Reason of passively of iron is : from Chemistry The d-And-f-Bloc

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 Multiple Choice QuestionsMultiple Choice Questions

301.

CuSO4 does not react with :

  • Fe

  • Ag

  • Zn

  • Mg


302.

Assertion : Magnetic moment of Dy is the highest among the lanthanoids.

Reason : Orbital motion contributes magnetic moment.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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303.

Reason of passively of iron is :

  • Fe2O3

  • Fe3O4

  • FeO

  • Fe2O4 . 3H2


C.

FeO

When iron makes an oxide FeO , it makes the iron passive .


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304.

Fuel used in nuclear reactor is :

  • plutonium

  • thorium

  • radium

  • deuterium


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305.

Essential component of amalgam is :

  • Fe

  • Pb

  • Hg

  • Cr


306.

The compound used in enrichment ofuranium for nuclear power plant is

  • U3O8

  • UF6

  • UO2(NO3)2

  • UCl4


307.

What is the name of element with atomic number 105 ?

  • Kurchatovium

  • Dubnium

  • Nobelium

  • Holmium


308.

What is the general outer electronic configuration of the coinage metals ?

  • ns2 np6

  • (n-1)d10 ns1

  • (n-1)d10 ns2

  • (n-1)d9 ns2


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309.

Assertion : E° for Mn3+/Mn2+ is more positive than Cr3+/Cr3+

Reason : The third ionization energy of Mn is larger than that of Cr.

  • If both assertion and reason are true and reason is the correct explanation of the assertion.

  • If both assertion and reason are true but reason is not the correct explanation of the assertion.

  • If assertion is true, but reason is false.

  • Both assertion and reason are false statements.


310.

Assertion : K2Cr2O7 is used as primary standard in volumetric analysis.

Reason : It has a good solubility in water.

  • If both assertion and reason are true and reason is the correct explanation of the assertion.

  • If both assertion and reason are true but reason is not the correct explanation of the assertion.

  • If assertion is true, but reason is false.

  • Both assertion and reason are false statements.


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