A student prepared hydrogen chloride gas...

A student prepared hydrogen chloride gas by treating sodium chloride with concentrated sulphuric acid in a test tube. He held a strip of dry blue litmus paper in `HCl` gas coming out the test tube. The student observed that ton coming in contact with `HCl` gas, the colour of blue litmus paper:

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A student prepared hydrogen chloride gas by treating sodium chloride w...
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Why does dry HCl gas not change the colour of the dry litmus paper?
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A student prepared hydrogen chloride gas by treating sodium chloride w...
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Can dry hydrogen chloride gas turn a blue litmus paper red ?
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शुद्ध एवं शुष्क HCl गैस शुष्क नीले लिटमस पत्र को लाल करता है ।
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Why does dry HCl gas not change the colour of the dry litmus.
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Why does dry HCl gas not change the colour of the dry litmus paper?
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Why does dry HCl gas not change the colour of the dry litmus paper ?
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Why does dry HCl gas not change the colour of the dry litmus paper?
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