Granite is stronger, and it doesn't grow mold in the rain. It also looks better than marble and is easier to carve.
The test for this is fairly simple.
We take a glowing match or splint near the gas sample, if the glow intensifies, oxygen is present.
If a lit splint or match goes out with a popping sound, this means that hydrogen is present.
A homogeneous mixture, the substances are uniformly distributed throughout the mixture
The answer would be MgO, as you spilt the two.
