Name the basic radicals which are absent, if the given salt is white. In the flame test, sodium imparts yellow colour to the flame while magnesium does not impart any colour. For this reason Fe++ salts are oxidised to Fe+++ salts by boiling with cone. 30. 57. Ans. Ans. 43. 33. HCl in preparing a paste of the salt for flame test ? Explain why ? Hydroxyl group —OH. of CaCO3 changes into soluble calcium bicarbonate and the milkiness, therefore, disappears. Organic compound → Other gaseous products + O2, Percentage of O = ((Molecular mass of O2/Molecular mass of CO2) x (Mass of CO2/Mass of the compound) x 100, Qualitative Analysis Of Organic Compounds, CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions For Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, JEE Main Chapter Wise Questions And Solutions. HNO3 kept in a bottle turn yellow in colour ? NO3–, NO2– and CH3COO–. What type of bond is present in an inorganic salt ? Various books havedifferent approaches, but a systematic approach based on thescheme given below will give good results. Yellow colour in due to dissolved to NO2. The filtrate is sodium carbonate extract or (S.E.). 51. Ans. HCl in a test tube and add KMnO4 soln. Ans. 76. Ans. 13. Even if your compound appears not to dissolve in water, it is a good idea to check the pH of the supernatant. Why are the group V radicals tested in the order Ba. 71. 13. Ans. In the flame test, sodium imparts yellow colour to the flame while magnesium does not impart any colour. Ans. 46. Then, volume of N2 at STP = (P1V1 x 273)/ (760 x T1) = V mL. 55. Ans. dropwise till the pink colour starts persisting. 36. is added along the walls of the tube. Hg(NH2)I. To a part of the soda extract add dil. Sulphur is oxidised to H2SO4 and precipitated as BaSO4. Write the chemistry of flame test. A small amount of the compound may have dissolved and altered the pH. White salts do not form coloured meta-borates. 30. Therefore, the flame appears to be of different colour when viewed through blue glass. The group of atoms that largely determines the properties of an organic compound is called functional group. Ans. The type of analysis that deals with the methods which are used to determine the constituents of a compound… Yes, it is SO2 gas. Its formula is K2[HgI4]. 15. The organic compound is heated with an oxidising agent to oxidise phosphorous to phosphate. Which flame is used in charcoal cavity test ? What is the colour of residue when zinc salt is heated ? H3PO4 + 12(NH4)2MoO4 + 21HNO3 → (NH4)3PO4.12MoO3 + 21NH4NO3 + 12H2O. 6. What is the expected observation when copper sulphate is heated in a dry test tube ? 12.Why a salt containing lead turn black in colour, when placed for a long time in labora-tory? This colour masks the other colours which might be produced during the test. Hence they are precipitated. If the residue in dry heating test is white, name the radicals which are absent. What is qualitative analysis ? 62. Add to this solution NaOH, acetic acid and lead acetate, a yellow ppt. What is aqua regia ? CO2 and Br2 both are brown in colour. The carbon present is oxidised to CO2 and hydrogen to H2O. It is then precipitated as ammonium phosphomolybdate ((NH4)3PO4.12MoO3) by adding NH3 and ammonium molybdate ((NH4)2MoO4). What is a radical ? Name a cation which is not obtained from a metal. Why is platinum metal preferred to other metals for flame test ? Why acetic acid is added before adding lead acetate solution ? 81. Ans. 66. Academia.edu is a platform for academics to share research papers. Ans. Thus, hydrogen ion concentration is increased and consequently the concentration of sulphide ions produced by the ionisation of H2S is sufficiently decreased due to common ion effect. What is the colour of manganese salts ? Ans. Ans. Ferrous salts are usually light green while ferric salts are generally brown. A known mass of the compound is heated with Conc. Ans. H2SO4 is preferred while testing acid radicals over dil. The salt is mixed with the double the quantity of sodium carbonate and the mixture is heated in the charcoal cavity in luminous flame (reducing flame). Ans. Now to this add small amount of CS2 and excess of chlorine water and shake the solution well. Viva Questions with Answers on Qualitative Analysis. 29. How will you test whether the given solution in a bottle is lime water ? S2-, Cl–, Br–, I–, PO43-, SO32-, SO42-. 11. 58. 49. SO2 turns K2Cr2O7 green while CO2 has no effect. 52. 9. There is no definite set procedure that can be generallyapplied to organic qualitative analysis. HCl before proceeding to the test for the basic radicals of group II ? The removal of H+ ions from the solution causes more of H2S to dissociate, thereby increasing the concentration of S2- ions to such an extent that the ionic product of IV group metal sulphides exceeds their solubility product. Ans. H2SO4. Question.2.Name any four functional groups. This is due to formation of NO by decomposition of HNO3 which is further oxidized to NO2. The elements which commonly occur in organic compounds are carbon, hydrogen, oxygen and nitrogen. Cl–, Br–, I–, NO3–, CH3COO–. Describe the chemistry of match stick test. Cu2+, Mn2+, Co2+, Cr3+, Zn2+ and Pb2+. Ans. Excess of cobalt nitrate is avoided because it forms black cobalt oxide in the oxidising flame. Similarly tests of Ca2+ are given by Sr2+ also. All nitrates on heating with cone. Group V—(NH4)2 CO3 in presence of NH4Cl and NH4OH. 7. Before precipitation of group III cations, the solution is boiled with cone, nitric acid. 71. What type of bond is present in an inorganic salt ? change for instance, the compound is considered to be soluble in that solvent. The blue colour is due to the physical adsorption of iodine upon starch. Why do barium salts not impart colour to the flame immediately ?