The amount of Ammonium Chloride required for providing

To kill two birds with one stone 

Find the word with the appropriate similar meaning of the word in Italic from the options given:

The team worked on the project with zeal .

In the following question select the answer pair that expresses a relationship most similar to that expressed in the capitalised pair.

Blend

His speech was articulate and well-delivered.

Heart : Cardiology :: Insects : ?

Deadlock 

Select the most appropriate synonym of the given word.

Diligent

Puerile

Select the wrongly spelt word.