Tuesday, February 18, 2014

What happens when ICSE-2014 Chemistry.




In these questions you are supposed to write a balanced reaction only
You are not supposed to record or give any observations in any of these reactions


What happens when-
1.      Chlorine gas is passed through an aq. solution of potassium iodide.
2.      Zinc Carbonate is heated and liberated gas is passed through lime water.
3.      An aq solution of dil sulphuric acid is electrolyzed between inert electrodes.
4.      Aluminium nitride is treated with hot water.
5.      Manganese dioxide is heated with conc. HCl.
6.      Silver Nitrate solution is treated with dil. HCl.
7.      Lead Nitrate is heated.
8.      Sodium Ethanoate is treated with soda lime
9.      HNO3 is reacted with copper turnings.
10.  HCl has is reacted with heated iron fillings.
11.  Sodium sulphide is reacted with dil HCl.
12.  Sodium sulphite is reacted with dilute HCl.
13.  Excess of ammonia is reacted with Chlorine.
14.  Calcium bi sulphite is reacted with dilute HNO3.
15.  Potassium Oxide is reacted with HNO3
16.  Iron fillings are added to aq. solution of cupric sulphate.
17.  Copper is reacted to dilute sulphuric acid.
18.  Zinc is reacted with dilute nitric acid
19.  Zinc is reacted with extremely dilute nitric acid.
20.  Sodium thiosulphate is reacted with dil.HCl.
21.  Triplumbic tetroxide is reacted with HCl.
22.  Potassium Permanganate is reacted with dil. HCl.
23.  Potassium dichromate is reacted with dilute HCl.
24.  Bleaching Powder is reacted with dil. HCl.
25.  Lead Nitrate is reacted with dilute HCl.
26.  Siver Chloride is reacted with excess of ammonium hydroxide.
27.  Sal ammoniac is reacted with Slaked lime.
28.  Ammonium sulphate is reacted with Sodium hydroxide.
29.  Ammonia is reacted with phosphorus pentoxide in presence of water.
30.  Ammonia in excess is reacted with Calcium chroride.
31.  Aluminium powder is burnt in atmosphere of N2.
32.  Ferrous sulphate is reacted with ammonium hydroxide.
33.  Ferric chloride is reacted with ammonium hydroxide.
34.  Lead Nitrate is reacted with ammonium hydroxide.
35.  Copper sulphate is reacted with excess of Ammonia solution.
36.  Sodium nitrate is reacted with sulphuric acid.
37.  C is reacted with conc. HNO3
38.  S is reacted with conc.HNO3.
39.  P is reacted with conc. HNO3.
40.  Copper sulphite is reacted with dil. Nitric acid.
41.  Copper, Zinc and Iron are separately reacted with excess of dil Nitric Acid.
42.  Mg is reacted with very dilute HNO3.
43.  Toluene is reacted with conc. HNO3.
44.  Hydrogen sulphide is reacted with dilute nitric acid.
45.  Copper Zinc and Iron are reacted with conc. HNO3.
46.  Ferrous sulphate is reacted with nitric acid in presence of sulphuric acid.
47.  Calcium nitrate is heated strongly.
48.  Lead nitrate is heated strongly.
49.  Copper Nitrate is heated strongly
50.  Copper oxide is reacted with ammonia.




Quick revision of Alcohol ICSE 2014

Alcohols
General Formula:       CnH2n +1 OH
Functional Group:       OH
IUPAC Name :             Prefix + Wordroot +primary suffix + secondary suffix (‘ol’)

Methyl Alcohol:           Meth + ane + ol = Methanol.

Laboratory preparation:
·         By reaction of methyl chloride with aq.KOH
CH3Cl + KOH(aq)               Boil            CH3OH + KCl
·         By reaction of methyl bromide with aq.KOH
CH3Br + KOH(aq)           Boil         CH3OH + KBr
The same method can be used to prepare ethanol also-
CH3CH2Cl + KOH(aq)                  Boil         CH3CH2OH + KCl
CH3CH2Br + KOH(aq)                  Boil         CH3CH2OH + KBr

Industrial preparation:
·         By catalytic reduction of water gas-
CO + H2 + H2     Cr2O3 +ZnO, 350 C, 200Atm           CH3OH
·         Industrial preparation of ethyl alcohol-
By hydration of Alkenes-
CH2=CH2 + H2SO4       80 C/ 30atm                 CH3CH2HSO4
                                                        Ethyl Hydrogen sulphate
CH3CH2HSO4   + H2O                               CH3CH2OH + H2SO4
Ethyl Hydrogen sulphate
By fermentation of carbohydrates-
(Fermentation- Anaerobic breakdown of carbohydrates into alcohol and carbon di oxide)
(C6H10O5)Starch + H2O     diastase                                          C12 H22O11
C12 H22O11        + H2O      hydrolysis                                    2C6H12O6
C6H12O6         Zymase            2C2H5OH + 2CO2
Properties-
Physical
Methanol                                                                     Ethanol
Colour                                     Colourless                                                                     Colourless
Taste                                       Burning, poisonous                                                         Burning
Smell                                       Sweet                                                                           Sweet
Solubility                                 Soluble in water                                                             Soluble in water
Boiling point                            64.5oC                                                                           78.3oC
Flammability                           Inflammable                                                                  Inflammable

Chemical
Methanol                                                         Ethanol
With Na metal 2CH3OH + 2Naà2CH3ONa + H2               2CH3 CH2OH + Naà2CH3CH2ONa + H2
With PCl5                     CH3OH + PCl5 à CH3Cl + POCl3 + HCl      CH3 CH2OH + PCl5 àCH3CH2Cl + POCl3 + HCl

ICSE Chemistry 2014 Match the Following for IUPAC



In the questions given below are some of the Trivial Names in Column A and IUPAC Names in Column B. In each of the following draw the structure-

Column A                       Column B
Formaldehyde                   Methanal
Acetone                           Propanone
Butyl Alcohol                    Butanol -1
Isopropyl alcohol              2-methylpropan-2-ol
Ethylene Glycol                 Ethane 1,2diol
Diethyl ether                    Ethoxy ethane
Dimethyl Ether                 Methoxy methane
Acetic Acid                       Ethanoic Acid
Butyric Acid                      Butanoic Acid
Oxalic Acid                       Ethane 1,2 dioic acid
Succinic Acid                    Butanedioic acid
Glutanic Acid                    Pentanedioic acid
Adipic Acid                       Hexanedioc acid
Malonic Acid                     Propanedioic acid
Chloroform                      Trichloromethane
Pyrene                             tetrachloromethane
Formic Acid                      methanoic acid
Acetaldehyde                    Ethanal
Vinyl Alcohol                    Ethenol
Ethylene                          Ethene
Propylene                        Propene
Acetylene                         Ethyne
Marsh Gas                        Methane