They elected him chairman. its passive form is:
He was elected chariman (by them)
Chairman was elected by them
Chairman was elected him by them
By them was he elected chairman
Explanation:
Correct Answer is: He was elected chariman (by them)

He was elected chariman (by them)
Chairman was elected by them
Chairman was elected him by them
By them was he elected chairman
Correct Answer is: He was elected chariman (by them)

I water the plants. The word `water` is used as- Option A: verb , Option B: adverb , Option C: Noun, Option D: Pronoun, correct answer is: verb
Identify the word that can be used as both singular and plural: Option A: wood , Option B: issue , Option C: fish, Option D: light, correct answer is: fish
`He pocketed the money.` In the sentence, the word `pocketed` has been used as a/an . Option A: Noun , Option B: Verb , Option C: adverb, Option D: Preposition, correct answer is: Verb
I have told you twice. Here `Twice` is- Option A: Adverb , Option B: Adjective , Option C: Noun, Option D: Preposition, correct answer is: Adverb
There has been a breakthrough in the treatment of dengue patients. Here `breakthrough` is a/an- Option A: adjective , Option B: verb , Option C: noun, Option D: adverb, correct answer is: noun