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.
| 2. |
Write the IUPAC name for the following complexes [ Ag (CN)2]- |
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Answer» Actually, the question is wrong, as silver can only carry a unipositive charge. This is so because Ag(Z=47) has electronic configuration as 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s1,4d10. It has only one unpaired ELECTRON in 4s ORBITAL, which it donates & becomes Ag+ ion. Since cyanide ion has a uninegative charge, the negative charge of one CN− ion would be balanced by the Ag+ ion & the WHOLE COMPLEX will carry a uninegative charge. THUS the compound would be [Ag(CN)2]−. Now its IUPAC name is Dicyanidoargentate(I) ion If there is no complex formation, then the compound would be AgCN & then its name would be Silver cyanide |
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| 3. |
Predict the hybridization of each carbon in the acetate ion |
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Answer» tion:–CH3Hybridisation of C : sp3Molecular geometry about C : tetrahedralApproximate bond ANGLES about C : 109–COO–Hybridisation of C : sp2Molecular geometry about C : TRIGONAL planarApproximate bond angles about C : 120 |
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| 4. |
If 6.022 x 1020 atoms are present in 100 ml of urea solution then find out the molarity of ureasolution.[Ans. : 0.01 M) |
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| 5. |
Calculate pH of following solutions. (a) 3.65 gram HCl in 250 ml solution (b) 9.80 gram HSO in 500 ml solution (c) 1.6 gram NaOH in 250 ml solution(d) 11.2 gram KOH in 500 ml solution |
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| 6. |
Derive the formula for the solubility product of sparingly soluble salt CaF₂ |
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Answer» Explanation:We know the IONIC equation for CaF₂ which isThe SOLUBILITY product constant is holds for the solid substance which are used to DISSOLVE in aqueous solution during equilibrium.It is REPRESENTED by .................(1)LET the concentration of and used these concentration in (1) we get, |
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| 7. |
Can you store lemon pickle in an aluminium utensil? Explain. |
| Answer» TION:No we can't store lemon pickle in aluminum utensil because aluminium is a metal. lemon pickle release ACIDS. METALS react with acids to FORM SALT and hydrogen gas. if lemon pickle would be stored in alluminium utensils it will form toxic salts | |
| 8. |
The basis of modern periodic law is_ |
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Answer» ern periodic law states that the PHYSICAL and chemical properties of the ELEMENTS are the periodic function of the atomic numbers. The various elements with similar properties repeat after CERTAIN regular intervals. This repetition occurs when you arrange the elements in order of their increasing atomic numbers.from it you can EASILY find your compressed answermark as BRAINLIEST |
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| 9. |
Give reasons for the following. (1)Aluminium foils are used to wrap food items(2)Immersion rods for heating liquids are made up of metallic substances(3)Copper cannot displace zinc from its salt solution(4)Sodium and potassium are stored in kerosene |
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Answer» um are used to wrap food ITEM because it is soft a malleable metal and hence can't react with food metal is a good conductor of heat and electricity so IMMERSION rods for heating liquids are made up of METALLIC substance .because copper is less REACTIVE element than zinc.Sodium and potassium are stored in kerosene oil because these metals are highly reactive in presence of air or water ,kerosene oil has no amount of water so,these metal are stored in kerosene oil.HOPE IT HELP You...... |
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| 10. |
23. The dissociation energy of CH (9) is x kcal room and that of C, H,(9) is y kcal mom!, The Cbond energy (in kcal mor') is(1) Y-2X/2 |
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Answer» Explanation:On the basis of systematic examinations it was found that the BMK functional significantly outperformed the other popular density functional theory METHODS including B3LYP, B3P86, KMLYP, MPW1P86, O3LYP, and X3LYP for the calculation of bond dissociation enthalpies (BDEs). However, it was also found that EVEN the BMK functional might dramatically fail in predicting the BDEs of some chemical BONDS. To solve this problem, a new composite ab initio method NAMED G3//BMK was developed by combining the strengths of both the G3 theory and BMK. G3//BMK was found to outperform the G3 and G3//B3LYP methods. It could accurately predict the BDEs of diverse types of chemical bonds in various ORGANIC molecules within a precision of ca. 1.2 kcal/mol. |
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| 12. |
What is linkage isomerase? with example |
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Answer» ....good MORNING ☺️LINKAGE isomerase :- linkage isomerase is the existence of coordination compound that have the same composition different with CONNECTIVITY of the metal to a ligand. . for example :- a thiocynato group COULD be CONNECTED to the metal by either S atom or N atom jai Mahakal ❤️ |
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| 13. |
Mention conjugate acid-base theory giving suitable example. |
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Answer» Examples of conjugate acids include water (base) REACTING with an ACID to FORM the HYDRONIUM ION (conjugate acid), and ammonia (base) reacting with an acid to form the ammonium ion (conjugate acid) |
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| 14. |
Mention Lewis acid from the following compounds (A) HCl (B) CH₃OOH (C) H₂O (D) BF₃ |
| Answer» HCL is LEWIS ACID in the OPTIONS | |
| 15. |
Mention the conjugate base of acid H₂PO₄⁻ (A) PO₄³⁻ (B) HPO₄²⁻ (C) H₃PO₄ (D) H₂P₂O₇ |
| Answer» OPTION BExplanation:As removal of H+ ION from acid will give you CONJUGATE base so hpo4^2- is the answer | |
| 16. |
If ΔH = 400 kjoule mole⁻¹ and ΔS = 0.2 kjoule K⁻¹ mole⁻¹ for a reaction 2x + y --> z, at which minimum temperature the reaction will be spontaneous? |
