(Model Paper) CSIR-UGC NET Exam "Chemical Sciences"

CSIR-UGC NET Exam Model Paper

Subject: Chemical Sciences

21. [CoCl4] 2- shows a deep blue colour because of

1. metal to ligand charge transfer transition
2. ligand to metal charge transfer transition
3. spin allowed and Laporte forbidden d-d transition
4. spin allowed and Laporte allowed d-d transition

22. The violet colour of iodine vapour is due to

23. Choose the correct statement among the following

1. diamond has lower thermal and electrical conductivities compared to graphite
2. diamond has similar thermal and electrical conductivities compared to graphite
3. diamond has higher thermal conductivity but lower electrical conductivity compared to graphite
4. diamond has the same thermal but lower electrical conductivity compared to graphite

24. Which of the following is a nido-borane?

1. B4H10
2. B5H9
3. [B6H6] 2-
4. B5H11

25. The oxidation number of sulphur in dithionite [S2O4] 2-and dithionate [S2O6] 2- are, respectively,

1. +3 and +4
2. +3 and +5
3. +4 and +5
4. +4 and +6

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