Advertisements
Advertisements
Question
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
Options
True
False
Solution
True
APPEARS IN
RELATED QUESTIONS
Classify the following changes as physical or chemical:- photosynthesis in plants
True or false
Change of seasons is a non-periodic change.
True or false
Dissolving of a solid in liquid is a physical change.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Select the chemical changes from the following list of changes
The carbon cycle.
Mention a few physical properties of a substance.