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Chapters
▶ 2: p-Block Elements - I
3: p-Block Elements - II
4: Transition and Inner Transition Elements
5: Coordination Chemistry
6: Solid State
7: Chemical Kinetics
8: Ionic Equilibrium
9: Electro Chemistry
10: Surface Chemistry
11: Hydroxy Compounds and Ethers
12: Carbonyl Compounds and Carboxylic Acids
13: Organic Nitrogen Compounds
14: Biomolecules
15: Chemistry in Everyday Life
![Samacheer Kalvi solutions for Chemistry - Volume 1 and 2 [English] Class 12 TN Board chapter 2 - p-Block Elements - I - Shaalaa.com](/images/chemistry-volume-1-and-2-english-class-12-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Chemistry - Volume 1 and 2 [English] Class 12 TN Board chapter 2 - p-Block Elements - I")
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Solutions for Chapter 2: p-Block Elements - I
Below listed, you can find solutions for Chapter 2 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Chemistry - Volume 1 and 2 [English] Class 12 TN Board.
Samacheer Kalvi solutions for Chemistry - Volume 1 and 2 [English] Class 12 TN Board 2 p-Block Elements - I Evaluation [Pages 53 - 55]
Choose the correct answer:
An aqueous solution of borax is ____________.
neutral
acidic
basic
amphoteric
Boric acid is an acid because its molecule ____________.
contains replaceable H+ ion
gives up a proton
combines with proton to form water molecule
accepts OH− from water, releasing proton
Which among the following is not a borane?
B2H6
B3H6
B4H10
none of these
Which of the following metals has the largest abundance in the earth’s crust?
Aluminium
Calcium
Magnesium
Sodium
In diborane, the number of electrons that accounts for banana bonds is ____________.
six
two
four
three
The element that does not show catenation among the following p-block elements is ____________.
Carbon
Silicon
Lead
Germanium
Carbon atoms in fullerene with formula C60 have ____________.
sp3 hybridised
sp hybridised
sp2 hybridised
partially sp2 and partially sp3 hybridised
Oxidation state of carbon in its hydrides
+4
−4
+3
+2
The basic structural unit of silicates is
\[\ce{(SiO3)}^{2-}\]
\[\ce{(SiO4)}^{2-}\]
\[\ce{(SiO)}^{-}\]
\[\ce{(SiO4)}^{4-}\]
The repeating unit in silicone is
\[\ce{SiO2}\]
\[\begin{array}{cc} \ce{R}\phantom{.....}\\ |\phantom{......}\\ \ce{-Si-O -} \phantom{}\\ |\phantom{......}\\\ \phantom{}\ce{R\phantom{......}}\phantom{}\end{array}\]
\[\begin{array}{cc} \ce{}\phantom{...}\\ |\phantom{....}\\ \ce{R-O-Si-O} \phantom{.......}\\ |\phantom{....}\\\ \phantom{}\ce{R\phantom{....}}\phantom{}\end{array}\]
\[\begin{array}{cc} \ce{}\phantom{}\\ |\phantom{..........}\\ \ce{-Si-O-O-R} \phantom{.}\\ |\phantom{..........}\\\ \phantom{}\ce{R\phantom{..........}}\phantom{}\end{array}\]
Which of these is not a monomer for a high molecular mass silicone polymer?
Me3SiCl
PhSiCl3
MeSiCl3
Me2SiCl2
Which of the following is not sp2 hybridised?
Graphite
Graphene
Fullerene
Dry ice
The geometry at which carbon atom in diamond are bonded to each other is ____________.
Tetrahedral
Hexagonal
Octahedral
None of these
Which of the following statements is not correct?
Beryl is a cyclic silicate
Mg2SiO4 is an orthosilicate
\[\ce{SiO4^{4-}}\] is the basic structural unit of silicates
Feldspar is not aluminosilicate
Match items in Column – I with the items of Column – II and assign the correct code.
| Column – I | Column – II |
| A. Borazole | 1. B(OH)3 |
| B. Boric acid | 2. B3N3H6 |
| C. Quartz | 3. Na2[B4O5(OH)4]8H2O |
| D. Borax | 4. SiO2 |
A - 2, B - 1, C - 4, D - 3
A - 1, B - 2, C - 4, D - 3
A - 1, B - 2, C - 3, D - 4
None of these
Duralumin is an alloy of ____________.
Cu, Mn
Cu, Al, Mg
Al, Mn
Al, Cu, Mn, Mg
The compound that is used in nuclear reactors as protective shields and control rods is ____________.
metal borides
metal oxides
metal carbonates
metal carbide
The stability of the +1 oxidation state increases in the sequence
Al < Ga < In < Tl
Tl < In < Ga < Al
In < Tl < Ga < Al
Ga < In < Al < Tl
Answer the following questions:
Write a short note on anomalous properties of the first element of the p-block.
Describe briefly allotropism in p-block elements with specific reference to carbon.
Give the uses of Borax.
What is catenation?
Describe briefly the catenation property of carbon.
Write a note on Fisher tropsch synthesis.
Give the structure of CO.
Give the structure of CO2.
Give the uses of silicones.
Describe the structure of diborane.
Write a short note on hydroboration.
Give one example for the following.
Icosogens
Give one example for the following.
Tetragen
Give one example for the following.
Prictogen
Give one example for the following.
Chalcogen
Write a note on the metallic nature of p-block elements.
Complete the following reaction.
\[\ce{B(OH)3 + NH3 ->}\]
Complete the following reaction.
\[\ce{Na2B4O7 + H2SO4 + H2O ->}\]
Complete the following reaction.
\[\ce{B2H6 + 2NaOH + 2H2O ->}\]
Complete the following reaction.
\[\ce{B2H6 +CH3OH ->}\]
Complete the following reaction.
\[\ce{BF3 + 9H2O ->}\]
Complete the following reaction.
\[\ce{HCOOH + H2SO4 ->}\]
Complete the following reaction.
\[\ce{SiCl4 + NH3 ->}\]
Complete the following reaction.
\[\ce{SiCl4 + C2H5OH ->}\]
Complete the following reaction.
\[\ce{B + NaOH ->}\]
Complete the following reaction.
\[\ce{H2B4O7 ->[Red hot]}\]
How will you identify borate radical?
Write a note on zeolites.
How will you convert boric acid to boron nitride?
A hydride of 2nd period alkali metal (A) on reaction with a compound of Boron (B) to give a reducing agent (C). identify A, B and C.
A double salt which contains fourth-period alkali metal (A) on heating at 500 K gives (B). aqueous solution of (B) gives white precipitate with BaCl2 and gives a red colour compound with alizarin. Identify A and B.
CO is a reducing agent. justify with an example.
Solutions for 2: p-Block Elements - I
Samacheer Kalvi solutions for Chemistry - Volume 1 and 2 [English] Class 12 TN Board chapter 2 - p-Block Elements - I
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Concepts covered in Chemistry - Volume 1 and 2 [English] Class 12 TN Board chapter 2 p-Block Elements - I are Group 13 (Boron Group) Elements, Group 14 (Carbon Group) Elements, General Trends in Properties of p-block Elements.
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