Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

Optical Illusion: People with hawk eyes can spot a different car in 5 seconds. Can you? Test your vision now!

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Can you identify the famous TV character from the rebus below?

Can you count the number of squares in the figure below?

How many triangles can you find in this given picture?

If 1+9+8=1, what is 2+8+9?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.