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I LILftYATIBAl PODltR Bl&B SQIOOL- ISC PULIIDRAlll1EXAM1R1tnoN 102s-M SUBJB.CT: CBEMlsnti mm -!HOURS- . &RADR:to llltRKS:&o Instructions You will not be allowed to write during the ftrst 1S minutes. This time is to be spent in reading the question paper. ,._ ( .n-......... A an ur om -~~J The intended marks for questions or parts of questions are given in brae ~~41]. . # ' ~SECTION A r~ . (Attempt all questions from this sectio'n(,~'v ~>J . [15] Question 1 _ + ' Choose one correct answer to the questions from the given opti{ts~(~., i. electrolysis of compound P. gives silvery grey me~~bde and reddish brown fume~ at anode . Appropria~e conditions of ele~?~;~ . a. P : molten lead bromide . cathode; l(a~ anode : coppe~ b. P : aqueous lead bromide .cathod~,~di anode : graphite 1 c.. P : molten lead chloride catho~'"\.: anode : graphite P : molten lead bromide c td~~n anode : graphite . u. Salt A on ~eating with copper ~sc_ sulphuric acr.d gives reddish brown . fumes and give~ dirty green~; . insoluble with e_xcess of ammonium hydroxide. S~t A is a. Ferric sulphate b. Ferric nitrate ( c. Ferrous nitrat ,~.,~ ~, _.,, Ferrous sulphate Which of them w iii. ost ( atomic weights: H =1, C = 12, N. 14, 0 =16, S= 32] Avagadro . . .~. x 10 13 a. 18 x les of water --l1: 1.25 moles of carbon dioxide .. c. ulphu~c acid d. 67.2 L of ammonia The o ~ reduced product when ammonia is treated with copper (II) oxide iv. ar~ '\)~~ ., '"-., ~ ~ s e d ptoduct : Cu. Reduced product : N2 ~"oxidised product : Cu ~duced product : H20 , c. Oxidised product : N2 Reduced product : Cu d. Oxidised prod~ct -~ lliO Reduced product : N~ v. The name and formulae of the compound when sulphur trioxide reacts with concentrated sulphuric aci~ is a. Metasulphurous acid , H2Sz07 b. Pyrosulphurous acid, H2S03 ~Oleum,H252 0 d. Oleum , H2S20s This paper consist of 7 printed sides . - ' ! : ~ .... o~.2 ~, Page 1 of 7
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