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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. |
Calculate the equvalint mass of KMno4 |
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Answer» on state of MN in KMNO4 is 7 In acidic medium oxidation state of Mn is 2 hence EQUIVALENT weight is 158/5In NEUTRAL medium oxidation state of Mn is 4 hence equivalent weight is 158/3In BASIC medium oxidation state of Mn is 6 hence equivalent weight is 158/1Hence it varies according to the medium |
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| 2. |
6. Which of the following has maximum ionisation potential? (A) AL(B) P(C) Si(D) Mg |
| Answer» SI is the CORRECT ANSWEREXPLANATION:please Mark as BRAINLIST ♥️ | |
| 3. |
State and explain maxwells right hand thumb rule |
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Answer» Maxwell's right-hand thumb RULE INDICATES the direction of magnetic field if the direction of CURRENT is known. ... When thumb points upwards, the curled fingers are ANTICLOCKWISE. So, the direction of magnetic field is anticlockwise. When thumb points downwards, the curled fingers are clockwise. |
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| 5. |
The temperature at the centre of cylinder 3 minutes after the operation of change in Time required to attain a temperature of 350°C.pe 4.26. A copper cylinder (a.tally at a uniform temperature of 20°C. When the cylinder is exposed to hot flue gases,ar temperature suddenly increases to 480°C. Calculate := 1.12 x 10m2/s), 600 mm in diameter and 750 mm inmarimunsurface temperature;me the cylinder as semi-infinite solid.OOO |
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Answer» wonder if it is possible to have a VOCs combustion/removal powered with electricity instead of natural gas. As of now, the gas is used for BURNING VOCs from flue gas of a paint shop, but I would like to get rid of natural gas from the process. Is it possible to power the combustion chamber e.g. with electricity? Perhaps electric arc furnace? Or to remove VOCs in other way, powered by electricity?RELEVANT answerDudley J BentonSep 4, 2020AnswerThe simple answer is, yes, you can do it; however, burning natural gas enhances the effectiveness without consuming an excessive amount of energy and can also have lower OVERALL, long-term maintenance cost and EFFORT, which is why it is often done that way.View |
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| 6. |
The gas which gives a black precipitate when bubbled into nickel sulphatesolution |
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Answer» HydrogenHope it HELPS you ❤️! |
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| 7. |
What is fullerene??? |
| Answer» TION:ғᴜʟʟᴇʀᴇɴᴇ ɪs ᴛʜᴇ ᴍᴏsᴛ ʀᴇᴄᴇɴᴛʟʏ ᴅɪsᴄᴏᴠᴇʀᴇᴅ ᴄʀʏsᴛᴀʟʟɪɴᴇ ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ. ᴛʜɪs ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ ᴡᴀs ᴅɪsᴄᴏᴠᴇʀᴇᴅ ɪɴ 1985 ʙʏ ᴛʜʀᴇᴇ sᴄɪᴇɴᴛɪsᴛs, ʜ. ᴡ. ᴋʀᴏᴛᴏ, ʀ. ғ. ᴄᴜʀʟ ᴀɴᴅ ʀ. ᴇ. sᴍᴀʟʟᴇʏ. ᴛʜᴇʏ ᴡᴇʀᴇ ᴀᴡᴀʀᴅᴇᴅ ᴛʜᴇ ɴᴏʙᴇʟ ᴘʀɪᴢᴇ ғᴏʀʙᴄʜᴇᴍɪsᴛʀʏ ɪɴ 1996 ғᴏʀ ᴛʜɪs ᴅɪsᴄᴏᴠᴇʀʏ. | |
| 8. |
1. Aquifers c a inflow and storageStock of cbCb rainfall2.water3Escesse se droughtwateyLess water e la floods. |
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Answer» ,gmiegivadz EQUALITARIAN an azkag |
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| 9. |
Calciumtetrachloride atomic |
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Answer» CaCl³=11444+(35×2)=115 |
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| 10. |
can a water molecules H2O be prepared by combining 1 hydrogen atom with 1 oxygen atom? give a reason for your answer. |
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Answer» When molecular HYDROGEN (H2) and oxygen (O2) are combined and allowed to react TOGETHER, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide. These two processes are represented by the two chemical equations shown at right. CHEMISTS use re dox half-reactions to describe thermodynamic processes LIKE the ones embodied by such equations. For both of the reactions shown, the hydrogen molecules are o xidized and the oxygen atoms are reduced. Accordingly, each of the reactions below is described by a combination of two half-reactions--one corresponding to a chemical oxidation and another corresponding to a reduction. |
