Chemical Bonding

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Q1. Which of the following ions has a stable octet? (2023)

Solution:

All of the ions Na+, Cl-, and Mg2+ have achieved a stable octet configuration.

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Q2. Which molecule has the highest electronegativity difference? (2021)

Solution:

NaCl has the highest electronegativity difference between sodium and chlorine, leading to a strong ionic bond.

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Q3. Which of the following molecules has a polar covalent bond? (2023) 2023

Solution:

Water (H2O) has a polar covalent bond due to the difference in electronegativity between hydrogen and oxygen.

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Q4. What type of bond is present in O2? (2022)

Solution:

O2 has a double bond, as two pairs of electrons are shared between the two oxygen atoms.

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Q5. What is the shape of the methane (CH4) molecule? (2023)

Solution:

Methane (CH4) has a tetrahedral shape due to the four pairs of bonding electrons around the central carbon atom.

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Q6. Which of the following compounds is covalent? (2019)

Solution:

H2O is a covalent compound formed by the sharing of electrons between hydrogen and oxygen atoms.

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Q7. What type of bond is formed when two atoms share electrons? (2023)

Solution:

A covalent bond is formed when two atoms share electrons to achieve stability.

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Q8. What is the geometry of a molecule with two bonding pairs and no lone pairs on the central atom? (2023)

Solution:

The geometry is linear when there are two bonding pairs and no lone pairs on the central atom.

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Q9. Which of the following compounds has a dipole moment? (2023)

Solution:

HCl has a dipole moment because it is a polar molecule with a significant difference in electronegativity between hydrogen and chlorine.

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Q10. Which of the following elements is most likely to form an ionic bond? (2023)

Solution:

Sodium is most likely to form an ionic bond as it readily loses an electron to form Na+.