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

Can you move 2 matchsticks to form four equal sized squares.

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

What brings you down but never up?

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

What can you catch but never throw?

What Deficiency does the below rebus represent?

VIT_MIN

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?