HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Important Questions for Chemistry

Define Freezing point.

The temperature at which vapour pressure of a liquid becomes equal to the atmospheric
pressure is _______.

(A) melting point

(B) boiling point

(C) 273 K

(D) 373 K

Which mixture is used for respiration by deep sea divers?

(A) He + O₂

(B) Ne + O₂

(C) Ar + O₂

(D) Kr + O₂

How does solubility of a gas in water varies with the temperature?

Derive the relation ∆H − ∆U = ∆nRT.

When KOH solution is added to potassium dichromate solution the colour of solution
changes to yellow, because _______

(A) chromate ion changes to dichromate ion

(B) dichromate ion changes to chromate ion

(C) oxidation number of chromium changes from + 6 to + 4

(D) oxidation number of chromium changes from + 4 to +6

How van’t Hoff factor is related to the degree of dissociation?

Which of the following 0.1 M aqueous solutions will exert the highest osmotic pressure?

Which of the following 0.1 M aqueous solutions will exert the highest osmotic pressure?

Derive the relation between the elevation of boiling point and molar mass of solute.

Define Semipermeable membrane

Define Semipermeable membrane

22.22 gram of urea was dissolved in 300 grams of water. Calculate the number of moles of urea and molality of the urea solution. (Given: a Molar mass of urea = 60 gram mol^-1)

Derive van’t Hoff general solution equation.

Derive van’t Hoff general solution equation.

Define the following terms : 
a. Cryoscopic constant
b. Resistivity 

Define the following term:

Hypotonic solution

Define the following term:

Hypotonic solution

What is the freezing point of a liquid? The freezing point of pure benzene is 278.4 K. Calculate the freezing point of the solution when 2.0 g of a solute having molecular weight 100 g mol^-1
 is added to 100 g of benzene.
( K_f of benzene = 5.12 K kg mol^-1 .) 

4.0 grams of NaOH ( Molar mass = 40.0 g mol^-1 ) is dissolved in 500 cm³ of water. What is the molarity of NaOH solution?