CBSE Class 11 Chemistry The P Block Elements Worksheet

The P Block Elements MCQ Questions with Answers Class 11 Chemistry

Question- Aluminium vessels should not be washed with materials containing washing soda because

(a) washing soda is expensive

(b) washing soda is easily decomposed

(c) washing soda reacts with aluminium to form soluble aluminate

(d) washing soda reacts with aluminium to form insoluble aluminium oxide

Answer-(c)

Question-Which of the following is most abundant in the earth crust ?

(a) Boron

(b) Aluminium

(c) Gallium

(d) Thallium

Answer-(b)

Question-Which of the following properties of aluminium makes it useful for food packaging ?

(a) Good electrical conductivity

(b) Good thermal conductivity

(c) Low density

(d) Non toxicity

Answer-(c)

Question-The element which shows least metallic character is

(a) Indium

(b) Boron

(c) Aluminium

(d) Gallium

Answer-(b)

Question-Aluminium chloride is a/an

(a) Bronsted - Lowery acid

(b) Arhenius acid

(c) Lewis acid

(d) Lewis base

Answer-(c)

Question-Which one of the following has the lowest m.p.?

(a) B

(b) Al

(c) Ga

(d) Tl

Answer-(c)

Question- The exhibition of highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF₆^3- ?

(a) B

(b) Al

(c) Ga

(d) In

Answer-(a)

Question-The strongest Lewis acid is

(a) BF₃

(b) BCl₃

(c) BBr₃

(d) BI₃

Answer-(d)

Question-Which of the following does not form M3+ ion?

(a) Boron

(b) Aluminium

(c) Indium

(d) Gallium

Answer-(a)

Question-The group 13 element that is liquid during summer and used for measuring high temperature is

(a) Boron

(b) Aluminium

(c) Gallium

(d) Indium

Answer-(c)

Question- Which out of the following compounds does not exist?

(a) BF₃

(b) TlCl₃

(c) TlCl₅

(d) Both (b) and (c)

Answer-(c)

Question-Thallium shows different oxidation states because

(a) it is transition element

(b) of inert pair effect

(c) of its amphoteric character

(d) of its higher reactivity

Answer-(b)

Question-Which metal is protected by a layer of its own oxide?

(a) Al

(b) Ag

(c) Au

(d) Fe

Answer-(a)

Question-Ionisation enthalpy (Δ_iH₁kJ mol^–1) for the elements of Group 13 follows the order.

(a) B > Al > Ga > In > Tl

(b) B < Al < Ga < In < Tl

(c) B < Al > Ga < In > Tl

(d) B > Al < Ga > In < Tl

Answer-(d)

Q1. Why is Boron Metalloid?

Q2. Why non-metals generally from An-Ions?

Q3. Why does Boron not form B³⁺ ion?

Q4. Which type of Bonds are formed by Boron and why?

Q5. Why h bonding (ph – ph) is not strong for heavier p-block elements?

Q6. Describe what happens when Boric acid is heated?

Q7. Write the structure of dibcrave and explain the nature of bonding in it? Give its lab preparation?

Q8. Why do Boren halides form addition compounds with ammonia and amines?

Q9. What is the basic structural unit of artho boric acid? Name type of bond present in them.

Q10. Why is Boric acid monobasic?

Q11. What are hydridoborates? How are they prepared?

Q12. Name two hydridoborates which are good reducing agents.

Q13. What is Inorganic Benzene and how it is prepared? Why it is called Inorganic Benzene?

Q14. What happens when Boranes are hydrolysed?

Q15. What happens when Borax is heated?

Q16. Give important characteristics of Boron which are not shown by other members of the gp.

Q17. White fumes appear around the bottle of anhydrous AlCl₃. Give reason.

Q18. Boron is unable to form BF₆^3- ion? Explain.

Q19. What is the hybridization state of Al in [Al (H₂O₆)³⁺ ion?

Q20. What are fullerenes? How are they prepared?

Q21. Give points of similarities between Boron and silicon & why there is resemblance.