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. |
In S_(N)1 reaction of (S)-2 bromobutane with water Two subsitution products are formed one has the same relative configuration as the reactant and the other has the inverted configuration. This is in most S_(N)1 reactions, the recemic product is non-50:50 mixture i.e, recemization takes place the inverted product is more than 50% . the formation of different composition of the product is due to following stpes involved in S_(N) reactions. R-X "" to R^(+) X^(-) to R^(+) "" "solvent" X^(-) "" to R^(+)+X^(-) {:("Undissociated Molecule", "Intimate ion pair", "solvent-sperated ion pair", "dissociated ions"),(I,II,III,IV):} Which type of intermediate is formed in the reaction of (S)-2 bromobutane with water ? |
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Answer» `sp^(3)` HYBRIDIZED |
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| 2. |
In smeltingof iron, which of the following reactions takes place in Blast furnace at 400^(@)C-600^(@)C |
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Answer» `CaO_SiO_(2)rarrCaSiO_(3)` |
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| 3. |
In smelting of iron, which of thefollowing reactions takes place in blast furnace at 400^(@)C-600^(@) C ? |
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Answer» `CaO+SiO_(2) to CaSiO_(3)` |
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| 4. |
In smelting process the impurities of an ore is removed by |
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Answer» ADDITION of flux |
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| 5. |
In smelting of iron, reactions takes place in Blast furnace at 400^(@)C-600^(@)C is |
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Answer» `CaO + SiO_(2) rarr CaSiO_(3)` |
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| 6. |
In Slapter's rule, the correct arrangments of electron are according to the extent of their screening |
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Answer» `(1S, 2S), 2p` |
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| 7. |
In SIO_2, each silicon atom is covalently bonded in a tetrahedral manner to four oxygen and each oxygen atom in turn is covalently bonded to another two silicon atoms giving a three dimensional network solid.Find the total number of atoms comprising each ring forming the three dimensional network solid . |
Answer»
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| 8. |
In simple ionic crystals_____or______types of arrangement are generally -present. |
| Answer» SOLUTION :CCP or HCP | |
| 9. |
In SiF_(6)^(2-) and SiCl_(6)^(2-) which one is known and why |
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Answer» `SiF_(6)^(2-)` because of SMALL size of F |
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| 10. |
In silver extraction process Zn displaces Ag from its |
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Answer» AG(CN) salt |
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| 11. |
In silicon dioxide: |
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Answer» each silicon atom is surrounded by four OXYGEN atoms and each oxygen atom is BONDED atoms and each oxygen atom is bonded to TWO silicon atoms. |
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| 12. |
In Siemen's ozoniser, 60% O_(2) is covered to ozone. How many moles of ozone will be obtained from 10 mole of O_(2)? |
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Answer» |
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| 13. |
In sickle cell anaemia, the basis of malfunction of haemoglobin molecules is |
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Answer» reduced affinity for oxygen |
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| 14. |
In SHE, platinum act as |
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Answer» Adsorbate |
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| 15. |
In shaving soaps rapid drying is prevented by adding |
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Answer» Rosin |
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| 16. |
In SF_(6) molecule, is formed in n^(th) excited state of 's'. What is n ? |
Answer»
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| 17. |
In SF_4, S atom is ........... hybridized. |
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Answer» `sp^(3)` |
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| 18. |
In several experiments on the kinetics of reaction A+B to Products, it is observed that i) On doubling the initial concentration of A, the rate was increased by four times and ii) On doubling the initial concentration of B, the rate was increased by two times.The correct statementis |
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Answer» the reaction is first order in and second order in B `(dx)/(dt) =k[A]^2[B]` So the overall order of the reaction is 2+ 1 = 3. |
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| 19. |
In Serpeck's process, byproduct obtained in the purification of bauxite is |
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Answer» `Al_(2)O_(3)` |
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| 20. |
In separate 0.1 M aqueous solution of each of the following salts, which one will record the highest pH value? |
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Answer» SODIUM carbonate |
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| 21. |
In serpek's process, by product obtained in the purification of bauxite is: |
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Answer» `Al_2O_3` |
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| 22. |
In SeF_6 selenium is: |
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Answer» spd-hybridised |
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| 23. |
In second group, H_2 S is passed in the presence of dil. HCl because |
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Answer» HCl checks INCOMPLETE precipitation of HIGHER GROUP RADICALS |
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| 24. |
In second period of the periodic table, ionisation energy follows the order: |
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Answer» `NE GT F gt O gt N gt C gt B gt Be gt Li` |
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| 25. |
In SCN ligand if N is attached to central atom, the name of ligand is: |
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Answer» Thiocyanato-N |
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| 26. |
In SCl_(2) the central atom involves |
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Answer» `SP^(3)` hybridization |
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| 27. |
In sample of excited hydrogen atoms, electron make transition from n = 2 to n = 1. Emitted quanta strike on a metal of work functio [phi]4.2 ev. Calculate the wavelength (in Å) associated with ejected electrons having maximum kinetic energy. |
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Answer» |
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| 28. |
