Which of the following salts release reddish brown gas when heated in a dry test tube ?

Which of the following salts release reddish brown gas when heated in a dry test tube ?
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Which of the following salts release reddish brown gas when heated in a dry test tube ? A. `LiNO_(3)` B. `KNO_(3)` C. `Pb(NO_(3))_(2)` D. `AgNO_(3)`
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