If "air" is called "green", "green" is called "blue", "blue" is called "sky", "sky" is called "yellow", "yellow" is called "water" and "water" is called "pink", then what is the colour of a clear sky in this coded naming system?

Introduction / Context:
This problem again plays with renaming familiar words. Instead of changing the physical colour, it changes the label that we use for that colour. You must track how the colour name for the sky is altered in the new code language.

Given Data / Assumptions:
The mappings are:
"air" → green.
"green" → blue.
"blue" → sky.
"sky" → yellow.
"yellow" → water.
"water" → pink.
We know from real world knowledge that a clear sky is blue in colour.

Concept / Approach:
We first identify the true colour of a clear sky (blue), then see which coded word now stands for that colour. The point is not to follow the chain all the way to pink but to stop at the place where the real colour is matched. This is different from the previous question, so careful reading is important.

Step-by-Step Solution:
Step 1: A clear sky is actually blue. Step 2: In the code, "green" is called "blue". That tells us that the real thing which used to be called green is now labelled blue. Step 3: We need the label for blue itself. According to the mapping, the word "blue" is now used to denote "sky". Step 4: Therefore, when people in this coded language look at a blue sky, the label they use for the colour is "sky".

Verification / Alternative check:
If you try to continue the chain (sky → yellow → water → pink), you would be moving away from the actual colour of the sky instead of naming it. The question is strictly about the colour of sky, not about where the word "sky" has been reassigned. The direct mapping for the real colour blue is the step where "blue" is called "sky".

Why Other Options Are Wrong:
"Blue" is again the physical colour rather than the new coded name. "Yellow" and "Water" occur later in the chain and do not directly label the colour blue. Hence they do not represent the spoken colour name for the sky under the new scheme.

Common Pitfalls:
A common mistake is to run through the entire chain of mappings and answer with the last word "pink". That would only be correct if the question had asked, "what is the new word for the old word 'sky'?" Instead, here we are asked for the colour of the sky in the new naming system, which is a subtler question.

Final Answer:
In this coded language, the colour of a clear sky is named Sky.