1) The number of moles of Ca(OH)2 to be dissolved in 500 mL of solution to get a  solution of pH=10, assuming complete dissociation of Ca(OH)2

(ans 2.5 x 10^-5)

 

2) The compressibility factor "z" is greater than unity .  Then at NTP molar volume Vm in ltrs.   (ans Vm>22.4 )

 

3) At low pressure ranges, the vander waal's equation reduces to

(ans  z = 1--a/RTV)

 

4) The heat liberated due to the combustion of acetelene is 1305 kJ and the heats of formation of H2O (I) and CO2(g) are -285 and -393 kJ respectively.  Find the bond energy of (c=c) .  Given BE (C-H) = 415kJ  (H-H) = 436kJ and the heats of atomizatin Cg (s) is 715 kJ.  (ans 700 )

 

5) If bond moments for CH3OCH3 are mh-c=0.40D, mc-o = 0.7 D and dipole moment of CH3OCH3 is 1.30 D , then bond angle C-O-C in CH3OCH3 ( in degree unit and in 10^-1 order ) is (ans 1075 )