JEE MAIN 2022 ONLINE 27TH JUNE EVENING SHIFT

For a transistor to act as a switch, it must be operated in

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is :

Let \(S = 2 + {6 \over 7} + {{12} \over {{7^2}}} + {{20} \over {{7^3}}} + {{30} \over {{7^4}}} + \,.....\). Then 4S is equal to

We do not transmit low frequency signal to long distances because-

(a) The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength.

(b) Effective power radiated by a long wavelength baseband signal would be high.

(c) We want to avoid mixing up signals transmitted by different transmitter simultaneously.

(d) Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well.

Therefore, the most suitable option will be :

Statement I : Leaching of gold with cyanide ion in absence of air / O₂ leads to cyano complex of Au(III).

Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction.

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

Let A and B be two 3 \(\times\) 3 matrices such that \(AB = I\) and \(|A| = {1 \over 8}\). Then \(|adj\,(B\,adj(2A))|\) is equal to