HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions

Write the structure of HClO₄.

Write the chemical composition of cryolite.

Draw the structure of the following compound:

Peroxy disulphuric acid

Explain anomalous behaviour of oxygen in group 16 with respect to:

1. Atomicity
2. Magnetic property
3. Oxidation state

Give reason:

Bleaching action of ozone is also called dry bleach.

Write the chemical reaction when chlorine reacts with dry slaked lime.

Draw the structure of peroxymonosulphuric acid. 

Arrange the following in the increasing order of the property mentioned:

\[\ce{HOCl}\], \[\ce{HClO2}\], \[\ce{HClO3}\], \[\ce{HClO4}\] (acidic strength)

Arrange the following in the increasing order of the property mentioned:

\[\ce{HF}\], \[\ce{HCl}\], \[\ce{HBr}\], \[\ce{HI}\] (thermal stability)

The hybridisation of phosphorus in phosphorus pentachloride is _______.

(A) dsp³

(B) sp³ d

(C) d² sp³

(D) sp³ d²

Describe the laboratory method of preparation of ammonia

What is the action of hot/concentrated nitric acid on - Arsenic   

Draw the structure of: Orthophosphoric acid 

Draw structure and write geometry of PCl₃ and PCl_5.

What is the action of Excess of air on ammonia ?

What is the action of the following reagents on ammonia : 
Nessler's reagent

Explain brown ring test with the help of chemical equation

Write balanced chemical equations for action of potassium permanganate on: Hydrogen

Draw the structure of: Pyrophosphoric acid

Fe2+ ions react with nitric oxide formed from reduction of nitrate and yields a brown  coloured complex _____________.