HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Important Questions for Chemistry

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

Which of the following compounds contain S = O as well as S = S bonds?

(A) Sulphuric acid

(B) Thiosulphuric acid

(C) Sulphurous acid

(D) Thiosulphurous acid

a. Explain the trends in the following properties with reference to group 16:

1 Atomic radii and ionic radii

2 Density

3 ionisation enthalpy

4 Electronegativity

b. In the electolysis of AgNO₃ solution 0.7g of Ag is deposited after a certain period of time. Calulate the quantity of electricity required in coulomb. (Molar mass of Ag is 107.9g mol^-1)

What is molecular formula of oleum?

(a) H₂SO₃

(b) H₂SO₄

(c) H₂S₂O₇

(d) H₂S₂O₈

Write the electronic configuration of the following elements:

Sulphur (Z = 16)

What is the action of concentrated sulphuric acid on phosphorous pentachloride

3.795 g of sulphur is dissolved in 100g of CS₂. This solution boils at 319.81 K. What is the molecular formula of sulphur in solution? The boiling point of CS₂ is 319.45 K. (Given that K_b for CS₂ = 2.42 K kg mol^-1 and atomic mass of S = 32)