Questions

Farsightedness is more properly called Hyperopia.

The fall of the Czar is known as February Revolution because, according to the old Russian calender, it occured on 27 February 1917.

In general, polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.
As water molecules are polar, polar molecules dissolves in water.

For neutral atoms, the periodic trends in atomic size can be described like this

Atomic size decreases when going from left to right across a period,
Atomic size increases when going from top to bottom down a group.

Let's use these trends to try and figure out which atom would have the largest radius.

If you look at elements that are located in the same group, potassium will have a larger atomic radius when compared with sodium. Likewise, bromine will have a larger atomic radius when compared with chlorine.

Now focus on potassium and bromine. Since potassium is located at the start of period 3, and bromine at the end of the same period, potassium will have a larger atomic radius than bromine, and thus the largest atomic radius of the four given atoms.

Alluvial type of soil has the largest area covered in India. Alluvial soils are fine-grained fertile soil deposited by water flowing over flood plains or in river beds. Most of the soil is Sandy and clayey soils are not uncommon.

When you can't hear it is called as Deaf.