Mention the necessary candidates for the formation of an echo.

Mention two necessary conditions for doping.

Mention the factors that account for the formation of major biomes in the earth.

With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Mention the range of time scales.

What are necessary conditions required for combustion ?

In an election, the number of candidates is one greater than the persons to be elected. If a voter can vote in 254 ways, the number of candidates is

The formation of O_(2)""^(+)[PtF_(6)]^(-) is the basis for the formation of xenon fluorides. This is because