Chemistry: Optically Active Compound
CHEMISTRY SAMPLE PAPER - I
CLASS - XII
Time : Three Hours Max. Marks : 70
General Instructions
1. All questions are compulsory.
2. Question nos. 1 to 8 are very short answer questions and carry 1 mark each.
3. Question nos. 9 to 18 are short answer questions and carry 2 marks each.
4. Question nos. 19 to 27 are also short answer questions and carry 3 marks each
5. Question nos. 28 to 30 are long answer questions and carry 5 marks each
6. Use log tables if necessary, use of calculators is not allowed.
(1) Why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding? 1
(2) Why does a tetrahedral complex of the type [MA2 B2] not show geometrical isomerism? 1
(3) How do you account for the miscibility of ethoxyethane with water. 1
(4) Give the IUPAC name of the organic compound 1
O
II
(CH3)2 C CH C CH3
= − −
(5) Name the monomers of nylon 2 or nylon 6 ploymer. 1
(6) Give one example of an artificial sweetener used by the diabetic patients. 1
(7) Direct nitration of aniline is not carried out. Explain why? 1
(8) What type of linkage holds together the monomers of D.N.A.? 1
(9) Examine the illustration of a portion of the defective crystal given below and answer the following questions.
(5)
(i) What are these type of vacancy defects called?
(ii) How is the density of a crystal affected by these defects?
(iii) Name one ionic compound which can show this type of defect in the crystalline state
(iv) How is the stoichiometry of the compound affected? 2
10. Analysis shows that a metal oxide has the empirical formula M0.96 O1.00. Calculate the percentage of M2+ and M3+ ions in this crystal? 2
OR
In an ionic compound the anion (N¯) form cubic close type of packing. While the cation (M+) ions occupy one third of the tetrahedral voids. Deduce the empirical formula of the compound and the coordination number of (M+) ions. 2
11. Given below is the sketch of a plant for carrying out a process.
(i) Name the process
CLASS - XII
Time : Three Hours Max. Marks : 70
General Instructions
1. All questions are compulsory.
2. Question nos. 1 to 8 are very short answer questions and carry 1 mark each.
3. Question nos. 9 to 18 are short answer questions and carry 2 marks each.
4. Question nos. 19 to 27 are also short answer questions and carry 3 marks each
5. Question nos. 28 to 30 are long answer questions and carry 5 marks each
6. Use log tables if necessary, use of calculators is not allowed.
(1) Why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding? 1
(2) Why does a tetrahedral complex of the type [MA2 B2] not show geometrical isomerism? 1
(3) How do you account for the miscibility of ethoxyethane with water. 1
(4) Give the IUPAC name of the organic compound 1
O
II
(CH3)2 C CH C CH3
= − −
(5) Name the monomers of nylon 2 or nylon 6 ploymer. 1
(6) Give one example of an artificial sweetener used by the diabetic patients. 1
(7) Direct nitration of aniline is not carried out. Explain why? 1
(8) What type of linkage holds together the monomers of D.N.A.? 1
(9) Examine the illustration of a portion of the defective crystal given below and answer the following questions.
(5)
(i) What are these type of vacancy defects called?
(ii) How is the density of a crystal affected by these defects?
(iii) Name one ionic compound which can show this type of defect in the crystalline state
(iv) How is the stoichiometry of the compound affected? 2
10. Analysis shows that a metal oxide has the empirical formula M0.96 O1.00. Calculate the percentage of M2+ and M3+ ions in this crystal? 2
OR
In an ionic compound the anion (N¯) form cubic close type of packing. While the cation (M+) ions occupy one third of the tetrahedral voids. Deduce the empirical formula of the compound and the coordination number of (M+) ions. 2
11. Given below is the sketch of a plant for carrying out a process.
(i) Name the process