Class 12th

The stepwise formation of ${{\left[Cu{\left(N{H}_3\right)}_4\right]}^2}^{+}$  is given below:

$C{u}^{2+}+N{H}_3\stackrel{k_1}{?}{\left[Cu\left(N{H}_3\right)\right]}^{2+}$            

${\left[Cu\left(N{H}_3\right)\right]}^{2+}+N{H}_3\stackrel{k_2}{?}{\left[Cu{\left(N{H}_3\right)}_2\right]}^{2+}$        

  ${\left[Cu{\left(N{H}_3\right)}_2\right]}^{2+}+N{H}_3\stackrel{k_3}{?}{\left[Cu{\left(N{H}_3\right)}_3\right]}^{2+}$          

${\left[Cu{\left(N{H}_3\right)}_3\right]}^{2+}+N{H}_3\stackrel{k_4}{?}{\left[Cu{\left(N{H}_3\right)}_4\right]}^{2+}$            

The value of stability constants k₁, k₂, k₃ and k₄ are  $10^4,1.58*10^3,5*10^{2}and10^2$ respectively.

The overall equilibrium constants for dissociation of   ${\left[Cu{\left(N{H}_3\right)}_4\right]}^{2+}isx*10^{-12}.$ The value of x is________ (Rounded off to the nearest integer)

In mildly alkaline medium, thiosulphate ion is oxidized by   $Mn{O}_4^{-}$ to “A”. The oxidation state of sulphur in 'A' is………….

The number of octahedral voids per lattice site in a lattice is………. (Rounded off to the nearest integer)

The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]

Number of amphoteric compounds among the following is___________.

Out of the following which type of interaction is responsible for the stabilization of a-helix structure of proteins?

Considering the above reaction, the major product among the following is:

In the following reaction the reason why meta-nitro product also formed is:

2,4-DNP test can be used to identify: