Actinoids

27 questions on Actinoids from the d- and f-Block Elements chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• In the usual classification (the fourteen elements that follow actinium), the last member of the actinoid series is NEET level
• Which of the following is true of every actinoid element? NEET level
• Among the following actinoids, the one that is known to exhibit the highest oxidation state of +7 is NEET level
• Actinoids show a wider range of oxidation states than lanthanoids mainly because NEET level
• Which of the following is an actinoid? NEET level
• The decrease in size across the actinoid series is, element to element, greater than that across the lanthanoids. The reason generally given is that JEE Main level
• Assertion (A): Early actinoids show a greater range of oxidation states than the corresponding lanthanoids. Reason (R): The 5f, 6d and 7s orbitals of early acti... JEE Main level
• Among the following actinoids, the one whose most stable oxidation state is +4 rather than +3 is JEE Main level
• In the uranyl ion UO2^2+, the oxidation state of uranium and the number of 5f electrons remaining on it are respectively JEE Main level
• A volatile compound used in the gaseous diffusion or centrifuge enrichment of uranium isotopes is JEE Main level
• Match the elements in Column I with their ground-state outer configurations in Column II. Column I: P = Th (Z = 90), Q = Pa (Z = 91), R = Am (Z = 95), S = Cm (Z... JEE Main level
• Which of the following ions has the same number of unpaired electrons as Gd^3+ (4f^7)? (Atomic numbers: Np 93, Pu 94, Am 95, Cm 96.) JEE Main level
• Which of the following ions is diamagnetic? (Th: 6d^27s^2, U: 5f^36d^17s^2, Np: 5f^46d^17s^2, Pu: 5f^67s^2) JEE Main level
• Plutonium (Z = 94) has the ground-state configuration [Rn]5f^67s^2. The number of unpaired electrons in Pu^4+ is JEE Main level
• Which of the following statements about uranium (Z = 92, [Rn]5f^36d^17s^2) are correct? JEE Main level
• Which of the following statements are correct? JEE Main level
• Atomic numbers: U 92, Np 93, Pu 94, Am 95, with ground-state configurations 5f^36d^17s^2, 5f^46d^17s^2, 5f^67s^2 and 5f^77s^2 respectively. Among the tripositiv... JEE Advanced level
• Neptunium (Z = 93, [Rn]5f^46d^17s^2) reaches the highest oxidation state shown by actinoids. The oxidation state and the number of 5f electrons left on the meta... JEE Advanced level
• Assertion (A): Early actinoids (Pa to Pu) show many oxidation states, but from Cm onwards the +3 state predominates. Reason (R): With increasing nuclear charge ... JEE Advanced level
• UO3 is heated in hydrogen to give a solid Y in which U is in the +4 state. Y reacts with HF to give Z, and Z reacts with F2 to give a volatile compound W. (UO3 ... JEE Advanced level
• Match the ions in Column I with their spin-only magnetic moments (BM) in Column II. Column I: P = U^3+ (5f^3), Q = Np^3+ (5f^4), R = Pu^3+ (5f^5), S = Cm^3+ (5f... JEE Advanced level
• Atomic numbers: Eu 63, Tb 65, Gd 64, Cm 96, Am 95, Bk 97. Ground states: Eu 4f^76s^2, Tb 4f^96s^2, Cm 5f^76d^17s^2, Am 5f^77s^2, Bk 5f^97s^2. In which pair do b... JEE Advanced level
• Thorium compounds such as ThO2 are white and diamagnetic. The best explanation uses the configuration of Th ([Rn]6d^27s^2) and the fact that JEE Advanced level
• Which of the following statements are correct? JEE Advanced level
• Atomic numbers and configurations: Pu 94 (5f^67s^2), Am 95 (5f^77s^2), Cm 96 (5f^76d^17s^2), Bk 97 (5f^97s^2). Which ions have the 5f^7 configuration? JEE Advanced level
• Atomic numbers: Th 90 (6d^27s^2), Pa 91 (5f^26d^17s^2), U 92 (5f^36d^17s^2), Np 93 (5f^46d^17s^2), Pu 94 (5f^67s^2). Which species have no 5f electron? JEE Advanced level
• Which statements correctly compare lanthanoids and actinoids? JEE Advanced level