Class XI Chemistry Chemical Bonding and Molecular Structure 1

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Question 1

For which of the elements of different groups, the change in nonpolar covalent radii is maximum?

• AGroups 1 and 2
• BGroups 14 and 15
• CGroups 16 and 17
• DGroups 17 and 18

Question 2

Which of the following molecule has no dative bond?

• ACO₃^2-
• BCO
• CSO₄^2-
• DAll of these

Question 3

The number of lone pair present in N-atom in NH₄⁺ is-

• AZero
• B1
• C2
• D3

Question 4

The molecular orbital formed by the addition overlap of atomic orbitals is called ______. Whereas, the molecular orbital formed by the subtraction overlap of atomic orbitals is called_______.

• ABonding Molecular Orbital, Anti-bonding Molecular Orbital
• BAnti-bonding Molecular Orbital, Bonding Molecular Orbital
• CBoth A and B may be correct
• DNone of these

Question 5

The no. of unpaired electrons in O₂ molecule is-

• AZero
• B1
• C2
• D3

Question 6

Which of the following species contains equal number of and bonds?

• A
• B
• C
• DCH₂ (CN)₂

Question 7

Which of the following pairs of ions are isoelectronic and isostructural?

• A
• B
• C
• D

Question 8

Consider the molecules CH₄, NH₃ and H₂O. Which of the given statements is false?

• AThe H-0-H bond angle in H₂O is larger than the H-C-H bond angle in CH₄
• BThe H-C-H bond angle in CH₄ is larger than the H-N-H bond angle in NH₃
• CThe H-C-H bond angle in CH₄, the H-N-H bond angle in NH₃ and the H-0-H bond angle in H₂O are all greater than 90^o
• DThe H-O-H bond angle in H₂O is smaller than the H-N-H bond angle in NH₃

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