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. |
Vinyl polymers that do not dissolve in water after film formatio? |
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Answer» Polyvinyl formal (PVF) and Polyvinyl acetate (PVAc) are the vinyl polymers that are highly insoluble in water instead they FORM a film in water instead they dissolved in anionic surface-active agent resolution. compound SOLUTIONS of PVF, PVAc, and polyvinyl alcohol in surface-active agent were studied viscometrically and electrophoretically. The compound forms a posh with the surface-active agent, the behaviour of that is analogous to it of electrolyte. The advanced is charged and migrates to the anode. With qualitative analysis of the answer of polymer‐surfactant advanced against running water, the compound separates out; but, the compound doesn't separate of undialyzed resolution, NOTWITHSTANDING the answer is diluted to way less concentration than the CMC of the surface-active agent. therefore the dissolution of the compounds within the surface-active agent resolution is because of the homeward adsorption of surface-active agent ions on the polymer molecule. the quantity of adsorb-able surface-active agent ions was calculable. The adsorption could be of the Langmuir SORT. |
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| 2. |
The rate of diffusion of methane at given temp is twice of a gas x the molecular wieght of gas x is |
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Answer» The rate of diffusion of methane at given TEMP is twice of a gas x the molecular weight of gas x is 64. The rate of diffusion of two GASES are compared as follows. As The rate of diffusion of methane at given temp is twice of a gas x the molecular weight of gas x is 64. Hence, Squaring both sides to remove the square root. Then we will get after squaring both sides,Then we will get after squaring both sides, M2 = 64 Detailed SOLUTION and explanation is given in the attachment |
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| 3. |
Write the disadvantages of incomplete combustiob? |
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Answer» There is one that i know of and that is that less HEAT is given out COMPARED to COMPLETE COMBUSTION |
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| 4. |
Define and prove law of conservation of mass with diagram |
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Answer» Hey here is your answer..... |
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| 7. |
Two charges q1 and q2 are placed on the x-axis, with q1 at x=a and q2 at x=3a |
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Answer» The FORCE experienced by Q due to q1 is, F1= kQq1/(a+a/2)2 The force experienced by Q due to q2 is, F2= kQq2/(a/2)2 For the net force on Q to be zero, [in this CASE q1 and q2 must be of same nature, we CONSIDER both to be positive] F1 - F2 = 0 => kQq1/(a+a/2)2 - kQq2/(a/2)2 = 0 => q1/(3a/2)2 = q2/(a/2)2 => q1 = 9q2 Similarly when Q is placed at 3a/2, [in this case q1 and q2 must be of opposite nature, we consider q1 as positive and q2as negative] The force experienced by Q due to q1 is, F1= kQq1/(a+3a/2)2 The force experienced by Q due to q2 is, F2= -kQq2/(a/2)2 For the net force on Q to be zero, F1 - F2 = 0 => kQq1/(a+3a/2)2 + kQq2/(a/2)2 = 0 => q1/(5a/2)2 = -q2/(a/2)2 => q1 = -25q2 |
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| 8. |
What type of products needed to manufacturing chemical products? |
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| 9. |
What is relation between molarity and normality and strength? |
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Answer» NORMALITY is defined as gram-equivalent of solute dissolved in ONE litre of solution ,Unit of MORALITY is N.A solution having normality equals to UNITY is CALLED normal solution . Normality × equivalent mass=strength of solution in g/L. LIKE IT IF IT IS CORRECT. |
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| 11. |
Why there is a coating of tin on an iron can even though tin is less reactive than iron |
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Answer» The iron is more REACTIVE it rust fastly because of oxygen and moisture it is better to coat its KEEPS TIN from preventing |
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| 12. |
Which element do not exist in atomic state freely |
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Answer» There are so MANY ELEMENTS which do not EXIST FREELY like |
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| 13. |
Plz answer this.. the questions in the blue box |
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Answer» 1.hydrogen BUBBLES |
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| 14. |
State which physical propreties of a crystal are correlated with the water of crystallisation |
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Answer» Water of crystallisation are water molecules that are PRESENT inside CRYSTALS. Water is often INCORPORATED in the formations of crystals from aqueous solutions. |
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| 15. |
What is universal indicator give any two universal indicators? |
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Answer» INDICATOR LOW pH colour Transition pH range Methyl RED Yellow 4.8 – 6.0 Bromothymol BLUE Yellow 6.0 – 7.6 Thymol blue Yellow 8.0 – 9.6 Phenolphthalein Colourless 8.3 – 10.0 |
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| 16. |
The heat of combustion of benzene at 27 degree c found by bomb calorimeter that is for the reaction |
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Answer» Your QUESTION seems to be incomplete but all you need to know about these aromatic compounds such as BENZENE have six CARBON atoms in the ring. The heat of combustion produced will depend on the number of carbon atoms in the STRUCTURE hence it may be high or low. Using this OVERVIEW will help you know how to go about it. |
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| 17. |
What was the limitation of dobbereiner |
