Only iodine forms hepta-fluoride IF7, but chlorine and bromine give Penta-fluorides. The reason for this is :

(1) low electron affinity of iodine

(2) unusual pentagonal bipyramidal structure of IF7

(3) that the larger iodine atom can accommodate more number of smaller fluorine atom around it 

(4) the low chemical reactivity of IF7

Subtopic:  Interhalogen Compounds |
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Nitrogen gas is liberated by thermal decomposition of :

(1) NH4NO2                                 

(2) NaN3

(3) NH42Cr2O7                           

(4) All    

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Two oxides of nitrogen, NO and NO2 are allowed to react together at 243° K and form a coloured compound of nitrogen (X). When compound (X) reacts with water to yield another compound of nitrogen (Y). The shape of the anion of (Y) molecule is :

(a) triangular planar                              (b) triangle pyramidal

(c) tetrahedron                                      (d) square planar 

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Consider the following sequence of reaction.

Na+NH3(g)XN2OYHeatZGas Pure

Identify [Z] gas :

(a) N2

(b) NH3

(c) O2

(d) H2

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following statements is true? 

1. NH3 is less soluble than PH3 in water
2. NH3 is a stronger base and stronger reducing agent than PH3
3. NH3  has a higher boiling point than PH3 and has a lower melting point than PH3
4. PH3 is a stronger reducing agent than NH3 and it has lower melting critical temperature than NH3

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following on heating produces NO2?

(a) NaNO3                               (b) AgNO3

(c) NH4NO3                              (d) NH4NO2

Subtopic:  Group 15 - Preparation, Properties & Uses |
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A+H2OB+HCl
B+H2OC+HCl

Compound (A),(B) and (C) will be respectively :

(a) PCl5, POCl3, H3PO3                 (b) PCl5, POCl3, H3PO4

(c) SOCl2, POCl3, H3PO3               (d) PCl3, POCl3, H3PO4

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following is in the correct sequence?

[For the correct order mark (T) and for the incorrect order mark (F)]:

(a) Lewis acidity order SiFSiClSiBrSiI4
(b) Melting point NHSbHAsHPH3
(c) Boiling point NHSbHAsHPH3
(d) Dipole moment order NHSbHAsHPH3
 
(a) (b) (c) (d)
1. F T F T
2. T F T F
3. F F T T
4. F F T F
Subtopic:  Group 15 - Preparation, Properties & Uses |
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Incorrect statement regarding PH3 is:

1. It is produced by the hydrolysis of Ca3P2

2. It gives a black ppt, Cu3P2 with a CuSO4 solution.

3. It spontaneously burns in the presence of P2H4

4. It does not react with B2H6

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following compound does not produce oxyacid of central atom on hydrolysis?

(1) BF3                           

(2) NCl3

(3) SF4                           

(4) PCl5

Subtopic:  Group 15 - Preparation, Properties & Uses |
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