During an experiment, the color changed from brown to blue. What does it show?
a) physical reaction occurred
b) biological reaction occurred
c) chemical reaction happened
d) none of these
During an experiment, the blue precipitate is formed. What does it show?
a) physical reaction occurred
b) biological reaction occurred
c) chemical reaction happened
d) none of these
During an experiment, effervescence occurred. This happens when gas is given off. What type of this reaction is?
a) physical reaction
b) biological reaction
c) chemical reaction
d) none of these
During an experiment, the beaker became cold. What does it show?
a) physical reaction occurred
b) biological reaction occurred
c) chemical reaction happened
d) none of these
Butter when placed in open air for some days, an unpleasant taste and bad odour is developed. Which type of reaction occurred?
a) physical reaction occurred
b) chemical reaction happened
c) biological reaction occurred
d) none of these
The formation of an insoluble solid when two solutions are mixed or a gas is bubbled into a solution is called………
a) condensation
b) precipitation
c) evaporation
d) liquefaction
Explanation:In an aqueous solution, precipitation is the process
of transforming a dissolved substance into an insoluble solid from a
super-saturated solution.
