BSEB Intermediate Chemistry case studies
BSEB Intermediate Chemistry · Put your knowledge to work in context.
The Bihar School Examination Board (BSEB) Intermediate Chemistry examination is the Class 12 chemistry assessment for students enrolled in the Bihar higher secondary system. It is intended for candidates who have completed the Intermediate first year (Class 11) and are seeking certification to pursue undergraduate science programmes, entrance examinations such as NEET and JEE, or vocational pathways. The BSEB Intermediate Chemistry case studies are 5 cases and about 4,116 words.
1Ranking Four Solutions Without a Thermometer
In a winter practical class at a Patna college, four solutions are prepared and left in the same ice–salt bath: (A) 1.80 g of glucose (M = 180 g mol⁻¹) dissolved in 100 g of water; (B) 0.585 g of sodium chloride (M = 58.5 g mol⁻¹) in 100 g of water; (C) 0.600 g of urea (M = 60 g mol⁻¹) in 100 g of water; (D) 1.22 g of benzoic acid (M = 122 g mol⁻¹) in 100 g of benzene. Kf for water is 1.86 K kg mol⁻¹ and for benzene 5.12 K kg mol⁻¹.
859 words, about 4 min2Silver Plating Batch That Fails the Adhesion Test
A small plating unit in Gaya takes an order for 200 steel spoons. The operator sets up a bath of 0.5 M AgNO3 with a pure silver plate as one electrode, hangs the spoons from the other electrode bar, and runs 1.5 A for 20 minutes per batch.
792 words, about 4 min3Defending a First-Order Claim from Titration Data
A student at a Muzaffarpur school follows the decomposition of hydrogen peroxide in alkaline medium by withdrawing exactly 10.0 mL of the reaction mixture at fixed intervals and titrating it against standard KMnO4 in acid medium. The burette readings were 25.0 mL at t = 0, 20.0 mL at 10 min and 16.0 mL at 20 min.
762 words, about 4 min4Three Unlabelled Cobalt(III) Ammine Bottles
A college stockroom has three unlabelled bottles known to contain cobalt(III) ammine complexes with the formulae [Co(NH3)6]Cl3, [Co(NH3)5Cl]Cl2 and [Co(NH3)4Cl2]Cl, but the labels have peeled off. The available equipment is limited to distilled water, a conductivity meter, 0.1 M AgNO3 solution and a Gouy balance; no spectrometer is working.
800 words, about 4 min5Four Unlabelled Liquids and a Badly Chosen First Test
Four unlabelled colourless liquids A, B, C and D are known to be ethanol, phenol, 2-methylpropan-2-ol and diethyl ether. The bench has sodium metal, anhydrous calcium chloride, neutral FeCl3 solution, bromine water, Lucas reagent (concentrated HCl with anhydrous ZnCl2) and a water bath.
903 words, about 5 min