Q.1. The chemical formula of silica is:
(A) SiO
(B) SiO₂
(C) Si₂O₃
(D) SiO₃
Q.2. Which of the following is a crystalline form of silica?
(A) Glass
(B) Quartz
(C) Silica gel
(D) Kieselguhr
Q.3. Which of the following is NOT a crystalline form of silica?
(A) Quartz
(B) Cristobalite
(C) Tridymite
(D) Silica gel
Q.4. The structure of silica is:
(A) Linear
(B) Planar
(C) Three-dimensional network
(D) Simple cubic
Q.5. In silica, each silicon atom is bonded to how many oxygen atoms?
(A) Two
(B) Three
(C) Four
(D) Six
Q.6. The geometry around silicon in silica is:
(A) Octahedral
(B) Tetrahedral
(C) Trigonal planar
(D) Linear
Q.7. Silica is almost non-reactive under normal conditions due to:
(A) Weak Si–O bond
(B) High Si–O bond enthalpy
(C) Low melting point
(D) Ionic bonding
Q.8. Which of the following is used as a piezoelectric material?
(A) Quartz
(B) Silica gel
(C) Cement
(D) Glass
Q.9. Silica gel is commonly used as:
(A) Fertiliser
(B) Drying agent
(C) Fuel
(D) Catalyst support only
Q.10. Kieselguhr is used in:
(A) Filtration plants
(B) Water softening
(C) Manufacture of gasoline
(D) Electrical wiring
Q.11. Kieselguhr is an amorphous form of:
(A) Aluminium oxide
(B) Silicon dioxide
(C) Calcium carbonate
(D) Magnesium oxide
Q.12. Silicones are:
(A) Inorganic salts
(B) Organosilicon polymers
(C) Simple oxides
(D) Ionic compounds
Q.13. The repeating unit of silicones is:
(A) –SiO₂–
(B) –(R₂SiO)–
(C) –(SiO₄)⁴⁻
(D) –(RSiO₃)–
Q.14. Which element is present in the backbone of silicones?
(A) Carbon
(B) Nitrogen
(C) Silicon
(D) Sulphur
Q.15. Which of the following is NOT a common use of silicones?
(A) Sealants
(B) Electrical insulators
(C) Waterproofing fabrics
(D) Manufacture of ordinary table salt
Q.16. Silicones are used as:
(A) Greases
(B) Sealants
(C) Electrical insulators
(D) All of these
Q.17. Silicones are used for waterproofing because they are:
(A) Highly soluble in water
(B) Water-repellent
(C) Strongly acidic
(D) Highly reactive with water
Q.18. The basic structural unit of silicates is:
(A) SiO₂
(B) SiO₃²⁻
(C) SiO₄⁴⁻
(D) Si₂O₇⁶⁻
Q.19. The geometry of the silicate unit SiO₄⁴⁻ is:
(A) Square planar
(B) Tetrahedral
(C) Octahedral
(D) Trigonal planar
Q.20. In the silicate tetrahedron, the central atom is:
(A) Aluminium
(B) Oxygen
(C) Silicon
(D) Carbon
Q.21. Which of the following is a natural silicate mineral?
(A) Feldspar
(B) Quartz
(C) Silica gel
(D) Kieselguhr
Q.22. Which of the following is an example of a man-made silicate?
(A) Mica
(B) Feldspar
(C) Glass
(D) Asbestos
Q.23. Which pair represents man-made silicates?
(A) Mica and feldspar
(B) Glass and cement
(C) Quartz and tridymite
(D) Zeolite and asbestos
Q.24. Zeolites are:
(A) Pure silicon oxides
(B) Microporous hydrated aluminosilicates
(C) Simple carbon compounds
(D) Metallic silicides
Q.25. Zeolites contain which two elements in their framework apart from oxygen?
(A) Silicon and aluminium
(B) Carbon and hydrogen
(C) Sodium and potassium only
(D) Calcium and magnesium only
Q.26. In the structure of zeolites, some silicon atoms are replaced by:
(A) Carbon atoms
(B) Aluminium atoms
(C) Sulphur atoms
(D) Phosphorus atoms
Q.27. The structure of zeolites is:
(A) One-dimensional
(B) Two-dimensional
(C) Three-dimensional framework
(D) Linear chain
Q.28. Which zeolite is used to convert alcohols directly into gasoline?
(A) ZSM-5
(B) Quartz
(C) Mica
(D) Feldspar
Q.29. Hydrated zeolites are used for:
(A) Hardening of water
(B) Softening of hard water
(C) Increasing water acidity
(D) Removing dissolved oxygen
Q.30. The softening of hard water by zeolites takes place through:
(A) Oxidation
(B) Reduction
(C) Ion exchange
(D) Polymerisation
Answer Key – All 30 MCQs
| Q. No. | Answer |
|---|---|
| 1 | (B) SiO₂ |
| 2 | (B) Quartz |
| 3 | (D) Silica gel |
| 4 | (C) Three-dimensional network |
| 5 | (C) Four |
| 6 | (B) Tetrahedral |
| 7 | (B) High Si–O bond enthalpy |
| 8 | (A) Quartz |
| 9 | (B) Drying agent |
| 10 | (A) Filtration plants |
| 11 | (B) Silicon dioxide |
| 12 | (B) Organosilicon polymers |
| 13 | (B) –(R₂SiO)– |
| 14 | (C) Silicon |
| 15 | (D) Manufacture of ordinary table salt |
| 16 | (D) All of these |
| 17 | (B) Water-repellent |
| 18 | (C) SiO₄⁴⁻ |
| 19 | (B) Tetrahedral |
| 20 | (C) Silicon |
| 21 | (A) Feldspar |
| 22 | (C) Glass |
| 23 | (B) Glass and cement |
| 24 | (B) Microporous hydrated aluminosilicates |
| 25 | (A) Silicon and aluminium |
| 26 | (B) Aluminium atoms |
| 27 | (C) Three-dimensional framework |
| 28 | (A) ZSM-5 |
| 29 | (B) Softening of hard water |
| 30 | (C) Ion exchange |
