HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

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

Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol^-1.

(Given: R = 8.314 J K^-1 mol^-1)

Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol^-1.

(Given: R = 8.314 J K^-1 mol^-1)

Explain the preparation and uses of nylon-2-nylon-6.

How is glucose prepared from cane sugar (sucrose)?

Write the formula of the complex copper (II) hexacyanoferrate (II).

Draw the structures of the HClO₃.

How is glucose prepared by commercial method? How is peptide linkage formed?

How is glucose prepared by commercial method? How is peptide linkage formed?

The half life period of a first order reaction is 6. 0 h . Calculate the rate constant

Arrange the following oxyacids of chlorine in decreasing order of their thermal stability. Give reason.
 HOClO, HOCl, HClO₄, HOClO₂

Write chemical reaction to prepare the following polymer: Teflon

Write chemical reaction to prepare the following polymer :
Nylon - 6

Write the main constituents of dettol.

Write balanced chemical equation for the following :
Action of zinc dust on phenol.

In a first-order reaction A → product, 80% of the given sample of compound decomposes in 40 min. What is the half-life period of the reaction? 

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 .) 

How is glucose prepared from starch?

Answer the following in one or two sentences.

Which of the three types of packing used by metals makes the most efficient use of space and which makes the least efficient use?

Answer the following in one or two sentences.

Mention two properties that are common to both hcp and ccp lattices.