Graph Colouring

How many unique colors will be required for proper vertex coloring of a complete graph having n vertices?

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Minimum number of colors required for proper edge coloring of a graph is called?
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The minimum number of colours required to properly vertex-colour a complete graph (K_n) with n vertices is:
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A bipartite graph can always be properly vertex-coloured with
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Which of the following algorithms can be used to find a valid vertex colouring of a graph (it might not be the minimum number of colours)?
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What is the chromatic number of a cycle graph with n vertices where n is odd?

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What is Vizing's theorem about edge coloring?
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What is the Hadwiger conjecture in graph coloring?
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What is the relationship between perfect graphs and graph coloring?
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