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| 11. |
9.8 g of H2SO4 is dissolved in enough water to make 500 mL of solution. The molarity of H+ and so ion in the solution respectively are ?(Assume 100% ionisation of H2SO4, molar massof H2SO4 = 98 g mol-1 |
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Answer» Molarity of H 2 SO 4 = 98×5009.8×1000 =0.2MAs H 2 SO 4 is strong ACID so it dissociates COMPLETELY to GIVE H + ions.H 2 SO 4 →2H + +SO 42− 0.2 0.2×2 0.2[H + ]=2×0.2=0.4MpH=−log([H + ])=0.3979Explanation:HERE IS YOUR ANSWER MARK AS BRAINLIEST |
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| 13. |
Write the combined gas equation |
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Answer» these 3 are UR answersExplanation:HOPE it will HELP youplease follow me and MAKE me BRAINLIST |
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| 14. |
A mixture of 10 L of butane and propane was subjected to combustion and total volume of CO2 evolved was equal to 35 L. The volume of propane in litres in the mixture is Answer: |
| Answer» CO 2 (3×3=9)Butane-C 4 H 1 0+65O 2 →4CO 2 +5H 2 O3 liters of butane WOULD produce 12 liters of CO 2 ($$3\times 4 = 12$$)Liters of propane = XLiters of butane = YX+Y=33X+4Y=10Solve 2 simultaneous equations to get-Y = 12 MOLE propane and 1 mole butane.So the ratio is 2:1.Explanation:HERE IS YOUR ANSWER PLEASE MARK ME BRAINLIEST | |
| 15. |
Identity the correct chemical name of feso3 sulphate furious sulphide furious sulphite furious |
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Answer» feso3 ⇒ SULPHATE furiousExplanation: |
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| 16. |
1 kg of water calculate mol |
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Answer» onvert the MASS in KG to G ( 1kg=1000g). Now 18g of H20 is equivalent to 1 mole. Hence, 1000g of it would be EQUAL to 1000/18 moles. This comes out be 55.55 moles. |
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| 17. |
Calculate formula mass of sodium carbonate ( Na2CO3.10H20 ) |
| Answer» HENCE, The UNIT of MASS is 286 GRAMS. | |
| 18. |
What is retention and inversion of configuration?Explain with suitable example. |
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Answer» Explanation: When the CONFIGURATION of both the reactant and PRODUCT is same, the product is SAID to have RETAINED the configuration. ... When the formed product has different configuration than that of the reactant, the product is said to have the INVERTED configuration. |
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| 19. |
(କ) ୨ ସମାନ ଭାଗ କର, (ଗ) ୪ ସମାନ ଭାଗ କର, ।(ଖ) ୩ ସମାନ ଭାଗ କର,(ଘ) ୬ ସମାନ ଭାଗ କର,(ଡି) ୮ ସମାନ ଭାଗ କର, |
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| 20. |
Calculate the molarity ofAmmonium chloride (NH4CL)if dissolve 30g in 500 cm of solution |
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Answer» Here is your ANSWER................... |
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| 22. |
Describe briefly what is fullerenes |
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Answer» ғᴜʟʟᴇʀᴇɴᴇ ɪs ᴛʜᴇ ᴍᴏsᴛ ʀᴇᴄᴇɴᴛʟʏ ᴅɪsᴄᴏᴠᴇʀᴇᴅ ᴄʀʏsᴛᴀʟʟɪɴᴇ ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ. ᴛʜɪs ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ ᴡᴀs ᴅɪsᴄᴏᴠᴇʀᴇᴅ ɪɴ 1985 ʙʏ ᴛʜʀᴇᴇ sᴄɪᴇɴᴛɪsᴛs, ʜ. ᴡ. ᴋʀᴏᴛᴏ, ʀ. ғ. ᴄᴜʀʟ ᴀɴᴅ ʀ. ᴇ. sᴍᴀʟʟᴇʏ. ᴛʜᴇʏ ᴡᴇʀᴇ ᴀᴡᴀʀᴅᴇᴅ ᴛʜᴇ ɴᴏʙᴇʟ ᴘʀɪᴢᴇ ғᴏʀʙᴄʜᴇᴍɪsᴛʀʏ ɪɴ 1996 ғᴏʀ ᴛʜɪs ᴅɪsᴄᴏᴠᴇʀʏ. |
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| 23. |
Under what condition of temperature and pressure gases shows ideal behavior |
| Answer» GAS should most SOLUBLE in WATER..... | |
| 24. |
