What is inert pair effect?

What is the formula of kernite, an ore of boron?

Explain the nature of boric acid as a Lewis acid in water?

Why does silicon show a higher covalency than carbon?

Why is diamond a bad conductor of electricity but a good conductor of heat?

Discuss the pattern of variation in the oxidation states of B to TI

What is the oxidation state of carbon in each of the following:
(i) CO₂ 
(ii) CaC₂  
(iii) H₂CO₃  
(iv) HCN  
(v) CO

Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicon?

Explain Silicon forms SiF₆^2- ion whereas corresponding chloro molecule is a resonance of carbon is not known.

Why does lime water turn milky when CO₂  is passed through it.

Explain the Aluminium alloys are used to make aircraft body.

Explain Silicon is heated with methyl chloride at high temperature in the presence of copper.

Explain CO is heated with ZnO

Identify the compounds A, X and Z in the following reactions,
\(Z+3LiAlH_{ 4 }\rightarrow X+3LiF+3AlF_{ 3 }\)
\( X+6{ H }_{ 2 }O\rightarrow Y+6{ H }_{ 2 }\)
\(X+3O_{ 2 }\underrightarrow { \Delta } B_{ 2 }O_{ 3 }+3{ H }_{ 2 }O\)

Elemental silicon does not form a graphite-like structure as carbon does.Given reason.

What happens when borax is heated strongly?

What happens when BF₃ is reacted with ammonia?

Classify the following oxides as neutral acidic, basic or amphotrric
CO, B₂O₃, Sio₂, CO_2, Al₂O₃, PbO₂, Tl₂O₃