2nd PUC Chemistry Series 5 December 3, 2020December 23, 2020wefru PUC Science 2nd Year Chemistry Series-5 quiz 0 Created on December 02, 2020 By wefru 2nd PUC Chemistry Series 5 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 41. In the leaching of Ag2S with NaCN, a stream of air is also passed. It is because The reaction between Ag2S and NaCN is reversible. to oxidise Na2S formed in the reaction to Na2SO4. to oxidise Ag2S to Ag2O Both (a) and (b). 2 / 10 42. Purest form of iron is Cast iron Hard Steel Stainless steel Wrought iron 3 / 10 43. H2S is more acidic than H2O because oxygen is more electronegative than sulphur. atomic number of sulphur is higher than oxygen. H — S bond dissociation energy is less as compared to H — O bond. H — O bond dissociation energy is less also compared to H — S bond. 4 / 10 44. The boiling points of hydrides of group 16 are in the order H2O > H2Te > H2S > H2Se H2O > H2S > H2Se > H2Te H2O > H2Te > H2Se > H2S None of these 5 / 10 45. In the manufacture of sulphuric acid by contact process Tyndall box is used to convert SO2 and SO3 test the presence of dust particles filter dust particles remove impurities 6 / 10 46. Fluorine differs from rest of the halogens in some of its properties. This is due to its smaller size and high electronegativity. lack of d-orbitals low bond dissociation energy All of the these. 7 / 10 47. The set with correct order of acidity is HClO < HClO2 < HClO3 < HClO4 HClO4 < HClO3 < HClO2 < HClO HClO < HClO4 < HClO3 < HClO2 HClO4 < HClO2 < HClO3 < HClO 8 / 10 48. When chlorine reacts with cold and dilute solution of sodium hydroxide, it forms Cl– and ClO– Cl– and ClO2– Cl– and ClO3– Cl– and ClO4– 9 / 10 49. The formation of O2+ [PtF6]– is the basis for the formation of first xenon compound. This is because O2 and Xe have different sizes. both O2 and Xe are gases. O2 and Xe have comparable electro-negativities. O2 and Xe have comparable ionisation enthalpies. 10 / 10 50. Partial hydrolysis of XeF4 gives XeO3 XeOF2 XeOF4 XeF2 Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz