In the following question, some parts of the sentence may error. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select ‘No Error’.  Clean air scatters blue light much than red wavelength, (1)/ and so the midday (2)/ sky appears blue. (3) No Error (4) 

 In the following question, some parts of the sentence may error. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select ‘No Error’.  Clean air scatters blue light much than red wavelength, (1)/ and so the midday (2)/ sky appears blue. (3) No Error (4)  Correct Answer 1

The error is in part 1 where the correction should be "Clean air scatters blue light much more than red wavelength".
Earlier due to the absence of the word "more", the sentence did not seem to be meaningful.

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