RE-NEET Chemistry The d– and f–Block Elements Class 12 Questions
6 questions
The green paramagnetic species formed by heating KMnO₄ at 513 K is
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Generally, 3d transition metals have high melting points. Reason R: Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding.
In light of the above statements, choose the most appropriate answer from the options given below:
The lanthanide ion having four unpaired electrons is (Given: Atomic numbers of Ce=58, Nd=60, Tb=65 and Ho=67)
Which of the following pairs of ions will have same spin only magnetic moment values within the pair?
Which of the following set of ions act as oxidising agents?
The UV⁻visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are: