Assertion : Fe3+ can be used for coagulation of As2S3 sol.Re

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 Multiple Choice QuestionsMultiple Choice Questions

251.

The reaction between metallic silver and aqueous NaCN forming a soluble complex occurs in the presence of :

  • nitrogen

  • oxygen

  • helium

  • chlorine


252.

Which one is colourless ?

  • Co2+

  • Ni2+

  • Fe3+

  • Cu+


253.

In first transition series, which element show maximum oxidation states :

  • Co

  • Mn

  • Cr

  • Fe


254.

The most paramagenetic is :

  • Cr3+

  • Co2+

  • Mn2+

  • Fe2+


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255.

The diamagnetic species is

  • [Ni(CN)4]2-

  • [Ni(Cl)4]2-

  • [CoCl]2-

  • [CoF6]3-


256.

Enrichment of U235 is done by

  • IF7

  • CIF3

  • IF3

  • ClF5


257.

Colour imparted by Co(II) compounds to glass is

  • green

  • brown

  • violet

  • blue


258.

In presence of acidic medium, KMnO4 converts H2S into

  • Mn only

  • MnS only

  • MnS + S

  • S only


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259.

Lanthanides and actinides are also called :

  • short periods

  • inner-transition elements

  • long periods

  • main transition elements


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260.

Assertion : Fe3+ can be used for coagulation of As2S3 sol.

Reason : Fe3+ reacts with As2S3 to give Fe2S3.

  • 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.


C.

If assertion is true but reason is false.

Fe3+ is positively charged whereas As2S3 is negatively charged sol. Their charges are neutralised on mixing hence, mutual precipitation (coagulation) occurs.


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