Plus Two / 12th Chemistry - Book Back Answers - Unit 2 - English Medium
Tamil Nadu Board 12th Standard Chemistry - Unit 2: Book Back Answers and Solutions
This post covers the book back answers and solutions for Unit 2 from the Tamil Nadu State Board 12th Standard Chemistry textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Unit 2 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
I. Multiple Choice Questions
1.
An aqueous solution of borax is
a)
neutral
b)
acidic
c)
basic
d)
amphoteric
Answer Key:
c)
basic
2.
Boric acid is an acid because its molecule
a)
contains replaceable H+ ion
b)
gives up a proton
c)
combines with proton to form water molecule
d)
accepts OH- from water, releasing proton.
Answer Key:
d)
accepts OH- from water, releasing proton.
3.
Which among the following is not a borane?
a)
B2H6
b)
B3H6
c)
B4H10
d)
none of these
Answer Key:
b)
B3H6
4.
Which of the following metals has the largest abundance in the earth's crust?
a)
Aluminium
b)
Calcium
c)
Magnesium
d)
Sodium
Answer Key:
a)
Aluminium
5.
In diborane, the number of electrons that accounts for banana bonds is
a)
six
b)
two
c)
four
d)
three
Answer Key:
c)
four
6.
The element that does not show catenation among the following p-block elements
is
a)
Carbon
b)
silicon
c)
Lead
d)
germanium
Answer Key:
c)
Lead
7.
Carbon atoms in fullerene with formula C60 have
a)
sp3 hybridised
b)
sp hybridised
c)
sp2 hybridised
d)
partially sp2 and partially sp3 hybridised
Answer Key:
c)
sp2 hybridised
8.
Oxidation state of carbon in its hydrides
a)
+4
b)
-4
c)
+3
d)
+2
Answer Key:
a)
+4
9.
The basic structural unit of silicates is (NEET)
a)
(SiO3)2-
b)
(SiO4)2-
c)
(SiO)-
d)
(SiO4)4
Answer Key:
d)
(SiO4)4
10.
The repeating unit in silicone is
a)
SiO2
b) %20-%20English%20Medium%20Guides.png)
c) %20-%20English%20Medium%20Guides.png)
d)
%20-%20English%20Medium%20Guides.png)
Answer Key:
b) %20-%20English%20Medium%20Guides.png)
11.
Which of these is not a monomer for a high molecular mass silicone polymer?
a)
Me3 SiCI
b)
PhSiCl3
c)
MeSiCl3
d)
Me2 SiCl 2
Answer Key:
a)
Me3 SiCI
12.
Which of the following is not sp2 hybridised?
a)
Graphite
b)
graphene
c)
Fullerene
d)
dry ice
Answer Key:
d)
dry ice
13.
The geometry at which carbon atom in diamond are bonded to each other is
a)
Tetrahedral
b)
hexagonal
c)
Octahedral
d)
none of these
Answer Key:
a)
Tetrahedral
14.
Which of the following statements is not correct?
a)
Beryl is a cyclic silicate
b)
Mg2SiO4 is an orthosilicate
c)
SiO44- is the basic structural unit of silicates.
d)
Feldspar is not aluminosilicate
Answer Key:
d)
Feldspar is not aluminosilicate
15.
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
]8H 2 O
|
|
D
|
Borax
|
4
|
SiO2
|
|
|
A
|
B
|
C
|
D
|
|
(a)
|
2
|
1
|
4
|
3
|
|
(b)
|
1
|
2
|
4
|
3
|
|
(c)
|
2
|
2
|
3
|
3
|
|
(d)
|
None of these
|
|||
Answer Key:
a) A-b , B-1 , C-4 , D-3
16.
Duralumin is an alloy of
a)
Cu, Mn
b)
Cu, Al, Mg
c)
Al, Mn
d)
Al, Cu, Mn, Mg
Answer Key:
d)
Al, Cu, Mn, Mg
17.
The compound that is used in nuclear reactors as protective shields and control
rods is
a)
Metal borides
b)
metal oxides
c)
Metal carbonates
d)
metal carbide
Answer Key:
a)
Metal borides
18.
The stability of +1 oxidation state increases in the sequence
a)
Al < Ga < In < TI
b)
TI < In < Ga < Al
c)
In < TI < Ga < Al
d)
Ga < In < Al <T1
Answer Key:
a)
Al < Ga < In < TI
II. Short Answer Questions.
12th ChemistryIII. Long Answer Questions.
12th ChemistryIV. Exercise.
12th Chemistry
III. Long Answer Questions.
12th ChemistryIV. Exercise.
12th Chemistry
0 Comments:
Post a Comment