Answer:
strongest oxidizing agent: 
weakest oxidizing agent: 
strongest reducing agent: Y
weakest reducing agent: X
will oxidize Z
Explanation:
The higher the reduction potential of a species, higher will be the tendency to consume electrons from another species. Hence higher will be the oxidizing power of it's oxidized form and lower will be the reducing power of it's reduced form.
Alternatively, higher reduction potential value suggests that the oxidized form of the species acts as a stronger oxidizing agent and the reduced form of the species acts as a weaker reducing agent.
Order of reduction potential:

So, strongest oxidizing agent: 
weakest oxidizing agent: 
strongest reducing agent: Y
weakest reducing agent: X
As reduction potential of the half cell
is higher than the reduction potential of the half cell
therefore
will oxidize Z into
and itself gets converted into X.
Answer:
Option C
Explanation:
According to Hund's rule
- pairing of electrons occur first in lower energy orbitals then in orbitals having higher energy.
d subshell has 5 orbitals.
- so first these 5 get filled.
- The. one will be added to first one.
Answer:
The number of protons in an atom is always equal to the atomic number.
Explanation:
Pb (CO3)2 I’m assuming you just need to convert it to the formula.
Using the ideal gas law, for a constant temperature, pV = constant (also known as Boyle's Law)
(1 atm)(175 L) = (5.2 atm)(V) = constant
V = 33.7 L