Untitled Document

Question Bank No: 1

1. The hybrid state of C atom in $C_{2} H_{2}$ is same as that of C in

a)		HCHO
b)		graphite
c)		$C_{2} H_{4}$
d)		HCN

2. ALC $L_{3}$ is covalent but AI $F_{3}$ is ionic, this fact can be explained on the basis of

a)		Fajan rules
b)		Octet rule
c)		electron affinity of halogen
d)		molecular orbital theory

3. The hybrid state of N in N $O_{3}^{-}$ is same as that of S in

a)		$H_{2} S$
b)		S $O_{3}$
c)		S $O_{4}^{2 -}$
d)		$H_{2} {SO}_{4}$

4. A molecule A $B_{3}$ exhibits a dipole moment 0, then the hybrid state of A(Z $< 21)$ should be

a)		S $p^{2}$
b)		sp
c)		s $p^{3} d$
d)		s $p^{3}$

5. BiC $L_{5}$ does not exist, the concept which best explains the above fact is

a)		Resonance
b)		non-availability of vacant d-orbitals
c)		inter-pair effect
d)		molecular orbital concept

6. In open cage-like structure of ice, which bonds are present?

a)		Covalent and H-bonds
b)		Covalent and co-ordinate bonds
c)		Co-ordinate and bonds
d)		H-bonds only

7. Which of the following pairs of compound will not form H-bonds with each other?

a)		Ethanol-methanol
b)		Ethanol-water
c)		Chloroform-acetone
d)		Carbon tetrachloride-acetone

8. Which of the following halide has maximum ionic character?

a)		BaC $L_{2}$
b)		BeC $L_{2}$
c)		MgC $L_{2}$
d)		CaC $L_{2}$

9. A molecule M $X_{4}$ has a square planar shape. The number of lone pairs of electrons around M is

a)		2
b)		1
c)		3
d)		0

10. Which of the following species ingascous states assumes linear structure?

a)		SnC $L_{2}$
b)		ZnC $L_{2}$
c)		PbC $L_{2}$
d)		C $H_{2} O$

11. In a triatomic molecule XYX with angle $θ$ around Y, the dipolemoment would be highest when

a)		$θ = 90^{0}$
b)		$θ = 120^{0}$
c)		$θ = 1 50^{0}$
d)		$θ = 180^{0}$

12. The nature of bonding in CC $L_{4}$ and Ca $H_{2}$ is respectively

a)		Ionic covalent
b)		covalent in both
c)		covalent, ionic
d)		polar covalent both

13. Shape of Xe $F_{4}$ is

a)		Square planar
b)		tetrahedral
c)		octahedral
d)		trigonal planar

14. Two element have electronegativity of 1.2 and 3.0 bond formed between them would be

a)		Ionic
b)		polar covalent
c)		Co-ordinate
d)		metallic

15. N $H_{3}$ and B $F_{3}$ form an adduct readily because they form

a)		A co-ordinate bond
b)		a covalent bond
c)		an ionic bond
d)		a hydrogen bond

16. Octahedral molecular shape is adopted in case the central atom adopts.......hybridization.

a)		S $p^{3} d$
b)		S $p^{3} d^{2}$
c)		S $p^{3} d^{3}$
d)		None of these

17. The number of carbon atoms arranged linearly in ${CH}_{3} - C H_{2} - C \equiv C - {CH}_{3}$ is

a)		5
b)		4
c)		3
d)		2

18. Hydrogen atoms in hydrogen molecules are held by

a)		Covalent bonding
b)		ionic bonding
c)		metallic bonding
d)		Van der Waal's force

19. Which of the following contains a co-ordiante covalent bond?

a)		$N_{2} H_{5}^{+}$
b)		BaC $L_{2}$
c)		HCL
d)		$H_{2} O$

20. In which of the following molecules, is the covalent bond most polar?

a)		HI
b)		HBr
c)		HCl
d)		$H_{2}$

21. $O_{2}$ molecule is

a)		paramagnetic
b)		diamagnetic
c)		ferromagnetic
d)		none of these

22. Which of the following will be octahedral?

a)		S $F_{6}$
b)		B $F_{4}^{-}$
c)		P ${Cl}_{5}$
d)		${BO}_{3}^{3 -}$

23. The hydrogen bond is strongest in

a)		O $-$ H...S
b)		S $-$ H...O
c)		F $-$ H...F
d)		F $-$ H...O

24. Which of the following hydrides has the lowest boiling point ?

a)		$H_{2} O$
b)		$H_{2}$ S
c)		$H_{2} Se$
d)		$H_{2} Te$

25. The bond length and bond angles in the molecules of methane, ammonia and water are given below
chemicalbonding-q19
This variation in bond angle is a result of
1. the increasing repulsion between hydrogen atoms as the bond length decreases
2. the number of non- bonding electron pairs in the molecules
3. a non- bonding electron pair leaving a greater repulsive force than a bonding electron pair

a)		1,2 and 3 are correct
b)		1 and 2 only are correct
c)		2 and 3 only are correct
d)		1 only is correct

26. Match List I and List II and choose the correct matching codes from the choice given
$\begin{matrix} List I & List II \\ a) P {Cl}_{5} & 1) Linear \\ b) I F_{7} & 2) Pyramidal \\ c) H_{3} O^{+} & 3) Trigonal bipyramidal \\ d) Cl O_{2} & 4) Tetrahedral \\ e) N {H_{4}}^{+} & 5) Pentagonal bipyramidal \\ 6) Angular \end{matrix}$

a)		a-3, b-5, c-2, d-1, e-4
b)		a-3, b-5, c-4, d-1, e-2
c)		a-3, b-5, c-6, d-1, e-2
d)		a-3, b-5, c-2, d-6, e-4

