HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Define Semipermeable membrane

Explain the geometry of `[Co(NH_3)_6]^(3+)` on the basis of hybridisation. (Z of Co = 27)

Write chemical reactions for different steps in the manufacture of sulphuric acid by lead chamber process. Draw the structure of phosphorous pentachloride

Calculate the work done in the following reaction at 50°C. State whether work is done on the system or by the system.
`"SO"_2("g") + 1/2"O"_(2("g")) rightarrow "SO"_(3("g"))`

Define the following term:
isotonic solution

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 _______.

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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?

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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?

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What are isotonic and hypertonic solutions?

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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.

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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?