In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?

Related Mcqs:

1. Silicon differ from silica by a group of__________________?

   A. Ch3
   B. OH
   C. OCH3
   D. O2

2. When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called_________________?

   A. ABAB (hexagonal)
   B. ABCABC (Cubic)
   C. Orthor hombic
   D. Rhombohedral

3. Halides in which halogen atoms act as a bridge between two atoms of the other element are called___________________?

   A. Covalent halides
   B. Electronegative halides
   C. Polymeric halides
   D. Polymeric hydrides

4. Compound containing two halogen atoms on two adjacent carbon atoms are called as ___________?

   A. Glycols
   B. Vicinal dihalides
   C. Geminal dihalides
   D. Diols

   Submitted by: Aamir khan Hullio

5. CO2 is gas while SiO2 is solid at room temperature?

   A. carbon is non-metal while silicon is semi-metal
   B. CO2 is an independent molecule while SiO2 has network covalent structure
   C. CO2 forms multiple bond while silicon does not form multiple bonds
   D. Silicon has all sigma bonds

6. Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________?

   A. acetylene
   B. N-hexane
   C. Benzene sulphonic acid
   D. Sodium benzoate

7. Which of the following is not a use of silicon ?

   A. Lubricants
   B. Hydraulic brakes
   C. Antifreeze
   D. Water repellent

8. Silica gel and alumina are used as __________________?

   A. Mobile phase
   B. Stationary phase
   C. Mixed phase
   D. Single phase

9. Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________?

   A. More strength of H-bonding
   B. More strength of London forces
   C. Less polarizability
   D. All of the above

10. The atoms of same element having same atomic number but different mass number are called____________________?

    A. Isobars
    B. Isomers
    C. Isotopes
    D. Isotropes