Question 1
a. mention two advantages and two disadvantages of instrumental methods of analysis
b. state 2 properties of electromagnetic radiation (emr)
c. an emr makes one complete oscillation in 12 seconds. if the frequency of oscillatien is
0.0833hz calculate the following:
(i) wavelength (ii) angular velocity (iii) photon energy of the radiation
(c = 3.0 x 109 m/s, h = 6.626 x 102).s, n = 22 of 3.142)

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

answer///carbon;