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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. |
Atomic no. Of Silicon |
| Answer» 14 | |
| 2. |
Define Wurtz Reaction |
| Answer» An alkyl halide on reaction with sodium in the presence of dry ether to produce a symmetrical alkane having double the number of carbon atoms present in haloalkane. | |
| 3. |
Why we use silicon nipples in baby feeding bottle |
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Answer» Sorry ate* are Because silicon nipples ate firmer and more durable then other nipples types since it is firmer they provide a good solid latch on your baby mouth and coupled with a wide base and they can mimic as a mother\'s breasts |
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| 4. |
What is the importance of measuring BOD of water body? |
| Answer» | |
| 5. |
Inductive effects |
| Answer» The displacement of sigma electron along a saturated C-chain. Whenever,an electron withdrawing group or electron donating group is present at the end of C-chain is called inductive effect.They are of two types - 1___ +I effect 2___ - I effect | |
| 6. |
What is London force |
| Answer» London force or dispersion force is a force acting between atoms and molecules. | |
| 7. |
H2o is hydride or oxidw |
| Answer» [email\xa0protected] rocks | |
| 8. |
What is global warming in easy words? |
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Answer» Rise in temp of earth. Destroying ozone layer |
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| 9. |
The wave numberof electromagnetic radiation emitted during the transition of electron in between two levels of Li^(2+) ion whose principal quantum number is 4 and difference is 2 is : |
| Answer» ANSWER :2 | |
| 10. |
Which of the following electronic configuration does not be belongs to same block as others |
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Answer» `[Xe]4f^(14)5D^(10)6S^(2)` |
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| 11. |
The set of reagents that needed to carry out the following conversion are CH_(3)-CH_(2)-C-=CHtoCH_(3)-CH_(2)-CH_(2)-CHO |
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Answer» `H_(2)O //HgSO_(4)//H_(2)SO_(4)` |
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| 12. |
To 20 mL of a copper solution after necessary treatment were added excess of KI and the liberated iodine required 11.2 mL decinormal solution of hypo. Express the strength of the original solution in grams of copper per litre of the solution. |
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Answer» |
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| 14. |
Which one of the following alkenes when treated with HCI yields majorly an anti-Markownikoff product: 1.CH_3O - CH = CH_2 2.H_2N - CH = CH_2 3.F_3C - CH =CH_2 4.Cl - CH = CH_2 |
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Answer» `CH_3O - CH = CH_2` |
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| 15. |
Which of the following reagents is useful in separating benzoic acid from phenol ? |
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Answer» Dil. HCl |
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| 16. |
Which of thefollowingis the correct order of size of thegiven species : |
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Answer» `I GT I^(-) gt I^(+)` |
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| 17. |
There is a K_a(1) and K_2(2) of sulphuric acid and H_2SO_3 are 1.7 xx 10^(-2) and 6.4 xx 10^(-8) respectively then calculate ionization constant of complete ionization of H_2SO_3. |
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Answer» SOLUTION :`K_a=K_a(1)xxK_a(2)` `=(1.7xx10^(-2))(6.4xx10^(-8))` `=1.088xx10^(-9)` |
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| 18. |
The two extra -nuclear electrons in the orbital of helium have antiparallel spins (uarrdarr). Why not they have parallel spins (uarr uarr) ? |
| Answer» Solution :If they had PARALLEL spins, the repulsion will increase. As a RESULT, energy will increase and the STABILITY will DECREASE. | |
| 19. |
whatis the differencebetween2p and 2s ? |
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Answer» Solution :for2p L = 1AND`m_(i)=+1,0 + 1` threedegenerateorbitals Energyof `2S lt2p` 2s issphericalorbital andit has onenodalplansL 2SIS dumbell shapedorbital it doesnotpossesradialnode. |
