<u>Answer:</u> The thickness of metal sheet is 1.93 mm
<u>Explanation:</u>
The metals sheet is in the form of cuboid.
To calculate the width of the metal sheet for the given volume, we use the equation to calculate the volume of cuboid, which is:

where,
V = volume of metal sheet =
l = length of metal sheet = 15.9 cm
b = width of metal sheet = 14.8 cm
h = height of metal sheet = ? cm
Putting values in above equation, we get:

Converting this thickness into millimeters, we use the conversion factor:
1 cm = 10 mm
So, 
Hence, the thickness of metal sheet is 1.93 mm
From the chemical equation given:
H2SO4+2KOH--->K2SO4+2H2O
the two reactants, H2SO4 and KOH, are in 1:2 stoichiometric ratio.
No. of moles of KOH = 2* no. of moles of H2SO4
=2*0.1*0.033
The concentration of KOH = no. of moles / volume
=2*0.1*0.033/0.05
=0.132M
Aluminium nitrate is acidic as its made by a weak base with a relatively stronger acid.
Hope that helps ;)