Chemistry

The oxidation number of phosphorus in ATP (adenosine triphosphate) is :

Certain fixed quantity of an ideal gas expands by adiabatic manner such that w_gas is equal to -25 kJ and ∆H_gas for the expansion is -75kJ. The ratio of C_p/C_v for this gas will be equal to:

For the first order reaction A → 2B, 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is _____ min. (Round off to the Nearest Integer).
[Use : ln2 = 0.69, ln 10 = 2.3 Properties of logarithms : ln x? = y ln x; ln(x/y) = lnx – lny ]

Given that ∆c H° (combustion enthalpy) for Diamond is -834.8 kJ mole and ∆c H° for graphite is -832.8 kJ/mole, the value of ∆f H°(Diamond) i.e. [C(graphite) → C(diamond)] [in kJ/mole] is:

At critical condition of temperature and pressure for a real gas, what would be the value of 16 Z? Here, Z is its compressibility factor.

10.30 mg of O₂ is dissolved in 1L of sea water of density 1.03 g/mL. The concentration of O₂ in ppm is _______.

In a solvent 50% of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____ *10⁻². (Round off to the Nearest Integer).

Percentage packing fraction of diamond is x (approximately), and the number of particle per unit cell is y. Then the value of x + y is

Number of Cl=O bonds in chlorous acid, chloric acid and perchloric acid respectively are:

0.25 M solution of pyridinium chloride C₅H₆N⁺Cl⁻ was found to have a pH of 2.699. if the value of Kₑ of pyridine C₅H₅N is a * 10⁻¹⁰, then the value of a is (given, 10⁻².⁶⁹⁹ = 2 * 10⁻³)