27. The electrons present in the outermost shell are called (a) Valency electrons (b) Octate electrons (c) Duplet electrons (d) Valence electrons28. An alpha particle contains (a) 4 positive charge and 2 mass unit (b) 2 positive charge and 4 mass unit (c) 2 positive charge and 2 mass unit (d) 4 positive charge and 4 mass unit 29. The atomic number of sodium is 11 and its mass number is 23. It has (a) 11 neutrons and 12 protons (b) 12 protons and 11 electrons (c) 11 electrons and 12 neutrons (d) 12 electrons and 11 neutrons 30. The electronic configuration of chlorine is (a) 2,7 (b) 2,8,8,7 (c) 2,8,7 (d) 2,7,831. The isotope used to remove the brain tumours and treatment of cancer is (a) U-235 (b) Na-24 (c) Iodine (d) C0-6032. In an alpha scattering experiment, few alpha particles rebounded because (a) Most of the space in the atom is occupied (b) Positive charge of the atoms very little space (c) The mass of the atom is concentrated in the centre (d) All the positive charge and mass of the atom is concentrated in small volume33. The atomicity of K2Cr2O7 is (a) 9 (b) 11 (c) 10 (d) 12 34. The formula for quicklime is (a) CaCl2 (b) CaCo3 (c) Ca(OH)2 (d) CaO35. The symbol of cadmium is (a) Ca (b) Cu (c) Cm (d) Cd36. All noble gas molecules are (a) Monoatomic (b) Diatomic (c) Triatomic (d) Both I and II37. The formula of ethanol is C2H5 – OH. What will be its molecular mass? (a) 46 u (b) 34 u (c) 34 g (d) 46 g38. Number of moles present in 28g of nitrogen atoms are (a) 1 mole (b) 2.3 moles (c) 0.5 mole (d) 2 moles39. The molecular mass of x is 106. x can be (a) CaCO3 (b) SO3 (c) Na2CO3 (d) NaCl40. Which of the following is a wrong Combination? (a) 6.022 Χ 1023 molecules of oxygen = 32g of oxygen (b) 6.022 Χ 1023 ions of sodium = 23g of sodium (c) 6.022 Χ 1023atoms of C = 24g of carbon (d) 6.022 Χ 1023 atoms of H = 1g of hydrogen atoms41. What property of an element determines its chemical behaviour? (a) Size of an element (b) Valency of an element (c) Molar mass of the element (d) None of thes |
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Answer» tion:27)a. valence electrons28)b.2 POSITIVE CHARGE and 4 mass units.28)a.11 neutrons and 12 protons.30)C.2,8,731)d.co-6032)d.All the positive charge and mass of the atom is concentrated in small volume.33)b.1134)d.Cao35)d.Cd36)a.monoatomic37)d.46g38)d.2moles39)c.Na2co340)(c) 6.022 Χ 1023atoms of C = 24G of carbon41)(b) valence of the elementPlease mark my answer BRAINLIEST |
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| 25. |
Ok................... |
| Answer» OK........................ | |
| 26. |
Calculate the massof 2moles of sodium |
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Answer» 2 moles (n) has been given to you. The next STEP is to find the molar MASS (M) of Na. If you REFER to your periodic table, the molar mass of Na (sodium) is 23.0 g/mol. Now you have to find the mass (m).Explanation: PLZ FOLLOW me |
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| 27. |
2. Identify the nature of reaction of the following chemicalequations:(a) 2H2(g) + O2(g) →21,0(1) +Heat |
| Answer» RRY I will help you NEXT timeExplanation:PLEASE MARK me BRAINLIST | |
| 28. |
Calculate the oxidation number Ch4calculate the oxidation number CH4 |
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Answer» SorryExplanation:I DONT UNDERSTAND the QUESTION you are ASKING |
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| 29. |
Calculate the molarity of each of the following solutions: (a) 30gof CO (NO₃)26H2O in 4.3L of solution (b) 30ml of0.5m H₂SO4 diluted to 500 ml |
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Answer» a) 0.0268mol/litre B) please specifyExplanation:MOLARITY= No. of moles / VOLUME of solution (in LITRES)a) no.of moles for CO(N0³)².6H20 = 30/260 = 0.115 mol Molarity = 0.115mols / 4.3L = 0.0268 mol/litreb) what is 0.5 m in B is it MOLS or molal? |
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| 30. |
Describe briefly--Fullerenes |
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Answer» ғᴜʟʟᴇʀᴇɴᴇ ɪs ᴛʜᴇ ᴍᴏsᴛ ʀᴇᴄᴇɴᴛʟʏ ᴅɪsᴄᴏᴠᴇʀᴇᴅ ᴄʀʏsᴛᴀʟʟɪɴᴇ ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ. ᴛʜɪs ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ ᴡᴀs ᴅɪsᴄᴏᴠᴇʀᴇᴅ ɪɴ 1985 ʙʏ ᴛʜʀᴇᴇ sᴄɪᴇɴᴛɪsᴛs, ʜ. ᴡ. ᴋʀᴏᴛᴏ, ʀ. ғ. ᴄᴜʀʟ ᴀɴᴅ ʀ. ᴇ. sᴍᴀʟʟᴇʏ. ᴛʜᴇʏ ᴡᴇʀᴇ ᴀᴡᴀʀᴅᴇᴅ ᴛʜᴇ ɴᴏʙᴇʟ ᴘʀɪᴢᴇ ғᴏʀʙᴄʜᴇᴍɪsᴛʀʏ ɪɴ 1996 ғᴏʀ ᴛʜɪs ᴅɪsᴄᴏᴠᴇʀʏ. |
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| 31. |
