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  1. >>Class 11
  2. >>Chemistry
  3. >>Some p-Block Elements
Tough concepts made easy
4 min read

Some P-Block Elements

- Tough concepts are extra-simplified for you.
1
Anomalous Properties of Boron
The analysis of previous year papers tell us that this is a very important topic and a lot of questions are asked.
This topic can be tough because we normally think that all elements of one group have similar properties and this may lead us to marking the answer incorrectly in exams.
To avoid this, we should be clear about a few things:
The first member in the p-block shows an anomalous behaviour and therefore, have properties different from other elements of the group.
This behaviour is due to :
  1. Its small size
  2. High ionisation enthalpy
  3. High electronegativity
  4. Absence of vacant d-orbital in its valence shell.
So, let's see the ways in which boron differs from other elements in this video in under a minute!
Anomalous Properties of Boron
1 min
Now it's time to practice
Which of the following species cannot exist?
A
B
C
D
Which of the following exhibit covalency only upto 4?
A
Boron
B
Aluminium
C
Thallium
D
Indium
2
Compounds of Boron
This is a very important topic for competitive exams. A lot of questions are asked from the structure and properties of boron compounds. The topic becomes tough when it comes recalling the structure of these compounds, coupled with understanding the 3centre-2electron bonds and 2 centre-2electrons bonds in diborane.
Watch this video that talks about three important boron compounds - Borax, orthoboric acid and diborane.
SOME IMPORTANT COMPOUNDS OF BORON
6 mins
Let's practice some questions
Which one of the following compounds does not belong to the family of boranes?
Hint: General formulae of boranes are
A
B
C
D
 undergoes substitution reaction with:
A
at
B
anhydrous
C
both A and B
D
at
3
Compounds of Carbon
Carbon dioxide and carbon monoxide are important compounds of carbon. These are formed when carbon burns in air(oxygen). Many questions in this topic are based on the preparation and chemical properties of these compounds.
As there are different methods of preparation like laboratory and industrial method, coupled with a variety of chemical reactions, it may get very difficult to recall all. To make it easy for you to prepare the topic before your exam, we have gathered all the important points from the topic.
So, here you go
Carbon Monoxide
It can be prepared by various methods. Some of them are listed below
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Producer gas and water gas are important industrial fuels.
Let's see the important properties of CO.
  • CO is used in extraction of metals from their oxides.
  • Carbon monoxide is highly poisonous in nature and this is due to its ability to form a complex with hemoglobin present in blood, preventing the transport of oxygen around the body which can lead to death.
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Carbon dioxide
Carbon dioxide can be prepared by different methods.
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Properties of Carbon dioxide
  1. Photosynthesis: The process by which green plants convert atmospheric in the presence of chlorophyll and sunlight into carbohydrate such as glucose. Plants make their food using this process.
  2. Acidic Nature: is acidic in nature and therefore, turns blue litmus red. It dissolves in water forming carbonic acid.
4
Backbonding explained
The concept of backbonding is extremely important from an examination point of view. Many questions are asked where we have to apply the concept to determine the bond length, bond angle and acidic strength of compounds.
Here is a video that explains the concept of backbonding in a very simple way. Watch it to learn better.
Back Bonding | Applying Concepts | Chemistry | JEE
10 mins