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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. |
Name the acid whose salt is required to form propane |
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Answer» ium salt of butanoic ACID REQUIRED for the preparation of PROPANE. |
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| 2. |
Calculate the percent ionic character of HCl. Given that the observed dipole moment is 1.03D and the bond length of HCl is . Given esu. |
| Answer» E you TELLING?? | |
| 3. |
Calculate the molecular mass of the following: (i) (ii) (iii) |
| Answer» MIC mass of some of the elements as required by the question:H = 1 amu, O = 16 amu, C = 12 amuNow,( i ) Molecular mass of = ( 1 * 2 ) + 16Molecular mass of = 2 + 16Molecular mass of = 18 amu( ii ) Molecular mass of = 12 + ( 16 * 2 )Molecular mass of = 12 + 32Molecular mass of = 44 amu( III ) Molecular mass of = 12 + ( 1 * 4 )Molecular mass of = 12 + 4Molecular mass of = 16 amu | |
| 4. |
Calculate the oxidation number of sulphur, chromium and nitrogen in , and . Suggest structure of these three compounds. Count for the fallacy. |
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| 5. |
Calculate the number of moles in each of the following. (i) 392 g of sulphuric acid (ii) 44.8 litres of sulphur dioxide at N.T.P. (iii) 8g of calcium |
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Answer» Number of moles = Mass of SUBSTANCE / Mass of one mole.(i)4 mol(II)2 mol(iii)0.2 molExplanation:(i)molar mass of H2HSO4=98 g98 g H2HSO4=1 mol392 g of H2HSO4=(1 mol/98 g)*(392 g) = 4 mol(ii)22.4 L of S02 at NTP=1 mol44.8 L of S02 at NTP=(1 mol/22.4 L)*44.8 L) = 2.0 mol(iii)atomic mass of Ca=40 g40 g of CALCIUM=1 mol8 g of calcium=(1 mol)*(8g/40 g) =0.2 mol |
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| 6. |
Calculate the molality of 1M NaOH solution which has a density of 1.2 g/mL? |
| Answer» MARK as BRAIN listExplanation: | |
| 7. |
What is hydration enthalpy and how does it depend upon size? |
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Answer» ₹₹Hope HELP you₹₹₹₹₹₹₹₹₹>>>>>>>>>>>>>>If the hydration enthalpy is equal to or GREATER than the lattice enthalpy, then the salt is water SOLUBLE. Factors on whichHydration enthalpy depends : 1)size of CATIONS and anions : As the atomic numbers increases, ionic size also increases, leading to a DECREASE in absolute values of enthalpy of hydration. |
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| 8. |
C and Si are almost always tetravalent but Ge, Sn and Pb show bivalency. Why? |
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Answer» ),Ge, SN, and Pb are all elements that BELONG to the p block of the periodic table. They have an electronic configuration of the elements is ns²p². ... Therefore, the elements with large atomic NUMBERS are divalent and C and SI are TETRAVALENT. |
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| 9. |
Bond angle in NH₃ is more than that in case of PH₃ molecule. Explain. |
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Answer» there are 4 electron pairs (3 bonding pairs & 1 lone PAIR) in the outer most shell of N. The repulsion between lone pair and a bond pair of electrons always exceeds to that of two bond pairs. Thus the bond angles are reduced from 109.27' to 107.48'.Considering that PH3 would be EXPECTED to be similar. But, the bond pairs of electrons are MUCH further away from the central atom due to its larger size than they are in NH3. Thus the lone pair causes even greater distortion in PH3. So the bond ANGLE decrease to 91.18'Thus, the bond angle of PH3 molecule is lesser than that in NH3 molecule.Hope it helps. |
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| 10. |
Fdfseetufibgigtkgtkouijyulyybmghhcfgbjjvjhggcgzgkkyxyxxhrchghyghcjuhyfbm |
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| 11. |
What is hydration enthalpy & how does it depend upon the size of element? |
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Answer» @((((((HOPE HELP YOU)))))))@@@@@@@@@@@@@@@@@If the hydration enthalpy is equal to or greater than the lattice enthalpy, then the salt is water soluble. Factors on whichHydration enthalpy depends : 1)size of CATIONS and anions : As the atomic NUMBERS increases, ionic size ALSO increases, leading to a decrease in absolute VALUES of enthalpy of hydration |
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| 12. |
At 340 K, Kp for the reaction is 0.8 atm. Calculate the percent dissociation of at 340 K and a total pressure of 1 atmosphere. |
| Answer» CORRECT option isA50% N 2 O 4 →2NO 2 At eqm 1-x 2×xK P =(2x/1+x) 2 ×(380/760) 2 /(1−x/1+x)×(380/760)=0.667.x=0.5.So 50% DISSOCIATION happens. | |
| 13. |
At 1000K, the value of for the reaction is 20R, then find . |
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Answer» bbsbsbsbebevbebe |
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| 14. |
Arrange X-rays, cosmic rays and radio waves according to frequency. |
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Answer» osmic>RADIO but i INSIST you to CHECK answer. I MIGHT BE WRONG |
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| 15. |
Arrange the oxides in order of increasing acidic character; , BeO, , . Give reason for your answer. |
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Answer» sgfshfdngdmgdngdngsngsnfsbfabfshtsjtsjgd |
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| 16. |
Arrange the following species in order of increasing stability: , , . |
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Answer» sngsngsgsgnsjysjydkhdmgsnfskg |
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| 17. |
Arrange the following: HCl, HBr, HI, HF in order of decreasing reactivity towards alkenes. |
