Which of the following can not evolve more than one gas (vapour) if heated in dry test tube.

Which of the following can not evolve more than one gas (vapour) if heated in dry test tube.
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Which of the following can not evolve more than one gas (vapour) if heated in dry test tube. A. `naNO_(3)(s)` B. ... D. `(NH_(4))_(2)Cr_(2)O_(7)(s)`
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