ISC 2017 : Chemistry Practical Class XII Question Paper

ISC 2017 Board Chemistry Practical Paper-2 Class12th free sample Question papers of chemistry (Practical) paper-2 2017 are issued by Indian Certificate Of  Secondary Education (i.c.s.e.).ISC 2017 syllabus of chemistry Practical for class 12 ISC important question of 2017 and isc question bank. ISC INDIA CISCE (Council for the Indian School Certificate Examinations).

ISC 2017: Chemistry Exam Board Paper Class XII

ISC 2016-2017: Chemistry (Practical) solved ISC Board Exam paper Class 12th – I.S.C Download Free Online Question Paper. 

The previous year specimen question paper of 2017 chemistry practical and question bank will help to upgrade your ISC 2018 examination results, practice the solved isc board chemistry exam papers of 2016-2017, Last 10 years Question Paper of 2017 and online model answers of chemistry Practical of 2017 are available in the attached sheet in PDF for students and teachers.



 isc 2017 class 12th chemistry Practical question paper
 isc 2017 class 12th chemistry Practical question paper
 isc 2017 class 12th chemistry Practical question paper
 isc 2017 class 12th chemistry Practical question paper


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31 January 2017 at 10:08 delete

titre value was 19.4(varies accordingly to school) percentage purity 90.5(also varies)

c-13 acetone
white crystalline ppt
ruby red colouration that turns pale yellow on heating
yellow precipitate of iodoform
c-14 benzoic acid
gas evolved(CO2) that turns lime water milky
pleasant fruity smell(ester)
buff colour solution

the mixture was zinc and ammonium(cations) chloride and carbonate(anions)
zinc - ash test(pale green) and white precipitate with potassium ferrocyanide and acetic acid(main confirmation) (will get marks for ash test too)
ammonium - nesslers reagent gives brown precipitate
chloride - silver nitrate test (white curdy precipitate soluble in excess of NH4OH) or action with con H2SO4 (formation of gas which gives dense white fumes of NH4CL when a glass rod dipped in con HCL is shown to the mouth of the test tube
carbonate - brisk effervescence of a gas(CO2) which turns lime water milky or barium chloride test of sulphate can also be used to test for carbonate using the soda extract(clear solution)

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31 January 2017 at 10:17 delete

as it is very hard to collect the gas and store it another possible way for making lime water milky is to just blow into a test tube which contains lime water. This may seem risky since it causes a lot of noise and the last thing you wnat to do is get caught. therefore another way is to simply spit a very small amount into the test tube and shake for 5 seconds. This is a sure method if you are sure the anion is carbonate. To check whether it is carbonate just add dil HCL to the mixture. if there is brisk effervescence then carbonate is confirmed or else you can use the barium chloride test. The test is the same as the one for sulphate. take the soda extract and add dil HNO3, boil to expel CO2 and cool. add barium chloride to it. if carbonate is present it becomes a clear solution, if sulphate is present it becomes turbid and it is insoluble in all mineral acids(HCL) if sulphate and carbonate is present it turns into a turbid solution with a white precipitate at the bottom of the test tube. please note this test is only recognised for sulphate by the board and not for carbonate. this is just a test to confirm the presence of carbonate so that you can do the lime water trick which is the actual confirmation of carbonate(to be reported to invigilator)

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Anonymous
1 February 2017 at 00:21 delete

how much marks will be deducted for not calculating molarity upto 4 decimal palaces.

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Anonymous
1 February 2017 at 00:22 delete

how much marks will be deducted for not calculating molarity upto 4 decimal palaces.

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