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| 20. |
Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be : |
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Answer» ZERO |
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| 21. |
Which of the following alcohols is expected to have a highest boiling point ? |
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Answer» n-Butanol |
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| 22. |
Write structure of Hydrogen peroxide. |
Answer» SOLUTION :HYDROGEN PEROXIDE has a non-planar structure.  (a) `H_2O_2` structure in GAS PHASE, dihedral angle is `111.5^@`. (b) `H_2O_2` structure in solid phase at 110 K, dihedral angle is `90.2^@`. |
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| 23. |
What is the following when Ne gas pass through this vessel ? N_2O_(4(g)) hArr 2NO_(2(g)) (Red) |
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Answer» RED COLOR become dark. |
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| 24. |
The solubility product of a sparingly soluble metal hydroxide M (OH)_(2) at 298 K is 5xx10^(-16)"mol"^(3)"dm"^(-9). The pH value of its queous and saturated solution is |
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Answer» 5 `K_(sp)=(s) (2s)^(2)=4S^(3)` `s^(3)=(K_(sp))/(4)=(5xx10^(-16))/(4)=1.25xx10^(-16)` `=125xx10^(-18)` `:. S=5xx10^(-6)M, i.e., [OH^(-)]2xx5xx10^(-6)M` `=10^(-5)M` pOH = 5.0 pH=14-5 = 9 |
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| 25. |
When a solid containing 10 N^@ molecules is allowed to melt, then |
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Answer» Only one MOLECULE of a solid melts |
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| 26. |
Two different gases .A. and .B. are filled in separate containers of equal capacity under tha same conditions of temperature and pressure. On increasing the pressure slightly the gas .A. liquefies but gas B does not liquefy even on applying high pressure until it is cooled. Explain this phenomenon. |
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Answer» Solution :The temp. at which a gas cannot be liquefied howsoever high pressure MAY be applied on the gas is called CRITICAL temperature. Thus, gas A. liquefies easily, this SUGGESTS gas .A. is below its critical temperature. On the other hand, gas .B. does not liquefy easily even on applying high pressure. This suggests that gas .B. is above its critical temperature. |
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| 27. |
When glycerol is heated with oxalic acid at 503 K the product formed is |
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Answer» ALLYL alcohol |
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| 28. |
Which is the possible oxidation state in the different compounds of Nitrogen ? |
| Answer» Answer :A | |
| 29. |
What happens when acetyl chloride is treated with excess of CH_(3)MgI ? |
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Answer» Solution :When acetyl chloride is treated with excess off `CH_(3)MGI`, tertiary ALCOHOLS are formed. `CH_(3)COCl+CH_(3)MgI(excess) to underset("t-Butyl ALCOHOL")(CH_(3)-underset(CH_(3))underset(|)OVERSET(OH)overset(|)(C)-CH_(3))` |
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| 30. |
What is the maximum number of electrons that can be associated with the |
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Answer» 4 either`3p_x` or `3p_3` |
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| 31. |
Which of the following pairs of substance on reaction will not evolve H_(2) gas ? |
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Answer» `Fe and H_(2)SO_(4)` (aqueous) |
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| 32. |
The weight of 600 ml of a mixture of ozone and oxygen is 1 gm at STP. The volume of oxygen in the mixture is |
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Answer» 200 ML `"volume"_("STP")=(1)/(M)xx22400=600impliesM=(112)/(3)` If moles of `O_(2)=X % O_(3)=y` then `M=(32x+48y)/(x+y)=(112)/(3)` `IMPLIES 96x+144y=112x+112y` `(x)/(y)=(1)/(2)` `therefore V_(O_(2))=(1)/(3)xx600=200mL` |
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| 33. |
Threemolecules of acetylene undergoes polymerisatino to give ……………………. |
| Answer» SOLUTION :BENZENE | |
| 34. |
Whichof the followingpairof elementsdo NOTshowdiagonalrelationship? |
| Answer» Answer :D | |
| 35. |
