Bromine is commercially prepared from sea water by displacement reaction 

                       Cl2+Br(aq)  2Cl(aq)+Br2

Br2 gas thus formed is dissolved into solution of Na2CO3 and then pure Br2 is obtained by treatment of the solution with :

 

(a) Ca(OH)2

(b) NaOH

(c) H2SO4 

(d) HI

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Cl2(g) + Ba(OH)→ X(aq) + BaCl2 + H2O                      
X + H2SO4 → Y + BaSO4                                              
\(\xrightarrow[]{\Delta \ > \ 365 \ K}\) Z + H2O + O2

Y and Z are respectively :
1. HClO4, ClO2
2. HClO3, ClO2
3. HClO3, ClO6
4. HClO4, Cl2O7

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Auto-oxidation of bleaching powder gives :

(1) only calcium chlorate                       

(2) only calcium chloride

(3) only calcium hypochlorite                 

(4) both (a) and (b) 

Subtopic:  Group 17 - Preparation, Properties & Uses |
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The three elements X, Y and Z with electronic configuration shown below all form hydrides :

            Element                                     Electronic configuration
      X                                                  1s22s22p2
      Y                                                  1s22s22p63s1 
      Z                                                   1s22s22p63s23p63d104s24p5

Which set of properties match correctly with properties of the hydrides of these elements :

     Hydride of X                                      Hydride of Y                                   Hydride of Z

(a) Colourless gas insoluble in        Silver/grey solid reacts with H2O      Colourless gas forms a strong

        H2O                                        to form an alkali                                 acid in H2O

(b) Colourless liquid, no reaction    Silver/grey solid forms H2 and          Ionic solid with formula ZH

        with H2O                                  H2O                                

(c) Non-polar compound reacts       Silver/grey ionic solid with               Forms when water is added

     with Cl2 in light                            formula YH2                                 to phosphorus and element Z

(d) Colourless gas which burns        Silver/grey solid which reacts           Colourless, corrosive liquid

          with air                                     violently with acids                             at STP

Subtopic:  Group 17 - Preparation, Properties & Uses |
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The incorrect order is :

(a) HF<HCl<HBr<Hl : Acidic strength
(b) HF>HCl>HBr>Hl : Thermal stability
(c) HF>HCl>HBr>Hl : Boiling point 
(d) HF>HCl>HBr>Hl : Bond dissociation enthalpy

Subtopic:  Group 17 - Preparation, Properties & Uses |
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The correct statement among the following  is when XeF2 and XeF6  are separately hydrolyzed;

1. Both give out O2

2. XeF6 gives O2 and XeF2 does not

3. XeF2 alone gives O2 

4. Neither of them gives HF

Subtopic:  Group 18 - Preparation, Properties & Uses |
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MF+XeF4 'A'  (M+=Alkali metal cation)

The state of hybridisation of the central atom in 'A' and shape of the species are:

(a) sp3d, TBP 

(b) sp3d3, pentagonal planar

(c)  sp3d2, distorted octahedral

(d) No compound formed at all

Subtopic:  Group 18 - Preparation, Properties & Uses |
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XeF6 dissolves in anhydrous HF to give a good conducting solution that contains-

1. H+ and \(XeF_{7}^{-}\) ions
2. \(HF_{2}^{-}\) and \(XeF_{5}^{+}\) ions
3. \(HXeF_{6}^{+}\) and F- ions
4. None of the above

Subtopic:  Group 18 - Preparation, Properties & Uses |
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Which of the following statements about helium is false?

1. It has the lowest boiling point 

2. It has the highest first ionization energy

3. It can diffuse through rubber and plastic material

4. It can form clathrate compounds

Subtopic:  Group 18 - Preparation, Properties & Uses |
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Which of the following is an uncommon hydrolysis product of XeF2 and XeF4?

(a) Xe

(b) XeO3

(c) HF

(d) O2

 

Subtopic:  Group 18 - Preparation, Properties & Uses |
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