Question

Q1. WHAT GAS IS INVOLVED WHEN HYDROCHLORIC ACID IS ADDED OVER A PIECE OF MARBLE IN ONE TEST TUBE AND ON A PIECE OF GRANULATED ZINC IN THE SECOND TEST TUBE?

Q2. what is the compound used for coating the photographic films in black and white?

Q3. what are the reactants of thermite process/reaction?

Q4. why do fire flies glow at night?

Q5. why do we store silver chloride in dark coloured bottles?

Q6. write the equation of the following and balance these equation:-

1. marble dissolves in hydrochloric acid to give calcium chloride , water and carbon dioxide.

Answer 1

co2 and H2 I hope u clear