P-block elements are those in which the last electron enters one of the three p-orbitals of their shells. The p-subshell has three p-orbitals, each holding two electrons, resulting in six groups of p-block elements. These include some metals, all non-metals, and metalloids. P-block elements are found in groups 13 to 16 of the periodic table, excluding helium. These elements are known for their excellent conductivity.
In this article, we will cover multiple-choice questions (MCQs) related to P-block elements, including their answers and explanations. This will help you revise key points and thoroughly understand the concept of p-block elements. Class 12 MCQ for P block elements will be included to assist students in preparing effectively.
Elements where the final electron enters a p-orbital of their shell are called P block elements. Each p-subshell has three p-orbitals, accommodating two electrons each, thus forming six groups of p-block elements.
P block elements often lose an electron easily, making them good conductors of electricity and heat. For instance, gallium, a P-block element, can melt in your hand. Silicon is a crucial metalloid in the p-block group, essential for making glass.
Refer to the CBSE Class 12 Chemistry P Block Elements MCQs provided below. These MCQs, along with answers, are available for free download. They are prepared as per the latest syllabus, CBSE books, and examination patterns suggested by CBSE, NCERT, and KVS. Practicing these p block elements class 12 MCQ can help Class 12 Chemistry students score higher marks.
The P Block Elements Class 12 Chemistry students should refer to the following multiple-choice questions with answers for Chapter 7: The P Block Elements. These MCQs are important for exams and can help you achieve good marks.
Class 12 Chemistry MCQ P-Block Elements with Answers
Ques 1. Boron shows diagonal relation with:
(a) Al
(b) C
(c) Si
(d) Sn
Answer: (c) Si
Ques 2. Catenation property is maximum in:
(a) phosphorus
(b) carbon
(c) sulphur
(d) zinc
Answer: (b) Carbon
Ques 3. Which one of the following is an electrophilic reagent?
(a) BF3
(b) KH3
(c) H2O
(d) None of these
Answer: (a) BF3
Ques 4. Which one of the following is the strongest Lewis acid?
(a) BF3
(b) BCl3
(c) BBr3
(d) Bl3
Answer: (b) BCl3
Ques 5. Which of the following is the strongest oxidizing agent?
(a) F2
(b) Cl2
(c) l2
(d) Br2
Answer: (a) F2
Also Check: P- Block Elements Class 12 Chemistry Notes
Ques 6. The number of P-O-P bonds in cyclic metaphosphoric acid is:
(a) 2
(b) 0
(c) 3
(d) 4
Answer: (c) 3
Ques 7. Which oxide of nitrogen is obtained on heating ammonium nitrate at 250°C?
(a) Nitric oxide
(b) Nitrous oxide
(c) Nitrogen dioxide
(d) Dinitrogen tetroxide
Answer: (b) Nitrous oxide
Ques 8. Atomicity of phosphorus is:
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (d) 4
Ques 9. The hybridisation of sulphur in sulphur hexafluoride is:
(a) sp3d
(b) sp3d2
(c) sp3d3
(d) sp3
Answer: (b) sp3d2
Ques 10. Which of the following is not correctly matched?
(a) PCl5 – sp3d hybridisation
(b) PCl5 – sp3 hybridisation
(c) PCl5 (solid) – [PtCl4]– [PtCl3]–
(d) H3PO3 – tribasic
Answer: (d) H3PO3 – tribasic
Ques 11. Which of the following is a tetrabasic acid?
(a) Hypo phosphorus acid
(b) Metaphosphoric acid
(c) Pyrophosphoric acid
(d) Orthophosphoric acid
Answer: (c) Pyrophosphoric acid
Ques 12. Which of the following has maximum ionisation potential?
(a) Al
(b) P
(c) Si
(d) Mg
Answer: (b) P
Ques 13. An element found from seawater is:
(a) magnesium
(b) Sodium
(c) Iodine
(d) None of these
Answer: (c) Iodine
Ques 14. The shape of XeF4 is:
(a) tetrahedral
(b) square planar
(c) pyramidal
(d) linear
Answer: (b) square planar
Ques 15. Which one of the following is least basic?
(a) NCl3
(b) NBr3
(c) NI3
(d) NF3
Answer: (c) NI3
Ques 16. Which of the following compounds can be used to obtain free nitrogen?
(a) NaNO2
(b) HNO2
(c) HNO3
(d) Ba3N2
Answer: (a) NaNO2
Ques 17. How many stable isotopes does the nitrogen atom have?
(a) 16
(b) 20
(c) 2
(d) 3
Answer: (c) 2
Ques 18. Nitrogen atom is represented at 147N. How many electrons does it need to attain the noble gas configuration?
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (c) 3
Ques 19. Why does nitrogen show anomalous properties with respect to other elements in group 15?
(a) Nitrogen has low ionization enthalpy
(b) Nitrogen atom has high inter-electronic repulsions
(c) Nitrogen molecule bears a triple bond
(d) Absence of vacant d-orbitals
Answer: (d) Absence of vacant d-orbitals
Also Check: Important Questions for Class 12 Chemistry Chapter 7 The p-Block Elements
Ques 20. Why is nitrogen preferably used in welding process and cooling of substances?
(a) It’s a gas and can easily be handled
(b) It has an extremely low freezing point
(c) It is an inert gas
(d) It is non-toxic
Answer: (c) It is an inert gas
Ques 21. Which oxide of nitrogen is released from car engines?
(a) Nitrogen dioxide
(b) Nitric oxide
(c) Nitrous oxide
(d) Nitrogen tetroxide
Answer: (b) Nitric oxide
Ques 22. What is the name of the natural process that is responsible for replenishing N2 back in the atmosphere from NO3–?
(a) Nitrification
(b) Nitrogen fixation
(c) De-nitrification
(d) Nitrate fixation
Answer: (c) De-nitrification
Ques 23. When liquid nitrogen is poured onto the hand, it slips away without affecting the hand actually. What is this phenomenon called?
(a) Kaye effect
(b) Kinetic isotope effect
(c) Kondo effect
(d) Leiden frost effect
Answer: (d) Leiden frost effect
Ques 24. Which group does the name ‘pnictogens’ refer to?
(a) Group 11
(b) Group 13
(c) Group 15
(d) Group 14
Answer: (c) Group 15
Ques 25. How many allotropes does nitrogen have?
(a) Zero
(b) One
(c) Two
(d) Three
Answer: (a) Zero
Ques 26. 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) D-orbitals are available for use in bonding applications.
Ques 27. The elements of group 15 are collectively referred to as –
(a) pnicogens
(b) pnicopens
(c) nicopen
(d) None of these
Answer: (a) pnicogens
Also Check: NCERT Exemplar Solutions for Class 12 Chemistry Chapter 7 – The p-Block Elements
Ques 28. 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) Bi3+ is preferable to Sb3+ and As3+.
Ques 29. Which of the following elements has the highest metallic content?
(a) P
(b) As
(c) Sb
(d) Bi
Answer: (d) Bi
Ques 30. 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) Bi
