Physics · Materials: Metals and Non-Metals
एक तत्व 'X' विद्युत का कुचालक है। यह ऑक्सीजन में जलकर एक गैस बनाता है जो पानी में घुल जाती है, और प्राप्त विलयन नीले लिटमस पत्र को लाल कर देता है। तत्व 'X' है:
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