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Answer» FIRST: Doberenier could only find four TRIADS at that time. All those elements could not be classified as Doberenier’s triads. Second: This was a major DRAWBACK of Doberenier’s triads. He stated that when three elements of same chemical properties were arranged in order of their increasing atomic masses, the sum of first and third element was rougly the average of the middle element. But, three elements NITROGEN, phosphorus and arsenic have same chemical properties, but these three elements do not follow Doberenier’s rule. Atomic mass of nitrogen is 14 u and that of arsenic is 74.9 u but their average is 14+74.9/2= 44.45 u which is much higher than atomic mass of phosphorus i.e, 31 u. So, Doberenier’s triads could not be used. Hope it helps |
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| 18. |
Give one chemical test to distinguish between aniline and N-methylaniline |
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Answer» HoLLa mate, |
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| 20. |
What is the relation between molecules n gram molecules? |
| Answer» ORIGIN of gram molecule. Gram atoms, gram molecules and gram ions are apparently the same but still have minor DIFFERENCES. Gram atom is the no. of atoms present in ONE mole of a SUBSTANCE. WHEREAS gram molecule is the no. of molecules present in one mole of that substance instead of the atoms. | |
| 21. |
What happens when pressure increasing and temperature of a liquid? |
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Answer» When PRESSURE increases then INTERMOLECULAR forces DECREASE and when temperature increases then intermolecular forces increases. |
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| 23. |
tuning the physicochemical properties of diverse phenolic ionic liquids for equimolar co 2 capture by the substituent on the anion |
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Answer» Phenolic ionic liquids for the efficient and REVERSIBLE capture of CO2 were designed and prepared from phosphonium hydroxide and substituted PHENOLS. The electron‐withdrawing or electron‐donating ability, position, and number of the substituents on the anion of these ionic liquids were correlated with the physicochemical properties of the ionic liquids. The results show that the stability, viscosity, and CO2‐capturing ability of these ionic liquids were significantly affected by the substituents. Furthermore, the relationship between the DECOMPOSITION temperature, the CO2‐ABSORPTION capacity, and the basicity of these ionic liquids was quantitatively correlated and further rationalized by theoretical calculation. Indeed, these ionic liquids showed good stability, HIGH absorption capacity, and low absorption enthalpy for CO2 capture. This method, which tunes the physicochemical properties by making use of substituent effects in the anion of the ionic liquid, is important for the design of highly efficient and reversible methods for CO2‐capture. This CO2 capture process using diverse phenolic ionic liquids is a promising potential method for CO2 absorption with both high absorption capacity and good reversibility. |
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| 24. |
Can someone help me with this question? |
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Answer» The best for us a good WEEKEND so don't have been in my OPINION is my CV in. |
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| 25. |
mention the factor that decides the number of elements in 1,2,3,4 period.what is the number of element in 2,3 period. |
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Answer» I THINK the element number is 12 and 13. but I'm not sure about it . SORRY YA |
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| 26. |
what is the difference between litmus paper and litmus solution? what is the colour of the litmus solution ?and litmus paper |
Answer» HEYA MATE HERE U GOlitmus solution is a DYE extracted from lichen a plant belonging to the division of thallophyta and is USED as INDICATOR HOPE THIS WILL HELP U |
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| 27. |
The materials having same elastic properties in all directions are called |
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Answer» The materials having same ELASTIC properties in all directions are CALLED ISOTROPIC. |
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| 28. |
state which of the following solutions exhibit tyndal effect ? starch solution,sodium chloride solution, tincture of iodine, air |
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Answer» Starch SOLUTION and tincture IODINE are COLLOID and thus will show tyndall EFFECT. |
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| 29. |
Why should we not start numbering from carboxylic carbon since carboxylic carbon should be numbered first always? |
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Answer» HEY mate! it's RULE that if CARBON contaning functional group is directly attached to ring.. then ring should be the parent CHAIN. exception :-( KETONES) HOPE it will help you.. #Phoenix |
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| 30. |
What is the dispersed phase and the dispersion medium in an egg? |
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Answer» INSIDE an egg, the dispersed phase is the COMPONENT that is present in small quantities WHEREAS the dispersed medium is present in larger quantities. THEREFORE, albumin is CONSIDERED as the dispersed materials and the yolk is the dispersed phase of an egg. |
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| 31. |
How polarity explains about elecyronegativity |
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Answer» Due to ELECTRONEGATIVITY difference between atoms in a molecule, shared PAIR of ELECTRONS move to the more electronegative atom.So it aquires a partial negative charge and the other atom gets a partial positive charge.Thus a charge separation is formed in the molecule and it becomes POLAR. |
