Class 11th

The maximum number of electrons in a sub-shell is given by the equation
(a) n²(b) 2n²(c) 2l – 1 (d) 2l + 1

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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(d) 2l + 1

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Arrange the halogens F₂, Cl₂, Br₂, I₂, in order of their increasing reactivity with alkanes.

(i) I₂< Br₂< Cl₂< F₂

(ii) Br₂< Cl₂< F₂< I₂

(iii) F₂< Cl₂< Br₂< I₂

(iv) Br₂< I₂< Cl₂< F₂

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(i) I₂< Br₂< Cl₂< F₂

The reactivity of halogens with alkanes depends on the electronegativity i.e. higher the electronegativity higher would be the reaction. As down the group reactivity decrease so thus its reactivity.

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The energy needed to remove a single electron (most loosely bound) from an isolated – gaseous atom is called
(a) Ionisation energy (b) Electronegativity

(c) Kinetic energy (d) Electron affinity

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(a) ionisation energy

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What is value of Planck's constant in S.I. units?

(a) 6.62 x 10²⁴Js (b) 6.62 x 10³⁴Js (c) 6.62 x 10^-24Js (d) 6.62 x 10^-34Js

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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(d) 6.62 x 10^-34Js

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Arrange the following in decreasing order of their boiling points.

(A) n–butane

(B) 2–methylbutane

(C) n-pentane

(D) 2,2–dimethylpropane

(i) A > B > C > D

(ii) B > C > D > A

(iii) D > C > B > A

(iv) C > B > D > A

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(iv) C > B > D > A

The boiling point increases with the increase in the length of the side chain. However, with the branching, the boiling point decreases due to the decrease in the surface area.

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Which element does not have any neutron?

(a) Li (b) C (c) H (d) B

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

Which element does not have any neutron?

(a) Li (b) C (c) H (d) B

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An alkane C₈H₁₈ is obtained as the only product on subjecting a primary alkyl halide to Wurtz reaction. On monobromination this alkane yields a single isomer of a tertiary bromide. Write the structure of alkane and the tertiary bromide.

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The reaction is

The alkane is

The tertiary bromide is

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Which one of the following statements is correct?

(a) Fe³⁺ is more paramagnetic than Fe²⁺.

(b) Fe²⁺ is more paramagnetic than Fe³⁺.

(c) Both are equally paramagnetic.

(d) They are non-magnetic.

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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(a) As Fe³⁺ contains 5 impaired electrons while Fe²⁺ contains only 4 unpaired electrons. Fe³⁺ is more paramagnetic.

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Write hydrocarbon radicals that can be formed as intermediates during monochlorination of 2-methylpropane? Which of them is more stable? Give reasons

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