Class 12th

At 600K, 2 mol of NO are mixed with 1 mol of O₂.

2NO_(g) + O₂(g) $\rightleftarrows$  2NO₂(g)

The reaction occurring as above comes to equilibrium under a total pressure of 1 atm. Analysis of the system shows that 0.6 mol of oxygen are present at equilibrium. The equilibrium constant for the reaction is__________. (Nearest integer)

Let $\alpha$ and $\beta$ be roots of $x^2-3x+p=0$ and $\gamma$ and $\delta$ be the roots of $x^2-6x+q=0$ . If $\alpha ,\beta$ , $\gamma ,\delta$ , form a geometric progression. Then ratio $(2q+p):(2q-p)$ is:

A gaseous mixture of two substances A and B, under a total pressure of 0.8 atm is in equilibrium with an ideal solution. The mole fraction of substance A is 0.5 in the vapour phase and 0.2 in the liquid phase. The vapour pressure of pure liquid A is_________atm. (Nearest integer)

If the wavelength for an electron emitted from H-atom is 3.3 * 10^-10m, then energy adsorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is ___________times. (Nearest integer)

[Given: h = 6.626 * 10^-34 Js]

Mass of electron = 9.1 * 10^-31 kg

Metal M crystallizes into a fcc lattice with the edge length of 4.0 * 10^-8cm. The atomic mass of the metal is_________ g/mol. (Nearest integer)

(Use: N_A = 6.02 * 10²³mol^-1, density of metal, M = 9.03 g cm^-3).

2L of 0.2 M H₂SO₄ is reacted with 2L of 0.1 M NaOH solution, the molarity of the resulting product Na₂SO₄ in the solution is_________ millimolar (Nearest integer)

At $20.0\mathrm{m}\mathrm{L}$ solution containing $0.2\mathrm{g}$ impure ${\mathrm{H}}_2{\mathrm{O}}_2$ reacts completely with $0.316\mathrm{g}$ of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4$ in acid solution. The purity of ${\mathrm{H}}_2{\mathrm{O}}_2$ (in %) is (mol. wt. of ${\mathrm{H}}_2{\mathrm{O}}_2=34$ ; mol. wt. of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4=158$ ) 

The number of chiral centres present in $\left[\mathrm{B}\right]$ is

The mass of ammonia in grams produced when $2.8\mathrm{k}\mathrm{g}$ of dinitrogen quantitatively reacts with $1\mathrm{k}\mathrm{g}$ of dihydrogen is(Mole Concept)