Question

please answer this question​

Answer 1

1. When the solution is diluted with water, water molecules displace the nitrate ions in the coordinate sites around the copper ions, causing the solution to change to a blue color.

2. This incident , the flag will flutter in the direction of sea when it is midnight because at night time the sea becomes more hot than land and the air above sea traps heat and rises up due to which pressure difference is created and the cool air above land reaches the sea in order to maintain balance , so the flag will flutter in the direction of sea at midnight time and this phenomena is also called land breeze.