How is dinitrogen (1) oxide distinguished shed from oxygen​

To distinguish between nitrous oxide and oxygen. Ignite the candle and lower it to the bottom of the test tube into the N2O(g). It will burn much longer than in air and will burn with an enlarged flame. Repeat the candle experiment with O2(g) you will observe dazzling combustion of a candle in the presence of oxygen.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.