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

  1. Calculate eqm constant for the Rxn –           4Br- + O2 + 4H+ =           2Br2 +2H2O , E0cell = 0.16V
  2. Which type of solids show following   (1)both Sckottky & Frankel defect. (2) Ferrimagnetism (3)

piezoelectricity (4) Ferroelectricity

  1. Why ZnO looks yellow on heating ?
  2. Give electro chemical theory of corrosion?
  3. 0.01 molol aqueous solution of K3[Fe(CN)6] freezes at –0.062oC. What is the apparent percentage of

dissociation (kf water =1.86 )

  1. Analysis shows that nickel oxide has formula Ni0.98O1.00. What fractions of the nickel exist as Ni2+ and

Ni3+ ions?

  1. 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.?

  1. The activation energy of a 1st 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?

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

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

  1. Of the d4 species, Cr+2 is strongly reducing while Mn +3 is   strongly oxidizing. Explain ?
  2. Write a short note on Lanthanide contraction. Also give consequences ?
  3. What is misch metal ?
  4. Name two transition element showing only one oxidation state ?
  5. Give 2o structure of DNA.
  6. Define – (a) Mutarotatio (b) Zwitter ion (c) gene (d) codon
  7. Prepare Nylon – 6 from cyclohexane.
  8. What are the monomers of –       (a) PMMA (b) Buna – N (c) PAN (d) natureal rubber
  9. Why cane sugar is non reducing ? explain .
  10. Give the method for the synthesis of Phenol formaldehyde resine.
  11. 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 .

  1. Write IUPAC Name of a. [Co(NH3)5ONO]Cl2 b. K3[Cr(CN)6]
  2. Arrange the following in the order of oxidising strength –   ClO4- , BrO4- & IO3-
  3. 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     =

  1. Give the structure of XeOF2 .
  2. Give distinguishing test b/n following – (a) HCOOH & Acitic acid (b) Aniline & phenol  (c) CH3NH2 & CH3CH2NH2
  1. What happen when acetamide is treated with NaOBr ?
  2. Write a short note on (a) Rosenmund reaction   (b) Aldol condensation
  3. Why MnO4- is coloured ?
  4. 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 ?
  1. Which of the following is more acidic – (a) Acetic acid & Benzoic acid (b) Phenol & ethanol

(c) CH3OH & ethanol

  1. Explain the basic character of 10 , 20 , 30 – ethyl amine is more basic & why?
  2. How can we convert following – (a) Nitro ethane to acetic acid   (b) Acetone to tert. butylalcohol
  3. “ Ranitidine is an anta acid “. Comment on the statement.
  4. What is soap chemically ? Why does it not give sufficient lather with hard water ?
  5. What is the function of “equanil “. Give example of broad   spectrum?
  6. What is the disease caused by deficiency of following vitamins – Vit. A , H , K , B12
  7. What is meant by hormones ? What are peptide harmones & their   types ?
  8. What are biopolymer. Give example?
  9. 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 ?

CAPSULE COURSE FOR CLASS XII

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