# Which of the following will raise the rate of corrosion of metals ? a) presence of impuritiesb)presence of electrolyte c) presence of $CO_2$d) presence of argon  Option 1) a,b Option 2) a,b,c Option 3) b,c Option 4) b,d

As we have learned

Factor affecting corrosion -

1. Reactivity of metals

2. Presence of moisture and atmospheric gases like CO2 SO2 etc.

3. Presence of impurity

4. Presence of electrolyte

5. Strains in the metal

-

a) Presence of impurities  increases the speed of rate of oxidation

b) electrolyte raise the rate of corrosion by increasing the rate of oxidation

c) $CO_2$  act as electrolyte

d)Ar is inert and doesn't react with metals

Option 1)

a,b

Option 2)

a,b,c

Option 3)

b,c

Option 4)

b,d

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