Chemistry

The region in the electromagnetic spectrum where the Balmer series lines appear is:

The decreasing order of reactivity of the following organic molecules towards ${\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}}_3$ solution is:

Among statements (a) - (d), the correct ones are:

(a) Lime stone is decomposed to $\mathrm{C}\mathrm{a}\mathrm{O}$ during the extraction of iron from its oxides.

(b) In the extraction of silver, silver is extracted as an anionic complex.

(c) Nickel is purified by Mond's process.

(d) Zr and Ti are purified by Van Arkel method.

In the estimation of bromine, 0.5g of an organic compound gave 0.40g of silver bromide. The percentage of bromine in the given compound is____________% (Nearest integer)

(Relative atomic masses of Ag and Br are 18 u and 80 u, respectively).

Number of complexes which will exhibit synergic bonding amongst $\left[Cr{\left(CO\right)}_6\right],\left[Mn{\left(CO\right)}_5\right]$  and $\left[M{n}_2{\left(CO\right)}_{10}\right]$  is_______________.

For a first order reaction A→B, the rate constant, k = 5.5 * 10^-14s^-1. The time required for 67% completion of reaction is x * 10^-1 times the half life of reaction. The value of x is ________ (Nearest integer)

(Given : log 3 = 0.4771)

The quantity of electricity in Faraday needed to reduce 1 mol of $C{r}_2{O}_7^{2-}$  to Cr³⁺ is________.

The solubility product of a sparingly soluble salt A₂X₃ is 1.1 * 10^-23. If specific conductance of the solution is 3 * 10^-1, the limiting molar conductivity of the solution is x * 10^-3 S m² mol^-1. The value of x is_________.

The vapour pressure of two volatile liquid A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is $\frac{x}{17}.$  The value of x is____________.

4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 20L. The amount of heat absorbed in this expansion is _________L atm.