10th Class Physical Science Chapter wise Important bit bank in English

46. Ionic compounds like NaCl are _________ at room temperature.

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solids

47. Ions are positively or negatively charged particles formed by the ________ or
________ of electrons.

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loss , gain

48. The outer most shell is called ___________ and electrons in this are called valence electrons.

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valence shell

49. The reason why atoms bond can be explained on the basis of the _____________.

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octet rule

50. Chemically active elements have an incomplete octet in their _____________ of the atoms.

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valence shell

51. The number of valence electrons available in the atoms decides the type of ________.

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bond

52. Elements which have tendency to gain electrons for attaining octet in their valence shell called ____________ character elements. They form anions.

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electro negative

53. Ionic compounds are often __________ with high melting points.

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crystalline solids

54. The H –H bond length is ______ and Bond (dissociation) energy is __________

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0.74AO, 436 KJmol-1

55. The F – F bond length is _______ and Bond (dissociation) energy is ________

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1.44AO, 159 KJmol-1

56. The Cl– Clbond length is _______ and Bond (dissociation) energy is ________

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1.95AO, 243 KJmol-1

57. The Br – Br bond length is _______ and Bond (dissociation) energy is ________

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2.28AO, 193 KJmol-1

58. The I – I bond length is ________ and Bond (dissociation) energy is ________

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2.68AO, 151 KJmol-1

59. The H – F bond length is _______ and Bond (dissociation) energy is _________

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0.918AO, 570 KJmol-1

60. The H – Clbond length is ________ and Bond (dissociation) energy is _________

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1.27AO, 432 KJmol-1

61. The H – Br bond length is ________ and Bond (dissociation) energy is ________

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1.42AO, 366 KJmol-1

62. The H – I bond length is ________ and Bond (dissociation) energy is ________

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1.61AO, 298 KJmol-1

63. The H – O (of H2O) bond length is ________ and Bond (dissociation) energy is __________

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0.96AO, 460 KJmol-1

64. The H – N (of NH3) bond length is ________ and Bond (dissociation) energy is __________

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1.01AO, 390 KJmol-1

65. The H – C (of CH4) bond length is _________ and Bond (dissociation) energy is ________

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1.10AO, 410 KJmol-1
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