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| 32. |
Conditions for covalent bondPLZ ANSWER IT GUYS!! |
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Answer» HEY MATE! |
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| 33. |
Which of these Has maximum atomic size K ,Ca,Al,P |
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Answer» CA- CALCIUM has MAXIMUM ATOMIC SIZE. Atomic size of Calcium is 4⃣0⃣⚪0⃣7⃣8⃣. |
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| 35. |
The centre of mass of an electron and proton when released move faster towards proton |
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Answer» Assertion The CENTRE of MASS of an ELECTRON and proton, when released moves FASTER towards proton. 46. Assertion A planet moves faster, when it is closer to the SUN in its orbit and vice versa. |
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| 36. |
Write the product obtained by the reaction between 2-bromobutane and aqueous KOH |
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Answer» E2E2 reactions are SELECTIVELY trans |
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| 37. |
The strongest hydrgen bond is present inoptionsNh3, water, HF, ethylalcohol with explanation ...must |
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Answer» Hey mate your answer is HF.because Then the electronegativity of F is the higher of the group (indeed, it is the highest of all the 118 elements) . The higher the electronegativity the stronger the attraction that the halogen attracts the ELECTRONS and the stronger the HYDORGEN bonding. Then, the CONCLUSION is that HF has the strongest hydrogen bonding. |
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| 38. |
Account for the following: (1) All the elements of the same group have similar properties. (2) The noble gases were discovered late . |
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Answer» Your answer is 1. All the ELEMENT in same GROUP have same PROPERTIES because they have ARRANGED the element of same properties in same group . 2. The noble GAS has been discovered late because it is an extermily unreactive gas . |
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| 39. |
NH3 possess high boiling point. Why?? |
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Answer» However, ammonia, unlike PHOSPHINE, hashydrogen bonds due to the presence of a covalent bond between hydrogen and HIGHLY electronegative nitrogen with a lone PAIR. Hydrogen bonds are stronger than London DISPERSION FORCES, therefore ammonia hasstronger intermolecular forces and higher boiling point. |
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| 40. |
What is material safety data sheet of chemicals and its 16 section? |
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Answer» The safety data SHEET of chemicals is a manufacturer for importer provide for safety data SHEETS or material for each HAZARDOUS CHEMICAL to downstream users to communicate INFORMATION on these hazards. |
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| 41. |
The atomic no of the element having maximum no. Of unpaired 3p electron is |
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| 42. |
The articles made of iron when placed in moist air get covered with reddish-brown powdery substance.. Is this physical change or chemical change explain |
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Answer» It is a CHEMICAL CHANGE because the reddish-BROWN substance which you mentioned is nothing but rust and the process is called rusting. rusting is a chemical process in which iron reacts with oxygen in presence of MOISTURE to produce a reddish brown substance called rust |
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| 43. |
How to find the no. of antibonding electron pairs |
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Answer» To CALCULATE BOND order in chemistry, subtract the number of the ELECTRONSIN the antibonding molecules from THENUMBER of electrons in the bonding molecules. Divide the result by 2 to getthe result. The higher the bond order, the more stable the molecule. |
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| 44. |
Carbon can bond with both O AND O2. However neither carbon nor oxygen exhibit variable valency . How is this possible ??????? Plz answer fast |
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Answer» HEY boi... Actually here Carbon SHOWS coordinate bond with Oxygen in Carbon Monoxide i.e. CO But in case of Carbon Dioxide... the former forms DOUBLE bond with TWO atoms of Oxygen.. O=C=O is carbon dioxide the image above is carbon monoxide |
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| 45. |
Why do soaps not so effective in case of hard water |
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Answer» The insoluble sticks on the clothes and so the cleaning capacity of SOAP is reduced. The cleaning ACTION of soap is very effective in SOFT water because it contains negligible calcium and magnesium ions. |
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| 46. |
What is homologeous series give example of two third member of series? |
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Answer» a HOMOLOGOUS series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they CONTAIN.[1] This can be the length of a CARBON chain,[1] for example in the straight-chained alkanes (paraffins), or it could be the number of monomers in a homopolymer such as amylose.[2] |
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| 47. |
What is condensation polymerisation write with an example? |
| Answer» CONDENSATION polymer are any kind of polymer formed by condensation reaction.It is a class of polyamides.It FORM by reaction of CARBOXYLIC ACID and amine.Ex of condensation polymer is nylons and PROTEIN. | |
| 48. |
Fe2O3 +H2=Fe+H2O balance the chemical equation |
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Answer» HEY frnd..... BALANCED chemical EQUATIONS.... HOPE THIS HELP YOU ☺☺❤❤❤ |
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