Assertion : Cu(OH)2 is soluble in NH4OH but not in NaOH.Reason :

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 Multiple Choice QuestionsMultiple Choice Questions

291.

The highest magnetic moment is shown by the transition metal ion with the configuration :

  • 3d2

  • 3d5

  • 3d7

  • 3d9


292.

A transition metal ion exists in its highest oxidation state .It is expected to behave as :

  • a chelating agent

  • a central metal in a coordination compound

  • an oxidising agent

  • a reducing agent


293.

The flame colours of metal ions are due to

  • Frenkel defect

  • Schottky defect

  • metal deficiency defect

  • metal excess defect.


294.

Which radioactive element is being used in cancer therapy ?

  • Co2760

  • Ni2862

  • Ba56140

  • P1532


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295.

Which of the following is not an actinide ?

  • Curium

  • Californium

  • Uranium

  • Terbium


296.

Europium is :

  • s - block element

  • p - block element

  • d - block element

  • f - block element


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297.

Assertion : Cu(OH)2 is soluble in NH4OH but not in NaOH.

Reason : Cu(OH)2 forms a soluble complex with NH3.

  • 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.


A.

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

Because Cu(OH)2 forms a soluble complex with NH3, it is soluble in NH4OH but not in NaOH.


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298.

Number of unpaired electrons in Mn4+ is :

  • 3

  • 5

  • 6

  • 4


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299.

Cyanogen gas is obtained in the reaction

  • CuSO4 (aq) + KCN 

  • K4[Fe(CN)6heat

  • CH3CN + H2

  • CH3CONH2 + P2O5 


300.

Assertion : Copper sulphate solution is not stored in zinc vessel.

Reason : Zinc forms complex with CuSO4.

  • 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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