Answer:
Gneiss forms by regional metamorphism from both high temperature and pressure. Quartzite and marble are the most commonly used metamorphic rocks.
Answer:
0.156 moles of Fe₂O₃
Explanation:
To determine the moles, we must divide mass (g) to the molar mass of the compound.
Fe₂O₃ → 159.7 g/mol (molar mass)
We need the mass of compound in g, so let's do the conversion:
2500 cg . 1g / 100cg = 25 g
Moles = mass / molar mass → 25 g / 159.7 g/mol = 0.156 moles of Fe₂O₃
The correct answer is option B, that is, CO + H2O → H2 + CO2
The redox reactions are regarded as the chemical reactions in which one reactant goes through the process of reduction and one reactant goes through the process of oxidation. The reduction reactions are the reactions in which gain of electrons occurs, while oxidation reactions are the reactions in which loss of electrons occurs.
From the mentioned options, only option B, that is, CO + H2O → H2 + CO2 is a kind of redox reaction. In this, the carbon is getting oxidized from +2 to +4 oxidation state, and hydrogen is getting reduced from +1 to 0 oxidation state. Hence, this reaction can be regarded as a redox reaction.