Which one of the following gives Prussian blue colour?

Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with sodium carbonate to generate caustic soda. When $CO_2$ is bubbled through $A$,it turns cloudy,what is $A$?

Which domain includes well-known pathogenic organisms?

The shedding of leaves,flowers,or fruits due to a change in the hormonal balance in a plant is referred to as:

Vegetative propagation in mint occurs by

In the process of transcription,the sigma factor is important for: