Hello ,

Brown ring test :

In brown ring test dilute FeSO4 is addedto an aqueous solution of nitrate ion.Concentrated H2SO4 is then added along the sided of the test tube. A brown ring is observed at the interface between the solution and H2SO4 layers indicates the presence of nitrate ion in the solution

NO3?  + 3Fe^+2 + 4H+ -----> NO + 3Fe^3+ + 2H2O

[Fe(H2O)6]^2+ + NO ------> [Fe(H2O)5(NO)]^2+ + H2O

Hello,

This Law of isomorphism or the law of isomorphism is the approximate law with suggest the Crystal composition that is composed of same number of similar elements tend to demonstrate isomorphism. This law can also be stated that the substances which have similar composition and same crystal structure with constant elctronic configuration are said to be isomorphous substances.

I hope your question has been answered properly.

All the best!

THERMAL Stability of alkaline metal carbonates and Alkaline earth metal carbonates

Group 2 -BeCO3<MgCO3<CaCO3 <SrCO3<BaCO3

Group 1 -Li2CO3<Na2CO3<KCO3<Rb2CO3<Cs2CO3

Li2CO3 Decomposes easily on heating to give CO2

Li2CO3 → Li2O + CO2

All other Group 1 elements can be easily decomposed.

GROUP 2 elements can be decomposed : Only more heat is required as we move down

Hope This Helps

Hello Student

CrO5 , also known as Chromium peroxide is synthesized in the following way from Potassium Dichromate:

KCr2O7 + H2SO4 + 4H2O2 -------Ice Cold Ether-----> K2SO4 + 2CrO5 + 5H2O

Note : Ether Stabilises CrO5 .

It is blue in colour and has butterfly structure .

Chromium is in +6 Oxidation state in CrO5.

Hello Student ,

Heat and pH have the following effects on Potassium Dichromate

Effect of Heat on K2Cr2O7 (Oxidation State of Cr remains constant)

4K2Cr2O7 ----Heat----> 4K2CrO4 + 2Cr2O3 + 3O2

Effect of pH on K2Cr2O7 (Oxidation State of Cr Remains Constant)

1. Cr2O7^ 2- + H2O ---pH = 8----> CrO4^ 2- + 2H+
2. CrO4^ 2- + 2H+ ---pH = 4----> Cr2O7^ 2- + H2O

Please note the Oxidation number of Cr is constant in both the cases .

Hello Student,

• Oxidane is the IUPAC name of the compound we are most familiar with i.e Water or H2O
• Azane is the IUPAC name of Ammonia or NH3
• Phosphane , is the IUPAC name of PH3 Which also belongs to group 15 like NH3.

The IUPAC name are not used commonly.

Hello Student ,

H2O2 or oxygenated water can be prepared in the following ways : -

1. Merk's Method - Na2O2 + H2SO4(Ice Cold, 20%) = Na2SO4 + H2O2
2. Laboratory Method - 3[BaO2.8H2O] + 2H3PO4 = Ba3(PO4)2 +  3H2O2 + 24H2O
3. Electrolysis of Cold 50% H2SO4
4. Other - BaO2.8H2O + H2O + CO2 = BaCO3 + H2O2 + 8H2O

Hello Student,

From Water H2 preparation can mainly be done in two ways , which are as follows :-

By Action of Metals, Na, K , Mg , Zn ,Fe etc .

1. 2Na + 2H2O = 2NaOH + H2
2. Mg + H2O(Boiling Water) = MgO + H2

By Action of hydrides , NaH , CaH2 etc

1. CaH2 + 2H2O = Ca(OH)2 + 2H2

Hope this helps .

• Cengage inorganic chemistry.
  
• Concise inorganic chemistry by JD lee.