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#### Sample 5 Mark Book Back Questions (New Syllabus) 2020

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 95

Part A

19 x 5 = 95
1. Give the limitations of Ellingham diagram

2. How will you identify borate radical?

3. Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

4. Which is stronger reducing agent Cr2+ or Fe2+?

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

6. Write the oxidation state, coordination number , nature of ligand, magnetic property and electronic configuration in octahedral crystal field for the complex K4[Mn(CN)6]

7. An atom crystallizes in fcc crystal lattice and has a density of 103 gcm−3 with unit cell edge length of 100pm. calculate the number of atoms present in 1 g of crystal.

8. A zero order reaction is 20% complete in 20 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?

9. Write the expression for the solubility product of Ca3 (PO4)2

10. Calculate i) the hydrolysis constant, ii) degree of hydrolysis and iii) pH of 0.1M CH3COONa solution (pKa for CH3COOH is 4.74).

11. The same amount of electricity was passed through two separate electrolytic cells containing solutions of nickel nitrate and chromium nitrate respectively. If 2.935g of Ni was deposited in the first cell. The amount of Cr deposited in the another cell? Give : molar mass of Nickel and chromium are 58.74 and 52gm-1 respectively.

12. Give three uses of emulsions.

13. Write a note on electro osmosis

14. What is the difference between homogenous and hetrogenous catalysis?

15. An organic compound (A) molecular formula CH2O reacts with CH3MgI to give compound (B). Compound (B) liberates Hydrogen with metallic sodium. Compound (B) in the presence of Con. H2SO4 at 410 K on dehydration to give compound (C) molecular formula C4H10O. Identify (A), (B) and (C). Explain the above reactions.

16. Complete the following reaction
${ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { HO-{ CH }_{ 2 }-{ CH }_{ 2 }-OH }{ \underset { { H }^{ + } }{ \longrightarrow } } ?$

17. Indentify A,B,C and D
aniline+benzaldehyde $\longrightarrow$ A  $\overset { {con} { } {HNO}_{ 3 } }{ \underset { {} }{ \longrightarrow } }$

18. What are different types of RNA which are found in cell

19. What are anti fertility drugs? Give examples.