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. |
Differentiate between carboxylic acid and phenol by chemical reaction? |
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Answer» and CARBOXYLIC acids can be easily DISTINGUISHED by the sodium bicarbonate test. Sodium bicarbonate is a weak base that readily reacts with carboxylic acids but not with PHENOLS (Carboxylic acids are stronger acids than phenols, so they can easily REACT with a MILD base such as NaHCO3). |
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| 2. |
Two flasks a and B have equal volumes.A is maintained at 300k and B at 600k, while A contains H2 gas, B has an equal mass of CO2 gas. Find the ratio of total K.E of gases in flask A to that of B. |
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Answer» 1:2Explanation:KINETIC energy of GASES is a function of the ABSOLUTE TEMPERATURE |
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| 3. |
With the help of chemical reaction differentiate between alcohol and phenol? |
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Answer» tion:Alcohol alcohol is an organic COMPOUND whose molecule contains one or more hydroxyl GROUPS attached to a carbon atomgenerally aliphatic hydrocarbons aliphatic alcohols are less acidic used in the alcoholic beverage pharmaceutical, ink, etc industries R-OH, where R is the ALKYL group. this is a group of compounds. Phenol phenol is a compound consisting of a hydroxyl groups bonded directly to an aromatic hydrocarbons group aromatic hydrocarbons phenols are more acidic mainly used as antiseptic agentsPh-OH where phone is the PHENOLIC ring this is a SPECIFIC compound |
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| 4. |
How is baking soda used as soda fire extinguisher |
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Answer» using the power of co2Explanation:Baking soda is reacted with an ACID in soda acid fire EXTINGUISHER, the CO2 gas is released from it with strong pressure and being heavy gas extinguishes the fire. |
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| 5. |
What is a suspension??? please tell me |
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Answer» Heya mate.....A suspension is a HETEROGENEOUS mixture in which the solute particles do not DISSOLVE, but get SUSPENDED throughout the BULK of the solvent, LEFT floating around freely in the medium.Hope it helps..... |
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| 6. |
What is carbon 12 in chemistry |
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Answer» Carbon-12 (12C) is the more abundant of the two STABLE isotopes of carbon (carbon-13 being the other), amounting to 98.93% of the element carbon;[1] its abundance is due to the triple-alpha process by which it is created in stars. Carbon-12 is of particular IMPORTANCE in its use as the standard from which atomic masses of all nuclides are MEASURED, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 PROTONS, 6 neutrons, and 6 electrons. |
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| 7. |
What are quantum number ?explain types of quantum numbers? |
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Answer» :Quantum Number -It can be defined as set of four numbers which helps in KNOWING all the information of an electron.Types of Quantum Number -Principal Quantum no.They are represented as 'n'. They are used to explain the main lines of a spectrum. It tells about the main shell in which electron is present. It also tells about approximate distance between the electron and the nucleus and the energy of the shell. The maximum number of electrons present in a shell is represented by 2n². The shells are card as K, L, M, N ....Azimuthal Quantum no.They are represented as 'l'. They are used to explain fine structure of LINE spectrum. It tells US about the number of subshells present in the main shells. It also tells about the relative energies of the subshells and the shape of the orbital. For a given value of n, l can have n values ranging from 0 to n-1. If l = 0, s-subshell; l = 1, p-subshell; l = 2, d-subshell; l = 3, f-subshell; l = 4, g-subshell; l = 5, h-subshell.Magnetic Quantum no.They are represented by 'm or m_l'. They are used to explain splitting of lines in a magnetic field. They TELL about number of orbitals present in a subshell. For a particular value of l of a subshell, m = -l to l including 0. Spin Quantum no.They are represented as 's or m_s'. They are used to explain the magnetic properties of substances. It tells about the direction of electron spin. For a particular value of m (orbital), s = +½, -½. The two arrows pointing upwards and downwards are used to indicate two spin STATES that is spin up and spin down. |
