One gas bleaches the colour of flowers by reduction, while the other gas bleaches by oxidation. The two gases, respectively, are:

1. CO and Cl2                             

2. H2S and Br2

3. NH3 and SO3                           

4. SO2 and Cl2

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Which of the following halides cannot be hydrolysed at room temperature?

  (I) TeF6                    (II) SF6                    (III) NCl3                          (IV) NF3

(1) III and IV                               

(2) I, II and III

(3) I, II and IV                             

(4) II and IV

 

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Which parent oxy acid does not have its own hypo acid?

1. H2SO2                                  
2. HNO2                                            
3. H3PO3                                        
4. HClO3

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Consider the following reactions :

(i) PCl3+3H2OH3PO3+3HCl             
(ii) SF4+3H2OH2SO3+4HF

(iii) BCl3+3H2OH3BO3+3HCl            
(iv) XeF6+3H2OXeO3+6HF

Then according to given information the incorrect statement is :

(1) During the (i) reaction the hybridisation of 15th group element does not 

      changed

(2) During the (ii) reaction the hybridisation of 16th group element 

      changed

(3) During the (iii) reaction the hybridisation of 13th group element does not 

      changed

(4) During the (iv) reaction the hybridisation of 18th group element does not 

      changed

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Consider the oxy acids HClOn series, here value of n is 1 to 4. Then incorrect statement regarding these oxy acids is :

(1) Acidic character of oxy acids increases with increasing value of n.

(2) oxidising power of oxy acids increases with decreasing value of n.

(3) Thermal stability of oxy acids decreases with increasing value of n.

(4) 'ClO' bond order decreases with decreasing value of n  

Subtopic:  Group 17 - Preparation, Properties & Uses |
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The correct statement regarding CIOn molecular ion is :

(1) On decreasing value of 'n', 'ClO' bond order increases 

(2) On the increasing value of 'n', 'ClO' bond length increases

(3) On the increasing value of n, oxidation number of central atom increases 

(4) On the increasing value of  n, hybrid orbitals on the central atom increase

 

Subtopic:  Group 17 - Preparation, Properties & Uses |
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In, Cl2O6(l)+HF  P+Q

If H+ of acid HF attaches with Q then correct option for hybrization of Cl-atom

and OCIO in the P and Q ions :

(a) P:sp2;>120°

(b) Q:sp3; 109°28'

(c) P:sp3;<109°28'

(d) Q:sp3;>109°28'

Subtopic:  Group 17 - Preparation, Properties & Uses |
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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 |
 70%
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