Bleaching powder is prepared by passing :
Cadmium pollution is associated with :
The working of a rockets based on the principle of :
Yellow spots on citrus leaves is due to the deficiency of :
Which one of the following is the smallest endocrine gland in human body?
According to the World Health Organization's cancer agency’s report declared on 12 June 2012, …….. is the most probable cause of cancer among the people.