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

• 3d²

• 3d⁵

• 3d⁷

• 3d⁹

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

The flame colours of metal ions are due to

• Frenkel defect

• Schottky defect

• metal deficiency defect

• metal excess defect.

Which radioactive element is being used in cancer therapy ?

• ${}_{27}{}^{60}\mathrm{Co}$

• ${}_{28}{}^{62}\mathrm{Ni}$

• ${}_{56}{}^{140}\mathrm{Ba}$

• ${}_{15}{}^{32}\mathrm{P}$

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

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.

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.