12th Standard Syllabus & Materials

12th Standard

TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard English Medium Chemistry Subject p - Block Elements - II Book Back 2 Mark Questions with Solution Part - I

Published on: 01/06/2021

QB365 provides detailed and simple solution for every Book back Questions in class 12 Chemistry Subject. It will helps to get more idea about question pattern in every book back questions with solution.

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

Take MCQ Chemistry Test

QB365 Student Learing Managemnet System

Std: 12th Standard - Chemistry

chapter: - Book back Questions

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 2

3 x 2 = 6

What is the hybridisation of iodine in IF₇? Give its structure.

Why fluorine is more reactive than other halogens?

Give the oxidation state of halogen in the following.
a) OF₂
b) O₂F₂
c) Cl₂O₃
d) I₂O₄

Generic 3

1 x 3 = 3

Give the uses of helium.

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 2

3 x 2 = 6

(i) sp³d³ hybridisation
(ii) Pentagonal bipyramidal structure.

(i) Fluorine is more electro negative than other halogens.
(ii) Because except fluorine all the other halogens have positive oxidation state.
(iii) It has high electron affinity character
Example:
\(\mathrm{Cl}_{2}\mathrm{O} \Rightarrow+1 \text { oxidation state }(\mathrm{Cl}) \)
\(\mathrm{OF}_{2} \Rightarrow-1 \text { oxidation state }(\mathrm{F})\)

(a) OF₂
+ 2 + 2(x) = 0
+2 = -2x
2 x = -2 ⇒ x = -1
(b) O₂F₂
2(+1) + 2x = 0
2x = -2
x = -1
(c) Cl₂O₃
2(x) + 3(-2) = 0
2x = +6
x = +3
(d) I₂O₄
2(x) + 4(-2) = 0
2x = +8
x = +4

Generic 3

1 x 3 = 3

(i) Helium is used to provide inert atmosphere in electric-arc welding of metals.
(ii) Helium has lowest boiling point hence used in cryogenics.
(iii) It is much less denser than air and hence used for filling air balloons.