Define the term half-life and Calculate the age of a bone discovered in an old graveyard whose carbon 14 count rate is found to be 120counts per year

Section A: Physical and General Chemistry

1. A: Define

i) A standard solution is a solution whose concentration is accurately known. It is typically prepared by dissolving a precisely weighed amount of a primary standard in a known volume of solvent.

ii) A disproportionation reaction is a type of redox reaction where a single element is simultaneously oxidized and reduced to form two different products.

1. B:

i) The indicator that can be used to mark the endpoint of this reaction is starch solution.

ii) The colour at the end point will be blue-black due to the formation of the starch-iodine complex.

iii) Calculate the molarity of the $\text{K