Chemistry

According to Both's atomic theory:

(A) Kinetic energy of electron is $\frac{z^2}{n^2}$  

(B) The product of velocity (v) of electron and principal quantum number (n) 'vn'  Z²

(C) Frequency of revolution of electron in an orbit is $\frac{Z^3}{n^3}$  

(D) Coulombic force of attraction on the electron is $\frac{z^3}{n^4}$  

Choose the most appropriate answer from the options given below:

The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is:

Given below are two statements:

Statement I : The value of the parameter “Biochemical Oxygen Demand (BOD)” is important for survival of aquatic life.

Statement II : The optimum value of BOD is 6.5 ppm.

In the light of the above statements, choose the most appropriate answer from the options given below:

The diazonium salt of which of the following compounds will form a coloured dye on reaction with β-Naphthol in NaOH?

What is the correct sequence of reagents used for converting nitrobenzene into m- dibromobenzene?

In polymer Buna – S : 'S' stands for:

Which one of the following carbonyl compound cannot be prepared by addition of water on an alkyne in the presence  of HgSO₂ and H₂SO₄?

The calculated magnetic moments (spin only value) for species ${\left[FeC{l}_4\right]}^{2-},{\left[Co{\left(C_2{O}_4\right)}_3\right]}^{3-}$ and   $Mn{O}_4^{2-}$

The correct set from the following in which both pairs are in correct order of melting point is:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere.

Reason R : Hydrogen is the lightest element

In the light of the above statements, choose the correct answer from the options given below: