661.

Which of the following is not an actinide ?

• Curium

• Californium

• Uranium

• Terbium

Europium is :

• s - block element

• p - block element

• d - block element

• f - block element

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.

Number of unpaired electrons in Mn⁴⁺ is :

• 3

• 5

• 6

• 4

Cyanogen gas is obtained in the reaction

• CuSO_4 (aq) + KCN $\to$

• K₄[Fe(CN)₆] $\stackrel{\mathrm{heat}}{\to }$

• CH₃CN + H₂O $\stackrel{∆}{\to }$

• CH₃CONH₂ + P₂O₅ $\stackrel{∆}{\to }$

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.

CuSO₄ does not react with :

• Fe

• Ag

• Zn

• Mg

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.

Reason of passively of iron is :

• Fe₂O₃

• Fe₃O₄

• FeO

• Fe₂O₄ ^. 3H₂O 

Fuel used in nuclear reactor is :

• plutonium

• thorium

• radium

• deuterium