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प्रश्न
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
पर्याय
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
State three differences between evaporation and boiling
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
