Test: f-Block Elements (Actinides) - II - NEET MCQ

Identify the incorrect statement among the following.

In which 5f subshell is half-filled?

Actinides

Which of the following is not an actinide?

The compound used in enrichment of uranium for nuclear power plant is

Which one of the following shows oxidation state upto + 7?

The general electronic configuration of actinides is (n - 2) f^1-14 (n - 1) d0^-1 ns2.

Which one of the following actinides has one electron in 6d-orbital?

Direction (Q. Nos. 11-15) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q.

Commonly used nuclear fuels are

Which are the correct statements?

Pick up the incorrect statements.

Which species have half-filled 5f subshell?

Which are correct regarding actinides?

Comprehension Type

Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Rutherford and Soddy found that every uranium ore that they examined contained minute quantities of radium and an appreciable amount of non-radioactive lead. From this, they concluded that uranium is the starting substance in a series of radioactive transformations which pass through radium and ultimately ends with stable lead. These transformations are accompanied by spontaneous emissions of alpha and beta particles resulting in the formation of new atoms. All the nuclei from the initial element to the final stable element constitute a series called disintegration series. Mass number changes by 4 units per each alpha particle emission.
There are four disintegration series. They are

Q. 

The number of alpha and beta particles emitted in the nuclear reaction  are

Rutherford and Soddy found that every uranium ore that they examined contained minute quantities of radium and an appreciable amount of non-radioactive lead. From this, they concluded that uranium is the starting substance in a series of radioactive transformations which pass through radium and ultimately ends with stable lead. These transformations are accompanied by spontaneous emissions of alpha and beta particles resulting in the formation of new atoms. All the nuclei from the initial element to the final stable element constitute a series called disintegration series. Mass number changes by 4 units per each alpha particle emission.
There are four disintegration series. They are

Q. 

Lead isotope is the end product in all disintegration series except 

Matching List Type

Direction (Q. No. 18) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

One Integer Value Correct Type

Direction (Q. Nos. 19-23) This section contains 5 questions. When worked out wiil result in an integer from 0 to 9 (both inclusive).

Q. 

The number of electrons present in 5f subshell of berkelium are

The number of electrons present in 5f subshell of Th⁴⁺ ion are

Number of elements that show + 6 oxidation state among Th, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm are

The number of unpaired electrons in the element with atomic number 100 are

Pb, in this transformation, number of alpha particles (α) liberated

Statement Type

Direction (Q. Nos. 24 and 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : Actinides show a large number of oxidation state whereas lanthanides show a limited number of oxidation state.

Statement Il : Energy gap between 4f, 5d and 6s subshells is small whereas that between 5f, 6d and 7s subshell is large.

Statement I : Actinides form relatively less stable complexes as compared to lanthanides.

Statement II : Actinides can utilise their 5f -orbitals along with 6d-orbitals in bonding but lanthanides do not use their 4f-orbitals for bonding.