CBSE Class 12 Chemistry Question Paper Solved 2019 Set L

CBSE Class 12 Chemistry Question Paper Solved 2019 Set L. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. What is the coordination number of atoms in a (i) bcc structure, and (ii) fcc structure ?

2. Why are powdered substances more effective adsorbents than their crystalline forms ?

3. When a coordination compound CrCl₃ . 6H₂O is mixed with AgNO₃, two moles of AgCl are precipitated per mole of the compound. What is the structural formula of the coordination compound ?

OR

What is the difference between a complex and a double salt ?

4. Which alkyl halide from the following pair would you expect to react more rapidly by an S_N2 mechanism ?

5. Write the reaction involved in the Hoffmann bromamide degradation reaction.

OR

Propanamine and N,N-dimethylmethanamine contain the same number of carbon atoms, even though Propanamine has higher boiling point than N,N-dimethylmethanamine. Why ?

SECTION B

6. When dilute ferrous sulphate solution is added to an aqueous solution containing nitrate ion followed by careful addition of concentrated sulphuric acid along the sides of test tube, a brown ring is formed at the interface between the solution and sulphuric acid layers. Which anion is confirmed by the appearance of brown ring ? What is the composition of the brown ring ?

OR

How can you prepare Cl₂ from HCl and HCl from Cl₂ ? Write reactions only.

7. Define electrochemical cell. What happens when applied external potential becomes greater than o cell E of electrochemical cell ?

8. Give reasons for the following :

(a) Aquatic species are more comfortable in cold water than warm water.

(b) At higher altitudes people suffer from anoxia resulting in inability to think.

OR

What type of azeotropic mixture will be formed by a solution of acetone and chloroform ? Justify on the basis of strength of intermolecular interactions that develop in the solution. 

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