Chemistry

The work function of sodium metal is 4.41 * 10⁻¹⁹ J. If photons of wavelength 300 nm are incident on the metal, the kinetics energy of the ejected electrons will be (h = 6.63 * 10⁻³⁴ Js; c = 3 * 10⁸ m/s) * 10⁻²¹ J. [numerical value].

The heat of combustion of ethanol into carbon dioxides and water is –327kcal at constant pressure. The heat evolved (in cal) at constant volume at 27°C (if all gases behave ideally) is (R=2calmol⁻¹K⁻¹) [numerical value].

For the disproportionation reaction 2Cu⁺(aq) ⇌ Cu(s) + Cu²⁺ at 298 K, ln K (where K is the equilibrium constant) is * 10⁻¹.
Given: (E⁰(Cu²⁺/Cu⁺) = 0.16V, E⁰(Cu⁺/Cu) = 0.52V, RT/F = 0.025) [numerical value].

The ratio of the mass percentages of 'C&H' and 'C&O' of a saturated acyclic organic compound 'X' are 4:1 and 3:4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound 'X' is [numerical value].

The ratio of the mass percentages of 'C&H' and 'C&O' of a saturated acyclic organic compound 'X' are 4:1 and 3:4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound 'X' is [numerical value].

The molecular geometry of SF₆ is octahedral. What is the geometry of SF₄ (including lone pair(s) of electrons, if any)?

The size of a raw mango shrinks to a much smaller size when kept in a concentrated salt solution. Which one of the following process can explain this?

The one that is not expected to show isomerism is:

An organic compound 'A' (C?H?O) when treated with conc. HI undergoes cleavage to yield compound 'B' and 'C'. 'B' gives yellow precipitate with AgNO? where as 'C' tautomerizes to 'D'. 'D' gives positive iodoform test. 'A' could be:

Amongst the following statements regarding adsorption, those that are valid are:
(a) ΔH becomes less negative as adsorption proceeds.
(b) On a given adsorbent, ammonia is adsorbed more than nitrogen gas.
(c) On adsorption, the residual force acting along the surface of the adsorbent increases.
(d) With increase in temperature, the equilibrium concentration of adsorbate increases.