Riddles 9

Riddle – 1: What is something that cannot be beaten and is always one step ahead, and without, one could not be beaten or ever be dead? Riddle – 2: If it’s information you seek, come and see me. If its pairs of letters you need, I have consecutively three. Hint – 1: Who might keep information Read more about Riddles 9[…]

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Oxides of nitrogen

Oxides of nitrogen range from N2O (oxidation state of nitrogen +1) through NO, N2O3, NO2, N2O4, N2O5 in which the oxidation state of nitrogen is +5 1. NO2– Nitrogen dioxide: ⇒ NO2 is an intermediate in the industrial synthesis of nitric acid. ⇒ This reddish – brown toxic gas has a characteristic sharp, biting odor and is a prominent air pollutant. It absorbs light and leads to the yellow-brown Read more about Oxides of nitrogen[…]