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 |
 72%
From NCERT
NEET - 2016
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The acidity of diprotic acids in aqueous solution increases in the order:

1. H2S < H2Se < H2Te

2. H2Se < H2S < H2Te

3. H2Te < H2S < H2Se

4. H2Se < H2Te < H2S

Subtopic:  Group 16 - Preparation, Properties & Uses |
 88%
From NCERT
AIPMT - 2014
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Which of the following compounds does not release oxygen when heated?

1. Zn(ClO3)2
2. K2Cr2O7
3. (NH4)2Cr2O7
4. KClO3

Subtopic:  Group 15 - Preparation, Properties & Uses |
 66%
From NCERT
AIPMT - 2013
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The incorrect statement regarding oxoacids of phosphorus is:

1. Orthophosphoric acid is used in the manufacture of triple superphosphate.
2. Hypophosphorous acid is a diprotic acid.
3. All oxoacids contain tetrahedral four coordinated phosphorus.
4. All oxoacids contain at least one P=O unit and one P-OH group.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 61%
From NCERT
AIPMT - 2012
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Sulphur trioxide can be obtained by which of the following reaction:

1. CaSO4+C

2. Fe2(SO4)3

3. S+H2SO4

4. H2SO4+PCl5

Subtopic:  Group 16 - Preparation, Properties & Uses |
 52%
AIPMT - 2012
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Which of the following compounds has the lowest melting point?

1.  CaBr2

2.  Cal2

3.  CaF2

4.  CaCl2

Subtopic:  Group 17 - Preparation, Properties & Uses |
 59%
AIPMT - 2011
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Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively:

1. +3, +5, +4 2. +5, +3, +4
3. +5, +4, +3 4. +3, +4, +5
Subtopic:  Group 15 - Preparation, Properties & Uses |
 86%
From NCERT
AIPMT - 2010
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The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because:

1. In NH3 as well as in NFthe atomic dipole and bond dipole are in the same direction
2. In NH3  the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
3. In NH3 as well as in NFthe atomic dipole and bond dipole are in opposite directions
4. In NH3  the atomic dipole and the bond dipole is in opposite directions whereas in NF3 these are in the same directions

Subtopic:  Group 15 - Preparation, Properties & Uses |
 80%
From NCERT
AIPMT - 2006
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The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is:

1. 2

2. 3

3. 4

4. 1

Subtopic:  Group 16 - Preparation, Properties & Uses |
 69%
From NCERT
AIPMT - 2006
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The correct thermal stability order for  \(\mathrm{H}_2 \mathrm{E , E}=\mathrm{O}, \mathrm{S}, \mathrm{Se}, \mathrm{Te} \text { and } \mathrm{Po}\) 
among the following is:

1. \(\mathrm{H}_2 \mathrm{Se}<\mathrm{H}_2 \mathrm{Te}<\mathrm{H}_2 \mathrm{Po}<\mathrm{H}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{~S}\)
2. \(\mathrm{H}_2 \mathrm{~S}<\mathrm{H}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{Se}<\mathrm{H}_2 \mathrm{Te}<\mathrm{H}_2 \mathrm{Po}\)
3. \(\mathrm{H}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{~S}<\mathrm{H}_2 \mathrm{Se}<\mathrm{H}_2 \mathrm{Te}<\mathrm{H}_2 \mathrm{PO}\)
4. \(\mathrm{H}_2 \mathrm{Po}<\mathrm{H}_2 \mathrm{Te}<\mathrm{H}_2 \mathrm{Se}<\mathrm{H}_2 \mathrm{~S}<\mathrm{H}_2 \mathrm{O}\)

Subtopic:  Group 16 - Preparation, Properties & Uses |
 70%
From NCERT
NEET - 2019
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