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

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 _____________.

How is phosphine prepared using the following reagent ?
HCl

Which of the following is a basic oxide?

(A) SiO₂

(B) P₄O₁₀

(C) MgO

(D) Al₂O₃

Calculate molarity and molality of 6.3% solution of nitric acid having density 1.04 g cm⁻³
. (H = 1, N = 14, O = 16)

Draw the structure of H₄P₂O₆ hypophosphoric acid

What is the action of Excess of chlorine on ammonia?

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