There are six groups of p-block elements in the periodic table, numbered 13 to 18. Boron, carbon, nitrogen, oxygen, fluorine, and helium lead the groupings. Their electronic valence shell configuration is ns2 np1-6 (except for He). However, the inner core of the electronic configuration may differ. The variation in the element’s inner core significantly impacts its chemical and physical properties (such as ionisation enthalpy, atomic and ionic radii and so on). As a result, there is a lot of diversity in the attributes of elements in a group of p-blocks.
Download Class 11 Chemistry Worksheet on Chapter 11, The p-Block Elements Set 5 PDF.
CBSE Class 11 Chemistry Chapter 11 The p-Block Elements– Set 5
Q-1: Which of the following Group 14 elements has the lowest atomic volume?
a) Si
b) C
c) Sn
d) Ge
Q-2: Which of the following is an amorphous form of carbon?
a) Graphite
b) Lamp-black
c) Diamond
d) All of the above
Q-3: Which of the following types of graphite has an ABAB-type layer arrangement?
a) 𝜶-graphite
b) 𝜷-graphite
c) Both a) and b)
d) None of the above
Q-4: Conc. HNO3 is stored in containers made up of
a) Zinc
b) Aluminium
c) Tin
d) Copper
Q-5: Which of the following is not a protonic acid?
a) B(OH)3
b) PO(OH)3
c) SO(OH)2
d) SO2(OH)2
Q-6: Standard electrode potential values, EO for Al3+/Al is -1.66 V and +1.26 V for Tl3+/Tl. Predict the creation of the M3+ ion in solution and contrast the electropositive properties of the two metals.
Q-7: Boron is unable to form BF63– ion. Explain.
Q-8: Why is boric acid regarded as a weak acid?
Q-9: [SiF6]2– is known, whereas [SiCl6 ]2– is not. Give possible reasons.
Q-10: a) Give the electronic configuration of Ga.
b) Give the maximum covalency of boron.
Q-11: How do you account for BCl3‘s greater stability over TlCl3?
Q-12: Explain why the BCl3 molecule has no dipole moment if the B-Cl bond has one.
Q-13: What occurs when
(a) Borax is highly heated.
(b) Water is mixed with boric acid.
Q-14: Why are the melting point and boiling point of group 14 elements higher than group 13?
Q-15: a) Name the elements in the carbon family that cannot be affected by water.
b) Why +2 oxidation state is more predominant for lead compounds?
Q-16: a) State the tetranuclear unit formula found in borax.
b) Provide the correct borax formula.
c) What happens when it dissolves in water?
Q-17: Sort the following oxides as acidic, neutral and amphoteric.
SiO2, SnO, PbO, CO, CO2, GeO2
Q-18: a) What is the reason for the non-existence of PbI4?
b) Sort the following molecules as ionic and covalent.
SnF4, CCl4, PbF4, SiF4, SiCl2, GeF4
Q-19:
a) Which property of CO is used for the extraction of many metals from their oxides ores? Explain with the help of the reactions.
b) Why is CO involved in the formation of metal carbonyls?
Q-20: When heated, an orange solid A produces a green residue B, a colourless gas C, and water vapours. When dry gas C passes over heated magnesium, it produces a white solid D. When D and water mix, gas E is produced, which, when combined with HCl, produces dense, white vapours. List the reactions from A to E.
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