27. Which of the following is paramagnetic with bond order 0.5?

a)		$F_{2}$
b)		${H_{2}}^{+}$
c)		$N_{2}$
d)		${O_{2}}^{-}$

28. The sequence that correctly described the relative bond strength pertaining to oxygen molecule and its cation or anions is

a)		${O_{2}}^{2 -} > {O_{2}}^{-} > O_{2} > {O_{2}}^{+}$
b)		${O_{2}}^{2 -} > {O_{2}}^{+} > {O_{2}}^{-} > {O_{2}}^{2 -}$
c)		${O_{2}}^{+} > O_{2} > {O_{2}}^{2 -} > {O_{2}}^{-}$
d)		${O_{2}}^{+} > O_{2} > {O_{2}}^{-} > {O_{2}}^{2 -}$

29. Which of the following molecule is planar ?

a)		C $H_{4}$
b)		N $H_{3}$
c)		$C_{2} H_{4}$
d)		Si ${Cl}_{4}$

30. A particular solid is very hard and has a high melting point. In solid state it is non conductor and its melt is a conductor of electricity. Classify the solid

a)		metallic
b)		molecular
c)		network
d)		ionic

31. In which of the following molecules the central atom does not follow the octet rule?

a)		S $O_{2}$
b)		B $F_{3}$
c)		$H_{2}$ O
d)		$H_{2}$ S

32. Which carbon is more electronegative?

a)		s $p^{3}$ hybridized carbon
b)		sp hybridized carbon
c)		s $p^{2}$ hybridized carbon
d)		always same irrespective of its hybrid state

33. Which of the following statements is correct?

a)		All carbon to carbon bonds contain a sigma bond and one or more pi bonds
b)		All carbon to hydrogen bonds are pi bonds
c)		All oxygen to hydrogn bonds are hydrogen bonds
d)		All carbon to hydrogen bonds are sigma bonds

34. Which one of the following has the smalles bond angle?

a)		N $H_{3}$
b)		Be $F_{2}$
c)		$H_{2}$ O
d)		C $H_{4}$

35. Which of the following bonds require the largest amount of bond energy to dissociate the atoms concerned ?

a)		H-H bond in $H_{2}$
b)		C-H bond in C $H_{4}$
c)		N $\equiv N$ bond in $N_{2}$
d)		O=O bond in $O_{2}$

36. Which one of the followinf material conducts electricity?

a)		diamond
b)		crystalline sodium chloride
c)		barium sylphate
d)		fused potassium chloride

37. Which of the following represents a non-polar molecule with polar bonds>

a)		N ${Cl}_{3}$
b)		N $F_{3}$
c)		$N_{2}$
d)		C ${Cl}_{4}$

38. Which of the following has a shape different from others?

a)		P ${Cl}_{3}$
b)		N $H_{3}$
c)		P $H_{3}$
d)		B $F_{3}$

39. The hybrid states of C in C $S_{2},$ HCHO and $C_{60}$ molecule are respectively

a)		sp, s $p^{2}, s p^{3}$
b)		sp, s $p^{2}, s p^{2}$
c)		s $p^{2}$ , s $p^{2}, s p^{2}$
d)		sp, s $p^{2}, s p^{4}$

40. The interatomic distance in $H_{2}$ and ${Cl}_{2}$ is respectively 74 and 198 pm. The H-Cl bond is likely to be

a)		272 pm
b)		136 pm
c)		124 pm
d)		248 pm

41. Which shape is associated with the molecular structure that has the bond angle of $120^{o}$ around the central atom is

a)		pyramidal
b)		bent
c)		square planar
d)		triangular planar

42. The geometry of I $F_{7}$ is

a)		Heptagonal
b)		Icosehedral
c)		Trigonal bipyramidal
d)		Pentagonal bupyramidal

43. The Lewis formula of SO ${Cl}_{2}$ , the total number of bond pair and lone paris of electrons around sulphur are

a)		2,1
b)		2,2
c)		3,1
d)		3,0

44. Sidewise overlap of p-p orbitals forms

a)		Sigma bond
b)		Pi bond
c)		Coordinate bond
d)		H-bond

45. Which of the following arrangement of molecules is correct on the basis of their dipole moments ?

a)		B $F_{3} > N F_{3} > N H_{3}$
b)		$N F_{3} >$ B $F_{3} > N H_{3}$
c)		$N H_{3} >$ B $F_{3} > N F_{3}$
d)		$N H_{3} > N F_{3}$ $>$ B $F_{3}$

46. 1 $F_{5}$ has the following hybridisation

a)		s $p^{3} d^{2}$
b)		s $p^{3} d^{3}$
c)		s $p^{3} d$
d)		none of these

47. The hybridisation of sulphur in S $O_{2}$ is

a)		s $p^{2}$
b)		s $p^{3}$
c)		)sp
d)		s $d^{2}$

48. The relationship between the dissociation energy of $N_{2}$ and $N_{2}^{+}$ is

a)		dissociation energy of $N_{2} = dissociation energy of N_{2}^{+}$
b)		dissociation energy of $N_{2}$ can either be lower or higher than the dissociation energy of $N_{2}^{+}$
c)		dissociation energy of $N_{2}$ $>$ dissociation energy of $N_{2}^{+}$
d)		dissociation energy of $N_{2}^{+} >$ dissociation energy of $N_{2}$

49. The bond order in $O_{2}^{+}$ is

a)		2
b)		2.5
c)		1.5
d)		3

50. Which one among the following is not paramagnetic ?
(At.no.Be = 4 ;Ne =10 ;Cl = 17 ; As = 33)

a)		B $e^{-}$
b)		N $e^{2 +}$
c)		C $l^{-}$
d)		A $s^{+}$