It breaks into calcium oxide and carbon di oxide.
One major characteristic they have in common is they are metals.
So first we need to know what the formulas are:
Methane: 
Oxygen: 
Carbon Dioxide: 
Water: 
So then we follow the equation as specified in the question. Note that it does not need to be balanced, as the question states it wants the unbalanced equation:
→ 
This is the preliminary, unbalanced equation with the correct chemical formulas.
Answer:
a b c are correct and rest of other are incorrect
Answer:
Δ S° > 0
Explanation:
Entropy -
In a system, the randomness is measured by the term entropy .
Randomness basically refers as a form of energy that can not be used for any work.
The change in entropy is given by the change in heat per change in temperature.
- When solid is converted to gas entropy increases,
As the molecules in solid state are tightly packed and has more force of attraction between the molecules, but as it is converted to gas, the force of attraction between the molecule decreases and hence entropy increases.
So,
The particles of the substance , if are tightly held by strong force of attraction will decrease the entropy ,
And
If the particles are loosely held , the entropy will increase .
From the reaction given in the question ,
Cu₂O (s) + C (s) → 2 Cu (s) + CO (g)
Considering the states of the reactant and the product ..
The product formed i.e. CO is in gaseous species , hence , the entropy increases .
