Question

which type of compound is HI?​

Answer 1

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Yes the compound is covalent!

Here, Hydrogen is an electropositive substance (but it is a non metal) and the Iodine is an electronegative (non metal) element. So, the bond formed between an electropositive (non metal) and a non metal is always not ionic however it seems to be ionic.

The bond between HI is a polar covalent bond. It is because Hydrogen is electropositive in nature in comparison to Iodine. So, the bonding is covalent but it has partial polarity in charges.

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Answer 2

Hydrogen iodide....

in which hydrogen and iodine atom are combined