Which one of the following aldehydes does not respond to Febling solution test?(a) Acetaldehyde(b) Propionaldehyde(C) Butanaldehyde(d) Benzaldehyde |
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| 32. |
Pls give me answer only ,nothing else |
| Answer» PHOTO is not CLEAR EXPLANATION:PLZ do it | |
| 33. |
An element forms compounds XO2 and XO3. Illustrate the law it follow. |
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Answer» An element X forms compounds XO2 and XO3. illustrate the LAW that it follows. It follows law of multiple proportion as the law STATES that ; the masses of one element which COMBINE with a FIXED mass of the second element are in a ratio of whole numbers......! |
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| 35. |
Calculate the oxidation number Ch4 |
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Answer» tion:The oxidation NUMBER of carbon in methane (CH4) is –4, while its oxidation number in carbon dioxide is +4. The oxidation number of HYDROGEN in all compounds is +1. The oxidation number of OXYGEN in its elemental FORM is 0, while its VALUE in carbon dioxide and water is –2. |
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| 36. |
2. 10 g of magnesium is added to IL of Imol/L copper (II) sulfate solution and the mixture is stirred until no further reaction occurs.Mg(s) + CuSO4(aq) MgSO.(aq) + Cu(s) Which of the following is a result of this reaction? a) The resulting solution is colourless.b) 10 g of copper is displaced.c) 63.5 g of copper is displaced.d) All the magnesium reacts. |
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| 37. |
Ok kaal. unblock karti huo abhi main bhahar ja rahi huo |
| Answer» MARK BRAINLIST PLZ.........then I FOLLOW uExplanation:....... | |
| 38. |
Describe-----------fullerenes |
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Answer» ғᴜʟʟᴇʀᴇɴᴇ ɪs ᴛʜᴇ ᴍᴏsᴛ ʀᴇᴄᴇɴᴛʟʏ ᴅɪsᴄᴏᴠᴇʀᴇᴅ ᴄʀʏsᴛᴀʟʟɪɴᴇ ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ. ᴛʜɪs ᴀʟʟᴏᴛʀᴏᴘɪᴄ ғᴏʀᴍ ᴏғ ᴄᴀʀʙᴏɴ ᴡᴀs ᴅɪsᴄᴏᴠᴇʀᴇᴅ ɪɴ 1985 ʙʏ ᴛʜʀᴇᴇ sᴄɪᴇɴᴛɪsᴛs, ʜ. ᴡ. ᴋʀᴏᴛᴏ, ʀ. ғ. ᴄᴜʀʟ ᴀɴᴅ ʀ. ᴇ. sᴍᴀʟʟᴇʏ. ᴛʜᴇʏ ᴡᴇʀᴇ ᴀᴡᴀʀᴅᴇᴅ ᴛʜᴇ ɴᴏʙᴇʟ ᴘʀɪᴢᴇ ғᴏʀʙᴄʜᴇᴍɪsᴛʀʏ ɪɴ 1996 ғᴏʀ ᴛʜɪs ᴅɪsᴄᴏᴠᴇʀʏ. |
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| 39. |
Explain principle of spin quantum number |
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Answer» The Spin Quantum Number ( ms ) DESCRIBES the angular momentum of an electron. An electron spins around an axis and has both angular momentum and orbital angular momentum. Because angular momentum is a VECTOR, the Spin Quantum Number (s) has both a magnitude (1/2) and direction (+ or -).Each orbital can only hold two electrons. One electron will have a +1/2 spin and the other will have a -1/2 spin. Electrons like to fill ORBITALS before they start to pair up. Therefore the first electron in an orbital will have a spin of +1/2. After all the orbitals are half filled, the electrons start to pair up. This second electron in the orbital will have a spin of -1/2. If there are two electrons in the same orbital, it will spin in opposite directions.Explanation: mark me as BRAINLIESTPLEASE Follow Me |
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| 40. |
The mediating particle for electromagnetic forces is a. electronb.mesonc.gravitond.photon |
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Answer» d. photonshope it HELPS yougive me a heartmark me as BRAINLIEST PLS..pls..pls.. |
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| 41. |
Explain the following in terms of gain or lose of oxygen with two example each oxidation reduction |
| Answer» OXIDATION Reaction: It is a chemical reaction in which gain of oxygen or LOSS of hydrogen TAKES place. For example in the FIRST reaction copper is oxidised to become copper oxide and in second Magnesium is oxidised to become Magnesium Oxide. | |
| 42. |
important points on bond enthalpy for quick revision. if possible write in notebook! |
