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Elements in which the final electron enters one of the three p-orbitals of their respective shells are referred to as P block elements. Because a p-subshell has three degenerate p-orbitals, each of which can accommodate two electrons, there are a total of six groups of p-block elements in a p-subshell.
As a result of their tendency to lose an electron, P block elements are usually bright and serve as excellent conductors of electricity and heat. Gallium, for example, is a P-block element that possesses some remarkable properties of elements. In the palm of your hand, it’s a metal that can completely melt. Silicon is also one of the most important metalloids of the p-block group due to its role as a component of glass, which makes it one of the most important metalloids of the p-block group.
1)With regard to nitrogen, which of the following statements is incorrect?
(a) It has an extremely high electronegativity.
(b) D-orbitals are available for use in bonding applications.
(c) It is a typical non-metallic compound.
(d) It has a small molecular weight.
Answer b is correct.
Reason for the answer : Because of the nature of nitrogen, d-orbitals are not readily available.
2)The elements of group 15 are collectively referred to as –
(a) pnicogens
(b) pnicopens
(c) nicopen
(d) None of these
Answer :a
Reason for the answer :Pnicogens and their compound pnictides are the names given to this group of elements collectively.
3)The ionic radii (in ) of As3+, Sb3+, and Bi3+ are in the following order:
(a) As3+ is superior to Sb3+ and Bi3+.
(b) Sb3+ is superior to Bi3+ and As3+.
(c) Bi3+ is superior to As3+ and Sb3+.
(d) Bi3+ is preferable to Sb3+ and As3+.
Answer d is correct.
Explanation of the answer: The ionic radius increases as one moves down the group.
4)Which of the following elements has the highest metallic content?
(a) P
(b) As
(c) Sb
(d) Bi
Answer d is correct.
Reason for the answer: The amount of metallic character increases as you move down the group, with Bi being the most metallic.
Q.5)In the elemental state, which of the following elements from group 15 forms metallic bonds?
(a) As
(b) P
(c) Sb
(d) Bi
Answer d is correct.
Reason for the answer:When bismuth is in its elemental state, it forms metallic bonds.
6)What are the three most significant oxidation states of phosphorus?
(a) –3, +3, and +5 are the possible outcomes.
(b) –3, +3, and –5 are all possible outcomes.
(c) –3, +3, and +2 are the possible outcomes.
(d) –3, +3, and +4 are the possible outcomes.
Answer : a
7)Which of the following statements is incorrect about group 15 elements?
(a) The ionization enthalpies are in the following order: ∆iH1 < ∆iH2 < ∆iH3
(b) The boiling point and melting point of the substances in the group rise from the top to the bottom.
(c) Dinitrogen is a gas, whereas the rest of the elements are solids.
(d) All of the statements are true.
Answer (b)
The melting point of group 15 elements increases up to arsenic and then decreases until bismuth is reached.
8)Nitrogen is a relatively inactive element due to the fact that
(a) A stable electronic configuration exists in the nucleus of its atom.
(b) Its atomic radius is relatively small.
(c) Its electronegativity is quite high, which is a plus.
(d) Its molecule has a relatively high dissociation energy, which is significant.
Answer d is correct.
It is relatively inactive due to the presence of a triple bond between the N atoms, which has a very high dissociation energy (946 kJ mol–1), making it a relatively inactive compound.
9)With regard to pπ–pπ bonding, which of the following has the highest tendency?
(a) N
(b) P
(c) As
(d) Sb
Answer a
Nitrogen’s small size allows it to exhibit p-p lateral overlap, resulting in the formation of N≡N, whereas the rest of the elements’ larger sizes prevent them from exhibiting pπ-pπ lateral overlap.
10)Choose the incorrect statement from the list.
(a) Nitrogen has the ability to form p-p bonds with other elements in the periodic table.
(b) When bismuth is in its elemental state, it forms metallic bonds.
(c) Nitrogen exhibits a higher catenation tendency when compared to the other elements in the same group as nitrogen.
(d)It is worth noting that nitrogen has a higher first ionization enthalpy when compared to the other elements in the same group as it does.
Answer c
Reason for the answer:In comparison to other elements in the same group, the catenation tendency of phosphorus is higher.
11)Nitrogen is converted into N2, but phosphorus is converted into P4 from P, and the reason for this conversion is
(a) There is a triple bond formed between the phosphorus atoms.
(b) The p–p bonding is very strong.
(c) The strength of the pπ–pπ bonding is low.
(d) The formation of multiple bonds is simple.
Answer c is correct.
12) What is the reason for nitrogen’s chemical inertness?
(a) The formation of multiple bonds within the molecule
(b) The lack of polarity in the bond
(c) A short internuclear distance is maintained.
(d) A high level of bond energy
Answer d is correct.
13) Despite the fact that they are members of the same group, pentavalente in phosphorus is more stable than that in nitrogen. This is due to the fact that
(a) Electronic configurations that are dissimilar
(b) As a result of the presence of vacant d-orbitals.
C) the reactivity of the element phosphorus
(d)The inert nature of nitrogen
Answer b is correct.
Explanation:Because of the vacant d atomic orbitals in the valence shell of phosphorus, it is possible to achieve coordination number 5, whereas this is not possible in nitrogen.
14)The lowest boiling point is found in which of these two substances.
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3
Answer b is correct.
15)As we move from nitrogen to bismuth in the 15th group of elements, the pentavalency becomes less pronounced and the trivalency becomes more pronounced due to the presence of a valence bond.
(a) The presence of a nonmetallic character
(b) The effect of inert pairs
(c) A high degree of electronegativity
(d) A significant amount of ionization energy
Answer b
16)In which one of the following groups of elements are the elements referred to as chalcogens?
(a) Nitrogen, phosphorus, arsenic, and antimony are the most abundant elements.
(b) Oxygen, sulfur, selenium, and tellurium are all elements.
(c) Fluorine, chlorine, bromine, and iodine are all elements.
(d) Helium, neon, argon, krypton, and other noble gasses
Answer:(b)
17)When should nitric acid not be used? Which of the following applications is not appropriate?
(a)Ammonium nitrate, for example, can be found in fertilizers.
(b) In the case of explosives such as TNT (Trinitrotoluene).
(c) In refrigerators, it is used as a coolant or refrigerant.
(d) It can be used as an oxidizer in rocket fuel.
The answer is: c
