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

Explain the trends in the following atomic properties of group 16 elements:

Electronegativity

Explain the trends in the following atomic properties of group 16 elements:

Electron gain enthalpy

Polonium has the half-Life of ______.

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)

Write four points of differences between properties of nitrogen and other elements of group 15.

The element that does NOT exhibit allotropy is

1. As
2. Sb
3. Bi
4. N

Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements.

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.