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Science (English Medium) Class 11 - CBSE Question Bank Solutions

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What will be the product obtained as a result of the following reaction and why?

[9] Hydrocarbons
Chapter: [9] Hydrocarbons
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Suggest a route for the preparation of nitrobenzene starting from acetylene?

[9] Hydrocarbons
Chapter: [9] Hydrocarbons
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Match the following reactants in Column I with the corresponding reaction products in Column II.

Column I Column II
(i) \[\ce{Benzene + Cl2 ->[AlCl3]}\] (a) Benzoic acid
(ii) \[\ce{Benzene + CH3Cl ->[AlCl3]}\] (b) Methyl phenyl ketone
(iii) \[\ce{Benzene + CH3COCl ->[AlCl3]}\] (c) Toluene
(iv) \[\ce{Toluene  ->[KMnO4/NaOH]}\] (d) Chlorobenzene
  (e) Benzene hexachloride
[9] Hydrocarbons
Chapter: [9] Hydrocarbons
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Which atom is indicated by the following configuration?

[He] 2s1

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Which atom is indicated by the following configuration?

[Ne] 3s2 3p3

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Which atom is indicated by the following configuration? 

[Ar] 4s2 3d1.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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An atomic orbital has n = 3. What are the possible values of l and ml?

[2] Structure of Atom
Chapter: [2] Structure of Atom
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List the quantum numbers (ml and l) of electrons for 3d orbital.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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 Which of the following orbitals are possible?

1p, 2s, 2p and 3f

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Indicate the number of unpaired electrons in a P.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Indicate the number of unpaired electrons in Si.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Indicate the number of unpaired electrons in Cr.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Indicate the number of unpaired electrons in Fe.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Indicate the number of unpaired electrons in Kr.

[2] Structure of Atom
Chapter: [2] Structure of Atom
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Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

[4] Chemical Bonding and Molecular Structure
Chapter: [4] Chemical Bonding and Molecular Structure
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Discuss the chemistry of Lassaigne’s test.

[8] Organic Chemistry - Some Basic Principles and Techniques
Chapter: [8] Organic Chemistry - Some Basic Principles and Techniques
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Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

[8] Organic Chemistry - Some Basic Principles and Techniques
Chapter: [8] Organic Chemistry - Some Basic Principles and Techniques
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The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10–3 M. what is its pH?

[6] Equilibrium
Chapter: [6] Equilibrium
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The pH of a sample of vinegar is 3.76. Calculate the concentration of hydrogen ion in it.

[6] Equilibrium
Chapter: [6] Equilibrium
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It has been found that the pH of a 0.01M solution of an organic acid is 4.15. Calculate the concentration of the anion, the ionization constant of the acid and its pKa.

[6] Equilibrium
Chapter: [6] Equilibrium
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