General
✓✗XeF6 on partial hydrolysis gives
- XeF4
- Xe and O2
- XeOF4 and XeO2F2
- XeO3 only
General
✓✗Assertion: Nitrogen does not form pentahalides.
Reason: Nitrogen has no d orbitals in its valence shell.
Reason: Nitrogen has no d orbitals in its valence shell.
- 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
✓✗Which statement about polonium is correct?
- It is a non-metal
- It shows only the −2 oxidation state
- It is a gas at room temperature
- It is a radioactive metal
General
✓✗When chlorine is passed over dry slaked lime at room temperature, the main product is
- Ca(ClO2)2
- bleaching powder, CaOCl2
- Ca(ClO3)2
- CaCl2
General
✓✗The two O−O bonds in ozone are
- unequal, one single and one double
- both triple bonds
- equal in length, because of resonance
- both pure single bonds
General
✓✗Down group 15, the covalent radius
- increases, with only a small increase from As to Bi
- remains constant
- decreases regularly
- first decreases and then increases
General
✓✗The hybridisation of S in SO42− is
- sp2
- sp3d
- sp3
- dsp2
General
✓✗Which of the following has the greatest electron affinity?
- I
- Cl
- F
- Br
General
✓✗The anomalous properties of oxygen compared with the rest of group 16 include all of the following except
- oxygen forms hexahalides
- oxygen exists as a diatomic molecule with a double bond
- oxygen forms strong hydrogen bonds
- oxygen has a maximum covalency of 4
General
✓✗Xenon fluorides are formed by direct reaction of xenon with
- oxygen
- hydrogen
- fluorine
- chlorine
General
✓✗The stability of the +5 oxidation state in group 15
- is maximum for Bi
- decreases down the group
- increases down the group
- is the same for all elements
General
✓✗Match List I (atom/molecule) with List II (property).
Choose the correct answer from the options given below.
| List I | List II |
| A. Nitrogen atom | I. Paramagnetic |
| B. Fluorine molecule | II. Most reactive element in group 18 |
| C. Oxygen molecule | III. Element with the highest ionisation enthalpy in group 15 |
| D. Xenon atom | IV. Strongest oxidising agent |
- A-III, B-I, C-IV, D-II
- A-I, B-IV, C-III, D-II
- A-II, B-IV, C-I, D-III
- A-III, B-IV, C-I, D-II
General
✓✗XeF6 is formed by heating xenon with fluorine in the ratio
- 1 : 5 at 873 K and 7 bar
- 1 : 1 at room temperature
- 2 : 1 at 673 K
- 1 : 20 at 573 K and 60−70 bar
General
✓✗SO2 acts as a reducing agent, but TeO2 acts as an oxidising agent. This is because
- SO2 has no lone pair
- S is more electronegative than Te
- the +6 state becomes less stable and the +4 state more stable down the group
- TeO2 is a gas
General
✓✗Statement I: Acid strength increases in the order HF << HCl << HBr << HI.
Statement II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.
In the light of the above statements, choose the correct answer from the options given below.
Statement II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.
In the light of the above statements, choose the correct answer from the options given below.
- Statement I is incorrect but Statement II is true
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is correct but Statement II is false