Chemistry – Important Question Bank for Kerala HSE 2016 Examination

1.(A) Antibiotics are classified in to board spectrum antibiotics and narrow spectrum antibiotics. Write one example each for these antibiotics

(B) Write one similarity and one difference antiseptics and disinfectants

2. Freons are known with respect to ozone layer depletion

i. what are freons?

ii. How can you prepare a Freon from CCl₄

3. How can your separate the following mixtures?

i. Napthalene, Urea

ii. Anthralene, Benzoic acid

iii. Chloroform, Aniline

vi. Water, Kerosene

4. Sols are colloidal systems in which dispersion medium is liquid and dispersed phase is solid

i. write any four differences between lyophilic sols and lyophobic sols.

ii. peptisation is a method of preparation of sols. Write a general procedure for peptisation

5.  Calcinations and roasting are pre treatments in metallurgy before metal extraction. Differentiate between Calcinations and roasting.

6. Petrol having an octane number 80 or above is used in motor vehicles

i.  explain the significance of octane number in grading petrol.

ii. write down the name of an anti knocking agent use in petrol

iii. what is the corresponding property for measuring efficiency of diesel?

7. C₂H₆ and C₅H₁₂ are members of a homologous series

i. what is a homologous series?

ii. what is the general molecular formula of the above homologous series?

iii. what is the significance of CH₂ group in homologous series?

8. Every substance has some magnetic properties associated with it. How will you account for the following magnetic properties?

i. Paramagnetic property

ii. Ferromagnetic property

9. A compound is formed by two elements P and Q. atoms of Q (as anions) make hcp lattice and those of the element P (as cations) occupy all tetrahedral voids. What is the formula of the compound?

10. Osmotic pressure is a colligative property and it is proportional to the molarity of solution

i. what is osmotic pressure?

ii. Molecular mass of NaCl determined by osmotic pressure measurement is found to be half of the actual value account for it

iii. . calculate the osmotic pressure exerted by a solution prepared by dissolving 1.5g of a polymer of molar mass 185000 in 500 ml of water at 37ᴼ C. [R = 0.0821 L atm K^-1 mol^-1].

11.  Write a method of preparation of primary amines

i. Describe a chemical reaction given only by primary amines

ii. what is diazotization?

12. Biomolecules are formed by certain specific linkages between simple monomeric units. Write the names of linkages and monomeric units in the following class of biomolecules.

i. starch

ii. protein

iii. nucleic acid

13. Solutions exhibit certain colligative properties such as elevation in boiling point (BP), depression in freezing point, osmotic pressure (OP).

(a) 10 g of an organic substance is dissolved in two liters of water at 280 K. find out the molar mass of the substance if OP if the solution is 0.059 atmospheres

(b) cold Ethylene glycol is added to radiator water in vehicles. Which colligative property of water is involved in doing this?

i. elevation of BP

ii. osmotic pressure

iii. depression in freezing point

14. A compound is formed between oxygen and fluorine. Do you know whether it is oxygen fluoride or fluorine oxide? Explain.

b. NO and HNO₃ are two compounds of N. in which of the is N more oxidized?

15. (a) Write any tow difference between step growth polymersation and chain growth polmerisation

(b) what are the monomers of the following

i. Neoprene

ii. Nylon – 6

16. (a) write a method of preparation of primary amines.

(b) describe a chemical reaction given only by primary amines

(c) what is diazotization

17. (a) How will you prepare the following compounds using Grignard reagent?

i. Primary alcohol

ii. secondary alcohol

(b)  How will you distinguish primary and secondary alcohols using Luca’s test?

(c) Write the correct pair of reactants for the preparation of t-butyle ethyle ether by Williamson synthesis

18. . Most important chemical reactions of halo alkanes are their substitution reactions.

i. what is S_N1 reaction?

ii. Arrange the four isomeric bromo butanes in the increasing order of their reactivity towards S_N1 reaction

(b) How will you prepare chlorobenzene from benzene diazonium chloride?

19. (a) consider a general reaction aA + bB → cC +dD  the rate expression for the reaction is Rate = K[A]^x[B]^y

i. establish the significance of ‘(a + b)’ and ‘(x + y)’ in terms of order and molecularity

ii. write any two differences between order and molecularity

(b) . “Reactions with zero order is possible, but zero molecularity is not” Justify  the statement

20.  Potassium dichromate is an orange colored crystal and is an important compound used as an oxidant in many reactions

i. How do you prepare K₂ Cr₂ O₇ form chromites ore?

ii. How will you account for the colour of potassium dichromate crystals

21. Compounds of nitrogen, phosphorus and sulphur such as ammonia, phosphoric acid and sulphuric acid are used in fertilizer Industry.

i. describe Haber process for the manufacture of ammonia

ii. write the chemical equation for the preparation of phosphoric acid (H₃PO₄) from Orthophosphorus acid (H₃PO₃)

iii. describe contact process for the manufacture of sulpuric acid

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