ISC Class 12 Chemistry Solved Question Paper 2010

Match the following:

Fill in the blanks by choosing the appropriate word / words from those given in the brackets: (benzoic acid, negative, positive, vapour, vapour pressure, benzal chloride, more, less, electropositivity, electronegativity, reducing, oxidising, basic, acidic, PCI₅, SOCl₂ phenol, water, ice.)

(i) When water freezes to_______the free energy of the system is_______.

(ii) The_________pressure of an aqueous solution of 0.1 M cane sugar is________than that of pure water.

(iii) When benzaldehyde reacts with_______it forms_________and POCl₃.

(iv) An aqueous solution of a mixture of ammonium chloride and ammonium hydroxide is a________buffer solution with pH_______than seven.

(v) Halogens are strong_______agents because of their high

Complete the following statements by selecting the correct alternative from the choices given:
The hybridization of the iron atom in [Fe(CN)₆I^-3 complex is:

• sp³

• d^ssp³

• sp^sd²

• sp^sd²

Complete the following statements by selecting the correct alternative from the choices given:
The product formed when aniline is warmed with chloroform and caustic potash is:

• Phenyl chloride

• Methyl isocyanide

• Phenyl isocyanide

• Phenyl isocyanide

Complete the following statements by selecting the correct alternative from the choices given:For a dissociated solute in solution the value of van’t Hoff factor is:

For a dissociated solute in solution the value of van’t Hoff factor is:

• Zero

• One

• Greater than one

• Greater than one

Complete the following statements by selecting the correct alternative from the choices given:

The unit of equivalent conductance is: 

• Ohm^-1cm²equiv^-1

• Ohm^-1cm²gm^-1

• Ohm cm² equiv^-1

• Ohm cm² equiv^-1

Complete the following statements by selecting the correct alternative from the choices given:

An example of intensive property is:

• Number of moles

• Mass

• Volume

• Volume

Answer the following questions:

The reduction potential of a metal X is - 0.76 volts while that of Y is - 2..38 volts which of the two metals is a stronger reducing agent? Give a reason for your answer.

Answer the following questions:

The osmotic pressure of a 0.25 M urea solution is 2.67 atm. What will be the osmotic pressure of a 0.25 M solution of Potassium Sulphate?

Answer the following questions:

Name the type of isomerism exhibited by lactic acid, CH₃CH(OH)COOH giving the reason for your answer.