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A non-metal A which is the largest const...

 A non-metal A which is the largest constituent of air, when heated with H2 in 1 : 3 ratio in the presence of catalyst (Fe) gives a gas B. 0n heating with `O_(2)` it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent. 
(a) Identify A, B, C and D.
(b) To which group of the periodic table does this non-metal belongs? 

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### Step-by-Step Solution: **Step 1: Identify Non-metal A** - The question states that non-metal A is the largest constituent of air. The primary component of air is nitrogen (N2), which makes up about 78% of the atmosphere. **Answer: A = Nitrogen (N2)** **Step 2: Reaction of A with H2** ...
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