One flask immediately emits a gas once the stopper is removed what does the flask contain a. acetone b. diethyl ether c. butane d. chloroform

The answer is; C

This is due to the fact that the boiling point of butane is -5 degrees centigrade. These elements evaporate at room temperature (room temperature is usually around 20 degrees centigrade) which is past the boiling point of butane. A substance turns to gas when it passes it boiling point temperatures hence butane seems to sublimate when its flask is opened.  

carbon

explanation:

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.