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1.	Lone pair-bond pair repulsion.
2.	Bond pair-bond pair repulsion.
3.	Lone pair-lone pair repulsion and lone pair-bond pair repulsion.
4.	Lone pair-lone pair repulsion.

Q11:

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Subtopic: Hybridisation |

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In which one of the following molecules, the central atom said to adopt sp² hybridisation ?

1. BeF₂

2. BF₃

3. C₂H₂

4. NH₃

Q12:

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Subtopic: Hybridisation |

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According to molecular orbital theory which of the following lists rank the nitrogen species in terms of increasing bond order ?

1. $N_{2}^{-} < N_{2} < N_{2}^{2 -}$

2. $N_{2}^{2 -} < N_{2}^{-} < N_{2}$

3. $N_{2} < N_{2}^{2 -} < N_{2}^{-}$

4. $N_{2}^{-} < N_{2}^{2 -} < N_{2}$

Q13:

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Subtopic: M.O.T |

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Among the following molecules/ions BF₃, NO₂^-, NH₂^- , and H₂O, the central atom is sp² hybridized in :

1. NO₂^-and NH₂^-

2. NH₂^- and H₂O

3. NO₂^- and H₂O

4. BF₃and NO₂^-

Q14:

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Subtopic: Hybridisation |

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Which one of the following is planar ?

1. XeF₄

2. XeO₄

3. XeO₃

4. XeO₃F₂

Q15:

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Subtopic: Hybridisation |

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In ${PO}_{4}^{3 -}$ ion, the formal charge on each oxygen atom and P-O bond order respectively are :

1. -0.75, 0.6

2. -0.75, 1.0

3. -0.75, 1.25

4. -3.1, 1.25

Q16:

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Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |

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The dielectric constant of H₂O is 80. The electrostatic force of attraction between Na⁺ and Cl^- will be

1. reduced to $\frac{1}{40}$ in water than in air

2. reduced to $\frac{1}{80}$ in water than in air

3. will be increased to 80 in water than in air

4. will remain unchanged

Q17:

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Subtopic: Ionic Bond |

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Which of the following is isoelectronic?

1. ${CO}_{2}, {NO}_{2}$

2. ${NO}_{2}^{-}, {CO}_{2}$

3. ${CN}^{-}, CO$

4. ${SO}_{2}, {CO}_{2}$

Q18:

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Subtopic: Types of Chemical Bond |

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In which of the following species the central atom has the type of hybridisation which is not the same as that present in the other three ?

1. SF₄

2. $I_{3}^{-}$

3. ${SbCl}_{5}^{2 -}$

4. PCl₅

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In which of the following species the central atom has the type of hybridisation which is not the same as that present in the other three ? 1. SF4 2. I3- 3. SbCl52- 4. PCl5

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In which of the following species the central atom has the type of hybridisation which is not the same as that present in the other three ?

1. SF₄

2. $I_{3}^{-}$

3. ${SbCl}_{5}^{2 -}$

4. PCl₅