Chemistry

Consider the cell at 25°C
Zn | Zn²?(aq), (1M) Fe³?(aq), Fe²?(aq) | Pt(s)
The fraction of total iron present as Fe³? ion at the cell potential of 1.500V is x * 10?². The value of x is ______ (Nearest integer).
(Given: E?(Fe³?/Fe²?) = 0.77V, E?(Zn²?/Zn) = -0.76V)

When 10 ml of an aqueous solution of Fe²? ions was titrated in the presence of dil H?SO? using diphenylamine indicator, 15 mL of 0.02 M solution of K?Cr?O? was required to get the end point. The molarity of the solution containing Fe²? ions is x * 10?²M. The value of x is ______. (Nearest integer)

CO? gas is bubbled through water during a soft drink manufacturing process at 298 K. If CO? exerts a partial pressure of 0.835 bar then x m mol of CO? would dissolve in 0.9 L of water. The value of x is ______ (Nearest integer). (Henry's law constant for CO? at 298 K is 1.67*10³ bar)

Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ______ * 10?¹g, (in nearest integer).

At 298 K, the enthalpy of fusion of a solid (X) is 2.8kJ mol?¹ and the enthalpy of vaporization of the liquid (X) is 98.2 kJ mol?¹. The enthalpy of sublimation of the substance (X) in kJ mol?¹ is ______ (in nearest integer).

The number of sigma bonds in 

Given below are two statements:
Statement I: None of the alkaline earth metal hydroxides dissolves in alkali.
Statement II: Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which one of the products of the following reactions does not react with Hingberg reagent to form sulphonamide?
[Four different reduction reactions of nitriles and nitro compounds]

Which one of the following chemical agent is not being used for dry-cleaning of clothes?

For water at 100°C and 1 bar, ΔᵥₐₚH - ΔᵥₐₚU = _______ * 10² J mol⁻¹ (Round off to the Nearest integer) [Use: R = 8.31 J mol⁻¹ K⁻¹] [Assume volume of H₂O(l) is much smaller than volume of H₂O(g). Assume H₂O(g) can be treated as an ideal gas]