Spot the error in the sentence one of the chairs are broken

I don't know the answer please help

What errors do you see?

I sing a song

Ramu went abroad
Remove the furniture from here
One of the boys is tall

One of tha chaurs have broken

Spot the error

I sings a song
Ramu went to abroad
Remove the furnitures from here
One of the boy is tall

I'm not going to give you the answers. These are common English errors. Everyone who studies English should be able to find them.

Study your text again.

Only one chair is broken.

"One" is the subject. "Of the chairs" is a prepositional phrase modifying "one."