Whatare._(17)^(35) Cl and._(17)^(37) Cl ? Why |
| Answer» SOLUTION :Theyare ISOTOPS of eachotherbecause(i) Theiratomicnumberaresameis 17 but(ii) thereatomicmassaredifferenceie 35 and37 . | |
| 36. |
Which laws can be used to predict whether a particle reaction is feasible or not under a given set of conditions ? |
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Answer» CHEMICAL Kinetics |
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| 37. |
Troposphere is made of turbulent, dusty zone containing air, much water vapour and clouds. |
| Answer» Solution :Stratosphere contains dinitrogen, DIOXYGEN, OZONE and little WATER VAPOUR. | |
| 38. |
Which of the following substitution reaction of alkane is reversible ? |
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Answer» Fluorination |
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| 39. |
The value of bond enthalpy of H_(2) , CI_(2) and HCI are 104, 58 and 103 kilogram respectively. Than find the enthalpy of formation of HCI_((g)). reaction:(1)/(2) H_(2(g)) + (1)/(2) CI_(2(g)) to HCI_((g)) |
| Answer» SOLUTION :`-22` kj/mol | |
| 40. |
What is called elastic collision ? |
| Answer» SOLUTION :This means that TOTAL ENERGY of molecules before and after the COLLISION remains same. There may be exchange of energy between colliding molecules. | |
| 41. |
What is the temperature and pressure in a thermos flask ? |
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Answer» 298 K, 1 atm |
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| 42. |
Which of the following groups cannot participate in resonance with benzene : |
| Answer» Answer :C | |
| 43. |
What is the relation between K_p and K_C. Give one example for which K_p is equal to K_C. |
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Answer» Solution :The relation between `K_P and K_C " is " K_P = K_C(RT)^(Deltan_g)` `K_P`= equilibrium constant is terms of partial pressure. `K_C` = equilibrium constant is terms of CONCENTRATION. R = gas constant T = Temperature `Deltan_(g)`= DIFFERENCE between the sum of the number of MOLES of products and the sumof number of moles of reactats in the gas phase. When `Deltan_g = 0` `K_P = K_C(RT)^0 = K_C" i.c., " K_P = K_C` Example : `H_2(g)+ I_2(g)hArr 2HI(g) ` `Deltan_g = 2-2=0` `:.K_P = K_C` for the SYNTHESIS of HI. |
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| 44. |
Which of the following are chiral and capable of existing as enantiomers? a.1-3- Dibromobutane b. 1,2-Dichloropropane c. 1,5- Dibromopentane c. 3- Ethylpentane e. 2-Chlorobicyclo [1.1.0] butane f. 2- Iodobicyclo [2.2.2] octane g. 2-Bromobicyclo [2.1.1] hexane h.5- Bromobicyclo [2.1.1] hexane |
| Answer» SOLUTION :(a),(B),(F), and (G) only | |
| 46. |
Wrong statements regarding 'Classical smog is |
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Answer» Observed in winter SEASON |
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| 47. |
Which of the following reactions is not used in preparation of deuterium compounds using heavy water? |
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Answer» `CaC_(2) + 2D_(2)O to C_(2)D_(2) + CA(OD)_(2)` |
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| 48. |
Which among the following is acts as reducing agent ? |
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Answer» GACL `GA^(+)to Ga^(+3), 2e^(-), In^(+)rarr +2e^(-)` |
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| 49. |
Write the salient features of hybridisation. S |
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Answer» Solution :The SALIENT feaures of hybridization are : 2 The orbitals taking part in hybridization must have only a small difference in energy. 3 The number of hybrid orbitals is thesame number of ATOMIC orbitals that undergo hybridization 4Both half FILLED completely filled orbitals take part in hybridization 5 hybride orbitals form more STABLE bonds. |
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| 50. |
What is the de Broglie wave lenght of an electron, which is accelerated from the rest, through a potential difference of 100 V? |
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Answer» SOLUTION :POTENTIAL difference = 100 V `=100xx1.6xx10^(-19)J` `lamda=(H)/(sqrt(2mev))` `=(6.626xx10^(-34)KGM^(2)s^(-1))/(sqrt(2xx9.1xx10^(-31)kgxx100xx1.6xx10^(-19)J))` `lamda=1.22xx10^(10)m` |
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