121.

Name the type of the structure of silicate in which one oxygen atom of [SiO₄]^4- is shared?

• Sheet silicate

• Pyrosilicate

• Three dimensional silicate

• Linear chain silicate

The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJ mol^-1) of C-C, Si-Si and Ge-Ge bonds, respectively are

• 348, 167, 180

• 348, 180, 167

• 167, 180, 348

• 180, 167, 348

Number of oxygen atoms shared per Si${\mathrm{O}}_4^{4-}$ tetrahedron in

I. two dimensional sheet structured silicates

II. cyclic silicates and

III. single strand chain silicates respectively are

• 3, 3, 2

• 3, 2, 2

• 4, 3, 1

• 4, 3, 2

Red lead is

• PbO

• PbO₂

• Pb₃O₄

• Pb₂O₃

Which will liberate bromine from a solution of potassium bromide?

• I₂

• Cl₂

• SO₂

• HI

SiO₂ is reacted with sodium carbonate. What is the gas liberated ?

• CO

• O₂

• CO₂

• O₃

Pure silicon doped with phosphorus is a 

• metallic conductor

• insulator

• n-type semiconductor

• p-type semiconductor

Dry ice is

• solid CO₂

• solid camphor

• solid SO₂

• solid NO₂

Which of the following is the electron deficient molecule?

• PH₃

• SiH₄

• ${\mathrm{C}}_2{\mathrm{H}}_6$

• ${\mathrm{B}}_2{\mathrm{H}}_6$

Which of the following compounds is carbondum?

• Al₂O₃

• SiO₂

• SiC

• SnO₂