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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. |
The mixture containing the same number of molecules as that of 14 g of CO is |
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Answer» 14g of nitrogen + 16G of oxygen `14g=(14)/(28)=(1)/(2)` moles `7gmN_(2)+8gmO_(2)` `(7)/(28)+(8)/(32)=(1)/(4)+(1)/(4)=(1)/(2)` |
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| 2. |
The mixing or redistribution of energy among the atomic orbitals is known as hybridisation. In hybridisation each electron can be described by its wave function psi. BF_(3) form adduct with NH_(3) as Lewis acid-base reaction, in which atom hybridisation will change? |
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Answer» both N and B |
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| 3. |
The mixing or redistribution of energy among the atomic orbitals is known as hybridisation. In hybridisation each electron can be described by its wave function psi. In which of the following species lone pair - bond pair repulsion is maximum |
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Answer» `NH_(3)` |
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| 4. |
The minimum temperature at which CO_2 gas at 73 atm appears first as liquid |
| Answer» ANSWER :C | |
| 5. |
The minimum real charge on any particle which can exist is |
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Answer» `1.6xx10^(-19)` COULOMB |
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| 6. |
The minimum quantity of sodium chloride which is necessary to precipitate 10 litres of sol in two hours in 0.585 gm. The flocculation value of sodium chloride is:- |
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Answer» 0.585 |
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| 8. |
The minimum number of carbon atoms in ethers to show metamerism :- |
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Answer» 3 |
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| 9. |
The number of carbon atoms present in a smallest alkane which can exhibit optical isomerism |
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Answer» 4 
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| 10. |
A minimum number of C atoms for a saturated hydrocarbon to exhibit optical isomerism (not consid ered isotopes of hydrogen) |
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Answer» 4  TOTAL .7. CARBONS |
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| 11. |
The minimum number of C atoms an alkyne must have to show diastereomerism: |
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Answer» 4  MINIMUM number of C atoms required to SHOW diastereomers if five . |
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| 12. |
The minimum number of carbon atoms to be present to write an ester is |
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Answer» 4  Minimum number of C ATOMS REQUIRED to SHOW DIASTEROMERS is five . |
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| 13. |
The minimum energy required to eject electrons from the surface of a metal is called.....or....... |
| Answer» SOLUTION :THRESHOLD ENERGY, WORK FUNCTION | |
| 14. |
The minimum and maximum values of wavelength in the Lyman series of a H atom are, respectively |
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Answer» 364.3 nm and 653.4 nm |
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| 15. |
The minimum amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state in known as ionisation energy or ionisation enthalpy (IE_1) of the element. The energy required to remove the second electron from the monovalent cation is called second ionisation enthalpy (IE_2). Similarly, we have third, fourth ..... inonisation enthalpies. The values of ionisation energy depends on a number of factors such as (i) size of the atom (ii) screening effect (iii) nuclear charge (iv) half filled and fully filled orbitals (v) shape of orbital. In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right. The first ionisation energy of Mg, Al, P and S follows the order: |
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Answer» <P>`MG LT Al lt P lt S` |
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| 16. |
The minimum amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state in known as ionisation energy or ionisation enthalpy (IE_1) of the element. The energy required to remove the second electron from the monovalent cation is called second ionisation enthalpy (IE_2). Similarly, we have third, fourth ..... inonisation enthalpies. The values of ionisation energy depends on a number of factors such as (i) size of the atom (ii) screening effect (iii) nuclear charge (iv) half filled and fully filled orbitals (v) shape of orbital. In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right. Compared to the second ionisation energy of an atom, the third ionisation |
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Answer» the same |
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| 17. |
The minimum amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state in known as ionisation energy or ionisation enthalpy (IE_1) of the element. The energy required to remove the second electron from the monovalent cation is called second ionisation enthalpy (IE_2). Similarly, we have third, fourth ..... inonisation enthalpies. The values of ionisation energy depends on a number of factors such as (i) size of the atom (ii) screening effect (iii) nuclear charge (iv) half filled and fully filled orbitals (v) shape of orbital. In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right. In a period, the ionisation energy is lowest for the : |
| Answer» Answer :D | |
| 18. |
The minerals having silicate chains are collectively called |
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Answer» Olivine |
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| 19. |
The mineral haematite, Fe_2O_3 consists of a cubic close packed array of oxide ions with Fe^(3+) ions occupying interstitial positions. Predict whether the iron ions are in the octahedral or tetrahedral holes. Radius of Fe^(3+)=0.65 Å and that of O^(2-)=1.45 Å |
| Answer» Solution :`r_+ //r_` =0.65 Å/ 1.45 Å which lies in the range 0.414-0.732 . Hence , `FE^(3+)` IONS will be in the OCTAHEDRAL HOLES. | |
