In preparing the standard curve to determine the concentration of an unknown solution of phenol red, will different results be obtained by plotting the absorbance of a solution against the final phenol red concentration of the solution in the cuvette or by diluting a constant volume of a phenol red of known concentrations with a constant volume of buffer and plotting the absorbance against the phenol red concentration of the sample prior to dilution

just did the assignment and the answer was #1 +2 n

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

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.