Chemistry – Important Question Bank for Jharkhand class 12th Intermediate (HSC) Board Exam 2017

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1. Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron is 7.87 g cm^-3. Use this information to calculate Avogadro’s number. (Atomic mass of Fe = 56.0 u)

2. Write short notes on –

i) Carbyl Amines reaction

ii) Diazotization

iii) Hoffman’s bromide reaction

iv) Coupling reaction.

3. Write formula of following coordination compounds –

(i) Tetraammine diaqua cobalt III Chloride

(ii) Potassium tetracyanonickelate II

(iii) Tris (Ethane – 1,2-diamine) chromium III chloride

(iv) Ammine bromide chloride nitrate – N- Platinate (II)

(v) Iron III hexacyanoferrate II

4. Give reason –

(i) Reactivity of nitrogen differ from Phosphorus

(ii) Oxygen is gas but sulphur is Solid.

(iii) Halogens are strong Oxidising agent.

(iv) Noble gas have comparatively large atomic size.

5. Copper crystallises with face centred cubic unit cell. If the radius of copper atom is 127.8 pm, calculate the density of copper metal. (Atomic mass of Cu = 63.55 u and Avogadro’s number N_A = 6.02 × 10²³ mol^-1)

6. Attempt following conversions –

I. Acetaldehyde to But – 2- enal

II. Aniline to chlorobenzene

III. 2 – Chlorobutane to 2 – butene.

IV. Toluene to Benzaldehyde

7. (a) How Phenol is Prepared from –

(a) Chlorobenzene (b) Cumene

(b) Write reaction of ethyl alcohol with –

(a) I₂ and alkali (b) PCC

8. (a) Write principle of Oswald process to manufacture Nitric acid ? (b) How nitric acid react with –

(a) Copper (b) Phosphorus

9. (a) How chlorine gas is prepared from

(i) HCl (b) NaCl

(b) Write reaction of chlorine with

(i) NaOH (ii) NH₃ (iii) SO₂

10. A solution of glucose (molar mass = 180 g mol^-1) in water is labeled as 10 % (by mass). What would be the molarity and molarity of the solution ? (Density of solution = 1.2 g mL^-1)

11. Give reason –

(i) (CH₃)₃ P=0 exist but (CH₃)₃ N=0 not.

(ii) Electron gain enthalpy of oxygen is less negative than sulphur.

(iii) H₃PO₂ is stronger reducing agent than H₃PO₃.

12. What is essentially the difference between α – glucose and β – glucose ? What is meant by pyranose structure of glucose ?

13. What are emulsions ? What are their different types? Give one example of each type.

14. Define the following terms :

(i) Nucleotide

(ii) Anomers

(iii) Essential amino acids

15. Complete following reactions –

16. Explain the term –

i) Tyndall effect

ii) Electrophoresis

17.Depict galvanic cell in which the reaction Zn (s) + 2 Ag⁺ (aa)  → Zn2+ (aa) ⁺² Ag (s) take place. Further show –

(i) Which electrode is negatively charged.

(ii) The carrier of the current in cell

(iii) Individual reaction at each electrode

18. Consider the reaction Cr₂0₇^2- + 14H⁺ + 6e ^–→ 2Cr ³⁺ + 7 H₂O       what is the quantity of electricity in coulombs needed to reduce one mole Cr₂O₇ ^2-

19. Write the equation of the reaction at hydrogen iodide with –

(i) 1-Propoxypropane

(ii) Methoxybenzene

(iii) Benzyl ethyl ether

20. What Nucleic acids ? Mention their two important functions ?

21.The conductivity of 0.20M solution of Kcl at 298K is 0.0248 S CM-1. Calculate its molar conductivity ?

22. State Henry’s law ? Mention some of its applications ?

23. Write two main functions of Carbohydrate in Plants ?

24. Write reaction to convert Nitrobenzene to benzoic acid ?

25. Write use of – Tollen’s reagent ,2 4 DNP

26. Why are halogens coloured ?

27. What is Coagulation ?

28. Write the equations involved in the following reactions :

I. Reimer- Tiemann reaction

II. Williamson synthesis

29. Write two different properties of Lanthanides and actinides ?

30 Write the name of monomers used for getting the following polymers –

(i) Teflon

(ii) Buna-N