P-block elements

The oxides of boron and silicon are _______in nature.

• basic

• acidic

• amphoteric

• both a & b

It is the strongest oxidising agent and most reactive element among the halogens.

• F

• Cl

• Br

• I

Borax is______

• Na₃[B₂O₅(OH)₃].7H₂O

• Na₂[B₄O₅(OH)₄].8H₂O

• Na₄[B₂O₆(OH)₂].5H₂O

• Na[B(OH)₂]

In groups 15 to 18, the poor shielding effect of d & f electrons are overcome by the increased shielding effect of the additional ________electrons.

• s

• p

• d

• f

Many of the Boron compounds are

• electron rich

• electron deficient

• electron donor

• none

Diborane is ______

• B₂H₈

• B₄H₁₀

• B₂H₃

• B₂H₆

Tl exists in +1 oxidation state rather than +3 due to

• low ionisation energy

• larger size

• inert pair effect

• Shielding effect

The chemical form of Borax is

• Sodium carbonate

• Sodium tetra borate

• Sodium tetraborate decahydrate

Which of the following metals has the largest abundance in the earth's crust?

• Al

• Ca

• Mg

• Na

Which of the following elements has a greater tendency to form chain of bonds with itself or with other atoms?

• B

• N

• C

• O