Subject

Chemistry

Class

ICSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

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 Multiple Choice QuestionsShort Answer Type

21.

i) Write the structure of three ethers with molecular formula C4H10O

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22.

How can the following conversation be brought about:

i) Acetaldehyde to acetaldehyde phenyl hydrazine.
ii) Benzoic acid to aniline.
iii) Methyl chloride to acetone.
iv) Benzene to benzene diazonium chloride.

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23.

i) Glycerol (propane 1,2,3 triol) is more viscous than ethylene glycol ( ethane 1,2, diol). Explain.

ii) How can urea be detected by Biuret test?

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24. Identify space the space compounds space straight A comma space straight B space and space straight C colon
straight i right parenthesis space straight C subscript 2 straight H subscript 5 OH space rightwards arrow with PCl subscript 5 on top space straight A rightwards arrow with KCN on top space straight B space rightwards arrow with straight H subscript 3 straight O to the power of plus on top space straight C subscript 2 straight H subscript 5 COOH space rightwards arrow from increment to NH subscript 3 of space straight C

ii right parenthesis space straight C subscript 6 straight H subscript 5 COOH space rightwards arrow with SOCl subscript 2 on top space straight A rightwards arrow with NH subscript 3 on top space straight B space rightwards arrow with Br subscript 2 divided by KOH on top space straight C


straight i right parenthesis space straight C subscript 2 straight H subscript 5 OH space plus PCl subscript 5 space rightwards arrow stack straight C subscript 2 straight H subscript 5 Cl space with left parenthesis straight A right parenthesis below

stack straight C subscript 2 straight H subscript 5 Cl space with left parenthesis straight A right parenthesis below space plus KCN space rightwards arrow stack CH subscript 3 minus CH subscript 2 CN with left parenthesis straight B right parenthesis below

stack CH subscript 3 minus CH subscript 2 CN with left parenthesis straight B right parenthesis below space plus space straight H subscript 3 straight O to the power of plus space rightwards arrow space CH subscript 3 CH subscript 2 COOH

space CH subscript 3 CH subscript 2 COOH space rightwards arrow from NH subscript 3 to increment of space stack CH subscript 3 CH subscript 2 CONH subscript 2 space with left parenthesis straight C right parenthesis below plus straight H subscript 2 straight O

ii right parenthesis space straight C subscript 6 straight H subscript 5 COOH space rightwards arrow with SOCl subscript 2 on top space straight C subscript 6 straight H subscript 5 COCl space rightwards arrow with NH subscript 3 on top space straight C subscript 6 straight H subscript 5 CONH subscript 2 space rightwards arrow with Br subscript 2 divided by KOH on top space straight C subscript 6 straight H subscript 5 NH subscript 2 space plus CO subscript 2
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25.

Starting with Grignard reagent, how will you prepare propanoic acid?

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26.

What is meant by the lanthanide contraction? write the general electronic configuration of inner transition elements.

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27.

Write the IUPAC names of the following:
i) [CO(NH3)4SO4]NO3
ii) K[Pt(NH3)Cl3]

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28.

The solubility product of PbCl2 at 298K is 1.7 x 10-5. Calculate the solubility of PbCl2 in g/lit. at 298K.

Atomic weight: [Pb=207 and Cl=35.5]

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29.

Graphite is anisotropic with respect to conduction of electric current. explain.

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30.

In a body centred and face centred arrangement of atoms of an element, what will be the number of atoms present in the respective units of cell? Justify your answer with calculation.

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