The physical property of a hydride of group 16 that decreases down the group is:

1. Melting point. 2. Thermal stability.
3. Boiling point. 4. Critical temperature. 

Subtopic:  Group 16 - Preparation, Properties & Uses |
 79%
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Which of the following statements about acid strength is false?

1. HI>HBr>HCl                               

2. HIO4>HBrO4>HCIO4

3. HClO4>HClO3>HClO2                 

4. HF>H2O>NH3 

Subtopic:  Group 16 - Preparation, Properties & Uses |
 55%
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Concentrated nitric acid reacts with iodine to give :

(1) HOI                             

(2) HI

(3) HIO3                         

(4) HIO4

Subtopic:  Group 15 - Preparation, Properties & Uses |
 89%
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Thermally most stable compound is :

(1) HOCIO3                             

(2) HOCIO2

(3) HOCl                                 

(4) HOCIO 

Subtopic:  Group 17 - Preparation, Properties & Uses |
 58%
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Which of the following halogen oxide  is used for estimation of carbon monoxide in automobile exhaust gases?

(1) Cl2O7                                 

(2) I2O5

(3) ClO2                                   

(4) BrO3

Subtopic:  Group 17 - Preparation, Properties & Uses |
 61%
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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 |
 88%
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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 |
 54%
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