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| 18. |
Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, . (a) Chlorobenzene, 2,4–dinitrochlorobenzene, p–nitrochlorobenzene (b) Toluene, p – – – , p – – – |
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Answer» bsolutely CORRECT |
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| 19. |
Arrange the following: , , , in order of increasing stability. |
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| 20. |
Arrange the following in the decreasing order of property indicated: (i) F, Cl, Br and I (electron affinity) (ii) Mg, Al, Si and Na (ionization energy) (iii) C, N, O and F (second ionization energy) |
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| 21. |
Arrange the bonds in order of increasing ionic character in the molecules : LiF, , , and . |
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Answer» mhxmhcmhzmg,kydkydkyskyskyskysktsjy |
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| 22. |
Arrange the following in decreasing order of their bond angle : , , . |
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Answer» dkdjfkyddduysiydiyeieeiuedujsjyjfjfjhhshsd |
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| 23. |
Arrange the anions in order of increasing radius; , , , . Give reason for your answer. |
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Answer» dsvhshshshhsfgsgs |
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| 24. |
Arrange , and in the decreasing order of their boiling points. |
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Answer» gdktdkgdkydjydtskyszkhxkjtsdkkdkckydkgdk |
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| 25. |
Ana and Isha , two students of class XIth were discussing about the allotropes of carbon. Ana asked Isha , why one allotrope of carbon is very hard and use to make jewellery whereas other is very soft and used to make pencils. Isha explained her that this is due to difference in their molecular structure. (i) Name the above two allotropes of carbon. (ii) Why one allotrope is conductor and other is not? (iii) What values are associated with Isha? |
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Answer» ond is the HARD allotrope o carbon and is used in making JEWELLERY. Graphite is the soft allotrope of Carbon and is used in pencils.ii)Graphite is a good conductor of electricity as therever is 1 valance electron left in each carbon atom. While in DIAMOND the atoms are ARRANGED tetrahedra ALLY. Hence there are no free electrons to conduct electricity.iii)idk |
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| 26. |
Arrange in order of increasing dipole moment: , , . |
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Answer» jjgdmfjgdhddjdjjeueegduzjjskgsdsseiidd |
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| 27. |
Name any element which had a capacity to bear 8000 degree Celsius |
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Answer» s no ELEMENT which can bear a capacity of 8000 degree Celsius as TUNGSTEN is a metal which have highest MELTING point of all the element (3,414 °C) |
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| 28. |
Among (the non-radioactive) halogens the element that has the lowest electron affinity is .................... |
| Answer» INE i THINK so | |
| 29. |
Aluminium vessels should not be cleaned with cleansing agent containing washing soda. Explain. |
| Answer» NG soda is expensiveB washing soda is easily decomposedC washing soda REACTS with ALUMINIUM to form soluble aluminateD washing soda reacts with aluminium to form insoluble aluminium oxide | |
| 30. |
determine the rate of reaction between potasium iodate (klo3) and soqium sulphite (na2so3) with the use of starch indicator |
| Answer» N between Potassium IODATE (KIO3) and Sodium SULPHITE (Na2SO3) Reaction of KIO3 and Na2SO3 is depend UPON the reaction of these two reactants.In this process sodium sulphite will act as a reducing agent to REDUCE potassium iodate to iodide .while using starch to test this reaction you realise that starch changes colour to blue colour . | |
| 31. |
Name the products obtained after the electrolysis of aqueous sodium chloride |
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Answer» cathode (C), water is reduced to hydroxide and hydrogen gas. The NET process is the electrolysis of an aqueous solution of NaCl into industrially useful products SODIUM hydroxide (NaOH) and Chlorine gas(CL).Hope it HELPS:) |
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| 32. |
All Bronsted bases are also Lewis bases but all Lewis acids are not Bronsted acids. Justify. |
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Answer» acid can accept an ELECTRON PAIR and form a bond. A Brønsted-Lowry acid can GIVE up a PROTON which does exactly that, and thus every Brønsted-Lowry acid fits the definition of a Lewis acid. As you noted in the QUESTION, every Brønsted-Lowry baseis also a Lewis base, but the reverse isnot true. |
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| 33. |
Alkaline earth metal ions have a tendency to form complexes, whereas it is not so in case of alkali metals. |
| Answer» DY HERE IS UR ANSWER !!!!¤ Complexes of the Alkaline Earth Metals. Because of their higher positive charge (+2) and smaller ionic radii, the alkaline earth metals have a much greater tendency to FORM complexes with LEWIS bases than do the ALKALI metals.Hope u like !!》》 BE BRAINLY 《《 | |
| 34. |
Identify the compound in which phosphorus exists in the oxidation state of +1. |
| Answer» H3PO2.............. | |
| 35. |
'Aluminium metal melts at 660 degree celsius and burns in oxygen to form aluminium oxide'. Identify the physical and chemical properties and changes that can be concluded from the above statement? |
