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

What is the action of dioxygen on Carbon disulfide

Write the molecular and structural formulae of Dithionous acid

Write chemical reactions for different steps in the manufacture of sulphuric acid by lead chamber process. Draw the structure of phosphorous pentachloride

Explain the following properties of group 16 elements :
1) Electro negativity
2) Melting and boiling points
3) Metallic character
4) Allotropy

What are oxides?  Write different types of oxides with one example each.

Write structure and molecular formula for the following compounds:
a. Orthophosphoric acid 
b. Sulphurous acid

Write the formula for pentaamminechlorocobalt (III) sulphate. 

Write uses of sulphur.

Write the reaction of conc. H₂SO₄ with sugar. What is the role of H₂SO₄ in this reaction?

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

1. Atomicity
2. Magnetic property
3. Oxidation state

Write two uses of dioxygen.

Explain the structure of ClF₃

Iodine exists as

• polar molecular solid
• ionic solid
• nonpolar molecular solid
• hydrogen bonded molecular solid

Draw structure of Chlorine trifluoride

Write ‘four’ uses of hydrochloric acid.

Write chemical formula of the following oxoacids of chlorine:

a. Hypochlorous acid

b. Chlorous acid

c. Chloric acid

d. Perchloric acid

Draw structure of Chlorine pentafluoride

Describe anomalous behaviour of fluorine with the other elements of group 17 wilh reference to :

(a) Hydrogen bonding

(b) Oxidation state

(c) Polyhalide ions

Arrange the following oxyacids of chlorine - HClO, HClO₂, HClO₃, and HClO₄ with respect to increasing order of thermal stability.

What happens when thin copper leaves are thrown in jar containing chlorine?