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Home └📚 "12वीं कक्षा का मेगा क्विज़ - अपना ज्ञान परखें!" 🎯 └Chemistry Board Exam 2025: 12th Science छात्रों के लिए Free Test Series

📚 "12वीं कक्षा का मेगा क्विज़ - अपना ज्ञान परखें!" 🎯

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Chemistry Board Exam 2025: 12th Science छात्रों के लिए Free Test Series

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1. which of the following types of crystal is diamond ?
Ionic crystal Covalent crystal Molecular crystal Metallic crystal
2. the structure of NaCL crystal is
Hexagonal close packing Face centred cubic square planar Body centred cubic
3. Which of the following is an amorphous solid ?
Diamond Graphite Common salt Glass
4. An octahedral void is surrounded by how many spheres ?
6 4 8 12
5. The total number of crystal systems is
7 8 6 4
6. Which of the following is a covalent solid?
Iron Diamond Sodium chloride Copper
7. The coordination number of a metal crystallizing in a hexagonal close packed structure is
5 4 8 12
8. what is the co-ordination number of sodium in sodium oxide(Na2O)?
6 4 8 2
9. The co-ordination number of a metal crystallizing in hexagonal close packed structure is-
12 8 4 6
10. what is the co-ordination number in a square close packed structure in two dimensions?
2 3 4 6
11. In hcp unit cell, number of atoms is
4 6 12 7
12. The lattice site in a pure crystal cannot be occupied by
molecule ion electron atom
13. let the number of close packed spheres be N, then the number of tetrahedral voids generated is
N 2N N/2 3N
14. In a closed packed array of N-spheres, the number of octahedral holes are
N/2 2N N 4N
15. In which of the following pairs of structure are tetrahedral as well as octahedral voids respectively?
bcc and fcc hcp and simple cubic hcp and ccp bcc and hcp
16. Amorphous solid can also be called
pseudo solids super cooled liquids non-crystalline all of these
17. Graphite cannot be classified as
conducting solid network solid covalent solid ionic solid
18. Quartz is
crystalline solid amorphous solid pseudo solid super cooled liquid
19. which of the following is a crystalline solid?
diamond glass rubber all of these
20. which of the following condition favour the existence of a substance in the solid state?
high temperature low temperature high thermal energy weak cohesive forces