Question

An element X forms an oxide XO which turns red litmus blue. Identify X.

A A metal
B A non metal
C A metalloid
D A noble gas
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Answer 1

Answer:

A Nobel gas

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.I GUESS IT IS CORRECT......

The term pro forma is most often used to describe a practice or document that is provided as a courtesy or satisfies minimum requirements, conforms to a norm or doctrine, tends to be performed perfunctorily or is considered a formality.