CBSE Class 12 Chemistry Question Paper Solved 2019 Set O

CBSE Class 12 Chemistry Question Paper Solved 2019 Set O. 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. A cube solid is made up of two elements A and B. Element A forms hcp while atoms of element B occupy two-third of the octahedral voids. What is the formula of the solid ?

2. What type of isomerism is shown by complex [Co(NH₃)5Cl]SO₄ ?

OR

Arrange the following in increasing order of crystal field splitting energy :

[Cr(CN)₆]^3–, [Cr(NH₃)₆]³⁺, [CrCl₆]^3–

3. Oxidation of CH₃ – CHO is easier than CH₃ – COCH₃. Why ?

4. Write the IUPAC name of the following compound :

5. How will you prepare arsenic sulphide sol in the lab ?

OR

Give an example of heterogeneous catalysis.

SECTION B

6. What happens when

(a) XeF₂ is hydrolysed ?

(b) SO₂ is passed into aqueous solution of Fe³⁺ salt ?

7. Show that for a first order reaction, time required for completion of 99%

of reaction is twice the time required for completion of 90% of reaction.

8. What happens when D-glucose is treated with the following ? Give equations to support your answer.

(a) HI

(b) HNO₃

OR 

Give any two points of difference between globular and fibrous proteins. 

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