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. |
Pick up the incorrect statement |
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Answer» Mesomeric EFFECT occurs in conjugated compounds |
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| 2. |
Pick up the error an write the correct IUPAC names for the following. (i) 3-Pentyne (ii) 1, 6-Hexadiene (iii) 2-Ethyl-2-pentene (iv) 1, 2-Dihydroxyethane (v) Pent-4-en-1-yne. |
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Answer» |
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| 3. |
Pick up the correct statements |
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Answer» Mesomeric effect OCCURS in COMPOUNDS having conjugate SYSTEM of double bonds Due to mesomeric effect, electron pair is trans ferred completely. |
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| 4. |
Pick up the correct statement about the solution on an alkali metal in liquid ammonia |
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Answer» The SOLUTION SHOWS PARAMAGNETISM which DECREASES with increasing concentration |
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| 5. |
Pick up the correct statement |
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Answer» CO which is a major pollutant RESULTING from the combustion of fuels in automobiles plays a major ROLE in photochemical smog |
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| 6. |
Pick the odd one out |
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Answer» Graphite |
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| 7. |
Pick the electrophiles and nucleophiles from the following : (a) NH_(3) (b) NO_(2)^(+) (c) CN^(-) (d) RNH_(2) (e) SO_(3) (f) ROH (g) RO^(-) (h) FeCl_(3) |
| Answer» SOLUTION :ELECTROPHILES : `NO_(2)^(+), SO_(3), FeCl_(3)` | |
| 8. |
Pick the incorrect statement about the factors affecting ionization energy |
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Answer» More is the shielding of valence ELECTRONS more is the ionization energy |
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| 9. |
Pick the equation that gives you the relationship between molecular mass and density. |
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Answer» <P>`M=(dRT)/(P)` |
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| 10. |
Pick the acid odd out with respect to acid rain. H_(2) SO_(4) ,HCl, HNO_(3), H_(2)CO_(3), CH_(3)COOH, H_(2)SO_(4) |
| Answer» Solution :`CH_(3)COOH`- it is not present in ACID RAIN. | |
| 11. |
Pick out true statements (s) (i) q and w are path functions (ii) q + w is a state function |
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Answer» Only (i) |
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| 12. |
Pick out the wrong statement |
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Answer» SPHALERITE is ZINC sulphide |
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| 13. |
Pick out the pair of gases with the same rate of diffusion |
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Answer» `CO, NO` |
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| 14. |
Pick out the odd one out |
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Answer» Cyclotron |
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| 15. |
Pick out the molecule which possess diamagnetic behaviour. |
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Answer» `O_(2)` |
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| 16. |
Pick out the most stable carbonium ion |
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Answer» `C_(6)H_(5) - UNDERSET(underset(C_(6)H_(5))(|))OVERSET(+)(C )-C_(6)H_(5)` |
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| 17. |
Pick out the incorrect statement from the following. |
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Answer» `sp^(3)` hybrid orbitals are equivalent and are at an ANGLE of `109^(@), 28'` with eachother |
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| 18. |
Pick out the incorrect statement |
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Answer» Energy RELEASED PER GRAM is more is case of FUSION than in FISSION |
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| 19. |
Pick out the in-correct statement about "C" from the following for the following reaction scheme. H_3C - C -= CH overset(Na)to A overset(H_3C - Cl)to B + H_2 underset("passadised charcoal ")overset("partially deactivated") to C |
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Answer» The product C on reductive OZONOLYSIS gives only acetaldehyde |
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| 20. |
Pick out the error and write correct IUPAC name of pent-3-yne. |
| Answer» Solution :POSITION of triple bond, `CH_(3)CH_(2)C EQUIV C CH_(3)`. (Pent-2-yne) | |
| 21. |
Pick out the correct statements(s) of the following |
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Answer» All atoms with an odd ATOMIC number are necessarily PARAMAGNETIC. |
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| 22. |
Pick out the correct statement(s) from the following? |
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Answer» Nitration of nitroso benzene and nitrobenzene gives meta derivatives |
