In the four images below, can you find the odd one out?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

I look at you, you look at me I raise my right, you raise your left. What am I?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)