Way2Freshers

CHEMICAL SCIENCES
This Test Booklet will contain 145 (20 Part `A‟+50 Part `B+75 Part „C‟) Multiple Choice Questions (MCQs). Candidates will be required to answer 15 in part „A‟, 35 in Part „B‟ and 25 questions in Parts C respectively ( No. of question to attempt may vary from exam to exam). In case any candidate answers more than 15, 35 and 25 questions in Parts A, B and C respectively only first 15, 35 and 25 questions in Parts A, B and C respectively will be evaluated. Questions in Parts `A‟ and „B‟ carry two marks each and Part `C‟ questions carry four marks each. There will be negative marking @25% for each wrong answer. Below each question, four alternatives or responses are given. Only one of these alternatives is the „CORRECT‟ answer to the question.

PART A
May be viewed under heading “General Science”

PART B

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. 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

23. Among the three types of orbitals p, d, and f,
1. both p and f orbitals have centre of symmetry
2. both p and d orbitals have centre of symmetry
3. only d orbitals have centre of symmetry
4. f orbitals alone have centre of symmetry

24. The absorbance of solution having 20% transmittance is
1. 0.301
2. 0.699
3. 1.301
4. 1.699

25. The active site of enzyme nitrogenase contains
1. Mo
2. Mn
3. Fe
4. Cu

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