This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
HI cannot be prepared by adding conc. H_(2) SO_(4) to iodides because |
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Answer» HI is a stronger ACID than `H_(2) SO_(4)` |
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| 2. |
Heating rubber with sulphur is known as |
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Answer» GALVANISATION |
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| 3. |
HI can not be prepared by which of the following methods ? |
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Answer» `Pl_(3) + H_(2)O to ` |
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| 4. |
Heatingpyrites to removesulphur is called |
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Answer» SMELTING |
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| 5. |
HgS issoluble in aque regain forming HgCI_(2) What happens if Cu ruranings are added to HgCI_(2)? |
| Answer» Solution :`HgCI_(2) + Cu RARR CuCI_(2) + Hg + Hg` is deposite on `Cu` | |
| 6. |
HgS_((s)) + O_(2(g)) rarr Hg_((l)) +SO_(2) uarr The above reaction is an example of _______ reduction. |
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Answer» metal |
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| 7. |
Heating pyrites to remove sulphur is called |
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Answer» SMELTING |
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| 8. |
Hg(NO_(3))_(2) overset(Delta) toW + X + O_(2) X + H_(2)O rarr HNO_(2) + HNO_(3) W + HNO_(3) rarr Y + NO + H_(2)O Y + Na_(2)S_(2)O_(3) ("excess") rarr 2 + NaNO_(3) |
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Answer» `{:("W"," X","Y","Z"),(Hg,N_(2)O,Hg(NO_(3))._(2),Na_(2)[Hg(S_(2)O_(3))_(2)]):}` `2NO_(2) +H_(2)O rarr HNO_(2) +HNO_(3)` `underset((W))(Hg)+4HNO_(3) overset(Delta)rarr underset((Y))(Hg(NO_(3))_(2)) +2NO uarr+2H_(2)O` `Hg(NO_(3))_(2)+underset(("Soluble"))(Na_(2)S_(2)O_(3))rarr Na_(2) [Hg(S_(2)O_(3))_(2)] +2NaNO_(3)` |
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| 9. |
Heating pyrites in air to remove sulphur is known as |
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Answer» ROASTING |
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| 10. |
Heating of rubber with sulphur is known as |
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Answer» Galvanisaiton |
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| 11. |
HgO+Cl_(2)+H_(2)O rarr HgOHgCl_(2) + ( X )The oxidation state of central atom of 'X' is |
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Answer» X is HOCl. Central atom Cl is in `+1` STATE. |
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| 12. |
HgO do not require reducing agent while isolation because |
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Answer» HIGH + ve `DELTA G^(@)` |
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| 13. |
Heating of pyrites in air for oxidation of sulphur is called Heating of ore in presene of air toremove sulphure impurities is called |
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Answer» Roasting `S+O_(2)toSO_(2)` |
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| 14. |
HgI_(2)darr+KI hArrK_(2)[HgI_(4)] |
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Answer» For PRECIPITATE formation formation reaction |
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| 15. |
Heating of pyrites in presence of air to remove sulphur is called as: |
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Answer» ROASTING |
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| 17. |
Heating of pyrites in air for oxidation of sulphur is called |
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Answer» ROASTING |
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| 18. |
HgCl_2is reduced to Hg_2Cl_2 by |
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Answer» `CH_4COOH` |
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| 19. |
HgCl_(2) givesorange ppt , with (a) ___, whichdissolves in oxicess of itforming (b) ____ called (c ) ____. |
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Answer» |
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| 20. |
Heating of pyrite ores in air to remove sulphur is known as : |
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Answer» Calcination |
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| 21. |
Heating pyrites to remove sulphur is called : |
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Answer» Calcination |
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| 23. |
HgCl_(2) and l_(2) both when dissolved in water containing I^(-) ions, the pair of species formed is…. |
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Answer» `HG I_(2), I_(3)^(-)` `HgCl_(2) + 4I^(-) rarr [Hg I_(4)]^(2-) + 2Cl^(-)` |
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| 24. |
Heating of oxalic acid with cone. H_2SO_4 gives: |
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Answer» `CO+O_2` |
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| 25. |
HgCl is a covalent compound, sparingly soluble in water, the solubility increase by the addition of chloride ions due to: |
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Answer» COMMON ion effect |
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| 26. |
Heating of oxalic acid with conc. H_2 SO_4 gives |
| Answer» SOLUTION :`H_(2)C_(2)O_(4) OVERSET(Conc. H_(2)SO_(4)//Delta)to H_(2)O+Couarr+CO_(2)uarr` | |
| 27. |
HgCI_(2)+ "excess of" KI rarr (A) underset(NH_(3)) to (B) ,(A) and (B)respectively are |
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Answer»
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| 28. |
Hg_(2)Cl_(2) is black enedby NH_(3) due toformation ofiodideof millon's base |
Answer»
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| 29. |
Heating of ores with flux to remove non fusible mass is called: |
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Answer» SMELTING |
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| 30. |
Hg_(2)^(2+) when reacts with H_(2)S, black ppt. (A) formed which when reacts with Na_(2)S followed by filtration leaving behind black ppt. (B). The filitrate with H^(+) gives black ppt. (C). A, B and C are: |
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Answer» `Hg_(2)S,HG,HGS` |
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| 31. |
Heating ofpyrites in air to remove sulphur is called : |
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Answer» CALCINATIONS |
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| 32. |
Heating of (CH_3 )_2 SiCl_2 in the presence of water gives |
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Answer» `(CH_3 )_2 Si=O` |
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| 33. |
Hg_(2)Cl_(2) aprecipitate if (a) ____is greaterthan K_(sp) (Hg_(2)Cl_(2)). |
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Answer» |
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| 34. |
Heating of alkanes with fuming sulphuric acid or oleum at high temperature, which forms sulphonic acid, is called |
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Answer» Nitration |
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| 35. |
Hg sticks to the surface of glass when it comes into contact with |
| Answer» Answer :D | |
| 36. |
Heating of carbonate ores to remove carbon is called as : |
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Answer» Roasting |
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| 37. |
Heating mixture of sodium benzoate and soda-lime gives |
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Answer» benzene |
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| 38. |
HF present as impurity in gaseous fluorine can be removed by passing over |
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Answer» `P_(2)P_(5)` |
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| 39. |
Heating mixture of Cu_(2)O and Cu_(2)S will give…….. |
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Answer» `CU+SO_(2)` |
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| 40. |
HF is not kept inside |
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Answer» GLASS BOTTLE |
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| 41. |
Heating in aqueous solution of aluminium chloride to dryness will give |
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Answer» `Al(OH)Cl_(2)` `AlCl_(3)+3H_(2)O to Al(OH)_(3)+3HCl` On heating it TILL dryness `Al(OH)_(3)` is converted into `Al_(2)O_(3)` 2Al(OH)_(3) overset(Delta) to Al_(2)O_(3)`. |
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| 42. |
HF present as impurity in gaseous F_2 can be removed by passing over |
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Answer» `P_2O_5` |
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| 43. |
Heating a mixture of Cu_2O and Cu_2S will give |
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Answer» `CU +SO_2` |
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| 45. |
HF is a weak acid but HCl is a strong acid because: |
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Answer» HF is less IONIC than HCl |
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| 46. |
Heating mixture of Cu_(2) O and Cu_(2) S will give |
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Answer» `CU+ SO_(2)` |
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| 47. |
Heating mixtureofCu_2 OandCu_ 2 Swill give |
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Answer» ` CU + SO_2` |
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| 48. |
Heating Cu_2O and Cu_2S will give : |
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Answer» `CU + SO_4` |
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| 49. |
Heating an ore in a regular supply of air in a furnace at a temperature below the melting point is called |
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Answer» calcination |
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| 50. |
Heating a mixture of ethyl alcohol and acetic acid in presence of conc. H_(2)SO_(4) produces a fruity smelling compound. This reaction is called |
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Answer» Neutralisation It is called esterification reaction. |
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