Author: chemigod

Travel of Three Years of CHEMIGOD

REACHED IN 126 Countries with about 6,55,000 hits in three years. Many many thanks for showing your faith which inspired myself to continue this website which is only one person act, not of team. Happy New Year (2024) in Advance. May Almighty give you Health, Prosperity, Love and affection, Spirituality, Generosity, Loving Family and True Friends, Fulfil long awaited Dreams.

1 India
2 Pakistan
3 Nepal
4 United Arab Emirates
5 United States
6 Oman
7 Saudi Arabia
8 Kuwait
9 Bangladesh
10 Nigeria
11 American Samoa
12 Qatar
13 Australia
14 Singapore
15 Bahrain
16 Germany
17 Philippines
18 United Kingdom
19 Sri Lanka
20 Canada
21 China
22 France
23 Ireland
24 South Africa
25 Tanzania
26 Japan
27 European Union
28 Kenya
29 Belarus
30 Netherlands
31 Bhutan
32 Indonesia
33 Zambia
34 Rwanda
35 Malaysia
36 Egypt
37 Finland
38 Uzbekistan
39 Unknown Region
40 Ghana
41 Mexico
42 Grenada
43 Iraq
44 Sierra Leone
45 Thailand
46 Ethiopia
47 Sweden
48 Poland
49 Uganda
50 Belgium
51 Fiji
52 Turkey
53 Vietnam
54 Colombia
55 Mauritius
56 Austria
57 Switzerland
58 Kyrgyzstan
59 Russia
60 Botswana
61 Spain
62 Taiwan
63 Angola
64 Myanmar (Burma)
65 Sudan
66 Cambodia
67 South Korea
68 Italy
69 Jamaica
70 Ecuador
71 Hungary
72 Trinidad & Tobago
73 Bulgaria
74 Namibia
75 Eritrea
76 Luxembourg
77 Portugal
78 Lebanon
79 Puerto Rico
80 Hong Kong SAR China
81 Kazakhstan
82 Zimbabwe
83 Afghanistan
84 Lesotho
85 Liberia
86 Czechia
87 Serbia
88 Brazil
89 Papua New Guinea
90 Ukraine
91 Malawi
92 Cyprus
93 Belize
94 Algeria
95 Norway
96 Antigua & Barbuda
97 Guyana
98 Iran
99 Libya
100 Bosnia & Herzegovina
101 Côte d’Ivoire
102 Cameroon
103 Yemen
104 Jordan
105 Mongolia
106 Croatia
107 Niger
108 Armenia
109 Gabon
110 Chile
111 New Zealand
112 Somalia
113 North Macedonia
114 Réunion
115 St. Lucia
116 Georgia
117 Romania
118 Solomon Islands
119 Moldova
120 Maldives
121 Gambia
122 Congo – Kinshasa
123 Israel
124 Seychelles
125 Greece
126 Palestinian Territories

Thanks all of you again to motivate to work again sincerely.

d-d Transition

What is d-d transition ? (From d & f block elements )
Answer:- The electronic transition between two energy levels of d orbital is called d-d transition. Movement of electron from one d orbital to other d orbital having different energy.

Where does d-d transition occur ?
Ans:- d-d transition is found in complex compounds ( or Coordination compounds ). Complex compound is made up of two entities – one is central metal atom / ion and other is Ligand (electron donor molecule or atom or ion )

Why d-d transition occur in place of simple electronic transition occurs between different shells?

Answer:- In coordination / complex compounds d subshell containing five d orbitals split into two parts (t2g and eg ) under influence of ligand field.
In octahedral complex / coordination compounds d subshell is splited into two energy level: one is of lower energy called t2g energy level containing three d orbital dxy, dyx and dzx and other is of higher energy level called eg energy level containing two d orbitals d x2-y2 and dz2

Why complex / coordination compounds are coloured ?
In coordination / complex compound, When electron present in one of t2g orbital absorb fixed amount of energy ( absorb particular frequency or wavelength of white light ) and moves to one of eg orbital than complementary light is reflected which we see through our eyes.
e.g. CuSO4.5H2O is blue in coloured,
Sodium chromate is yellow in coloured.
Sodium dichromate is Orange in coloured
[Cu (H2O)4]2+ absorb at 600nm means Red colour and complementary colour we see is Green.

NEW CBSE Pattern of Question Paper of Class 9 &10 for Session 2023-24

The changes for classes IX-X (2023-24) year-end Board Examinations are as under:

Particulars
Particulars Academic Session 2022-23 Academic Session 2023-24 Composition question paper year-end
examination/ Board
Examination (Theory)

Academic Session 2022-23 Competency Based Questions are 40% in the form of Multiple-Choice Questions, Case Based Questions, Source Based Integrated Questions or any other type.
Objective Questions are 20%
Remaining 40% Questions are Short Answer/ Long Answer
Questions

Academic Session 2023-24
Competency Focused Questions in the form of MCQs/Case Based Questions, Source-based Integrated Questions or any other type = 50%

Select response type
questions(MCQ) = 20%
Constructed response questions (Short Answer/ Long Answer type Questions, as per existing pattern) =30%

NEW CBSE Question Paper Pattern for 9, 10,11 & 12 Session- 2023-24

Download CBSE Circular of NEW Pattern_2023Download

NEW CBSE Pattern of Question Paper of Class 11 & 12 for Session 2023-24

Particulars
Composition of question paper year-end examination/
Board Examination (Theory)

Academic Session 2022-23
Competency Based Questions are 30% in the form of Multiple-Choice Questions, Case Based Questions, Source Based Integrated Questions or any
other type.
Objective Question are 20%

Remaining 50% Questions
are Short Answer / Long Answer Questions

Academic Session 2023-24
Competency Focused Questions in the form of MCQs/Case Based Questions, Source-based Integrated Questions or any other type = 40%


Select response type questions (MCQ) = 20%
Constructed response questions (Short Answer Questions/Long Answer type Questions, as per existing pattern) = 40%

NEW CBSE Question Paper Pattern for 9, 10,11 & 12 Session- 2023-24

Download CBSE Circular of NEW Pattern_2023Download