| 20. |
The mineral beryl contians 5/03% beryllium by mass and contains three beryllium atoms per formula unit. Determine the formula mass of beryl. [Be = 9] |
| Answer» Answer :B | |
| 21. |
The migration of colloidal solute particles in a colloidal solution, when an electric current is applied to the solution is known as |
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Answer» Brownian movement |
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| 22. |
The micelle formed by sodium sterate in water has -COO^- group at the surface. (r) Surface tension of water is reduced by the addition of stearate. |
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Answer» IF both (A) and (R) are CORRECT and (r) is the correct EXPLANATION for (a). |
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| 23. |
The methyl group in benzene ring is : |
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Answer» ORTHO DIRECTING |
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| 24. |
The method used to remove temporaty hardness of water is : |
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Answer» SYNTHETIC RESINS method `Ca(HCO_3)_2 + Ca(OH)_2 to 2CaCO_3 + 2H_2O` |
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| 25. |
The method used to prepare rubber cloth is |
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Answer» neutral coagulation |
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| 26. |
The method used to purify petroleum, coal-tar and crude oil is |
| Answer» SOLUTION :FRACTIONAL DISTILLATION | |
| 27. |
The method used to estimate nitrogen in foods and fertilisers is…….. |
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Answer» DUMAS METHOD |
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| 28. |
The method used to estimate nitrogen in foods and fertilisers is ............ . |
| Answer» SOLUTION :Kjeldahl.s METHOD | |
| 29. |
The method used in the manufacture of aniline and turpentine is ............ . |
| Answer» SOLUTION :STEAM DISTILLATION | |
| 30. |
The method of storing of H_(2)O_(2) is |
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Answer» Plasic containers are preferred to GLASS BOTTLES (A) Plasic containers are preferred to glass bottles (B) Acetanilide added as preservative (C) The inside of the glass bottle is preferably coated with wax |
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| 31. |
The method of converting high boiling hydrocarbons into low boiling hydrocarbons is known as |
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Answer» POLYMERIZATION |
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| 32. |
The meter (unit of length ) was redefined in 1983 by .......... |
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Answer» CGPM |
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| 33. |
The metals X and Y that form oxide and nitride , when burnt in air are |
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Answer» LI and Na |
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| 34. |
The metals that cannot be obtained by electrolysis of the aqueous solution of their salts are |
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Answer» Ag |
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| 35. |
When sodium (Na) metal is dissolved in liquid ammonia ("NH"_(3)), it imparts a blue colour to the solution. This blue colouration is due to |
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Answer» Solvated electrons, `E^(-) (NH_(3) )_(y)` |
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| 36. |
The metallic Na dissolves in liquid ammonia to form a deep blue colour is due to formation of ……. |
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Answer» Solvated ELECTRON, `e(NH_3)_x^-` |
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| 37. |
The metallic lusture exhibited by sodium is due to, |
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Answer» Excitation of FREE protons |
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| 38. |
The metallic lustre exhibited by sodium is explained by |
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Answer» DIFFUSION of sodium ions |
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| 39. |
The metallic lustre of sodium is explained by the presence of |
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Answer» NA ions |
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| 40. |
The metallic luster exhibited by sodium is explained by..... |
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Answer» diffusion of SODIUM ions |
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| 41. |
The metallic elements are extracted from their respective ores by "____________". |
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Answer» PRECIPITATION reactions |
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| 42. |
The metal whichreactswithwaterat roomtemperatureis ______. |
| Answer» ANSWER :D | |
| 43. |
The metal which is a liquid at room temperature is ___________ |
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Answer» Gallium |
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| 44. |
The metal which gives H_(2) on treatment with acid as well as NaOH is |
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Answer» Fe |
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| 46. |
The metal which gives hydrogen on reacting with acid as well as sodium hydroxide is: |
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Answer» Fe `Zn+2NaOH to N_(2)ZnO_(2)+H_(2)` |
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| 47. |
The metal which can form an oxide having metal: oxygen ratio 2:3 is |
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Answer» Bi |
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| 48. |
The metal used for the debromination reaction of 1, 2 - dibromeothane |
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Answer» Na |
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| 49. |
The metal undergoing disproportionation are:Which of the following species have peroxide ion or peroxy linkage? |
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Answer» Sn `{:(Sn^(2+)rarrSn+Sn^(4+)),(CurarrCu+Cu^(2+)):}` [ Disproportionation] |
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