NTA JEE Main 12th April 2014 Online

The amount of BaSO$$_4$$ formed upon mixing 100 mL of 20.8% BaCl$$_2$$ solution with 50 mL of 9.8% H$$_2$$SO$$_4$$ solution will be: (Ba = 137, Cl = 35.5, S = 32, H = 1 and O = 16)

If $$m$$ and $$e$$ are the mass and charge of the revolving electron in the orbit of radius $$r$$ for hydrogen atom, the total energy of the revolving electron will be:

The de-Broglie wavelength of a particle of mass 6.63 g moving with a velocity of 100 ms$$^{-1}$$ is:

Excited hydrogen atom emits light in the ultraviolet region at $$2.47 \times 10^{15}$$ Hz. With this frequency, the energy of a single photon is: (h = $$6.63 \times 10^{-34}$$ Js)

Similarity in chemical properties of the atoms of elements in a group of the Periodic table is most closely related to:

Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species O$$^{2-}$$, S$$^{2-}$$, N$$^{3-}$$, P$$^{3-}$$?

Which of the following molecules has two sigma ($$\sigma$$) and two pi ($$\pi$$) bonds?

The (S°) of the following substances are: CH$$_4$$(g) 186.2 JK$$^{-1}$$ mol$$^{-1}$$, O$$_2$$(g) 205.2 JK$$^{-1}$$ mol$$^{-1}$$, CO$$_2$$(g) 213.6 JK$$^{-1}$$ mol$$^{-1}$$, H$$_2$$O(g) 69.9 JK$$^{-1}$$ mol$$^{-1}$$. The entropy change ($$\Delta S^\circ$$) for the reaction CH$$_4$$(g) + 2O$$_2$$(g) → CO$$_2$$(g) + 2H$$_2$$O(l) is:

The standard enthalpy of formation ($$\Delta_fH^\circ_{298}$$) for methane, CH$$_4$$ is $$-74.9$$ kJ mol$$^{-1}$$. In order to calculate the average energy given out in the formation of a C-H bond from this it is necessary to know which one of the following?

What happens when an inert gas is added to an equilibrium keeping volume unchanged?