This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part Ii > Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 13 (17 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Chemical formula of orthoboric acid A) Na2B4O7. B) B2H6. C) Na2B4O7.10H2O. D) H3BO3. Show Answer Correct Answer: D) H3BO3. 2. H$_{2}$S is more acidic than H$_{2}$O because A) H-O bond dissociation energy is less also compared to H-S bond. B) H-S bond dissociation energy is less as compared to H-O bond. C) Oxygen is more electronegative than sulphur. D) Atomic number of oxygen is higher than sulphur. Show Answer Correct Answer: B) H-S bond dissociation energy is less as compared to H-O bond. 3. Which statement about noble gases is not correct? A) Xe forms XeF$_{6}$. B) Ar is used in electric bulbs. C) Kr is obtained during radioactive disintegration. D) He has the lowest b.pt among all the noble gases. Show Answer Correct Answer: C) Kr is obtained during radioactive disintegration. 4. Describe the trend in metallic character among p block elements. A) Metallic character decreases down a group and increases across a period. B) Metallic character increases down a group and decreases across a period among p block elements. C) Metallic character is highest in the middle of a period and lowest at the ends. D) Metallic character remains constant down a group and across a period. Show Answer Correct Answer: B) Metallic character increases down a group and decreases across a period among p block elements. 5. As we move down the group basicity of group 15 elements A) Increases. B) Decreases. C) Remain constant. D) None of the above. Show Answer Correct Answer: B) Decreases. 6. Which of the following factor is not responsible for the anamolous behaviour of the first member of each group in a p-block elements A) Small size. B) High ionisation enthalpy. C) Outer electronic configuration. D) Absence of d-orbitals. Show Answer Correct Answer: C) Outer electronic configuration. 7. Which of the following oxides of N is paramagnetic and neutral? A) NO$_{2}$. B) N$_{2}$O$_{4}$. C) NO. D) N$_{2}$O. Show Answer Correct Answer: C) NO. 8. Choose the correct statements from the following A) Rhombic sulphur is blue in colour. B) Rhombic sulphur is soluble in water but insoluble in organic solvents. C) Rhombic and monoclinic sulphur have S$_{6}$ molecules. D) In cyclo-S$_{6}$ molecule, the ring adopts chair form. Show Answer Correct Answer: D) In cyclo-S$_{6}$ molecule, the ring adopts chair form. 9. During decolourisation of acidified KMnO$_{4 }$solution, oxidation state of s changes from ..... to ..... A) +2 to +4. B) -2 to +4. C) +4 to +6. D) +6 to +4. Show Answer Correct Answer: C) +4 to +6. 10. Alkali metals are usually stored in ..... A) Jar. B) Plastic bag. C) Bottle. D) Kerosene. Show Answer Correct Answer: D) Kerosene. 11. Fill in the blanks by choosing the appropriate option. Conc.H$_{2}$SO$_{4}$ chars paper, wood and sugar by removing (i)From them. It is also known as (ii). It is manufactured by (iii) process. It is a strong (iv) and (v) acid. A) O$_{2-}$oil of vitriol-oleum-dehydrating-monobasic. B) SO$_{2-}$oil of winter-contact-oxidizing-monobasic green. C) H$_{2}$O-oil of vitriol-contact-oxidizing-dibasic. D) H$_{2}$O-oil of olay-solvay-dehydrating-dibasic. Show Answer Correct Answer: C) H$_{2}$O-oil of vitriol-contact-oxidizing-dibasic. 12. Transition metals form alloys with each other due to A) Large difference in their size. B) Presence of partially filled d-subshell. C) Low difference in atomic sizes. D) High charge/size ratio. Show Answer Correct Answer: C) Low difference in atomic sizes. 13. Which Group 15 element is essential for all living organisms? A) Oxygen. B) Phosphorus. C) Sulfur. D) Nitrogen. Show Answer Correct Answer: D) Nitrogen. 14. Which group of elements is known for having the lowest electronegativity in the periodic table? A) Group 14. B) Group 13. C) Group 1. D) Group 2. Show Answer Correct Answer: C) Group 1. 15. In contact process, maximum yield of SO$_{3 }$is obtained at A) High temperature and high pressure. B) Low temperature and high pressure. C) Low temperature and low pressure. D) High temperature and low pressure. Show Answer Correct Answer: B) Low temperature and high pressure. 16. Which alkali metal is least reactive? A) Rubidium. B) Lithium. C) Potassium. D) Sodium. Show Answer Correct Answer: B) Lithium. 17. What are representative elements in the periodic table? A) Representative elements are found in groups 3 to 12 of the periodic table. B) Representative elements include only the noble gases and halogens. C) Representative elements are exclusively metals located in the center of the table. D) Representative elements are the elements in groups 1, 2, and 13 to 18 of the periodic table. Show Answer Correct Answer: D) Representative elements are the elements in groups 1, 2, and 13 to 18 of the periodic table. ← PreviousRelated QuizzesScience QuizzesClass 12 QuizzesClass 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 1Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 2Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 3Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 4Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 5Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 6Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 7Class 12 Chemistry (Part Ii) Chapter 7 P Block Elements Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books