Solution:

Discovered or not, it's always biggest ocean in the world.

Solution:

The farmer will be able to sell 0 oranges because the tree gives mango, not oranges.

Solution:

Initially, there are only two apples on the tree. I got one apple using the slingshot and therefore now one apple is on a tree and one with me.

Note: We got one apple(not apples).

Solution:

Mitch and Irene are the names of hurricane occurred in 2011 and 1998 respectively.

Solution:

They are not playing against each other.

Solution:

No layer will go on 'the fifth layer' because the fifth layer is the last layer.

Solution:

6 members.
Let's say 'C' is for crew and 'M' is Michael.

So their formation at that time is like:

C
C
C
M - 4th from back and front.
C
C
C

Solution:

Albumen is white of an egg (many of you have must have guessed yolk, which is yellow).

Solution:

It's a clever trick teaser.
We should note that Christmas occurs after 51 weeks and 2 days as in a calendar year new year comes before Christmas.

Solution:

The timer of a microwave.

The timer of a microwave generally consists of 4 digits. First two digit for minutes and next two for seconds.
So,
99 indicates - 1 minute 39 seconds
100 indicates - 1 minutes (1:00)