10. Which of the following statement
1 point
is incorrect?
Salty water slows down the process
of rusting.
Crystallization is a physical change.
Rusting makes the object weak.
Zinc and chromium remain
unaffected by water and moisture.
Answers
Answer:
Salt water slows down the process is incorrect
Answer:
Salt water is an electrolyte which conducts ions, speeding up rusting. No rust. Calcium chloride dries out the air. Salt solution acts as an electrolyte (any substance containing free ions that allows the substance to conduct electricity) allowing iron to lose electrons more easily and so speeds up the rusting process.
A physical process of obtaining large crystals of a pure substance from its solution is known as crystallization. Crystallization is a physical change.
Rusting has a number of effects on metal objects. It makes them look orange and rough. It makes them weaker, by replacing the strong iron or steel with flaky powder.
Zinc coatings are usually made passive after plating with a conversion coating to enhance the corrosion protection of a newly formed coating against the formation of ‘white rust’, which is a loose layer of zinc hydroxide and carbonate.Moisture content-affected electrokinetic remediation of Cr contaminated clay by a hydrocalumite barrier