P- block elements are bright and frequently good conductors of electricity and heat due to their propensity to lose an electron. A p-block element such as gallium has some extraordinary features. It is a metal that can melt in your hand. Another p-block element, silicon, is a crucial component of the glass and is also one of the most significant metalloids in the p-block group.
Download Class 11 Chemistry Worksheet on Chapter 11 The p-Block Elements Set 4 PDF.
CBSE Class 11 Chemistry Chapter 11 The p-Block Elements– Set 4
Q-1: Which of the following is not a silicone’s property?
a) Water repellents
b) Effective electrical conductors
c) Stable towards heat
d) Non-toxic and chemically resistant
Q-2: Which of the following is a correct match?
a) C60 – Buckminsterfullerene
b) Na2B4O7.4H2O – Kemite
c) Yellow bead – Ti(BO2)2
d) All of the above
Q-3: Which of the following is the correct term used for the hydrides of boron?
a) Borazole
b) Borazine
c) Boranes
d) Borax
Q-4: White fumes appear around the bottle of anhydrous AlCl3 due to
a) AlCl3 decomposition
b) AlCl3 hydrolysis that releases H2 gas.
c) AlCl3 hydrolysis that releases Cl2 gas
d) AlCl3 hydrolysis that releases gaseous HCl
Q-5: The percentage of lead in a lead pencil is
a) Zero
b) 20
c) 30
d) 50
Q-6: How photosynthesis helps in the reduction of CO2 from the atmosphere?
Q-7: Give one method of preparation of Na2B4O7.
Q-8:
a) Give the chemical composition of the glassy bead.
b) Give the colour of the bead produced when glassy beads react with CuO.
Q-9: Why do the carbon family members, other than carbon, not create pπ–pπ bonds?
Q-10: Complete the following reactions.
- a) SiO2 + 4HF→
- b) \(\begin{array}{l}C(s) + H_{2}O (g) \overset{437-1237 K}{\rightarrow}\end{array} \)
- c) 2NaBH4 + I2 →
- d) \(\begin{array}{l}4HBO_{2}\overset{160^{o}C}{\rightarrow}\end{array} \)
Q-11: Give reasons for the following.
a) The first ionisation energy increases from Sn to Pb.
b) Diamond is a bad conductor of heat and electricity.
c) Basicity of orthoboric acid is one.
Q-12: Why does carbon show anomalous behaviour with the rest of the members of the family?
Q-13: What might be expected of the oxidising power of the elements when we transition through the period in the p-block?
Q-14: Are Al’s oxidation state and covalency in [AlCl(H2O)5]2+ the same?
Q-15: Predict the chemical formulae of the compounds that could be created by the following pairs of elements using the periodic table:
a) Silicon and bromine
b) Sulphur and aluminium
Q-16: Why does boron not form B3+ ions?
Q-17: Diamond is covalent yet has a high melting point. Why?
Q-18:
a) Give the structure of orthoboric acid and give its few physical properties.
b) Give the reaction of orthoboric acid with water.
Q-19: The first ionisation enthalpy (ΔiH) values of the third-period elements Na, Mg and Si are respectively 496, 737 and 786 kJ/mol. Predict whether the first ΔiH value for Al will be closer to 575 or 760 kJ/mol. Justify your answer.
Q-20: When calcium is burned with nitrogen, it creates a white powder that, when combined with enough water, dissolves to create a gas called X and an alkaline solution. A thin layer of solid (Y) is formed on the solution’s surface after exposure to air. Determine the substances (X) and (Y).
Download the PDF to access answers to the Chemistry Worksheet for Class 11 Chemistry Chapter 11 The p-Block Elements Set – 4.
