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Q. No.
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
1. Cl2 > Br2 > F2 > l2
2. Br2 > l2 > F2 > Cl2
3. F2 > Cl2 > Br2 > l2
4. l2 > Br2 > Cl2 > F2
Subtopic:  Group 17 - Preparation, Properties & Uses |
 73%
Level 2: 60%+
NEET - 2016
Hints
Select the correct option based on statements below:
Assertion (A): Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2.
Reason (R): Oxygen forms  pπ   -   pπ multiple bonds due to its small size and small bond length but  pπ   -   pπ bonding is not possible in sulphur.
    
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Group 16 - Preparation, Properties & Uses |
 73%
Level 2: 60%+
Hints
Identify the incorrect statement from the following:
1. The acidic strength of HX (X=F, Cl, Br and I) follows the order: HF > HCI > HBr >HI
2. Fluorine exhibits - 1 oxidation state whereas other halogens exhibit +1, +3, +5 and +7 oxidation states also.
3. The enthalpy of dissociation of F2 is smaller than that of Cl2.
4. Fluorine is stronger oxidising agent than chlorine.
Subtopic:  Group 17 - Preparation, Properties & Uses |
 71%
Level 2: 60%+
NEET - 2024
Hints
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Among the following reactions,  N2 is not generated by heating:

1. (NH4)2Cr2O7

2. NH4Cl + NaNO2

3. NH4Cl + CaO

4. Ba(N3)2

Subtopic:  Group 15 - Preparation, Properties & Uses |
 72%
Level 2: 60%+
Hints
Links

Oxygen forms hydrogen bonds while chlorine does not, because :

1. Chlorine has a bigger size and as a result, a higher electron density per unit volume.
2. Oxygen has a smaller size and as a result, a lower electron density per unit volume.
3. Oxygen has a smaller size and as a result, a higher electron density per unit volume.
4. Oxygen has a bigger size and as a result, a higher electron density per unit volume.

Subtopic:  Group 16 - Preparation, Properties & Uses |
 74%
Level 2: 60%+
Hints
Among Group 16 elements, which one does NOT show -2 oxidation state?
1. Se 2. Te
3. Po 4. O
Subtopic:  Group 16 - Preparation, Properties & Uses |
 70%
Level 2: 60%+
NEET - 2024
Hints
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Select the correct option based on the statements below:
 
Assertion (A): ICl is more reactive than I₂.
Reason (R): I-Cl bond is weaker than I-I bond.
 
1. (A) is False but (R) is True.
2. Both (A) and (R) are True and (R) is the correct explanation of (A).
3. Both (A) and (R) are True but (R) is not the correct explanation of (A).
4. (A) is True but (R) is False.
Subtopic:  Group 17 - Preparation, Properties & Uses |
 74%
Level 2: 60%+
NEET - 2022
Hints

The compound among the following with the lowest pKa value is?

1. H2O

2. H2S

3. H2Se

4. H2Te

Subtopic:  Group 16 - Preparation, Properties & Uses |
 75%
Level 2: 60%+
Hints

The disproportionation reaction of H3PO3 is as follows:

H3PO3 →∆ X + Y

 X and Y in the above reaction are:

1. H3PO2, HPO2  

2. H3PO4, PH3

3. H2PO6, PO3

4. None of the above.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 75%
Level 2: 60%+
Hints
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False statement regarding PCl5 is:

1. PCl5 molecule is non-reactive.
2. Three equatorial P-Cl bonds make an angle of 120° with each other.
3. Two axial  P-Cl bonds make an angle of 180° with each other.
4. Axial P-Cl bonds are longer than equatorial P-Cl bonds.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 76%
Level 2: 60%+
NEET - 2019
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