For the following questions answer them individually
If the radius of the first orbit of hydrogen atom is $$a_0$$, then de Broglie's wavelength of electron in 3$$^{rd}$$ orbit is
Which one of the following elements will remain as liquid inside pure boiling water?
Group-13 elements react with O$$_2$$ in amorphous form to form oxides of type M$$_2$$O$$_3$$ (M = element). Which among the following is the most basic oxide?
During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.
The volume of 0.02 M aqueous HBr required to neutralize 10.0 mL of 0.01 M aqueous Ba(OH)$$_2$$ is (Assume complete neutralization)
Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
Structures of BeCl$$_2$$ in solid state, vapour phase and at very high temperature respectively are:
From the figure of column chromatography given below, identify incorrect statements.

A. Compound 'c' is more polar than 'a' and 'b'
B. Compound 'a' is least polar
C. Compound 'b' comes out of the column before 'c' and after 'a'
D. Compound 'a' spends more time in the column
Choose the correct answer from the options given below
The strongest acid from the following is
The group of chemicals used as pesticide is