In salts of polyatomic anion, as polarising power of cation increase, thermal stability of the salt decrease and decomposed species may further undergo redox reaction Q. Water soluble salt(x) was heated into three products A, B and C and B and C are two different paramagnetic gases. A is red in hot condition, then salt(x) is : |
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Answer» `Hg(NO_(3))_(2)` `implies Hg(NO_(3))_(2)overset(Delta)(to) Hg+2NO_(2)(uarr)+O_(2)(uarr)` `implies FeC_(2)O_(4) overset(Delta)(to)FeO+CO(uarr)+CO_(2)(uarr)` `ZnSO_(4) overset(gt800^(@)C)(to)ZnO+SO_(2)(uarr)+(1)/(2)O_(2)(uarr)` |
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| 29. |
In salt analysis cations of group I and II precipitated in acidicmedium and therefore the solution remains acidic till group II. But from III group onwards cations precipitates in basic medium and hence filtrate of group II is to be boiled with con HNO_(3) before using it for III group. Which statements is not true for III group precipitate. |
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Answer» `(NH_(4))_(2)SO_(4)` cannot be usedin place `NH_(4)Cl` |
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| 30. |
In salts of polyatomic anion, as polarising power of cation increase, thermal stability of the salt decrease and decomposed species may further undergo redox reaction Q. Which of the followinng species undergoes non-redox thermal decomposition reaction on heating? |
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Answer» `FeSO_(4)` `SnSO_(4) overset(Delta)(to)SnO_(2)+SO_(2)(uarr)` `H_(2)C_(2)O_(4) overset(Delta)(to) CO(uarr)+CO_(2)(uarr)+H_(2)O` `2Na_(2)P_(2)O_(7)+H_(2)O` |
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| 31. |
In salt analysis cations of group I and II precipitated in acidicmedium and therefore the solution remains acidic till group II. But from III group onwards cations precipitates in basic medium and hence filtrate of group II is to be boiled with con HNO_(3) before using it for III group. Conc. HNO_(3) is added for proceeding to test III group radicals, because |
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Answer» to form NITRATES which gives granular precipitates. |
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| 32. |
In salt analysis cations of group I and II precipitated in acidicmedium and therefore the solution remains acidic till group II. But from III group onwards cations precipitates in basic medium and hence filtrate of group II is to be boiled with con HNO_(3) before using it for III group. The use of Br_(2) and NaOH to group III precipitate facilitates |
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Answer» RENDERING Al into SODIUM meta-aluminate |
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| 33. |
In S_(8)each sulphur atom is :- |
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Answer» SP hybridised with a planar ring |
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| 34. |
In s salt bridge, KCl is used because |
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Answer» it is and ELECTROLYTE |
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| 35. |
In Rosenmunds reduction, the action of BaSO_4is....... |
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Answer» PROMOTER |
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| 36. |
In Rosenmund's reduction reaction .................... is the catalyst and ............. is the catalytic poison. |
| Answer» SOLUTION :`PD, BaSO_4` | |
| 37. |
In Rosenmund reduction, which of the following does not poison the catalyst Pd? |
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Answer» a.`BaSO_(4)` GROUP to `(-CH_(2)-)` group. So the answer is `(d)`. |
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| 38. |
In rosenmund reduction, benzoyl chloride in boiling xylene is reduced to benzaldehyde in presence of______. |
| Answer» SOLUTION :`H_(2)-Pd//BaSO_(4)`, | |
| 39. |
In roasting : |
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Answer» MOISTURE is removed `4M(M=As, SB)+3O_2to2M_2O_3uarr` `S+O_2toSO_2uarr,P_4+4O_2toP_4O_10uarr` ORGANIC matter, moisture if present in the ore, ALSO GET expelled and the ore becomes porous . |
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| 40. |
In Rosenmund reaction, presence of BaSO_(4) acts as ………….for Pd. |
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Answer» promoter `- COCl underset(Pd//BaSO_(4)) overset (H_(2)) to- CHO` |
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| 41. |
In RNA, the sugar is ..............but in DNA, it is ............... |
| Answer» SOLUTION :RIBOSE, 2- dexyribose | |
| 42. |
In RN A number of nucleotides are joined together by |
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Answer» AMIDE linkage |
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| 43. |
In respect of the equation k = Ae^(-E_(a)//RT) in chemical kinetics , which one of the following statement is correct |
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Answer» k is equilibrium constant |
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| 44. |
In Reimer-Tiemann reaction, the medium of reaction is |
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Answer» acidic |
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| 45. |
In Reimer-Tiemann formylation reaction, molecular weight of phenol increases by |
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Answer» 27 |
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| 46. |
In reference to Freundlich adsorption isotherm, write the expression for adsorption of gases on solids in the from of an equation. |
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| 47. |
In reference to Freundlich adsorption isotherm, write the expression for adsorption of gases on solids in the form of an equation. |
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Answer» Solution :`(x)/(m)=K.p^(1/n)(n gt 1)` where x is the MASS of the gas adsorbed on mass m of the adsorbent at pressure P. k and n are CONSTANTS which depend UPON the nature of adsorbent and the gas at a PARTICULAR temperature. |
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| 48. |
In reactin (1), XeF_(6) hydrolysis to form HF and X. In reaction (2), XeF_(6) on partial hydrolysis from HF, Y and Z. The product X,Y,Z respectively, are |
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Answer» `XeO_3, XE, XeO_2F_2` |
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| 49. |
In a redox reaction, H_2 O_2 oxidizes K_4 [Fe (CN)_6] into Fe^(3+), CO_(3)^(2-) and NO_(3)^(-) ions in acidic medium, then how many moles of H_2 O_2 will react with 1 mole of K_4 [Fe (CN)_6] |
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Answer» 5 moles |
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| 50. |
In reaction PCI_5 (g) hArr PCI_3(g)+CI_2(g) at 27^@Cand density was 0.5 gm/cc when reaction was not started . What will be the partial pressure of PCI_3 at equilibrium ? The CI_2 present at equilibrium when reacts with the excess of benzene in presence of a Lewis acid produces 56.2 gm of monochloro benzene only K_c =1.66 xx10^(-1) |
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Answer» <P> SOLUTION :`P_(PCI_3)=0.04 ATM` |
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