Can someone’s answer theses 2 problems? there easy but i can’t get them, and : )

What overall charge must all compounds have

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

In the reaction between a crushed antacid tablet and vinegar what gas is emitted