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| 8. |
Answer the question whoever will answer the question I'll mark as brainliast answer |
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Answer» EXPLANATION:PLZ MARK brainliestch4 |
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| 9. |
When zinc metal is treated with dilute solution of mineral acid a gas evolved with utilised hydrogenation of oil . name the gas evolved . write chemical equations of reaction involved |
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Answer» (i) Hydrogen gas is evolved when Zn metal reacts with DILUTE acids.Test for H2 gas: When this gas is passed through soap solution and a burning splinter is brought NEAR the soap BUBBLE filled with gas, it burns with a pop sound.(II) The reaction INVOLVED is in the attanchment: |
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| 10. |
0.24) The average atomic mass of a sample of an element X is 80 u. What is the percentage of each isotope"79x and "81x in the sample. |
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Answer» hzkazjzjnajsskxbshakdhdhsjdhhd |
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| 11. |
An organic compound X on treatment with K2Cr2O7 gives Y compound which reqcts with I2 and sodium carbonate to form tri iodomethane the compound X is optiona)CH3OH b) CH3CHO c)CH3COCH3d) CH3CHOCH3 |
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Answer» it should be (d) CH3CHOCH3Hope you will UNDERSTAND and be HELPFUL. |
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| 12. |
Compare the acidity of ethanol and phenol with the help of resonance |
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Answer» phenol is more acidic than ethanol. ANSWER: PHENOLS are more acidic than phenols because delocalization of electrons takes place in phenols by resonance . Phenol loses its HYDROGEN to form the phenoxide ion which resonates and stabalizes itself ,thus this LOSS of electrons makes phenol more acidic than ALCOHOLS. |
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| 13. |
Calculate the volume and No. of molecules of CO2 liberated at STP. If 75 g. of CaCO3 is treated with dilute hydrochloric acid which contains 10.95 g of dissolved HCl gas. |
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Answer» the anser is posted to you Explanation:Either, LET me tell you the method of solving. First write the balanced chemical EQUATION of the QUESTION written be here FIND the mass of calcium carbonate where the mass of hydrochloric acid is given USING the method of skew-symmetric. |
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| 14. |
Heyyy guys what is tyndall effect explain it with clear explanation plzz |
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Answer» The Tyndall EFFECT is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible.The amount of scattering depends on the FREQUENCY of the light and densityof the particles. As with RAYLEIGH scattering, blue light is scattered more strongly than red light by the Tyndall effect. Another way to look at it is that LONGER wavelength light is transmitted, while shorter wavelength light is reflected by scattering. |
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| 15. |
Determine the number of gram-moles of NH3 in 30.25 L at 22°C and 760mm of Hg.(A) 1.26(B) 2.52(C) 1.86(D) 1.43 |
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| 16. |
which of the following elements would an acidic oxide a basic oxide and a neutral oxides ?na,s,c,k,h |
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Answer» na , K forms BASIC OXIDEH forms neutral oxideand sulphur and CARBON forms acidic oxide |
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| 17. |
Hydration of an Alkene in presence of an acid to form alcohol follows 1.anti- markownikov's law 2.saytzeff's rule 3.simple elimination procedure |
| Answer» 3. SIMPLE ELIMINATION PROCEDURE | |
| 18. |
The percentage composition of a nitroxy compound was found as C=33.96, H=9.4, N= 19.8. Its molecular mass is 219. Calculate the molecular formula of the compound. |
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Answer» tion:parallel plate capacitor of capacity c, is charged to a POTENTIAL v(i) The energy stored in the capacitor when the BATTERY is disconnected and the separation idoubled E(ii) The energy stored in the capacitor when the charging battery is kept connected and thseparation between the capacitor plates is DOUBLED is E,. Then E, /E, value is(a) 4(B) 3/2(c) 2(d) 1/2answer that question is ? |
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| 19. |