| Answer» ENERGY. Quantifying the energy represented by the bonds in DIFFERENT molecules is an important part of understanding the overall energy implications of a reaction. In this article, we'll explore two different concepts that help describe that energy: enthalpy of reaction and bond enthalpy.Enthalpy of reactionDuring chemical reactions, the bonds between atoms may break, reform or both to either absorb or release energy. The result is a change to the POTENTIAL energy of the system. The heat absorbed or released from a system under constant pressure is known as enthalpy, and the change in enthalpy that results from a chemical reaction is the enthalpy of reaction. The enthalpy of reaction is often written as \Delta\text H_{\text{rxn}}ΔH rxn delta, start text, H, end text, start subscript, start text, r, x, n, end text, end subscript.To better understand enthalpy of reaction, let's consider the hydrogenation of propene, \text{C}_3 \text{H}_6C 3 H 6 start text, C, end text, start subscript, 3, end subscript, start text, H, end text, start subscript, 6, end subscript, to form propane, \text{C}_3 \text{H}_8C 3 H 8 start text, C, end text, start subscript, 3, end subscript, start text, H, end text, start subscript, 8, end subscript. In this reaction, propene gas reacts with hydrogen gas, \text H_2(G)H 2 (g)start text, H, end text, start subscript, 2, end subscript, left parenthesis, g, right parenthesis, to form propane gas:~~~~~~~\text{C}_3 \text{H}_6(g)~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~ \text H_2(g) ~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\text{C}_3 \text H_8 (g) | |
| 43. |
Wht is chemical process?what are the change that takes place during chemical reaction? |
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Answer» Chemical reaction, a process in which one or more substances, the REACTANTS, are converted to one or more different substances, the products. Substances are either chemical elements or COMPOUNDS. A chemical reaction REARRANGES the constituent atoms of the reactants to CREATE different substances as products. |
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| 44. |
Calculate the oxidation number Ch4 , h2o2, |
| Answer» HO..............huhsbhsjxnsnbsbdjdndn | |
| 45. |
What is a fullerenes? |
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Answer» A fullerene is an allotrope of carbon WHOSE molecule consists of carbon atoms CONNECTED by SINGLE and double bonds so as to form a CLOSED or partially closed MESH, with fused rings of five to seven atoms. The molecule may be a hollow sphere, ellipsoid, tube, or many other shapes and sizes.Explanation: |
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| 46. |
What is meant by Lanthanide contraction? Expiain in brief? |
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Answer» Lanthanoid CONTRACTION, also called lanthanide contraction, in chemistry, the STEADY DECREASE in the size of the atoms and ions of the rare earth elements with INCREASING atomic number from lanthanum (atomic number 57) through LUTETIUM (atomic number 71). |
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| 47. |
The number of waves in the fourth orbit of H atom is a.1 b.2 c.3d.4 |
| Answer» 1 H for HydrogenIt is USEFUL for U | |
| 48. |
Write the relation beth density & molasof gas |
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Answer» The relationships between molar MASS and density for a ... The IDEAL Gas Law, PV = nRT can be arranged so that N moles equals the ... |
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| 49. |
5 g mixture of He and Ne exerts 5 atm pressure in a 2 L container at 27°C. The molar mass of the gaseous mixture (in g) is |
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Answer» which SUBJECT... |
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| 50. |
Why water molecules remain associated in liquid water? |
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Answer» They are attracted to each other due to their ELECTROSTATIC attraction. All that MEANS is the HYDROGEN atom is positively charged, while the oxygen atom is negatively charged. Opposites attract, and water is no DIFFERENT. ... The hydrogen of one water molecule will bond to the oxygen atom of another molecule. |
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