____ is a colorless gas with a pungent smell that is recognized by most as a cleaning product for drains and as an oven cleaner at concentrations as low as three parts per million (ppm).

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Anhydrous ammonia is a colorless gas with a pungent smell that is commonly used as a cleaning product for drains and as an oven cleaner at low concentrations. Calcium oxide is a white powder used in various industrial processes but is not commonly recognized as a cleaning product or with a pungent smell. Silica is a mineral commonly used in construction materials, and hydrofluoric acid is a highly corrosive liquid used in industrial applications but is not commonly recognized as a cleaning product with a pungent smell.

____ Is a Colorless Gas with a Pungent Smell That