Answer:
is formed and it has three unpaired electrons.
Explanation:
Blue 
reacts with water to produce pink colored complex.
In this complex, 
ion forms an octahedral complex with six 
ligands.
As is a weak field ligand therefore ion remains in low spin state.
Hence electronic configuration of ion in this octahedral geometry is 
with total three unpaired electrons.
Answer:
0.500 mol/dm³
Explanation:
Using the formula below;
CaVa = CbVb
Where;
Ca = concentration of acid (mol/dm³)
Cb = concentration of base (mol/dm³)
Va = volume of acid (cm³)
Vb = volume of base (cm³)
In accordance to the information provided in this question is;
Va = 5cm³
Vb = 250 cm³
Ca = 12 mol/dm³
Cb = ?
Using CaVa = CbVb
12 × 5 = Cb × 250
60 = 120Cb
Cb = 60/120
Cb = 0.500 mol/dm³
You have to balance out those forces and apply the same amount of equal and opposite force to it. I hope I helped ^^
The answer is A, because of the chemical reaction taking place color can change (as in this case). Hope it helps!
