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

Define the following term:

Hypotonic solution

Write chemical equation for the following :
Hell - Vohlard - Zelinsky reaction

Write structure and molecular formula for the following compounds:
a. Orthophosphoric acid 
b. Sulphurous acid

What are racemates?

Write the formula for pentaamminechlorocobalt (III) sulphate. 

Choose the most correct option.

In calculating osmotic pressure the concentration of solute is expressed in _______.

Choose the most correct option.

A living cell contains a solution which is isotonic with 0.3 M sugar solution. What osmotic pressure develops when the cell is placed in 0.1 M KCl solution at body temperature?

Choose the most correct option.

The osmotic pressure of blood is 7.65 atm at 310 K. An aqueous solution of glucose isotonic with blood has the percentage (by volume)________.

Answer the following in one or two sentences.

What is osmotic pressure?

Answer the following in one or two sentences.

A solution concentration is expressed in molarity and not in molality while considering osmotic pressure. Why?

Answer the following.

What are isotonic and hypertonic solutions?

Answer the following.

A solvent and its solution containing a nonvolatile solute are separated by a semipermeable membrane. Does the flow of solvent occur in both directions? Comment giving a reason.

Answer the following.

The osmotic pressure of CaCl₂ and urea solutions of the same concentration at the same temperature are respectively 0.605 atm and 0.245 atm, calculate van’t Hoff factor for CaCl₂.

Answer the following.

Explain reverse osmosis.

Answer the following.

How molar mass of a solute is determined by osmotic pressure measurement?

An aqueous solution of a certain organic compound has a density of 1.063 g mL^-1 , osmotic pressure of 12.16 atm at 25 °C and a freezing point of 1.03 °C. What is the molar mass of the compound?

Select the most appropriate option.

Which of the following reactions is exothermic?

Answer the following in one or two sentences.

What is standard state of a substance?

Answer in brief.

How will you calculate reaction enthalpy from data on bond enthalpies?

Answer in brief.

What is the standard enthalpy of combustion? Give an example.