MUNISH KAKAR's INSTITUTE OF CHEMISTRY
PROPERTIES OF IONIC COMPOUNDS & BASICS OF COVALENT BOND ( WS #2 )
Q1.
Out of NaCl and MgO, which has higher value of lattice energy ?
Q2.
Arrange compounds in property as mentioned ;
(a) NaCl , KCl , BeCl2 , MgCl2
MgO
( Increasing order of solubility in water )
BeCl2 , MgCl2 , NaCl , KCl
(b) NaCl , MgCl2 , AlCl3 ( decreasing order of lattice energy ) AlCl3 , MgCl2 , NaCl
Q3.
Why is melting point of MgO (2800o) higher than that of BaO (1920o) ?
Lattice energy of MgO is more than that of BaO
Q4.
Identify a bond which is shortest C  C , C  C , C  C
Ans
Q5.
Identify a bond which is strongest N  N , N  N , N  N
Ans N  N
Q6.
What are covalency as well possible expanded covalencies of following elements ?
(a) N
(b) P
(c) O
(d) S
(e) F
(a) 3
(b) 3 ,5
(c) 2
(d) 2 , 6 , 8
C C
(f) Cl
(e) 1
(g) C
(f) 1 , 3 , 5 , 7
(g) 2 , 4
Q7.
Q8.
Q9.
Draw electron dot structures of the following compounds ;
(a) NH 3
(b) PCl5
(c) CO2
(d) SOCl2
(e) PCl3
(f) POCl3
(g) H 2O
(h) BF3
(i) BeCl2
(j) SO2Cl2
How much formal charge present on ?
(a) Oxygen ( Ozone )
(b) Nitrogen ( ammonium )
(c) oxygen ( carbonate )
(d) Sulphur ( sulphite )
Classify the following compounds as octet , octet deficient and super octet compounds ;
(a) CCl4
(b) BF3
(c) CO2
(d) POCl3
(e) NH3
Q10. For the given species which structure may be considered correct ?

(a) N 2O ;



N  N  O or N  N  O
(I )

(b) CN ;

CN

or
(I )
( II )
CN
( II )
Q11. Deduce the empirial formulae and draw Lewis structures for the ionic compounds formed
by the following pair of elements:
(i) Na ad O,
(ii) Na and P,
(iii) Al and F
(iv) Ca and O
Q12. Which among the following is least ionic in nature ?
(a) NaCl
(b) LiCl
(c) BeCl2
(d) MgCl2
Q13. Which among the following is correct regarding the following structure ? Given that A , B
and C have atomic numbers 16 , 8 and 1 respectively .
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MUNISH KAKAR's INSTITUTE OF CHEMISTRY
C
B
A
C
B
B
(a) A , B and C have formal charge zero.
(b) Respective compound AB3C2 have 26 valence electrons, 36 noble gas electrons and 10
shared electrons.
(c) both a and b are correct
(d) both a and b are incorrect.
Q14. How many valence electrons and shared electrons are present in given compounds ?
(a) HNO3 24
(b) H 3 PO4 32
(c) H 2 SO4 32
(d) H 2 SO5 38
Q15. Which of the following compounds of chlorine contain both ionic and covalent bonds ?
(a) NaCl
(b) NaCN
(c) PCl3
(d) POCl3
Q16. An atom of an element, A has 3 electrons in its outermost shell, and that B has 6
electrons in the outermost shell. The formula of the compound formed by these two is:
(a) A3B6
(b) A2B
(c) A2B3
(d) A3B2
Q17. Which of the following is an example of super octet molecule?
(a) ClF3
(b) PCl5
(c) IF7
(d) All of these
Q18. Formula of chloride of a metal M is MCl3. Formula of its phosphate will be:
(a) M(PO4)2
(b) M3PO4
(c) MPO4
(d) M2PO4
Q19. Which of the following compounds does not follow octet rule ?
(a) CO2
(b) PCl3
(c) ICl
(d) ClF3
Q20. Two element, X and Y have following electronic configuration :
X = 1s2, 2s2 2p6, 3s2 3p6 4s2; and Y = 1s2, 2s2, 2p6, 3s2 3p5. The compound formed by
combination of X and Y will be:
(a) XY2
(b) X5Y2
(c) X2Y5
(d) XY5
Q21. An element, X is highly electronegative and Y is highly electropositive. Both are univalent.
The compound formed would be :
(a) X+ Y 
(b) X  Y
(c) X  Y+
(d) X  Y
Q22. Which of the following bond is the most polar?
(a) CO
(b) CBr
(c) CF
(d) CS
Q23. Which contains both polar and non-polar bonds ?
(a) NH4Cl
(b) HCN
(c) H2O2
(d) CH4
Q24. The values of Electronegativity of atoms A and B are 1.20 and 4.0 respectively. The
percentage of ionic character in A  B bond is:
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MUNISH KAKAR's INSTITUTE OF CHEMISTRY
(a) 50%
(b) 72.24%
(c) 55.3%
(d) 43%
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