Class 11 The P-Block Elements MCQs with Answers

Class 11 Chemistry MCQs 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. 

Class 11 Chemistry P-Block Elements MCQs with Answer

Q1. Which of the following strongest lewis acid:

1. BCl₃
2. BF₃
3. BI₃
4. BBr₃

Q2. Graphite cleaves easily between the layers. Thus, it is:

1. Soft.
2. Slippery.
3. Both (a) and (b).
4. None of these.

Q3. The property which does not support anomalous behavior of boron is:

1. Formation of trihalides.
2. High ionisation energy.
3. Small size.
4. High electronegativity.

Q4. Which of the following statements are correct?

1. Fullerenes have dangling bonds.
2. Fullerenes are cage-like molecules.
3. Graphite is thermodynamically most stable allotrope of carbon.
4. Graphite is slippery and hard and therefore used as a dry lubricant in machines.

Q5. The mixture of CO and H, is known as:

1. Producer gas.
2. Synthesis gas.
3. Water gas.
4. Both (b) and (c).

Q6. Thermodynamically the most stable form of carbon is:

1. Diamond.
2. Graphite.
3. Fullerenes.
4. Coal.

Q7. Which of the following is used to make transistor and semiconductor devices?

1. Ultrapure form of germanium.
2. Ultrapure form of silicon.
3. Both (a) and (b).
4. Neither (a) nor (b).

Q8.

Q9. Quartz is extensively used as a piezoelectric material, it contains _.

1. Pb.
2. Si.
3. Ti.
4. Sn.

Q10. Boric acid is acid because its molecule:

1. Contamp replaceable H^– .
2. Gives up proton.
3. Accepts OH from water and releases proton.
4. Combines with proton from water molecule.

Q11. Carbon has no tendency to form complex compounds due to:

1. Its small size.
2. The availability of vacant d-orbitals.
3. Non-availability of vacant d-orbitals.
4. No tendency to form covalent bonds.

Q12. Boric acid is not a protonic acid but it acts as a Lewis acid by:

1. Accepting electrons from a hydroxyl ion.
2. Donating electrons to a chloride ion.
3. Donating electrons to a proton.
4. Accepting proton from water.

Q13. The tendency to behave as Lewis acid decreases as the size:

1. Increases.
2. Decreases.
3. Remains same.
4. First increases then decreases.

Q14. Borax is used as cleansing agent because on dissolving in water it forms:

1. Alkaline solution.
2. Acidic solution.
3. Bleaching solution.
4. Colloidal solution.

Q15. Percentage of lead in lead pencil is:

1. 0
2. 20
3. 80
4. 60

Q16. Which of the following is/are allotrope(s) of carbon?

1. Diamond.
2. Graphite.
3. Fullerene.
4. All of these.

Q17. SnCl₂ is good:

1. Reducing agent.
2. Oxidising agent.
3. Bleaching agent.
4. Dehydrating agent.

Q18. Which of the following is most metallic:

1. B
2. Al
3. Mg
4. K

Q19. All group-14 members when heated in oxygen form:

1. Monoxide.
2. Dioxide.
3. Trioxide.
4. Monoxide and dioxide both

Q20. Reaction of ammonia with diborane gives initially B H . 2NH which on further heating gives:

1. Borazine.
2. Borax.
3. Boric acid.
4. All of these.Click To View The Answer

Q21. Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron and sulphur, oxides of elements of which of the group (s) are
present in the mixture?

1. group 2.
2. groups 2, 13 and 14.
3. groups 2 and 13.
4. groups 2 and 14.

Q22. Graphite conducts electricity due to the:

1. Highly delocalised nature of t-electrons.
2. Highly localised nature of tt-electrons.
3. Highly polarised nature of tt-electrons.
4. None of the above.

Q23. On commercial scale CO is prepared by passage of steam over:

1. Hot coke.
2. Coal.
3. Diamond.
4. Graphite.

Q24. An aqueous solution of borax is:

1. Neutral.
2. Amphoteric.
3. Basic.
4. Acidic.

Q25. Boron possesses a high melting point among the elements of group-13 due to:

1. Very high electronegativity of B.
2. Very high ionisation energy of B.
3. Small size of B.
4. Strong bonding between individual atoms in the solid state.

Q26. The important mineral(s) of Al is/are:

1. Bauxite.
2. Cryolite.
3. Both (a) and (b)
4. None of these.