CBSE Class 12 Chemistry The 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.
ONE MARK QUESTIONS
1.Why does NO2 dimerise? (2010)
2.Fluorine does not exhibit any positive oxidation state. Why? (2010)
3.What happens when H3PO3 is heated?
4.Name a compound in which chlorine displays ‘+7’ oxidation number.
5.On heating Cu turnings with conc. HNO3, a brown coloured gas is evolved which on cooling dimerises. Identify the gas. (2016)
1. Explain why
a) Noble gases form compounds with oxygen and fluorine only.
b) Unlike phosphorous, nitrogen has no tendency for catenation.
2.Complete the following reactions:
a) Zn + HNO3(conc.) →
b) Cl2 + NaOH (hot, Con) →
3.Give equations for the manufacture of a) Ammonia from nitrogen b) Nitric acid from ammonia
1.Arrange the following in order of the property mentioned.
a) HF, HCl, HBr, HI (increasing acid strength)
b) NH3, PH3, AsH3, SbH3 (increasing basic strength)
c) HOCl, HOClO, HOClO3 (increasing oxidizing power) (2010)
2.What are interhalogen compounds? How are they prepared? Why are they more reactive than molecular halogens?
a) H2S is gas while water is liquid at room temperature.
b) Helium is used in diving apparatus.
c) Iron dissolves in HCl to form FeCl2 and not FeCl3. (2009)
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