EASY
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As compared to covalent compounds, electrovalent compounds generally have:

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Important Questions on Chemical Bonding and Molecular Structure

EASY
Which of the alkaline earth metal halides given below is essentially covalent in nature?
MEDIUM

Find out the correct order of ionic character in the following molecules

i  SO2     ii  K2O     iii  N2    iv  LiF

EASY
The formation of the oxide ion, O2-(g) , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

Og+e-O-g   ;  ΔfH=-141 kJ mol-1

O-g+e-O2- g ;  ΔfH=+780 kJ mol-1

Thus process of formation of O2- in gas phase is unfavourable though O2- is isoelectronic with neon. It is due to the fact that,
EASY
Which of the following contains both covalent and ionic bonds?
MEDIUM

Match the following species with the correct number of electrons present in them:

Species Number of Electrons
 (iBe2+ (a) 0
 (iiH+ (b) 10
 (iiiNa+ (c) 2
 (ivMg+ (d) 11
  (e) 4

 

MEDIUM
Amongst LiCl, RbCl, BeCl2 and MgCl2 the compounds with the greatest and the least ionic character, respectively are :
MEDIUM

Two elements A and B have electronegativities 1.2 and 3.0 respectively. The nature of bond between A and B would be

MEDIUM

What should be the correct order of lattice energy values of the following alkali halides?

LiCl,KI,KCland NaCl

EASY

For the molecules LiF,N2, K2O and ClF3, what is the correct arrangement of bonds in order of increasing ionic character?

MEDIUM

Give a reason for the following:

Ionic compounds have a high melting point.

HARD
Sodium sulphate is soluble in water but barium sulphate is sparingly soluble because
EASY
Pick out the isoelectronic structures from the following

CH3+I H3O+II NH3III CH3-IV
MEDIUM
The solubility of K2SO4, BeSO4, CaSO4 and BaSO4 follow the order:
EASY
For a reaction equilibrium, N2O4(g)2NO2(g), the concentrations of N2O4 and NO2 at equilibrium are 4.8×10-2 and 1.2×10-2mol/L respectively. The value of Kc for the reaction is
MEDIUM
Statement I: The fluorides of alkaline earth metals are almost insoluble in water.

Statement II: The lattice energies of the fluorides of alkaline earth metals are very high.
EASY
How many electrons are there in the valence shell of (i) a magnesium atom, and (ii) an oxygen atom?
MEDIUM
Among the following LiCl, BeCl2, BCl3, CCl4 which will have the lowest melting point and the highest solubility in water