Carbon and its Compounds — Science STD 10 — Question

What is meant by ‘heteroatom’? Give examples. Write the names and formulae of two organic compounds containing different heteroatoms.

What are amphoteric oxides? Give two examples of amphoteric oxides.

State two important uses of bleaching powder.

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configurations of these two elements. Which of these will be more electronegative? Why?

What is the nature of the oxide SO? What happens when it is dissolved in water ? Write the chemical equation of the reaction involved.

When the concentrated aqueous solution of substance X is electrolysed, then NaOH, Cl₂ and H₂ are produced. Name the substance X. What is the special name of this process?

Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?

Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?

Explain how coal was formed in the earth.

Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.