Which of the statements given below is incorrect?

1. Cl2O7 is an anhydride of perchloric acid

2. O3 molecule is bent

3. ONF is isoelectronic with NO2-

4. OF2 is an oxide of fluorine

Subtopic:  Group 17 - Preparation, Properties & Uses | Group 16 - Preparation, Properties & Uses |
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The variation of the boiling point of the hydrogen halides is in the order HF > HI > HBr > HCl.
What explains the higher boiling point of hydrogen fluoride?

1. The electronegativity of flourine is much higher than other elements in the group
2. There is strong hydrogen bonding between HF molecules
3. The bond energy of HF molecules is greater than in other hydrogen halides
4. The effect of nuclear shielding is much reduced in flourine which polarizes the HF molecule
Subtopic:  Group 17 - Preparation, Properties & Uses |
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The strong reducing behaviour of H3PO2 is due to

1. Presence of one -OH group and two P-H bonds

2. High electron gain enthalpy of phosphorus

3. High oxidation state of phosphorus

4. Presence of two -OH groups and one P-H bonds

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
1. Forms acid-rain

2. Is a reducing agent

3. Is soluble in water

4. Is used as a food-preservative

Subtopic:  Group 15 - Preparation, Properties & Uses |
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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 |
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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 |
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Which of the following is incorrect with regards to oxoacids of phosphorus? 

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 |
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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 |
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In which of the following arrangements the given sequence is not strictly according to the property indicated against it ?

1. H2H2S H2Se H2Te: increasing pKa values
2. NH3 <  PHAsHSbH3: increasing  acidic character 
3. 
CO2 SiO2 SnO2 PbO2: increasing oxidising power 
4. 
HHCl HBHI : increasing acidic strength

Subtopic:  Group 17 - Preparation, Properties & Uses | Group 16 - Preparation, Properties & Uses | Group 15 - Preparation, Properties & Uses |
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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 |
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