RBSE SS Chemistry case studies
RBSE SS Chemistry · Put your knowledge to work in context.
RBSE Senior Secondary Chemistry is the Class 12 chemistry paper of the Board of Secondary Education, Rajasthan (RBSE), Ajmer. Science-stream students take it to complete the Class 12 certificate and usually as a qualifying subject for undergraduate science, engineering, pharmacy and medical admissions. The RBSE SS Chemistry case studies are 5 cases and about 3,975 words.
1Antifreeze Batch for a Desert Workshop Fleet
A garage in Jodhpur services radiator cooling systems. The workshop buys ethylene glycol (molar mass 62 g mol⁻¹) in bulk and adds it to 4.0 kg of water in each aluminium radiator; K f for water is 1.86 K kg mol⁻¹.
817 words, about 4 min2Choosing a Sacrificial Anode for a Buried Steel Main
A water board is laying a 3.2 km buried mild-steel main through irrigated farmland. The soil is moist, aerated and chloride-rich (resistivity about 20 Ω m), and the pipe carries a coal-tar coating that is damaged at several joints.
785 words, about 4 min3Setting a Shelf Life for a Thermally Fragile Syrup
A small pharma unit makes an orally dispensed sugar syrup in which the active ingredient hydrolyses by a first-order reaction with k = 5.0 × 10⁻⁸ s⁻¹ at 25 °C. The label must claim 90% of the stated potency at the end of shelf life (t₉₀ = 0.105/k).
801 words, about 4 min4Fixer Bath Selection: Ammonia or Thiosulfate?
A film-processing studio mixes its own fixing bath from sodium thiosulfate. A fresh 1.00 L bath is 1.00 M in thiosulfate and must dissolve at least 0.050 mol of AgCl carried over from each roll of film before it is spent.
791 words, about 4 min5Assay and Clean-Up of a Propanoic Acid Consignment
A small chemical supplier receives a 1.50 g consignment labelled 'propanoic acid, 99% pure'. The quality officer dissolves it in water and titrates with 0.100 M NaOH to a phenolphthalein endpoint, consuming 185.0 mL.
781 words, about 4 min