12th Chemistry Important Questions 2022

12th Chemistry Important Questions 2022

பன்னிரண்டாம் வகுப்பு வேதியல் முக்கியமான வினாக்கள் 2022 

12th Chemistry Important Questions 2022

Unit 1 Metallurgy

1.What are the differences between minerals and ores?

2.What is the role of Limestone in the extraction of Iron from its oxide Fe2 3 O ?

3.Explain zone refining process with an example.

4.Give the uses of zinc

5.Explain the electrometallurgy of aluminium.

6.Give the limitations of Ellingham diagram.

7.Write a short note on electrochemical principles of metallurgy.

Unit 2 p block elements – 1

1.Describe briefly allotropism in p- block elements with specific reference to carbon.

2.Give the uses of Borax.

3.Describe the structure of diborane.

4.Write a short note on hydroboration.

5.Write a note on zeolites.

6.CO is a reducing agent. justify with an example.

Unit 3 p-BLOCKE ELEMENTS- II

1.What is inert pair effect?

2.Explain why fluorine always exhibit an oxidation state of -1?

3.What are interhalogen compounds? Give examples.

4.Give the uses of helium.

5.Why fluorine is more reactive than other halogens?

6.Give the uses of sulphuric acid.

7.Give the uses of argon.

8.Give a reaction between nitric acid and a basic oxide.

9.What type of hybridisation occur in

a) BrF5

 b) BrF3

Unit 4 TRANSITION ANDI INNERTRANSITIONE ELEMENTS

1.What are transition metals? Give four examples.

2.What are inner transition elements?

3.Justify the position of lanthanides and actinides in the periodic table.

4.What are interstitial compounds?

5.Calculate the number of unpaired electrons in Ti3+ , Mn2+ and calculate the spin onlym magneticmoment.

6.Compare lanthanides and actinides.

7.Actinoid contraction is greater from element to element than the lanthanoid contraction,why?

8.Why first ionization enthalpy of chromium is lower than that of zinc?

Unit 5 COORDINATION

CHEMISTRY

1.Give an example of coordination compound used in medicine and two examples ofbbiologicallyimportant coordination compounds.

2.In an octahedral crystal field, draw the figure to show splitting of d orbitals.

3.What is linkage isomerism? Explain with an example.

4.Give the difference between double salts and coordination compounds.

5.Write the postulates of Werner’s theory

6.What are hydrate isomers? Explain with an example.

7.What is crystal field stabilization energy (CFSE) ?

8.Discuss briefly the nature of bonding in metal carbonyls.

9.What are the limitations of VB theory?

10.What is crystal field splitting energy?

Unit 6 SOLID STATE

1.Define unit cell.

2.Explain briefly seven types of unit cell.

3.Distinguish tetrahedral and octahedral voids.

4.What are point defects?

5.Explain Schottky defect.

6.11.Calculate the number of atoms in a fcc unit cell.

7.Why ionic crystals are hard and brittle?

8.What is meant by the term “coordination number”? What is the coordination number

of atoms in a bcc structure?

9.Write a note on Frenkel defect.