Which of the following are isoelectronic and isostructural ?

(1) $N {O_{2}}^{+}, C O_{2}$
(2) $N {O_{3}}^{-}, B F_{3}$

(3) $N H_{3}, C {H_{3}}^{-}$
(4) All of these

Subtopic: Hybridisation |

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Level 2: 60%+

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Q225:

The correct order of acidic strength is :

1. ${Cl}_{2} O_{7} > {SO}_{2} > P_{4} O_{10}$

2. ${CO}_{2} > N_{2} O_{5} > {SO}_{3}$

3. ${Na}_{2} O > MgO > {Al}_{2} O_{3}$

4. $K_{2} O > CaO > MgO$

Subtopic: Acidic, Basic Character & Fajan's Rule |

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Level 1: 80%+

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Q226:

In which of the following molecules / ions are all the bond angles not equal?

(1) $S i F_{4}$

(2) $I C {l_{4}}^{-}$

(3) $S F_{4}$

(4) $P C {l_{4}}^{+}$

Subtopic: Hybridisation |

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Q227:

No S-S bonds are present in?

1. $S_{2}O_{3}^{2-}$

2. $S_{2}O_{4}^{2-}$

3. $S_{2}O_{5}^{2-}$

4. $S_{2}O_{7}^{2-}$

Subtopic: Group 16 - Preparation, Properties & Uses |

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Q228:

What is the correct order from the weakest to the strongest carbon-oxygen bond for the following species?

$C O, C O_{2}, C {O_{3}}^{2 -}, C H_{3} O H$

(1) $C H_{3} O H < C {O_{3}}^{2 -} < C O_{2} < C O$

(2) $C O < C O_{2} < C {O_{3}}^{2 -} < C H_{3} O H$

(3) $C H_{3} O H < C {O_{3}}^{2 -} < C O < C O_{2}$

(4) $C H_{3} O H < C O_{2} < C {O_{3}}^{2 -} < C O$

Subtopic: Resonance & Nature of Compounds |

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Q229:

According to Molecular Orbital Theory, which of the following statement is incorrect?

1. C₂ has no unpaired electrons.

2. In $C_{2}$ molecule, both the bonds $π$ are bonds.

3. $C_{2}$ is paramagnetic but ${C_{2}}^{2 -}$ is diamagnetic.

4. In ${C_{2}}^{2 -}$ ion, there is one $σ$ and two $π$ bonds.

Subtopic: M.O.T |

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Level 2: 60%+

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Q230:

Match the ionization processes listed in column I with the changes observed as listed in column II. For this use the codes given below:

	Column I		Column II
(a)	$N_2 \rightarrow N^+_2$	(p)	Bond order increases and magnetic property is changed.
(b)	$O^+_2 \rightarrow O^{2+}_2$	(q)	Bond order decreases and magnetic property is not changed.
(c)	$B_2 \rightarrow B^+_2$	(r)	Bond order increases and magnetic property is not changed.
(d)	$NO^- \rightarrow NO$	(s)	Bond order decreases and magnetic property is changed.

Note: Here change in magnetic property refers to the change from diamagnetic to paramagnetic
or paramagnetic to diamagnetic.

	a	b	c	d
1.	s	q	p	r
2.	s	p	q	r
3.	r	q	s	p
4.	p	s	q	r

Subtopic: M.O.T |

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Q231:

Arrange the following molecules from most to least polar.

$C H_{4} C F_{2} C l_{2} C F_{2} H_{2} C C l_{4} C C l_{2} H_{2}$
$I I I I I I I V V$

(1) III>V>II > IV=I

(2) II>IV>III>IV>I

(3) III>II>V>IV>I

(4) V>III>II>IV=I

Subtopic: Polarity |

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Q232:

Which of the following statements is/are correct?

1.	$(CH_3)_3 COH$ is less acidic than $(CH_3)_3SiOH$
2.	Like $CO$, its analogue $Si$ is not stable.
3.	In phosgene, $C-O$ bond length is longer than expected while $C-Cl$ bond length is shorter.
4.	All of the above.

Subtopic: Resonance & Nature of Compounds |

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Q233:

The boiling point of $C C l_{4}$ is higher than that of $C H C l_{3}$ because :

(1) The dipole moment of $C C l_{4}$ is greater than that of $C H C l_{3}$

(2) $C C l_{4}$ forms hydrogen bonds.

(3) $C C l_{4}$ has higher molecular mass than that of $C H C l_{3}$

(4) $C C l_{4}$ is more ionic than $C H C l_{3}$

Subtopic: van der Waal Force & Hydrogen Bonding |

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Which of the following are isoelectronic and isostructural ?

(1) $N {O_{2}}^{+}, C O_{2}$
(2) $N {O_{3}}^{-}, B F_{3}$

(3) $N H_{3}, C {H_{3}}^{-}$
(4) All of these

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	Column I		Column II
(a)	\(N_2 \rightarrow N^+_2\)	(p)	Bond order increases and magnetic property is changed.
(b)	\(O^+_2 \rightarrow O^{2+}_2\)	(q)	Bond order decreases and magnetic property is not changed.
(c)	\(B_2 \rightarrow B^+_2\)	(r)	Bond order increases and magnetic property is not changed.
(d)	\(NO^- \rightarrow NO\)	(s)	Bond order decreases and magnetic property is changed.

1.	\((CH_3)_3 COH\) is less acidic than \((CH_3)_3SiOH\)
2.	Like \(CO\), its analogue \(Si\) is not stable.
3.	In phosgene, \(C-O\) bond length is longer than expected while \(C-Cl\) bond length is shorter.
4.	All of the above.

Which of the following are isoelectronic and isostructural ? (1) NO2+,CO2 (2) NO3-,BF3 (3) NH3,CH3- (4) All of these

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Which of the following are isoelectronic and isostructural ?

(1) $N {O_{2}}^{+}, C O_{2}$
(2) $N {O_{3}}^{-}, B F_{3}$

(3) $N H_{3}, C {H_{3}}^{-}$
(4) All of these