AP EAPCET 25-Aug-2021 Shift 2 Paper

When zinc reacts with dilute HNO3, it will produce nitrous oxide gas. At room temperature, it is a colourless, non-flammable gas, with a pleasant, slightly sweet odor.

Similarly, when zinc reacts with concentrated HNO3, it will produce nitrogen dioxide gas (NO2). It is used as the indicator for the larger group of nitrogen oxides.