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| **test** | **observation** | **inference** | |----------|-----------------|---------------| | **i. c + H₂O₂ + Litmus Paper** | Dissolves to produce a colorless filtrate, litmus turns blue to red | ? | | **ii. 1st Portion + BaCl₂ + HNO₃ + Heat** | ? | ? | | **iii. 2nd Portion + NaOH (drop and excess)** | White precipitate insoluble
Accepted Answer
The observations suggest the following inferences:
i. C + H₂O₂ + Litmus Paper
Inference: The reaction of carbon (C) with hydrogen peroxide (H₂O₂) likely produces an acidic solution, causing the blue litmus paper to turn red.
ii. 1st Portion + BaCl₂ + HNO₃ + Heat
Observation: The reaction of the filtrate with barium chloride (BaCl₂) and nitric acid (HNO₃) in the presence of heat is likely to form a white precipitate, indicating the presence of sulfate ions (SO₄²⁻) from the oxidation of carbon by hydrogen peroxide.
iii. 2nd Portion + NaOH (drop and excess)
Inference: The formation of a white precipitate insoluble in excess NaOH suggests the presence of a metal hydroxide, possibly barium hydroxide (Ba(OH)₂).
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