Class 11th

A particle is released from height $S$  from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively:

Given below are two statements:

Statement I:
The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group.

Statement II:
o-nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring.

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

Given below are two statements:

Statement I:
The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group.

Statement II:
o-nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring.

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

Which of the following p – V curve represents maximum work done?

A small block slides down on a smooth inclined plane, starting from rest at time $t=0$ . Let $S_n$ be the distance travelled by the block in the interval $t=n-1$ to $t=n$ . Then, the ratio $\frac{S_n}{S_{n+1}}$  is:

Two transparent media A and B are separated by a plane boundary. The speed of light in those media are $1.5*{10}^8\mathrm{m}/\mathrm{s}$ and $2.0*{10}^8\mathrm{m}/\mathrm{s}$ , respectively. The critical angle for a ray of light for these two media is

Which amongst the following is incorrect statement?

Gadolinium has a low value of third ionisation enthalpy because of:

Which compound amongst the following is not an aromatic compound?

The escape velocity from the Earth's surface is $v$ . The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is: