EAMCET QUESTIONS FROM CHAPTER VII A GROUP ELEMENTS PART-1
1.Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of Ais :
1) 104o 40¢ 2) 103o 3) 107o 4) 109o 28¢
2.Which one of the following is not correct ?
1) Oxygen shows+1 oxidation state in O2F2
2) Roasting removes volatile impurities like As and Sb 3) Sm3+ is pink in colour
4) Cobalt chloride acts as a catalyst to decompose bleaching power
3.Assertion (A) : The bond dissociation energy of fluorine is less than bromine
Reason (R): In fluorine molecule, large lone pair electronic repulsions and appreciable internuclear repulsions are present
1) Both A and R are true and R is the correct explanation of A
2) Both A and R are true but R is not the correct explanation of A
3) A is true but R is not true 4) A is not true but R is true
4.Which one of the following reactions does not occur ?
| 1) F + 2Cl- ® 2F - + Cl | 2) Cl + 2F- ® 2Cl - + F | | ||
| 2 | 2 | 2 | 2 | |
| 3) Br + 2I - ® 2Br- + I | 2 | 4) Cl | + 2Br - ® 2Cl - + Br | |
| 2 | 2 | 2 | | |
5.The compound in whihc the number of d p - pp bonds are equal to those present in ClO4-
| | 1) XeF4 | 2) XeO3 | 3) XeO4 | 4) XeF6 | | |
| 6. | Ca( OH ) 2 | Cl2 | auto-oxidation | + B | | |
| (dry ) | ¾¾¾® A ¾¾¾¾¾® CaCl | | | |||
| | -H 2O | 2 | | | | |
| | Identify B in the above reaction | | | | ||
| | 1) CaOCl2 | 2) Ca(ClO 3)2 | 3) Ca(OH)2 | 4) Ca(ClO 2)2 | | |
7.One gas bleaches the colour of flowers by reduction and another gas by oxidation, The gases
respectively are
1) SO2 and Cl2 2) CO and Cl2 3)NH3 and SO2 4) H2S and Br2
8.Which one of the following pairs of reactants does not form oxygen when they react with each other.
| (1) | F2 , NaOH solution (hot, conc.) | (2) | F2 , H 2O |
| (3) | Cl2 , NaOH solution (cold, dil.) | (4) | CaOCl2 , H2 SO4 (dil., small amount) |
9.Which of the following is used during the preparation of fluorine by Whyflaw Gray Method.
(1) aqueous KF (2) aq. HF (3) Molten KHF2 (4) NH 4F
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