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CBSE Class 12 Chemistry Solved Question Paper 2015

Short Answer Type

1. Zn²⁺ salts are white while Cu²⁺ salts are coloured. Why?

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How much charge is required for the reduction of 1 mol of Zn²⁺ to Zn?

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3.
Write the dispersed phase and dispersion medium of butter.

In colloidal dispersion, one substance is dispersed as very fine particles in another substance called dispersion medium. In the case of dust, solid particles are dispersed in air as the dispersion medium.

Dispersed phase: Liquid
Dispersion medium: Solid

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Write the structures of the following molecules:
(i) H₂SO₃
(ii) XeOF₄

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5. Write down the IUPAC name of the complex [Pt(en)₂Cl₂]²⁺. What type of isomerism is shown by this complex?

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Using IUPAC norms write the formulate for the following coordination compounds:

(i) Hexaamminecobalt (III) chloride
(ii) Potassium tetrachloridonickelate (II)

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Define rate of reaction? Write two factors that affect the rate of reaction.

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Arrange the following in increasing order of their basic strength:

(i) C₆H₅ – NH₂, C₆H₅ – CH₂ – NH₂, C₆H₅ – NH – CH₃

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Why does a solution containing non-volatile solute have higher boiling point than the pure solvent? Why is elevation of boiling point a colligative property?

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