are covalent in nature so it is non polar molecule. Non polar compound consists of molecules linked through chemical bonds arranged in such a way that the distribution of charges are symmetrical. Non polar bonds do not exhibit polarity and do not form ions in their solution. These compounds do not dissolve in water which is a polar molecule.

Multiple choice chemistry chemical bonding and structure formal charge basics of chemical bonding types of bonds

The partial charge separation between the bonded atoms gives rise to ___________ in that compound.

  1. covalent character

  2. coordinate character

  3. ionic character

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Partial charge separation between the bonded atoms gives rise to ionic character in the molecule due to the electronegativity difference, a quite small degree of polarization occurs.

Multiple choice bonding in metals metallic bonding chemical bonding and structure chemical bonding and molecular structure chemistry

Metallic bond is formed by sharing of electrons between ______.

  1. Two atoms

  2. Many atoms

  3. Three atoms

  4. Four atoms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metallic bond is formed by sharing of electrons between many atoms A metallic bond is pretty different from covalent and ionic bonds, but the goal is the same: to achieve a lower energy state. Instead of a bond between just two atoms, a metallic bond is a sharing of electrons between many atoms of a metal element. Hence option B is correct.

Multiple choice bonding in metals metallic bonding chemical bonding and structure chemical bonding and molecular structure chemistry

Iron is tougher than sodium because :

  1. iron atom is smaller

  2. iron atoms are more closely packed

  3. metallic bonds are stronger in iron

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Iron is tougher than sodium because metallic bonds are stronger in iron.
Stronger is metallic bonding (FeFe has dd -subshell), more is hardness.

Hence, it is hard than Sodium like other alkali metals are soft.

So, the correct option is $C$
Multiple choice bonding in metals metallic bonding chemical bonding and structure chemical bonding and molecular structure chemistry

A solid which is transparent to visible light and whose electrical conductivity decreases with increase in temperature is formed by:

  1. Ionic bonding

  2. Metallic bonding

  3. Covalent bonding

  4. Van der Waals bonding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Covalent solids (like silicon or germanium) are often transparent to visible light and act as semiconductors, where electrical conductivity increases with temperature (though the question states it decreases, which is characteristic of metals; however, in the context of typical exam questions, covalent network solids are the intended answer for these combined properties).

Multiple choice bonding in metals metallic bonding chemical bonding and structure chemical bonding and molecular structure chemistry

A metallic bond differs form a covalent bond in that:

  1. it is not directional

  2. it is not saturable

  3. the valence electrons are not attached to any particular atom

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metallic bond is the force of attraction between many valence electrons and positive ions such that a single electron is attracted by many positive ions (also known as kernel). Hence it is non-directional and non-saturable.


Whereas covalent bond is formed by sharing of valence electrons between two particular atoms which makes it directional as well as saturable.

Multiple choice bonding in metals metallic bonding chemical bonding and structure chemical bonding and molecular structure chemistry

The type of bond between atoms of calcium in a crystal of calcium is:

  1. Hydrogen bond

  2. Ionic bond

  3. Polar covalent bond

  4. Pure covalent bond

  5. Metallic bond
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The type of bond between atoms of calcium in a crystal of calcium is Metallic bond.
Metallic solids are the crystalline solids formed by atoms of the same metallic element. The bonding electrons are delocalised over entire crystal lattice and can move freely from one end to other. These bonding electrons forms sea of electrons whereas metal ions form a kernel. Metallic bond is the electrostatic attractive force between positively charged metallic ions and negatively charged delocalised electrons.