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CBSE

Chemistry

NEET Chemistry : The d-And-f-Block Elements

91.

The flame colours of metal ions are due to

92.

Cyanogen gas is obtained in the reaction

93.

Assertion : The degree of complex formation in actinides decreases in the order $M^{4 +} > {MO}_{2}^{2 +} > M^{3 +} > {MO}_{2}^{+}$ .

Reason : Actinides form complexes with p-bonding ligands such as alkyl phosphines and thioethers.

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.

94.

Europium is :

95.

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

96.

Which radioactive element is being used in cancer therapy ?

97.

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.

98.

Number of unpaired electrons in Mn⁴⁺ is :

99.

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

100.

Which of the following is not an actinide ?

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