Question

Which of the following factor does not favour covalent bond?
1. high ionisation energy
2. high electron affinity
3. one non-metal atom & one metal atom
4. none of these

Answer 1

Answer:

Correct option is A

High Ionization energy

Since the covalent bond is formed by mutual sharing of electrons, therefore, the factors which favour the formation of covalent bonds are as follows :

1. Electron Affinity. A covalent bond is generally favoured between the two atoms if both the atoms have high electron affinity.

2. Ionisation Energy. The ionisation energy of both the atoms participating in bonding should be high.

3. Atomic Size. Atomic size of the atoms forming covalent bond should be smaller. Smaller the atomic radii of atoms, more stronger the covalent bond will be. For example, H−H bond is stronger than Cl−Cl bond which in tum is more stronger than Br-Br bond.

4. Electronegativity. The electronegativities of both then atoms should be high. The difference of electronegativities between the two atoms should be minimum.

So High Ionization energy of the atoms involves in covalent bond formation Hence option A is correct.

Answer 2

Answer:

3 ) one non - metal atom &one metal atom

Explanation:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals.

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