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| 23. |
Pick out the correct statement (s) |
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Answer» C.N. of an atom at a LATTICE point in SIMPLE cubic arrangement is 6 |
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| 24. |
Pick out the correct statement from the following: 1. Cobalt (III) is more stable in octahedral complexes. 2. Zinc forms coloured ions or complexes 3.Most of the d-block elements and their compounds are ferromagnetic. ltBrgt 4. Osmium shows (VIII) oxidation state 5. cobalt (II) is more stable in octahedral complexes. |
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Answer» 1 and 2 Os has maximum VIII oxidation state. |
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| 25. |
Pick out the correct statement from among the four: |
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Answer» When a LIQUID BOILS, work is done on the SYSTEM |
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| 26. |
Pick out the correct statement about CsCl structure |
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Answer» `CL^(-)` adopts a simple cubic lattice |
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| 27. |
Pick out the correct statement |
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Answer» Inner CORE of the EARTH is made up of ALMOST PURE solid iron |
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| 28. |
Pick out the correct relation for 1 mole of real gas. |
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Answer» `(P+(V)/(a^(2)))(V-b)=RT` |
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| 29. |
Pick out the correct order of acid strength . |
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Answer» `CH_3 -CH_2 - COOH GT CH_3 COOH gt CH_2 CL COOH` |
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| 30. |
Pick out the correct order of acid strength, |
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Answer» `CH_(3)-CH_(2)-COOH GT CH_(3)COOH gt CH_(2)CICOOH` |
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| 31. |
Pick out the alkane while differs from the other members of the group. |
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Answer» 2,2-dimethylpropane |
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| 32. |
Pick out th eunsaturated fatty acid from the following |
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Answer» STEARIC acid |
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| 33. |
Pick out te statement which is not relevant in the discussion of colloids |
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Answer» Sodium aluminium silicate is USED in the softening of hard water |
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| 34. |
Pick out incorrect statements |
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Answer» The volume of 0.1M `FeC_(2)O_(4)` solution required to reduce 200 ML of 0.6 M `K_(2)Cr_(2)O_(7)` in ACIDIC medium is 2400 ml `=200xx0.6xx6=720` No. of mec of `FeC_(2)O_(4)=720` `720=V` in `mlxx0.1xx3` `V=(720)/(0.2)=2400ml` b) `Vxx0.1xx2=250xx0.2xx2,V=500ml` c) `SO_(4)^(--)` Eqwt = `(96)/(2)=48` d) Molality is weight factor. Not influenced by temperature. |
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| 35. |
Pick out correct statement among the following about the equal volume of N_(2)(g) and O_(2)(g) at 298K and 1 atm: |
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Answer» The AVERAGE translational kinetic ENERGY per MOLECULE is same of `N_(2)(g)` and `O_(2)(g)` |
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| 36. |
Pick out correct statements regarding orystalline form of boran |
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Answer» All allotropic forms of boran contais is icosahedral units with boran ATOMS at all 12 corners. In `B_(12)` units each boran atom is bonded to 5 boron atoms `beta` rhombo hedral consists of 12 `B_(12)` icosahedral arrangement. |
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| 37. |
Pick out correct statements |
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Answer» One GRAM equivalent of oxygen at STP occupies 5.6 litres b) 1 Volume `H_(2)O_(2)=0.089 M` c) CORRECT statement d) Molecular formula `C_(6)H_(6)` |
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| 38. |
Pick out among the following, the form of silica different from the rest |
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Answer» Quartz |
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| 39. |
pi_(2px)^(**) differs from pi_(2py)^(**) molecular orbital in which of the following |
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Answer» NUMBER of PLANES |
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| 40. |
pi^(@) meson is exchanged between : |
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Answer» PROTON and neutron |
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| 41. |
Physical properties of water. |
