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

What is the action of Na Metal on ammonia? 

What is the action of the following reagents on ammonia :
Sodium metal

Explain why Mn²⁺ ion is more stable than Mn³⁺? (Given : Mn→ Z=25)

Write balanced chemical equations for action of potassium permanganate on Warm conc. sulphuric acid

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

How is phosphine prepared using the following reagent?

H₂SO₄

How is phosphine prepared using the following reagent?

Caustic soda

Write balanced chemical equations for Phosphorus reacts with magnesium

Write balanced chemical equations for Flowers of sulphur boiled with calcium hydroxide

Write balanced chemical equations for Action of ozone on hydrogen peroxide.

What is Nessler’s reagent?

What are neutral oxides?

The molecular formula H₂S₂O₂ represents which oxoacid?

• Hydrosulphurous acid
• Thiosulphurous acid
• Sulphuric acid
• Pyrosulphurous acid

Explain the structure of sulphur dioxide.

Write the molecular formula and structure of dithionic acid.

Write molecular formula and structure of Pyrosulphuric acid 

Write molecular formulae and structures of the Dithionous acid

What is the action of dioxygen on Calcium

The atomicity of sulphur in orthorhombic sulphur is______________ .

(a) 8                                

(b) 6                                 

(c)  4                                

(d)  2

Describe anomalous behaviour of oxygen as compared with other elements of group 16 with reference to -
(a) Magnetic property                                        
(b) Oxidation state
(c) Hydrides