What are the indicators for a double replacement reaction? ie. is gas with an odour always produced? |
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Answer» Two compounds with positive and negative IONS.A difference in electro negativity or reactivity between the anions or cations.One of the new compounds in the product must be somewhat insoluble so that it COMES out of SOLUTION.Explanation:For a double replacement to take place there must be two positive and two negative ions.(A must be able to replace B. This will only HAPPEN if A is more reactive that B.must be insoluble so it forms a SOLID and comes out of solution. |
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| 20. |
Which alcohol is prepared by grignard reagent on a ketone followed by hydrolysis |
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Answer» Explanation:The REACTION between Grignard reagents and ketones Ketones have two ALKYL GROUPS attached to the carbon-oxygen double bond. The SIMPLEST one is propanone. This time when you replace the R groups in the GENERAL formula for the alcohol produced you get a tertiary alcohol.plz mark brainliest |
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| 21. |
Why atomic size decreases from left to right in a period and increases down a group ??? please I m in confusion give a better explanation, I will mark brainliest answer. |
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Answer» hey frndExplanation:the REASON is if u go from LEFT to right atomic size decrease becoz effective nuclear attraction means no of valence electrons INCREASES and as electrons increses the nucleus attract more it TOWARDS it so size DECREASES where as in group there are less valence electrons so not much attraction. hope it helps uuuuu........ |
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| 22. |
Find the number of molecules in 39.2 g of nitrogen |
| Answer» E NUMBER of MOLECULES in 39.2 of NITROGEN | |
| 23. |
In which of the following formula mass is preferred over molecular mass? (1)KCl(2)C2H6(3)N2(4)H2O |
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Answer» KCl is an ionic compound thats why FORMULA MASS is preferred for it. |
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| 24. |
Put the metals that do not react with cold water in beakers half filled with hot water |
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Answer» Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the METAL OXIDE and hydrogen. Metals such as lead, copper, silver and gold do not react with water at all. And metals react with acids to give a salt and hydrogen gas. |
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| 25. |
What is the hybridization of furan..?? |
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Answer» Explanation:Furan is the aromatic MOLECULE. To maintain it's AROMATICITY oxygen lone pair gets involved in the resonance and delocalizes all over the RING. So the Oxygen atom formed 2 sigma and have ONE lone pair. So the hybridization is sp2. |
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| 26. |
Q.19) A student was asked by his teacher to separate an impure sample of sulphur containing sand as the impurity.He tried to purify it with the help of sublimation buthe was not successful. Particles of sulphur could not be separated completely from sand.c) What is the value based information associated with this? |
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Answer» gsgdhdhdhdhdhdheueusidididjdjenebrbrbrnrhrhrhrjr |
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| 27. |
.Write four different equations for a chemical reaction, where energy is released in the form of heat/ light / electricity. |
| Answer» C + O2 -----CO2N2 + ,3H3------2NH3 | |
| 28. |
What is the difference between acid and salt |
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Answer» ould necessarily contain hydronium ION in it......for SALTS of COURSE it is not necessary to contain hydronium ionacids are SOUR in tastesalts are not souracids are generally corrosive in naturesalts are not salts are formed from acids and baseshope it HELPED uplz mark brainliest |
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| 30. |
Define corrosion?what is galvanistation of iron? |
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Answer» on of a METAL can be defined as damaging of metal DUE to in contact with moist air or water.Galvanisation of metal is the process of coating of ZINC on metal to PROTECT it from the corrosion caused by rusting.HOPE IT HELPS... |
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| 31. |
give examples of a common acid and a common salt compare thier composition how do they differ and what do they have common |
