In electrochemical corrosion of metals, the metal undergoing corrosion:
A. acts as anode
B. acts as cathode
C. undergoes reduction
D. neutral
1 Answers
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In the combustion of 5.00 g of a metal, 9.44 g of metal oxide are formed. Hence, equivalent mass of the metal is
Correct Answer - B Matel `= 5. 00` g Metal oxide ` = 9. 44` g Oxygen combined `= 4. 44` g `4.44` g of oxyen combined with `= 5. 00`...
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A metal oxide has the formula `A_(2)O_(3)`. It can be reduced by hydrogen to give free metal and water. 0.1596 g of this metal oxide requires 6 mg of
Correct Answer - C `underset(0.1596 g)(A_(2) O_(3) )+ underset(0.006 g)(3 H_(2)) rarr 2 A + 3H_(2) O` `0.006 " g of" H_(2)` reduces ` 0. 1596 ` g of ` A_(2)...
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On reduction with hydrogen , 3.6 g of an oxide of metal left 3.2 g of metal . If the simplest atomic weight of metal is 64, the simplest formula of th
Correct Answer - 3 `E=(3.2)/(0.4)xx8=64,mol.wt.=2xx32=64` `n=(64)/(64)=1` `therefore "Formula of metal oxide" = M_(2)O`
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Upon fully dissolving 2.0 g of a metal in sulfuric acid, 6.8 g of the metal sulfate is formed. The equivalent weigth of the metal is-
Correct Answer - B Equivalents of metal=Equivalents of metal sulphate `("wt.of metal")/("Eq. wt. of metal")("wt. of metal sulphate")/("Eq. wt. metal sulphate")` `(2)/(x)=(6.8)/(x +48)` `6.8x=2x+96` `4.8x=96` `x=(96)/(4.8)=20`
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When a metal sphere is suspended at the end of a metal wire, its extension is 0.4 mm. If another metal sphere of the same material with its radius is
Correct Answer - A `l_(1) prop m_(1), l_(2) prop m_(2)` `(l_(2))/(l_(1))=(m_(2))/(m_(1))=(rho v_(2))/(rho v_(1)) =((4pi)/(3) r_(2)^(3))/((4pi)/(3)r_(1)^(3))` `(l_(2))/(l_(1)) =((r_(2))/(r_(1)))^(3) =(((r )/(2))/(r ))^(3)=(1)/(8)` `l_(2)=(l_(1))/(8) =(0.4)/(8) =0.05` mm.
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Consider the following statements : 1. An alloy is a mixture of two or more metals 2. An alloy is a mixture of a metal or metals with a non metal Whic
Correct Answer - D A/c to definition.
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In electrochemical corrosion of metals, the metal undergoing corrosion
Correct Answer - A Metal undergoing corrosion acts an anode .
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According to electrochemical theory the metal which rusting take place as a result of
Correct Answer - B According to electrochemical theory corrosion as a result of local action .
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What current is to be passed for `0.25` sec for deposition of certain weight of metal which is equal to its electrochemical equivalent ?
Correct Answer - A Electrochemical equivalent is the weight deposited by 1 coulomb `Q=1xxt "or" 1=1xx0.25` or 1=4A.
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Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are
Correct Answer - A (a) Al anode : `Fe to Fe^(2+)+2e^(-)xx2`. `("Al cathode" : O_(2)+2H_(2)O+4e^(-) to 4OH^(-))/("Overall reaction" , 2Fe+O_(2)+2H_(2)O to 2Fe(OH)_(2))` `:.` It is the correct option.
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