Subject

Chemistry

Class

ICSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

31.

Give balanced equations for the following reactions:

(i) Acidified potassium permanganate and oxalic acid.

(ii) Ozone and mercury.

(iii) Action of heat on a mixture of sodium chloride and concentrated sulphuric acid.

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32.  Explain why transition metals form complex compounds.


Transition metals are d-block elements. They have valence shell configuration of ns2 (n - 1) d1-10 These metals and their ions easily coordinate to a number of negative ions or neutral molecules having ions pairs of electrons of form complex. This is because of their

(i) Small size and high nuclear charge.

(ii) Availability of vacant d-orbitals of suitable energy to accommodate lone pairs of electrons donated by the ligands.

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33.

 (i) What is the hybridisation of the chlorine atom in CIF3 molecule?

(ii) Draw the structure of the molecule and state its geometry.

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34.

Name the inert gases used for:

(i) Filling sodium vapour lamps.

(ii) Obtaining light of different colours in neon signs.

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35.

How can the following conversions be brought about:

(i) Ethanol to methylamine.

(ii) Benzene to phenol.

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36.

Complete the following reactions and name the reactions:
(i)__________+312+4KOH CHI3 + CH3COOK + 3KI + 3H2O

ii) straight C subscript 3 straight H subscript 7 NH subscript 2 space plus CHCl subscript 3 space plus 3 KOH space rightwards arrow with Heat space on top space _______ space plus 3 KCl space plus 3 straight H subscript 2 straight O

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37.

Name the type of polymerisation (addition or condensation) and name the monomers in each of the following polymers:

(i) Protein    
(ii) Polyethylene

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38.

(i)What type of isomers are glucose and fructose?

(ii)Name the functional group common to both glucose and fructose,

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39.

(i) Identify the products A, B and C:

(ii) Identify the reagents X, Y and Z.

straight C subscript 2 straight H subscript 5 Cl space rightwards arrow with straight X on top space straight C subscript 2 straight H subscript 5 CN space rightwards arrow with straight Y on top space straight C subscript 2 straight H subscript 5 CH subscript 2 NH subscript 2 space rightwards arrow with straight Z on top space straight C subscript 2 straight H subscript 5 CH subscript 2 NHCOCH subscript 3

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40.

 Give balanced equations for the following reactions:

(i) Benzaldehyde and Hydroxylamine.

(ii) Benzoic acid and phosphorous pentachloride.

(iii) l-butanol and Hydrogen chloride.

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