| Answer» TION:COMMAN SALTS- NAHCO3comman acids-NAOH | |
| 32. |
What happens to the volume when water freezes ? |
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| 34. |
Find out the amount of heat for evaporating 2.8 kg of water at 45 degree celcius |
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Answer» tion:from STD steam tablesthe latent heat of evaporation at 45℃ is 2394.9 KJ/kg for 2 kg the AMOUNT of heat required will be 2394.9*2 = 4789.8 Kj |
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| 37. |
Relative reactivity of alkyl, allyl and vinyl halides Relative reactivity of alkyl, allyl and vinyl halides |
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Answer» ving X as leaving group, + charge develops on C bonded to X.Alkyl: Reference for comparison, Allyl, sp2 hybrid C has high electronegativity. Thus, makes it difficult to BREAK bond(heterolytic cleavage for forming of X-, ) . Positive charge is unstable on more electronegative atom. Using this, allyl are least reactive as sp>sp2,>sp3 (electronegativity and s character).Vinyl C bonded to Sp2 C, when gets positive charge its positive charge is in conjugation with CC π bond does RESONANCE and is thus STABLE so has more TENDENCY to form.Vinyl, Alkyl,allyl |
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| 38. |
IUPAC name of Methyl isopropyl ether |
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Answer» ethoxy-1-methylethane |
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| 39. |
Explain the methods of fission of electron in covalent bonds. |
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Answer» a covalent bond is formed when a pair of E- is shared by TWO ATOMS.breaking that bond (fission)occur when the two atoms making up the covalent bond BREAK apart. !!!! |
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| 40. |
Write IUPAC names: (1) CH₃CH₂CH₂CONH₂ (2) CH₃CH₂OCH₂CH₃ (3) CH₃CH₂CH₂COOCH₃ (4) CH₃CH₂CH₂CH₂CN (5) CH₃CHΞCH-CΞC-CH₂OH |
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Answer» ideEthoxyethaneMethylbutanoatePentanenitrileHex-2,4-ynol |
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| 41. |
Mention the types of structural isomerism and explain in brief. |
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Answer» hdhwkoejfhdgsuwiFfefB |
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| 42. |
Explain hyperconjugation in propene. |
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Answer» njugation: It involves delocalisation of SIGMA electrons of C-H bond of an alkyl GROUP DIRECTLY attached to an atom of unsaturated system or an atom with an unshared p orbital. The hyperconjugating STRUCTURES of propene are represented as: TOTAL number of hyperconjugating structures in propene = 3. |
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| 43. |
In which type of reaction a new π bond is added between two carbon atoms? (A) Substitution (B) Addition (C) Elimination (D) Rearrangement |
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Answer» EliminationExplanation: |
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| 44. |
Ethanal and vinyl alcohol are examples of which isomerism? (A) Metamerism (B) Tautomerism (C) Position isomerism (D) Functional group isomerism |
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Answer» a kbaibwoandobhEiohshsjsi |
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| 45. |
CH₈CONH₂ P₂O₅__> CH₈CN; during this reaction which type of change occurs in hybridisation of carbonyl carbon? (A) sp³ to sp² (B) sp² to sp³ (C) sp² to sp (D) sp to sp² |
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| 46. |
Pent-2-yne has how many σ and π bonds? (A) 10 σ, 2 π (B) 12 σ, 2 π (C) 15 σ, 2 π (D) 13 σ, 3 π |
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Answer» a................ ......... |
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| 47. |
During the addition reaction of ethene which type of change in hybridisation of carbon atom takes place? (A) sp² to sp³(B) sp³ to sp²(C) sp to sp³(D) sp³ to sp |
| Answer» WER to your QUESTIONS is C | |
| 48. |
But-1-ene molecule carbon has which type of hybridisation? (A) sp³ (B) sp² (C) sp³ and sp² (D) sp |
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| 49. |
Which free radical is the most stable? (A) RCH₂* (B) R₂CH* (C) R₃C* (D) C₃H* |
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Answer» Option cExplanation:Tertiary free RADICAL is most STABLE than that of others. Because of hyperconjugation. More is the no. Of alpha hydrogen more is the STABILITY. In option C there is 9 alpha hydrogen if R is CH3 |
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