Solve below rebus puzzle?

Name a key which is hardest to turn.

Which five letter word can be added at the end of below word to form a
valid word?

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Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Can you solve the below tricky visual equation?