NEET Chemistry The D And Fblock Elements Class 12 Questions

Assertion (A) : Actinoids form relatively less stable complexes as compared to lanthanoids. Reason (R) : Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

Which of the following statements concerning lanthanide elements is false?

Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr²⁺ ion (Z = 24) is the same as that of a Nd³⁺ ion (Z = 60). In the light of the above statements, choose the correct answer from the options given below :

Match List - I with List - II List-I A. Haber process B. Wacker oxidation C. Wilkinson catalyst D. Ziegler catalyst List-II I. Fe catalyst II. PdCl₂ III. [(PPh₃)₃RhCl] IV. TiCl₄ with Al(CH₃)₃ Choose the correct answer from the options given below:

The pair of lanthanoid ions which are diamagnetic is

The stability of Cu²⁺ is more than Cu⁺ salts in aqueous solution due to -

Which of the following statements are INCORRECT? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in Sc₂O₃ to Mn₂O₇. C. Basic character increases from V₂O₃ to V₂O₄ to V₂O₅. D. V₂O₄ dissolves in acids to give VO₄³⁻ salts. E. CrO is basic but Cr₂O₃ is amphoteric. Choose the correct answer from the options given below:

Zr (Z=40) and Hf (Z=72) have similar atomic and ionic radii because of:

The incorrect statement among the following is:

From the following pairs of ions which one is not an iso-electronic pair?

The manganate and permanganate ions are tetrahedral, due to ______.

Which one of the following ions exhibits d-d transition and paramagnetism as well?

The type of isomerism shown by the complex [CoCl₂(en)₂] is __________.

The reason for greater range of oxidation states in actinoids is attributed to ________.

When copper is heated with conc. HNO₃, it produces ______.

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

The number of d-electrons in Fe²⁺ (Z = 26) is NOT equal to the number of electrons in which one of the following?

Reason of lanthanoid contraction is ________.

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because