NTA JEE Main 10th April 2015 Online

A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration was removed. The dried sample weighed 52 g. The formula of the hydrated salt is: (atomic mass, Ba = 137 amu, Cl = 35.5 amu)

If the principal quantum number n = 6, the correct sequence of filling of electrons will be:

In the long form of the periodic table, the valence shell electronic configuration of $$5s^25p^4$$ corresponds to the element present in:

The shape of $$XeOF_4$$ by VSEPR theory is:

After understanding the assertion and reason, choose the correct option.
Assertion: In the bonding molecular orbital (MO) of $$H_2$$, electron density is increased between the nuclei.
Reason: The bonding MO is $$\psi_A + \psi_B$$, which shows destructive interference of the combining electron waves.

Which of the following is not an assumption of the kinetic theory of gases?

The heat of atomization of methane and ethane are 360 kJ mol$$^{-1}$$ and 620 kJ mol$$^{-1}$$, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro's number = $$6.023 \times 10^{23}$$, h = $$6.62 \times 10^{-34}$$ J s)

Gaseous $$N_2O_4$$ dissociates into gaseous $$NO_2$$ according to the reaction $$N_2O_4(g) \rightleftharpoons 2NO_2(g)$$. At 300 K and 1 atm pressure, the degree of dissociation of $$N_2O_4$$ is 0.2. If one mole of $$N_2O_4$$ gas is contained in a vessel, then the density of the equilibrium mixture is:

Permanent hardness in water cannot be cured by:

The correct order of thermal stability of hydroxides is