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

2

(a)

How does electron deficient compound BF₃ achieve electronic saturation , i.e fully ooccupied outer electron shells?

2

(a)

Give one chemical reaction to show that Tin(II) chloride is a reducing agent.

2

(a)

Give reasons.
Conc.HNO₃ can be transported in aluminium container.

2

(a)

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

2

(a)

How is excessive content of CO₂ responsible for global warming?

2

(a)

What do you understand by allotropy.

2

(a)

What do you understand by catenation.

2

(a)

Why do boron halides form addition compounds with NH₃?

2

(a)

What happens when NaBH₄ reacts with iodine?

2

(a)

CO₂ is gas while SiO₂ is solid at room temperature. Give reason.

2

(a)

What is producer gas?

2

(a)

Mention the state of hybridisation of B in BH₄^-.

2

(a)

Give reason for the tendency for catenation decrease down the group in Group 14.

2

(a)

Give reason for The decreasing stability of +3 oxidations state with increasing atomic number in group 13

2

(a)