Class 12th

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

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

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

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

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

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)

The intermediate X, in the reaction

The major product in the reaction

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

Consider a p-n junction diode which has a potential drop of 0.5 V which is to be taken independent of current (under forward bias). If we want to use 1.5 V cell to forward bias the diode then what should be the value of resister (in Ω) used in series with the diode so that current may not exceed 10 mA, and hence may work safely.

The IUPAC name of ethylidene chloride is:

In the colour coding system of carbon resistors, the tolerance (in %) shown by gold band is ____.

A radioactive sample decays with a constant of (1/3)logₑ2 s⁻¹. If initially there are 200 nuclei present, find the number of nuclei decayed during the first 9 seconds.

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

Two fixed long parallel horizontal rails, a distance 1 m apart are joined at one end by a resistance 1Ω . A rod AB of negligible resistance slides towards the resistance. A magnetic field of magnitude 4T perpendicular to the plane of rails exists. Find the current flowing (in Ampere) in the resistance, at an instant when the velocity of the rod is 2 m/s.