Periodic Table, Bonding & d/f-Block — NEET Chemistry practice

Question 1

Mendeleev corrected the atomic weights of elements such as Be and In using the formula:

Accepted Answer

Atomic weight = Equivalent weight × Valency

Answer

√ν = a(Z − b)

Answer

mvr = nh/2π

Answer

Equivalent weight = Atomic weight × Valency

Question 2

Which statement about the periodic classification of elements is NOT correct?

Accepted Answer

For transition elements, the 3d orbitals are filled after 3p and before 4s.

Answer

Properties of elements are a periodic function of their atomic numbers.

Answer

Non-metallic elements are fewer in number than metallic elements.

Answer

First ionisation enthalpies generally increase across a period with increasing atomic number.

Question 3

Read the Assertion and Reason carefully and choose the correct option. Assertion: 5f electrons can participate in bonding to a far greater extent than 4f electrons. Reason: 5f orbitals are not as deeply buried as 4f orbitals.

Accepted Answer

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Answer

Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

Answer

Assertion is true, but Reason is false.

Answer

Assertion is false, but Reason is true.

Question 4

Read Statement A and Statement B carefully and choose the correct option. Statement A: The period number in the periodic table corresponds to the highest principal quantum number of the element's orbitals. Statement B: The first period of the periodic table contains 8 elements.

Accepted Answer

Statement A is true, but Statement B is false.

Answer

Both Statement A and Statement B are true.

Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are false.

Question 5

Match the types of elements (Column I) with their characteristic electronic configuration (Column II). Column I: Alkali metals; Alkaline earth metals; Halogens; Noble gases Column II: ns² np⁵; ns² np⁶; [He] 2s¹; [Ne] 3s²

Accepted Answer

A→R, B→S, C→P, D→Q

Answer

A→P, B→Q, C→R, D→S

Answer

A→Q, B→P, C→R, D→S

Answer

A→S, B→R, C→Q, D→P

Question 6

Read the Assertion and Reason carefully and choose the correct option. Assertion: The bond in Cl₂ is a single covalent bond. Reason: In Cl₂, each chlorine atom shares one electron with the other, giving a bond order of one.

Accepted Answer

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Answer

Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

Answer

Assertion is true, but Reason is false.

Answer

Assertion is false, but Reason is true.

Question 7

Which statements about BF₄⁻ and AlF₆³⁻ are correct? (1) B and Al differ in their oxidation states. (2) B and Al differ in their covalency. (3) B obeys the octet rule. (4) B and Al show a diagonal relationship.

Accepted Answer

(ii), (iii)

Answer

(i), (ii)

Answer

(ii), (iii), (iv)

Answer

(i), (ii), (iii)

Question 8

Read Statement A and Statement B carefully and choose the correct option. Statement A: The crystal-field splitting Δt of tetrahedral complexes is smaller than Δo of octahedral complexes. Statement B: Fewer ligands, which do not point directly at the d-orbitals, interact less in tetrahedral complexes, giving a smaller splitting energy.

Accepted Answer

Both Statement A and Statement B are true.

Answer

Statement A is true, but Statement B is false.

Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are false.

Periodic Table, Bonding & d/f-Block: NEET practice questions

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