Answer the question on the basis of passage given below: P block elements are placed in groups 13 to 18 of the periodic table. Their valence shell electronic configuration is ns2 np1-6. Group 16 of the p block elements are known as the group of chalcogens having ns2 np4 as their general electronic configuration. They exhibit a number of oxidation states, but the stability of the -2 oxidation state decreases down the group. They are sometimes also known as the group of chalcogens as the name is derived from the Greek word for brass and points to the association of sulfur and its congeners with copper. Their ionisation enthalpy decreases down the group. Oxygen shows anomalous behaviour due to its small size and high electronegativity.
Given below are the Hydrides formed by group 15 elements. Choose the correct decreasing order of basicity of the following hydrides: (A) AsH₃ (B) PH₃ (C) NH₃ (D) BiH₃ (E) SbH₃ Choose the correct answer from the options given below:
(D), (E), (A), (C), (B)
The basicity of the hydrides of Group 15 elements decreases as we move down the group due to the increasing size of the central atom, which leads to less availability of the lone pair for donation. The order of basicity is as follows:
- **NH₃ (C)** has the highest basicity because nitrogen is the smallest and can easily donate its lone pair.
- **PH₃ (B)** has a lower basicity than NH₃ due to the larger size of phosphorus.
- **AsH₃ (A)** follows, as arsenic is larger than phosphorus.
- **SbH₃ (E)** has even lower basicity due to the larger size of antimony.
- **BiH₃ (D)** has the least basicity because bismuth is the largest atom among the group 15 elements, resulting in very poor lone pair donation.
Thus, the correct order of basicity is **(C), (B), (A), (E), (D)**, which corresponds to **option (a)**.
Important Questions from p-block Elements
Second most abundant element in alloy misch metal is:
Match List-I with List-II:
List-I List-II (A) Gel (I) Hair cream (B) Foam (II) Dust (C) Emulsion (III) Cheese (D) Aerosol (IV) Whipped cream Choose the correct answer from the options given below:
Rate of a reaction changes from 2.48 × 10⁻³ mol⁻¹ sec⁻¹ to 4.96 × 10⁻³ mol⁻¹ sec⁻¹ when concentration of reactant is changed from 0.6 M to 2.4 M respectively, the order of reaction is:
Degree of dissociation, when molar conductivity of X at its concentration C is 24.14 and its limiting molar conductivity is 48.28 will be:
A divalent ion of 'V' (Atomic no. 23) in aqueous solution is:
