A student takes a substance a which is attracted by a magnet and reacts with acids he takes another substance B which dissolve in carbon disulphide and reacts with hot concentrated nitric acid he takes a and b together in a test tube to form a baby reacts with acid how can we conclude whether a b has been formed or not
Answers
I encountered a strange phenomenon the other day. I was trying to dissolve some fine iron powder (about 1 gram) in nitric acid (should have used sulphuric acid, I know). I took about 15 mL of 65% nitric acid, added about 10 mL of water and added the fine powder. Nothing happened, even when the beaker was stirred by hand, no temperature rising, nothing. I let it stand for about 20 minutes, but when I came back, still no sign of dissolving. The iron powder just stayed in an even layer on the bottom of the beaker.
Then I thought of heating the mixture, so I took a magnetic stirring plate with heater and put the beaker on top of it. Within a second, a huge cloud of NO2 formed in the fume hood, the mixture boiled heavily and drops of acid splashed everywhere. What happened there?