In which of the following compound electrovalent, covalent and co-ordinate bonds are present?

NH₄Cl
CCl₄
CaCl₂
H₂O

Solution

For AB bond if percent ionic character is plotted against electronegativity difference (X_A– X_B), the shape of the curve would look like

(A)
(B)
(C)
(D)

Solution

Percent ionic character is given by following equation.% of ionic character = 16(X_A– X_B) + 3.5(X_A – X_B)² From the above relation, it is clear that as soon as(X_A– X_B) increases, % ionic character will also increase.Therefore,curve C show a correct path.

Which does not show resonance :

Benzene
Aniline
Ethylamine
Toluene

Solution

Benzene and the compounds having benzene ring show resonance. Hence, ethylamine does not show resonance.

Polarisibility of halide ions increases in the order

F^-, I^-, Br^-, Cl^-
Cl^-, Br^-, I^-, F^-
I^-, Br^-, Cl^-, F^-
F^-, Cl^-, Br^-, l^-

Solution

In case of anions having same charge as the size of anion increases, polarisibility of anion also increases.

Which bond angle θ would result in the maximum dipole moment for the triatomic molecule YXY

θ= 90°
θ= 120°
θ= 150°
θ= 180°

Solution

As compared to covalent compounds, electrovalent compounds generally have

Low melting points and low boiling points
Low melting points and high boiling points
High melting points and low boiling points
High melting points and high boiling points

Solution

Ionic compounds generally have high melting and boiling points because of the strong electrostatic force of attraction between oppositely charged ions.Consequently, a considerable amount of energy is required to overcome strong attractive.

Methanol and ethanol are miscible in water due to

Covalent character
Hydrogen bonding character
Oxygen bonding character
None of the above

Solution

Which of the following substances has the greatest ionic character ?

Cl₂O
NCl₃
PbCl₂
BaCl₂

Solution

Identify the non polar molecule in the following compounds:

H₂
HCl
HF and HBr
HBr

Solution

In H₂, both atoms are identical, so the molecule is non polar.

Pauling’s electronegativity values for elements are useful in predicting :

polarity of bonds in molecules
ionic and covalent nature of bonds
coordination number
Both (a) and (b)

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