General
✓✗Which of the following hydroxides is amphoteric?
- In(OH)3
- TlOH
- Al(OH)3
- B(OH)3
General
✓✗Assertion: The atomic radius of thallium is only slightly larger than that of indium.
Reason: The 4f and 5d electrons in Tl shield the nuclear charge poorly.
Reason: The 4f and 5d electrons in Tl shield the nuclear charge poorly.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Arrange the following oxides in increasing order of acidic character: Al2O3, B2O3, Tl2O, In2O3
- B2O3 < Al2O3 < In2O3 < Tl2O
- In2O3 < B2O3 < Al2O3 < Tl2O
- Al2O3 < Tl2O < B2O3 < In2O3
- Tl2O < In2O3 < Al2O3 < B2O3
General
✓✗Which of the following has the central atom in the sp2 hybridised state?
- CCl4
- BCl3
- SiCl4
- [AlCl4]−
General
✓✗The diagonal relationship of boron is with
- aluminium
- beryllium
- silicon
- carbon
General
✓✗Which of the following statements about H3BO3 is not correct?
- It is a strong tribasic acid.
- It does not act as a proton donor but acts as a Lewis acid by accepting a hydroxide ion.
- It is prepared by acidifying an aqueous solution of borax.
- It has a layer structure in which planar BO3 units are joined by hydrogen bonds.
General
✓✗The tendency of the group 14 tetrachlorides to undergo hydrolysis follows the order
- CCl4 < SiCl4
- CCl4 = SiCl4
- CCl4 > SiCl4
- neither is hydrolysed
General
✓✗Graphite conducts electricity along its layers but not perpendicular to them because
- the layers are joined by covalent bonds
- delocalised π electrons move freely only within each layer
- it contains ions between the layers
- graphite is a metal
General
✓✗The C−C bond in diamond and the C−C bond within the layers of graphite have lengths of 154 pm and 141.5 pm respectively. The shorter bond in graphite is due to
- sp3 hybridisation
- ionic bonding
- partial double-bond character from delocalised π bonding
- van der Waals forces
General
✓✗Metallic character in group 14
- decreases down the group
- increases down the group
- remains the same
- is maximum for carbon
General
✓✗The most stable oxidation state of thallium is
- +1
- +2
- +3
- +5
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
✓✗Which of the following does NOT contribute to the anomalous behaviour of carbon?
- Its high electronegativity
- Its high ionisation enthalpy
- Its small size
- The availability of vacant d orbitals
General
✓✗Electronegativity in group 13 decreases from B to Al and then
- increases sharply
- changes only marginally down the group
- decreases sharply to Tl
- becomes zero
General
✓✗Statement I: Silicon dioxide is a gas at room temperature like carbon dioxide.
Statement II: Silicon does not form stable pπ−pπ bonds with oxygen.
Statement II: Silicon does not form stable pπ−pπ bonds with oxygen.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct