Spot what is wrong here in below Picture?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

What does this Rebus Picture mean?

Name a key which is hardest to turn.

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

I cannot talk, but I always reply when spoken to. What am I?

A man dies of old age on his 25 birthday. How is this possible?