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If someone asks if China is proper they are asking if it is a proper noun. China is indeed a proper now and should be capitalized.
The noun china is a common noun, a china teacup or china dinnerware for example.
The noun China is a proper noun, the name of a specific country.
china is bigger
The pronoun that takes the place of the proper noun 'China' is it.
Example: China is a big country, it has a population of over 1.3 billion
Yes. It is a proper noun and is spelled "China."