Prof. Santosh Yadav and Prof. Anil Thomas Solutions for Chapter: d- and f-Block Elements, Exercise 3: Competitive Thinking

All the following statements about the transitional elements are true except that _____.

Which statement is NOT correct?

Knowing that the chemistry of lanthanoids $\left(\mathrm{Ln}\right)$ is dominated by its $+3$ oxidation state, which of the following statements is incorrect?

The CORRECT statement is _____.

Which of the following is a transition element as per the ground state electronic configuration?

Which of the following oxide has the maximum basicity?

Which one of the following statements related to lanthanoids is INCORRECT?

Sodium salt of an organic acid $\mathrm{X}$ produces effervescence with concentrated ${\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}$. $\mathrm{X}$ reacts with the acidified aqueous ${\text{CaCl}}_{\text{2}}$ solution to give a white precipitate, which decolourises the acidic solution of ${\text{KMnO}}_{\text{4}}$. $\mathrm{X}$ is ______.