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The p-Block Elements
Question
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NO2 is coloured but its dimer N2O4 is colourless. Why?

Answer

NO2 has unpaired electron and due to this it has brown colour. Whereas N2O4 has no unpaired electro thus it is colorless.

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Some More Questions From The p-Block Elements Chapter

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.

Write the order of thermal stability of the hydrides of Group 16 elements.

Why is H2O a liquid and H2S a gas?

Which of the following does not react with oxygen directly?
Zn, Ti, Pt, Fe