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

Write chemical equation for the following :
Fischer esterificatione

Fill in the blanks by choosing the appropriate word/words from those given in the brackets:  

(iodoform, acetaldehyde, positive, greater, acidic, acetone, disaccharide, negative, increases, glucose, decreases, chloroform, polysaccharide, lactose, lesser, basic, cationic hydrolysis, anionic hydrolysis)

Sucrose is a _________ and yields upon hydrolysis, a mixture of ________ and fructose.

Give balanced equations for the following reactions:

Acetic anhydride with phosphorus pentachloride.

Give balanced equations for the following reactions:

Acetic anhydride with phosphorus pentachloride.

Write resonance structures of aniline. What is the action of benzene diazonium chloride on ethanol? 

What are the consequences of the Schottky defect in crystals?

What is an impurity defect? What are its types? Explain the formation of vacancies through aliovalent impurity with example.

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 in one or two sentences.

Write the equation relating boiling point elevation to the concentration of the solution.

Answer the following in one or two sentences.

What is the effect on the boiling point of water if 1 mole of methyl alcohol is added to 1 dm³ of water? Why?

Answer the following.

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.

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?

While considering boiling point elevation and freezing point depression a solution concentration is expressed in molality and not in molarity. Why?