Chemistry

On complete reaction of FeCl3 with oxalic acid in aqueous solution containing KOH, resulted in the formation of product A. The secondary valency of Fe in the product A is ______.

A KCl solution of conductivity 0.14 Sm⁻¹ shows a resistance of 4.19 Ω in a conductivity cell. If the same cell is filled with an HCl solution, the resistance drops to 1.03 Ω. The conductivity of the HCl solution is ______ *10⁻²S m⁻¹.

Consider the above reaction. The percentage yield of amide product is ______.
Benzoyl chloride (0.140 g) + Diphenylamine (0.388 g) → N,N-Diphenylbenzamide (0.210 g)
(Round off to the nearest integer).
(Given: Atomic mass: C: 12.0 u, H:1.0 u, N: 14.0 u, O: 16.0 u, Cl: 35.5 u)

In the ground state of atomic Fe(Z = 26), the spin- only magnetic moment is ___*10?¹ BM.
(Round off to the nearest integer).
[Given √3 = 1.73, √2 = 1.41]

The reaction 2A + B₂ → 2AB is an elementary reaction.
For a certain quantity of reactants, if the volume of the reaction vessel is reduced by a factor of 3, the rate of reaction increases by a factor of ______.

The standard enthalpies of formation of Al₂O₃ and CaO are –1675 kJ mol⁻¹ and -635 kJ mol⁻¹ respectively.
For the reaction 3CaO + 2Al → 3Ca + Al₂O₃ the standard reaction enthalpy ΔᵣH° = _______ kJ.
(Round off to the nearest integer).

In the above reaction, 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is _______ % (Round off to the nearest integer).
(Given atomic mass : C: 12.0u, H:1.0u, O:16.0u, N:14.0u)

The mole fraction of a solute in a 100 molal aqueous solution is _______ *10^-2. (Round off to the nearest integer).
[Given : Atomic masses : H : 1.0u, O : 16.0u]

A certain orbital has n= 4 and m? = -3. The number of radial nodes in this orbital is _______ (Round off to the nearest integer).

15 mL of aqueous solution of Fe²⁺ in acidic medium completely reacted with 20 ml of 0.03 M aqueous Cr₂O₇^2-. The molarity of the Fe²⁺ solution is _______ *10^-2 M (Round off to the nearest integer).