NEB Class 12 Chemistry exam-day guide
NEB Class 12 Chemistry · Prepare for the day ahead.
Your checklist
Admit card / exam registration slip
Carry the admit card issued for the practical examination; without it you may be refused entry. If you have lost it, contact your school or the exam authority immediately - confirm the replacement procedure with the provider (needs_review).
School/college ID or citizenship ID
Bring a photo ID as backup identification. The exact ID accepted for the practical exam is set by the National Examinations Board and your exam centre - confirm with the provider which document is mandatory (needs_review).
Laboratory coat or apron
A white lab coat or apron protects clothing from acids, stains, and spills. If your school does not supply one, bring your own; confirm whether the centre provides coats with the provider (needs_review).
Pen, pencil, eraser, and a small ruler
You will write observations, calculations, and answers on the answer sheet. Use blue or black ink for final answers and pencil for rough work and graphs. Bring a spare pen.
Simple scientific calculator
Useful for titration, molar mass, and concentration calculations. Programmable or graphing calculators are usually not allowed - confirm the permitted calculator type with the provider (needs_review).
Practical notebook / record file
Some centres ask to see your completed practical record or project file before or during the exam. Bring it if your school instructed you to; confirm the requirement with the provider (needs_review).
Watch (non-smart)
A simple wristwatch helps you manage time during the practical. Smart watches and phones are generally not permitted in the lab.
Rehearsed titration and qualitative analysis routine
Before exam day, practise reading the burette, using a pipette, rinsing apparatus, and identifying common cations and anions from your syllabus. Know the standard procedure for each experiment in your curriculum.
Memorised key data and formulae
Know molar masses, normality/molarity relations, indicator colour changes, and the tests for common ions (e.g., carbonate, sulphate, chloride, ammonium, copper, iron, zinc, calcium). These are frequently needed in the viva and written answers.
Safety awareness
Know where the wash basin, first-aid box, and eye-wash are in the lab. Never taste chemicals; waft odours gently; report spills and breakages to the invigilator at once.
Arrival plan and timing
Reach the exam centre well before the reporting time to allow for seating and instructions. The exact reporting time is printed on your admit card - confirm with the provider if it is unclear (needs_review).
No prohibited items
Leave phones, smart watches, and study notes outside the lab. Possession of unauthorised material can lead to disqualification; confirm the centre's exact rules with the provider (needs_review).
Plan the day
Review the full list of practical experiments in your Class 12 Chemistry syllabus: volumetric analysis (acid-base and redox titrations), qualitative salt analysis, and any physical chemistry or preparation experiments your school taught. For each, write out the aim, apparatus, procedure, observation table, and calculation from memory, then check against your notes. Practise calculations for molarity, normality, percentage purity, and water of crystallisation. Rehearse ion tests aloud so you can answer viva questions fluently.
Do at least one timed dry run of a titration calculation and one salt-analysis reasoning exercise (given observations, deduce the cation and anion). Rehearse reading a burette meniscus and recording readings to two decimal places. Prepare your lab coat, admit card, ID, pens, calculator, and notebook in one bag so nothing is left for the morning.
Stop learning new material. Revise only summaries: indicator colours, solubility rules, flame-test colours, and the standard formulae. Re-read safety rules and the instructions printed on your admit card. Confirm the exam centre location, reporting time, and travel plan. Sleep early; a tired candidate misreads burette readings and mislabels observations.
Eat a proper meal and arrive at the centre ahead of the reporting time. Carry only permitted items. Before entering, check that your admit card and ID are in your pocket and your lab coat is on. Listen carefully to the invigilator's instructions and note which experiment or seat is assigned to you.
Read the question paper fully before starting and budget time across the experiments and the written/viva parts. For titration: rinse and fill the burette, remove the air gap, take a rough reading, then record concordant readings; show the calculation clearly with units. For salt analysis: record each observation honestly and reason step by step to the ion. Write observations as you go rather than reconstructing them later. Keep your bench clean, label apparatus, and ask the invigilator for help only with apparatus or safety issues - not with chemistry answers. If time runs short, complete the calculation and conclusion, since these often carry marks.
Rules to check
Carry your admit card and the required photo ID at all times in the exam hall; candidates without valid documents may not be allowed to sit the practical - confirm the accepted documents with the provider (needs_review).
Follow all safety instructions: wear your lab coat, tie back long hair, never taste chemicals, waft odours gently, and report spills, breakages, or injuries to the invigilator immediately.
Do not bring phones, smart watches, or unauthorised notes into the laboratory. Keep only permitted items at your bench; confirm the centre's policy on calculators and personal items with the provider (needs_review).
Work independently. Do not exchange apparatus, chemicals, or answers with other candidates during the exam; suspected malpractice is handled under the board's examination regulations, which you should confirm with the provider (needs_review).
Record observations truthfully and show your working. Fabricated readings or copied results can lose marks and may be treated as misconduct.
If you need to leave the room, raise your hand and wait for the invigilator; do not leave the laboratory unaccompanied. Confirm the centre's policy on breaks and re-entry with the provider (needs_review).
Marks are awarded for correct procedure, accurate observation, sound calculation, and clear presentation, as well as for the viva; sloppy technique or missing units can cost marks even when the final answer is right.
Submit your answer sheet and any written work to the invigilator before leaving, and return apparatus or chemicals as instructed.