CBSE Class 12 Chemistry p block elements. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
P - BLOCK ELEMENTS
1.Q.Why does NO2 dimerise?
2.Q.Give chemical reactions involved in brown ring test to confirm nitrates.
3. Q.Give the structure of nitric acid.
4. Q.Give equations in each step of oswald's process
5.Q.Give flow chart for preparation of ammonia by Haber's process.
6.Q.Explain preparation of nitrogen.
7.Q. Why do chromium and aluminium not react with the most oxidizing agent?
8.Q. Name the oxides of nitrogen and give oxidation number of each oxide.
9.Q. Give conditions which favors formation of ammonia as it is a reversible reaction.
10.Q. Draw the structures of white phosphorus and red phosphorus. Which one of these two types of phosphorus is more reactive and why?
11.Q.Whichoxoacids of phosphorus are reducing in nature?
12.Q.Why is phosphorus acid diprotic and phosphoric acid triproticinpite 3 hydrogens in both?
13.Q.Give the structure of oxy acids of phosphorus and list the anions formed.
14.Q.Why does PCl3 fume in moisture?
15 Q.Show that PH3 is basic in nature.
16 Q.Give reason that NCl5 is not formed but PCl5 is formed.
.17.Show that hydrogen peroxide behaves both as an oxidizing and reducing agent.
18.Q.What is oleum? Draw its structure.
19.Q.What happens when sulphur is passed through conc. H2SO4 solution and SO2 is passed through an aqueous solution of Fe(III) salt?
20. Q.Whyare halogens coloured?
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