Model Paper Solution Std 12 Stat_135 | 2022 GSEB Board Sample Paper Solution Statistics Std-12 New

Class 12 Chemistry Chapter 1 Solutions Important Questions | CBSE Board 2020 Quick Revision | Part 2

Hydroxylamine reduces Fe^(3+) accoeding to the following reaction: 2NH_2OH+4Fe^(3+)toH_2O+4Fe^(2+)+4H^(o+)+N_2O Fe^(2+) produced is is estimated by titration with KMnO_4 solution A 10 mL sample of NH_2OH is diluted to 1000 mL. 50 " mL of " this diluted sample is boiled with excess of Fe (III) solution. The resulting solution required 12 " mL of " 0.02 M KMnO_4 for complete oxidation. Determine the strength of NH_2OH .

Class 12 Chemistry Chapter 1 Solutions Important Questions | CBSE Board Quick Revision | Part 1

From 5 litres of a 20% solution of alcohol in water,2 litres of solutionl' is taken out and 2 litres of water is added to it.Find the strength of alcohol in the new solution.10% b.12% c.15% d.18%

Air sample from an industrial town, heavily polluted by CO_(2) was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where CO_(2)(g) was absorbed completely . 25 mL of the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCo_(3)(s) . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization. Weight (in milligrams ) of precipitate BaCO_(3)(s) obtained from the 25 ml of test solution was: [Atomic weight :Ba =137, C=12, O=16]

2.5 g of a sample containing Na_(2)CO_(3) , NaHCO_(3) and some non-volantile impurity on gentle heating loses 12% of its weight. Residue is dissolved in 100 mL water and its 10 mL portion required 15mL 0.1M aqueous solution of BaCl_(2) for complete precipitation of carbonates. Determine mass percentage of Na_(2)CO_(3) in the original sample?