26. The valence shell separated by the angle 1200 . Therefore, the shape of the molecule is ____________.

27. If there are four bond pairs in the valence shell of the central atom, the four bond pairs will orient along the four corners of a tetrahedron and the bond angle expected is __________

28. The shape of the NH3 molecule is _______________ with N at the apex of the pyramid.

29. Water molecules have ________.

30. To describe covalent bonding, a quantum mechanical model called valence bond theory has been suggested by ______________.

31. Carbon dioxide has ________ shape.

32. In end-on-end overlap __________ is formed.

33. In side-on overlap ______ bond is formed.

34. Sigma bond is stronger than ___________

35. In chlorine molecule one ________ bond is formed.

36. In nitrogen molecule one ________ and two ________ are formed.

37. In oxygen molecule ______ sigma-bond and ______ pi-bond is formed.

38. Hybridization of atomic orbital’s’ was proposed by _______________ (1931).

39. _____________ is a phenomenon of intermixing of atomic orbital’s of almost equal energy which are present in the outer shells of the atom and their reshuffling or redistribution into the same number of orbital’s but with equal properties like energy and shape.

40. Borontriflouride (BF3) has _______________ shape.

41. Ammonia (NH3) has ______________ shape.

42. Shape of water (H2O) molecule is ___________ .

43. ______ hybridization is formed in Beryllium chloride.

44. ______ hybridization is formed in Boron triflouride.

45. _______ hybridisation is formed in ammonia and water molecules.