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chemistry1

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1.
1 point
46) In galvanizing process the iron sheet to galvanized is first cleaned by pickling with the dilute solution of
2.
1 point
48) The temperature molten zinc in galvanizing process is
3.
1 point
Which of the following metal forms unstable oxide film
4.
1 point
34) In pitting corrosion, the part of metal underneath the impurity becomes
5.
1 point
Tin coated utensil are used foodstuff because
6.
1 point
54) In tinning process the flux used is
7.
1 point
47) In galvanizing process the temperature of sulphuric acid bath used to remove impurities should be
8.
1 point
38) During galvanic corrosion the more active metal acts as
9.
1 point
53) In tinning process the less reactive metal used is
10.
1 point
The chemical composition of rust is
11.
1 point
37) Name the material which decreases waterline corrosion
12.
1 point
51) Galvanized ware cannot be used for storing foodstuff because
13.
1 point
The rapid & continuous corrosion causes due to formation of which oxide film
14.
1 point
Sacrificial anodic protection method is also called as
15.
1 point
The metal Al,Sn,Cu & Pb forms which oxide film
16.
1 point
Electrochemical corrosion is also called as
17.
1 point
Foodstuff container should not be
18.
1 point
The oxide film formed by metal like gold, silver, & platinum is
19.
1 point
Which corrosion is prevented by cathodic protection method
20.
1 point
Molybdenum oxide forms which oxide film
21.
1 point
35) In which solution stainless steel and aluminum shows characteristic pitting
22.
1 point
45) The method to prevent corrosion of iron by zinc coating is called is.
23.
1 point
Anodizing coating are generally produced on which metal and alloy
24.
1 point
With increase in tempera of environment the rate of corrosion
25.
1 point
The metal commonly used as sacrificial anode are
26.
1 point
27) The rate of corrosion of iron I atmosphere depend upon
27.
1 point
In electrochemical corrosion
28.
1 point
Wet corrosion is also called as
29.
1 point
Which oxide film is protective
30.
1 point
Silver & chlorine forms Agcl film which is
31.
1 point
39) During galvanic corrosion the most noble metal acts as
32.
1 point
Which of the following metal forms stable non porous oxide film
33.
1 point
Vegetable oil are used in tinning process to protect the tin coated surface from
34.
1 point
One of the common sacrificial anodic metal is
35.
1 point
30) During oxygen concentration type corrosion, the corrosion
36.
1 point
52) The method to prevent corrosion of iron by tin coating is called
37.
1 point
40) The metal at the top of electrochemical series is
38.
1 point
During wet corrosion
39.
1 point
50) In galvanizing process the temperature of annealing chamber
40.
1 point
Atmospheric corrosion is also called as
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