By observing the mentioned events below, which of the following shows chemical change? (i) Heating iodine changes the colour from bluish black to purple (ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance (iii) Mixing an acid and a base solution raises the temperature. (iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell

By observing the mentioned events below, which of the following shows

1.	By observing the mentioned events below, which of the following shows chemical change? (i) Heating iodine changes the colour from bluish black to purple (ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance (iii) Mixing an acid and a base solution raises the temperature. (iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell
Answer» By observing the mentioned events below, which of the following shows chemical change? (i) Heating iodine changes the colour from bluish black to purple (ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance (iii) Mixing an acid and a base solution raises the temperature. (iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell