HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

What is the action of heat on potassium permanganate?

Define activation energy.

Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from 30 °C to 50 °C. (Given R = 8.314 JK⁻¹ mol⁻¹). 

The Zieglar-Natta catalyst is used in the preparation of _______.

(A) LDPE

(B) PHBV

(C) PAN

(D) HDPE

Write observed electronic configuration of elements from first transition series having half
filled d-orbitals.

Write the structure of melamine.

Write applications of co-ordination compounds in medicine and electroplating.

Derive the equation : W = - P_extAV

Write features of Ellingham's diagrams

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 acidified potassium dichromate on - KI 

An antifertility drug is -

(a) Novestrol

(b) Histamine

(c) Vernal

(d) Equanil

Explain only reaction mechanism for alkaline hydrolysis of tert-butyl bromide

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

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

Represent a cell consisting of Mg²⁺ | Mg half cell and Ag⁺
 | Ag half cell and write the cell reaction.
( `"E"_("Ag")^° = 0.799 "V", "E"_("Mg")^° = - 2.37 "V"`)

5 moles of helium expand isothermally and reversibly from a pressure 40 × 10^-5  N m^-2 to 4 × 10^-5 N m^-2  at 300 K. Calculate the work done, change in internal energy and heat absorbed during the expansion. (R = 8.314 J K^-1  mol^-1).

Write any ‘four points’ of difference between fluorine and other halogens.

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?