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The p-Block Elements
Question
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How will you prepare hyrogen iodide?

Answer

Hydrogen iodide can be prepared by reacting iodine with hydrazine.
2I2 + N2H4 →  N2 + 4HI

HI can be prepared by simply combining H2 and I2: 
H2 + I2 → 2 HI

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Some More Questions From The p-Block Elements Chapter

Mention the conditions required to maximise the yield of ammonia.

What is the covalency of nitrogen in N2O5?

Bond angle in PH4+ is higher than that in PH3. Why?

Write a balanced equation for the hydrolytic reactions PCl5 in heavy water.

What is the basicity of H3PO4?

What happens when H3PO3 is heated?

List the important source of sulphur.