General
✓✗In which type of silicate structure is only one oxygen atom of each SiO44− tetrahedron shared?
- Pyrosilicate
- Three-dimensional silicate
- Linear chain silicate
- Sheet silicate
General
✓✗Which of the following compounds is electron-deficient?
- PCl5
- SiCl4
- BCl3
- CCl4
General
✓✗Which of the following elements belongs to group 13?
- Germanium
- Gallium
- Silicon
- Arsenic
General
✓✗Match List I (element) with List II (nature).
Choose the correct answer from the options given below.
| List I | List II |
| P. Carbon | I. Metal |
| Q. Silicon | II. Typical non-metal forming CO and CO2 |
| R. Germanium | III. Metalloid |
| S. Lead | IV. Non-metal, second most abundant element in the crust |
- P-II, Q-IV, R-III, S-I
- P-II, Q-III, R-IV, S-I
- P-I, Q-IV, R-III, S-II
- P-IV, Q-II, R-III, S-I
General
✓✗Which of the following trends is correct for the group 14 halides?
- PbX4 are the most stable tetrahalides
- MX2 halides become more ionic and more stable down the group
- CX2 are stable compounds
- MX4 halides become more stable down the group
General
✓✗The first ionisation enthalpy of group 13 elements is lower than that of the corresponding group 2 elements because
- group 2 elements are non-metals
- group 13 atoms are larger
- the np1 electron is less tightly held (more shielded) than an ns electron
- group 13 atoms have more protons only
General
✓✗The maximum covalency of boron is
- 3
- 4
- 5
- 6
General
✓✗The C−C bond length in diamond is 154 pm and the interlayer distance in graphite is 340 pm. The large interlayer distance shows that
- graphite is ionic
- graphite has a three-dimensional network like diamond
- the layers in graphite are held together by weak van der Waals forces
- graphite layers are covalently bonded
General
✓✗In diamond, each carbon atom is
- not hybridised
- sp hybridised
- sp2 hybridised and bonded to three carbon atoms
- sp3 hybridised and bonded to four other carbon atoms
General
✓✗How many electrons are present around the central atom in [BF4]−?
- 4
- 8
- 10
- 6
General
✓✗Which of the following group 14 elements exhibits allotropy in the metallic and non-metallic forms (grey and white)?
- Silicon
- Lead
- Tin
- Carbon
General
✓✗Match List I (allotrope) with List II (feature).
Choose the correct answer from the options given below.
| List I | List II |
| P. Diamond | I. Soccer-ball shaped molecule |
| Q. Graphite | II. Three-dimensional network, insulator |
| R. Fullerene C60 | III. Layers, good conductor |
| S. Carbon black (amorphous) | IV. Microcrystalline graphite, used as a black pigment |
- P-II, Q-III, R-I, S-IV
- P-III, Q-II, R-I, S-IV
- P-II, Q-I, R-III, S-IV
- P-I, Q-III, R-II, S-IV
General
✓✗Tl3+ compounds are good oxidising agents because
- Tl+ is more stable than Tl3+
- Tl has a high electronegativity
- Tl is a non-metal
- Tl3+ is more stable than Tl+
General
✓✗Which one of the following statements about zeolites is false?
- Zeolites are aluminosilicates having a three-dimensional network.
- Some of the SiO44− units are replaced by AlO45− and AlO69− ions in zeolites.
- They have an open structure which enables them to take up small molecules.
- They are used as cation exchangers.
General
✓✗Fullerene C60 contains
- 20 five-membered and 12 six-membered rings
- 60 six-membered rings
- 12 five-membered and 20 six-membered rings
- only five-membered rings