Questions

The Aufbau Principle states that in the ground state of an atom, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies.

In the above given sentences, there are some english grammatical and spelling mistakes. They are ::

1. He are very happy -------> He is very happy

2. We gonna get a new dog ------> We are going to get a new dog

3. It taste sweet  -------> It tastes sweet

4. He like cats -------> He likes cats

5. Me favourite coler is blue -------> My favourite color is blue

We know that polar substances are soluble in polar solvents and non polar substances are soluble in non-polar solvents only. Here the hydrocarbons are non-polar molecular substances and water is a polar solvent. So water can't dissolve hydrocabons.

Hence, as hydrocarbons are non-polar substances, they are insoluble in water as it is a highly polar solvent. 

Plants that grow in Saline Water are called Halophytes.

A Light-year is a distance that light travels in the vacuum in one Julian year (365.25 days).

The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometers or 5.9 trillion miles.