What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

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

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?