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Science (English Medium) Class 12 - CBSE Question Bank Solutions

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Calculate ΔrG0 and log Kc for the following cell:

\[\ce{Ni(s) + 2Ag^+(aq) -> Ni^{2+}(aq) + 2Ag(s)}\]

Given that \[\ce{E^0_{cell}}\] = 1.05 V, 1F = 96,500 C mol–1.

[2] Electrochemistry
Chapter: [2] Electrochemistry
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Give reasons for the following:

Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.

[9] Amines
Chapter: [9] Amines
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The formula of the complex dichloridobis (ethane –1, 2-diamine) platinum(IV) nitrate is ______.

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
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Write the IUPAC name of the following:

[Co(NH3)5(ONO)]2+

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
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Write the IUPAC name of the following:

K2[NiCl4]

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
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Complete the following ionic equation:

\[\ce{Cr2O^{2-}7 + 2OH^- ->}\]

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
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When D-glucose reacts with HI, it forms ______.

[10] Biomolecules
Chapter: [10] Biomolecules
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In the two tetrahedral structures of dichromate ion, ______.

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
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Which of the following would not be a good choice for reducing nitrobenzene to aniline?

[9] Amines
Chapter: [9] Amines
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Calculate the emf of the following cell at 298 K:

Fe(s) | Fe2+ (0.01 M) | | H+ (1 M) | H2(g) (1 bar) Pt(s)

Given \[\ce{E^0_{cell}}\] = 0.44 V.

[2] Electrochemistry
Chapter: [2] Electrochemistry
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Give the reaction of glucose with hydrogen cyanide. Presence of which group is confirmed by this reaction?

[10] Biomolecules
Chapter: [10] Biomolecules
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Give a reason for the following observations:

Penta-acetate of glucose does not react with hydroxylamine.

[10] Biomolecules
Chapter: [10] Biomolecules
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Amides can be converted into amines by the reaction named ______.

[9] Amines
Chapter: [9] Amines
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Assertion (A): The half-life of a reaction is the time in which the concentration of the reactant is reduced to one-half of its initial concentration.

Reason (R): In first-order kinetics, when the concentration of reactant is doubled, its half-life is doubled.

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
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Complete the reaction mentioning all the products formed:

\[\ce{2KMnO4 ->[\Delta]}\]

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
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Complete the reaction mentioning all the products formed:

\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ ->}\]

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
Concept: undefined >> undefined

Which of the following ions will have a magnetic moment value of 1.73 BM.

\[\ce{Sc^3+, Ti^3+, Ti^2+, Cu^2+, Zn^2+}\]

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
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What is the effect of temperature on the solubility of glucose in water?

[1] Solutions
Chapter: [1] Solutions
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Indicate the steps in the preparation of \[\ce{K2Cr2O2}\] from chromite ore.

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
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Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chomite ore.

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
Concept: undefined >> undefined
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