Incorrect statement regarding following reactions is :

(a) 'X' is explosive

(b) 'Y' is an oxyacid of xenon

(c) Both are example of non-redox reaction

(d) XeF6 can undergo partial hydrolysis

Subtopic:  Group 18 - Preparation, Properties & Uses |
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Which of the following noble gas does not form clathrate compound?

(a) Kr

(b) Ne

(c) Xe

(d) Ar

Subtopic:  Group 18 - Preparation, Properties & Uses |
 70%
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Hints

Correct order of bond angle in given species is :

(a) SiO44->PCl3>NCl3>SbH3>H2Te

(b) SiO44->NCl3>PCl3>SbH3>H2Te

(c) SiO44->H2Te>SbH3>PCl3>NCl3

(d) NCl3>PCl3> SiO44->SbH3>H2Te

Subtopic:  Group 16 - Preparation, Properties & Uses |
 59%
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Hints

The incorrect order is:

(a) N>P>As : Strength of πbond with oxygen atom

(b) SiF4>SiCl4>SiBr4>Sil4 : Thermal stability

(c) H2S>H2Se>H2Te : Arrhenious acid character

(d) CaBr2>MgBr2>BeBr2 : Melting point

Subtopic:  Group 16 - Preparation, Properties & Uses |
 73%
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Among the following cyclic species are :

(I) H5P3O10           (II) B3O3OH52-            (III) H5P5O15            (IV) P3N3Cl6

(a) I, III

(b) I, III, IV

(c) II, III, IV                                                  

(d) I, II, III, IV

 

Subtopic:  Group 15 - Preparation, Properties & Uses |
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HCN+H2OX+NH3

XY+H2O

(Unbalanced equations)

[Y] May be prepared by which one of the following methods?

[A] By dehydration of malonic acid with P2O5

[B] By thermal decomposition of carbon sub-oxide in air.

[C] By heating potassium hyxacyaanoferrate (II) with conic H2SO4

[D] By the action of conc. HNO3 on charcoal  

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Hints

Select the correct statement about elements of group 15th.

(A) The order of stability of oxidation state for +3 is Bi3+>Sb3+>As3+ and for +5 is Bi5+<Sb5+<As5+

(B) In the case of nitrogen, all oxidation states from +1 to +4 tend to disproportionate in acid solution.

(C) There is considerable increase in covalent radius from N to P but from As to Bi only a small increase in covalent radius is observed.

(D) All of these.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 84%
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Which of the following compounds does not give nitrogen on heating?

(1) NaN3                                                     

(2) NH42SO4

(3) NH4NO2                                               

(4) NH42Cr2O7

Subtopic:  Group 15 - Preparation, Properties & Uses |
 70%
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A brown-coloured mixture of two gases is obtained by reducing 6 N nitric acid with metallic copper. This mixture on cooling condenses to a blue liquid which on freezing (-30 oC) gives a blue solid. The correct statement for the blue liquid or solid is: 

1. It is referred to as the anhydride of nitrous acid.
2. It is an acidic oxide. Hence, it dissolves in alkalies producing nitrites.
3. It can also be prepared by the action of 50 % HNO3 on arsenious oxide and then cooling to 250 K.
4. All of the above.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 82%
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Hints

Which of the following statements is false?  

1. Nitrous oxide supports combustion more vigorously than air.
2. Phosphorous pentaoxide dehydrates nitric acid-forming nitrogen pentaoxide.
3. Reactivity order of various allotropic forms of phosphorous is white > red > black.
4. Red phosphorous changes to white phosphorus on heating in the atmosphere of  CO 2   or coal gas at 573 K.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 65%
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