For which element would XH3 be a stable species :

(a) C                                 (b) Si

(c) P                                  (d) S

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group 15 ,preparation and properties
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In case of hydride of oxygen family, which of the following physical property change regularly on moving down the group.

(a) Melting point                           (b) Thermal stability

(c) Boiling point                            (d) Critical temperature 

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group 16,preparation and properties
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In which case, the order of acidic strength is not correct ?

(a) HI>HBr>HCl                               (b) HIO4>HBrO4>HCIO4

(c) HClO4>HClO3>HClO2                  (d) HF>H2O>NH3 

Concept Questions :-

group 16,preparation and properties
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Concentrated nitric acid reacts with iodine to give :

(a) HOI                             (b) HI

(c) HIO3                          (d) HIO4

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group 15 ,preparation and properties
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Thermally most stable compound is :

(a) HOCIO3                             (b) HOCIO2

(c) HOCl                                  (d) HOCIO 

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group 17 ,preparation and properties
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Which of the following halogen oxide  is used for estimation of carbon monoxide in automobile exhaust gases?

(a) Cl2O7                                 (b) I2O5

(c) ClO2                                   (d) BrO3

Concept Questions :-

group 17 ,preparation and properties
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Only iodine forms hepta-fluriode IF7, but chlorine and bromine give penta-flurides. The reason for this is :

(a) low electron affinity of iodine

(b) unusual pentagonal bipyramidal structure of IF7

(c) that the larger iodine atom can accommodate more number iof smaller fluorine atom around it 

(d) low chemical reactivity of IF7

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Interhalogen Compounds
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Which of the following has been arranged in order of decreasing bond dissociation energy :

(a) PO>ClO>SO                  (b) PO>SO>ClO

(c) SO>ClO>PO                   (d) ClO>SO>PO 

Concept Questions :-

group 15 ,preparation and properties
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Nitrogen gas is liberated by thermal decomposition of :

(a) NH4NO2                                  (b) NaN3

(c) NH42Cr2O7                            (d) All    

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group 15 ,preparation and properties
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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 

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Oxyacids of Phosphorus/Nitrogen
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