Usually 2 marks a paper · mostly very short answers · asked in 2 of the last papers
The board questions below are real and complete — they come from the CBSE papers themselves. The written notes for this topic are still being prepared.
2 from the CBSE papers we hold — the exact wording the board used.
A student performs the following experiment in his school laboratory (a conical flask fitted with a delivery tube containing dilute sulphuric acid and Zn granules - see figure). List two observations to justify that in this experiment a chemical change has taken place.
Write balanced chemical equation for the reaction that occurs when: (i) blue coloured copper sulphate crystals are heated and (ii) Sodium hydrogen carbonate is heated during cooking.