Chemistry:XII-Mock Test for Board Exams

1.The electric resistance of a column of 0.05M NaOH solⁿ of diameter 1cm & length 50 cm is 5.55X10³ ohm.

Calculate its ٨m

2. Calculate eq^m constant for the Rxⁿ –           4Br^- + O₂ + 4H⁺ =           2Br₂ +2H₂O , E⁰_cell = 0.16V
3. Which type of solids show following   (1)both Sckottky & Frankel defect. (2) Ferrimagnetism (3)

piezoelectricity (4) Ferroelectricity

4. Why ZnO looks yellow on heating ?
5. Give electro chemical theory of corrosion?
6. 0.01 molol aqueous solution of K₃[Fe(CN)₆] freezes at –0.062^oC. What is the apparent percentage of

dissociation (k_f water =1.86 )

7. Analysis shows that nickel oxide has formula Ni_0.98O_1.00. What fractions of the nickel exist as Ni²⁺ and

Ni³⁺ ions?

8. Why we add salt to the snow on the roads?

9.The half life period of a first order reaction is 600 s . What percent of A remain after 30 min.?

10. The activation energy of a 1^st order reaction at 300 K is 60 KJ/mol. In the presence of catalyst the

activation energy lowered to 50 KJ/mol at 300K. How many times the reaction gets change in the

presence of catalyst at same temperature?

11. Conductivity of 0.00241 M acetic acid is 7.896 x 10^-5 S cm^-1 . Calculate its molar conductivity   and ifΛ^o

for acetic acid is 390 .5 S cm² mol^-1 , what is its dissociation constant ?

12. Of the d⁴ species, Cr⁺² is strongly reducing while Mn ⁺³ is   strongly oxidizing. Explain ?
13. Write a short note on Lanthanide contraction. Also give consequences ?
14. What is misch metal ?
15. Name two transition element showing only one oxidation state ?
16. Give 2^o structure of DNA.
17. Define – (a) Mutarotatio (b) Zwitter ion (c) gene (d) codon
18. Prepare Nylon – 6 from cyclohexane.
19. What are the monomers of –       (a) PMMA (b) Buna – N (c) PAN (d) natureal rubber
20. Why cane sugar is non reducing ? explain .
21. Give the method for the synthesis of Phenol formaldehyde resine.
22. Explain following -   1.[Sc(H₂O)₆]⁺³ is colorless & [Ti(H₂O)₆]⁺³ is colored.     2.[Ni(H₂O )₄]³ is coloured &

[Ni(CN)₄]³ is colourless.

23.Account for the following : [Cr(NH₃)₆]³⁺ is   paramagnetic and octahedral whereas [Ni(CN)₄]^2- is

diamagnetic and square planer .

24. Write IUPAC Name of a. [Co(NH₃)₅ONO]Cl₂ b. K₃[Cr(CN)₆]
25. Arrange the following in the order of oxidising strength –   ClO₄^- , BrO₄^- & IO₃^-
26. Arrange the following in the order of acidic strength – (a) HClO , HClO₂ , HClO₃, HClO₄

(b) HI , HBr . HCl

27.Complete the following eqⁿ –

(a) BrO₃^- + F₂ + OH^-   =             (b) Ca₃P₂ + H₂O     =

28. Give the structure of XeOF₂ .
29. Give distinguishing test b/n following – (a) HCOOH & Acitic acid (b) Aniline & phenol  (c) CH₃NH₂ & CH₃CH₂NH₂

30. What happen when acetamide is treated with NaOBr ?
31. Write a short note on (a) Rosenmund reaction   (b) Aldol condensation
32. Why MnO₄^- is coloured ?
33. An element has d of 19.35 gm/c.c. and length of side of unit cell   is 316 pm. The unit cell is b.c.c. How  many atoms of element does 50 gm of element contain ?

34. Which of the following is more acidic – (a) Acetic acid & Benzoic acid (b) Phenol & ethanol

(c) CH₃OH & ethanol

35. Explain the basic character of 1⁰ , 2⁰ , 3⁰ – ethyl amine is more basic & why?
36. How can we convert following – (a) Nitro ethane to acetic acid   (b) Acetone to tert. butylalcohol
37. “ Ranitidine is an anta acid “. Comment on the statement.
38. What is soap chemically ? Why does it not give sufficient lather with hard water ?
39. What is the function of “equanil “. Give example of broad   spectrum?
40. What is the disease caused by deficiency of following vitamins – Vit. A , H , K , B₁₂
41. What is meant by hormones ? What are peptide harmones & their   types ?
42. What are biopolymer. Give example?
43. Write short note on – (a) Van-de-arkel method (b) Aluminothermy (b) Illingham diagram

Or

Give the various steps involve in the extraction of Fe from hematite ore ?