| Answer» END..Here is your answer..The physical properties are :-1. Aluminium has HIGHT melting point2.Aluminium does not easily REACT with airThe CHEMICAL properties are:-1.There is oxidation of Al here2.Al element react with O2 and FORM aluminium oxide which is a compound.HOPE that it will help you.... | |
| 36. |
A thermometer is dipped in a dish containing ether and the reading is recorded. After few minutes the volume of ether decreases. Will the temperature shown by the thermometer will be more or less than the initial reading. |
| Answer» PERATURE will decrease as volume is DIRECTLY proportional to temperatureI hope this HELPS you | |
| 37. |
A signature written in carbon pencil weighs 1 mg. Determine the number of carbon atoms present in the signature. |
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Answer» s is the ANSWER |
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| 38. |
A small amount of phosphoric acid or glycerol or acetanilide is added in during its storage. Explain. |
| Answer» KNOW ⌚3syryudueudhfhchfhxhskskdmx | |
| 39. |
A gas occupying a volume of 100 litres is at 20°C under a pressure of 2 bar. What temperature will it have when it is placed in an evacuated chamber of volume 175 litres ? The pressure of the gas in the chamber is one-third of its initial pressure? |
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Answer» p100/n293=p175/3*N*T4/293=7/3TT=293*7/12T=24.41*7=170.87Kelvin |
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| 40. |
A compound (A) of boron reacts with to give an adduct (B) which on hydrolysis gives a compound (C) and hydrogen gas. Compound (C) is an acid. Identify the compounds A, B and C. Give the reactions involved. |
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Answer» write a letter to your FRIEND INFORMING him about your SHORT visit to his place and what you propose propose to do thereExplanation:write a letter to your friend informing him about your short visit to his place and what you propose propose to do there |
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| 41. |
Reaction of chloroform with acetone ?☺ |
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Answer» ll be the ANSWER of this QUESTION the REACTION of CHLOROFORM with ACETONE not |
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| 42. |
What are the inferences when copper carbonated is heated |
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Answer» hich GUY turns lime WATER milky is released, gas is probably CARBON DIOXIDE |
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| 43. |
A botany student Riya saw a beautiful lake in a village during a school trip. Riya noticed that around the lake villagers washing their clothes and at the same time wastes from houses was destroying the lake beauty. She visited there again after few years and was surprised to find that the lake was covered with algae, stinking smell. (i) What is the reason for this condition of the lake? (ii) What will be the effect of this condition on animal kingdom? (iii) What values are associated with Riya? |
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Answer» tere pair di jhanjhar nee pukare ranjhan ranjhan nee ik vaari takk LENDE SOHNIYE hje naa jaa ! mitran NU tak lende heeriye hje NA jaa |
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| 44. |
Draw structure of a. N-pentane b. Iso butane c. Cyclo pentane |
| Answer» | |
| 45. |
500 cc of 0.250 M solution added to an aqueous solution of 15.00 g of . How many moles and how many grams of are formed? (Mol. wt. Of = 233, and = 208) |
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Answer» kydkhdkhhxmhhhhchhhhhjhjff |
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| 46. |
TRUE OR FALSE- The red colour used during rangpanchami contain high proportion of lead |
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Answer» e it HELPS u. pls MARK my ANS. the BRAINLIEST |
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| 47. |
Explain why fermentation process is used in manufacture of ethanol? why is it necessary to carry out this process in the absence of air?NO SPAMMING PLS!! |
| Answer» END..Here is your answer..Ethanol fermentation is the ANAEROBIC process carried out by yeasts in which simple sugars are converted to ethanol and carbon DIOXIDE. Fermentation makes it possible for cells to continue generating ATP through glycolysis. Lactic acid is a BYPRODUCT of fermentation. The bacteria carry out lactic acid fermentation in the ABSENCE of oxygen.HOPE that it will help you | |
| 48. |
State 4 reasons why water is a compound |
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Answer» asons why WATER is a COMPOUND:-1. all compound are molecules but not all molecules are compounds 2. water is a molecule because It is made from atoms that have been chemically combined 3. It is also a compound because the atoms that make water are not all the same4. the atoms of HYDROGEN and OXYGEN combined with each other to form waterHope it helps:) |
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| 49. |
3.65 gm HCl gas is present in 100 ml of its aqueous solution. What is the molarity of solution? |
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Answer» y=moles/volume in LITRES= 3.65/36.5×1000/100=0.1×10=1 M. |
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| 50. |
Why shearing doesn't hurt the sheep ?what is meant by shearing |
| Answer» E here's ur anscutting or shaving the wool of a sheep is called shearing. Shearing doesn't USUALLY hurt a sheep. It's just like getting a hair cut. HOWEVER, shearing requires skill so that the sheep is shorn efficiently and quickly without causing cuts or INJURY to the sheep or shearerplease mark as brainliest | |