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Answer» Solution :Water is a colourless and tasteless liquid. The unusual properties of water in the condensed phase (liquid and solid STATES) are DUE to the presence of extensive hydrogen bonding between water molecules. This leads to high freezing point, high boiling point, high heat of vaporisations and high heat of fusion in comparison to `H_2 S` and `H_2Se`. In comparison to other liquids, water has a higher specific heat, thermal conductivity, surface tension, DIPOLE moment and dielectric constant, etc. These properties allow water to play a key role in the biosphere. It is an excellent solvent for transportation of IONS and molecules required for plant and animal metabolism. Due to hydrogen bonding with polar molecules, even covalent compounds like ALCOHOL and carbohydrates dissolve in water. Physical properties of `H_2O` and `D_2O` ![]()
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| 42. |
…..physical proporty is changed by increase of molecular mass in homologous series |
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Answer» BOILING point |
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| 43. |
Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states ? |
| Answer» SOLUTION :Physical properties of ice, water and STEM differs because they are FOUND in different states. Ice is found in solid, water in LIQUID and steam in vapour states. Chemical composition of water in all the three states is same, i.e., `H_(2)O`. | |
| 44. |
Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states. |
| Answer» Solution :Chemical composition is same in all the three STATES, i.e., `H_(2)O`. | |
| 45. |
PhSO_2CH_2-CH_2-OMeunderset(EtOD) overset(EtO^(theta))to"product"+underset("(recovered reactant)")(PhSO_2-oversetoverset(D)(|)CH-CH_2OMe. The product is : |
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Answer» `PhSO_2CH=CH_2` |
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| 46. |
Photosynthesis utilizes ......... tons of CO_2 annually from atmosphere. |
| Answer» Solution :2200 crore | |
| 47. |
Photosynthesis involves the following overall reaction 6CO_(2)+6H_(2)O overset("sunlight")underset("chlorophyll")to C_(6)H_(12)O_(6)+6O_(2) Identify the species oxidised and the species reduced |
Answer» Solution :Photosynthesis involves a series of complex REACTIONS but the overall reaction involves reduction of `CO_(2) to C_(6)H_(12)O_(6)` and OXIDATION of `H_(2)O to O_(2)` as explained below
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| 48. |
Photosyntesis is a bio process by which planets make energy rich molecules from low energy molecules with the help of energy. From sunlight. The photosynthesis of glucose can be represented as : 6CO_(2)(g)+6H_(2)O(g)+hvrarrC_(6)H_(12)O(s)+60_(2)(g) Electrochemical oxidation of glucoses to CO_(2) and H_(2)O. which is the reverse of photosyhnthesis, is an impottaint reaction and it can be used in the construction of a fuel cell. In a fule cell, a working substance celled fule is electrochemiclly oxidised by O_(2) C_(6)H_(12)O_(6)+6HOrarr24_(e)^(-)+24H^(+)+6CO_(2) Heats of combustion of graphite and hydrogen at 300 K are -400 kJmol^(-1) respectively. If on combustion, 1 g of glucose releases 15 kJ of energy. calculate the heat of formation of glucose at 300 K. |
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Answer» `-450` KJ |
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| 49. |
Photosyntesis is a bio process by which planets make energy rich molecules from low energy molecules with the help of energy. From sunlight. The photosynthesis of glucose can be represented as : 6CO_(2)(g)+6H_(2)O(g)+hvrarrC_(6)H_(12)O(s)+60_(2)(g) Electrochemical oxidation of glucoses to CO_(2) and H_(2)O. which is the reverse of photosyhnthesis, is an impottaint reaction and it can be used in the construction of a fuel cell. In a fule cell, a working substance celled fule is electrochemiclly oxidised by O_(2) C_(6)H_(12)O_(6)+6HOrarr24_(e)^(-)+24H^(+)+6CO_(2) Calculate the approximate standard emf of this fuel cell at 27^(@)C if DeltaH^(@) and DeltaS^(@) of above photosynthesis reaction are -3xx10^(6)Jmol^(-1) and 200 JK^(-1)mol^(-1)respectively : |
| Answer» Answer :a | |
| 50. |
Photonof wavelength4xx 10^(7)strikes onmetalsurfacethe workfunctionof the metal being2.13 eVCalculate(i) Theenergyof the photonev(ii)The kineticenergyof theemissionand(iii) thevelocityof thephotoelectron . (1 eV = 1.6020 xx 10^(19) J ) |
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Answer» Solution :`1 EV= 1.6020 XX 10 ^(19)|` where `lambda = 4 xx 10^(7) m` `=(2.13 eVxx 1.6020 xx 10^(19)J)/( 1eV ) ` (i) Calculateof energyof photon `E=- (hc)/( lambda ) = (6.626 xx 10^(34)J s) (3.0 xx 10^(8)ms^(-1))/(4XX 10^(7) m)` (ii) Calculationof kineticenergyof emission Kineticenergyof emission= (photonenergyworkfunctionW ) `=(4.9695xx 10^(19) - 3.4123 xx 10^(19)J` (iii) Calculation ofvelocityof thephotoelectronkineticenergy`1.56 xx 10^(19) J` Kineticenergy`=(1)/(2) MV^(2)` `v^(2)= (2xx "kineticenergy")/( m )` `=sqrt((2xx1.56 xx 10^(19))/(9.1 xx 10^(31) kg ))` `= sqrt (0.3429 xx 10^(12) kg^(-1))` `=0.5855 xx 10^(6) ms^(-1) ` `5.855 xx 10^(5) ms^(-1)` |
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