- Online Test Series
- Final Revision Module (3 Books)
- 5 Mock Tests
- 5 Diagnostic Tests
- 15 Practice Tests
- Sample Papers With Solutions
- Past Year Papers with Solutions
- Ask The Expert
- On Call Mentorship
Molecular/Addition compounds are formed when stoichiometric amounts of two or more simple compounds join together. Molecular/Addition compounds are of two types.
Double salts: Those which don't retain their identity in solutions are called double salts.
KCl + MgCl2 + 6H2O → KCl.MgCl2. 6H2O
K2SO4 + Al2 (SO4)3 + 24 H2O → K2SO4.Al2 (SO4)3.24H2
Complex compounds: Those which retain their identity in solution (complexes).
CuSO4 + 4 NH3 → CuSO4.4NH3 or [Cu (NH3)4] SO4
tetrammine copper (II) sulphate
Fe (CN) 2 + 4 KCN → Fe(CN)2. 4KCN or K4[Fe (CN)6]
When crystals of carnallite are dissolved in water, the solution shows properties of K+, Mg2+ and Cl– ions. In a similar way, a solution of potash alum shows the properties of K+, Al3+ and SO42– ions. These are both examples of double salts which exist only in the crystalline state. When the other two examples of coordination compounds are dissolved they do not form simple ions, Cu2+/Fe2+ and CN–, but instead their complex ions are formed.
Representation of complex Ion:
M=Central Metal atom/ion (usually of d-block)
n±=charge on coordination
Outside region apart from coordination sphere is called ionisation sphere.
Ligands can be of following types depending on the number of donor atoms present in them.
By learning in meritnation I got B2, but by learning topper learning I got A1... so which is the best. This is awesome to learn and easy to study science. At 1st term I got B2 but at 2nd term I got A1.
Manoj Vijay CBSE class IX
Excellent Faculty! I have been studying from topperlearning.com since Class IX and have consistently scored above 90% in my these 4 years.I studied throughout nights to achieve my goal.Moreover, becoming Rank 1 on topperlearning boosted my confidence to high skies.Thank you topperlearning, without you I would not have been able to score 91.2% in Class XII Boards(2015) and CGPA 9.8 in my Class X Boards(2013). Hope that topperlearning will continue to help students throughout India, creating a brighter future for them. Regards, Vivek Saahil
Vivek Saahil CBSE class XII Science
I like topper learning because I can understand the level I have prepared for my subject and study better.
Mohanapriya Saravanakumar CBSE class X
Topperlearning is really a very good helping tool. Every time I had doubts related to any concept in PCM I posted it and immediately my problem was solved. It also helped me in scoring good ranks in competitive exams too. The topper faculty is very good. The teachers explained each and every concept in depth. My favourite teacher is Physics teacher
Sahibdeep Singh Sodhi CBSE class XII Science
We all know that audio-visual medium is a better way of explaining and educating the students. It not only makes learning fun but also gives the message more clearly and precisely. Topper is a very good amalgamation of good teaching and good learning methods.
Sonia Malik, Professor
VV DAV School, New Delhi class ALL Class
Queries asked on Sunday and after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.