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Answer» 2000KExplanation:ΔH = 400 kjoule mole⁻¹ ΔS = 0.2 kjoule K⁻¹ For the REACTION at 298 K, the equation FORMED will be - 2A + B → C ∆H = 400 kJ mol–1 and ∆S = 0.2 kJ K–1 mol–1 Therefore, from the expression, ∆G = ∆H – T∆S Assuming the reaction at equilibrium, ∆T for the reaction would beT = ∆H - ∆G × 1/∆S= ∆H /∆S= 400/0.2kJ ( ∆G = 0 at equilibrium)T = 2000 K Thus, for the reaction to be spontaneous, ∆G must be negative. Hence, at a temperature of 2000 K the reaction will be spontaneous. |
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| 17. |
For the following reaction, 2P (g) + Q (g) --> 2R (g) ΔU° = -10.5 kjoule and ΔS° = -44.2 jouleKelvin⁻¹. Find ΔG° for the reaction. Will the reaction occur on its own? Why? |
| Answer» TION:✿━━━━@Mg━━━━✿______________________________✿━━━━@Mg━━━━✿ Answer completedhave a GREAT day AHEAD DEAR | |
| 18. |
When we calculate the electron pairs in NH3 we get 3.5 (1/2(3+5)=1/2×7) . But how it is possible,what the value of EP should we take? |
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Answer» here is your ANSWER...EXPLANATION:. |
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| 19. |
Define Crystallisation and an activity to show it.Best answer will be marked as brainliest!!! |
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Answer» Crystallization:- Crystallization is a technique used for the purification of SUBSTANCES. A separation technique to separate solids from a solution.Activity:Here is an experiment to understand crystallization:Step 1: Take 50 ml water in a beakerStep 2: Add sugar in it and stir itStep 3: Now heat the solutionStep 4: Repeat the process continuouslyStep 5: After some time there will be a point at which no more sugar can be dissolved in water. This stage is the saturation point, and the solution is referred as a SATURATED solutionStep 6 : Now filter the sugar with the HELP of a filter paperStep 7: COLLECT the filtrate in a glass bowl and cool itStep 8: We will observe that some fine crystals are formed in the bowlStep 9: The process of filtration can separate these crystals. The liquid left after the removal of crystals is known as mother liquor.Explanation:hope it's help you‼️‼️☑️☑️♥️♠️ RAM RAM JII ♠️♥️ |
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| 20. |
State and explain law of conservation of mass? |
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Answer» TE!!-The law of conservation of mass states that mass in an isolated system is neither created nor DESTROYED by chemical REACTIONS or physical transformations.-According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.-The law of conservation of mass is useful for a number of CALCULATIONS and can be used to solve for UNKNOWN masses, such the amount of gas consumed or produced during a reaction.MARK AS BRAINLIST..FOLLOW ME ✌️✌️ |
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| 21. |
What is meaning of 1/4 of equivalence point |
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Answer» Equivalence Point Definition. The equivalence point is the point in a titration where the AMOUNT of titrant added is ENOUGH to completely neutralize the analyte SOLUTION. The moles of titrant (standard solution) equal the moles of the solution with unknown concentration. Thanks for the QUESTION. Hope it helps you. |
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| 22. |
Common name of hydrogen hydroxide |
| Answer» HI MARK it as the brainliestExplanation:DIHYDROGEN MONOXIDE | |
| 23. |
Define Angle of Friction. |
| Answer» NSWER REFER TO THE ATTACHMENT | |
| 24. |
Define molar volume. Calculate the number of moles and molecules of carbon dioxide gas in a volume of 89.6 dm^3 measured at STP. |
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Answer» The MOLAR volume of a gas EXPRESSES the volume occupied by 1 mole of that respective gas under CERTAIN temperature and pressure conditions. |
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| 25. |
The change in the internal energy of a given reaction at 300 K is -908 kjoule mole⁻¹, then calculate its enthalpy change. 4NH₃ (g) + 5O₂ (g) --> 6H₂O (g) + 4NO (g) (R = 8.314 joule) |
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Answer» reaction in which two DIFFERENT IONS or a group of ATOMS in the reactant MOLECULES are DISPLACED by each other is called double displacement Explanation:Na2So4+BaCl2 gives BaSo4+2NaCl |
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| 26. |
Explain enthalpy of reaction, enthalpy o neutralisation and enthalpy of formation. |
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| 27. |
What is meant by free energy? What is the relation between change in ree energy during a chemical reaction and the change in entropy? On the basis o this, explain under which conditions the reaction will occur on its own. |
| Answer» TION:ΔG determines the direction and extent of chemical changeThus if the free energy of the reactants is greater than that of the products, the ENTROPY of the world will increase when the REACTION takes PLACE as written, and so the reaction will tend to take place spontaneously. | |
| 28. |
What is meant bu entropy? Explain using the concept of entropy, how the direction of a reaction to occur on its own is determined. |
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Answer» tion:In statistical mechanics, entropy is an EXTENSIVE property of a thermodynamic SYSTEM. It is closely related to the number Ωof microscopic configurations (known as microstates) that are consistent with the macroscopic QUANTITIES that characterize the system (such as its volume, pressure and temperature). Under the assumption that each microstate is EQUALLY probable, the entropy {\displaystyle S}is the natural logarithm of the number of microstates, multiplied by the Boltzmann constant kB. FORMALLY (assuming equiprobable microstates), |
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| 29. |
Explain internal energy and enthalpy and deduce the relation between them |
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Answer» The change in the internal energy of a SYSTEM is the sum of the heat transferred and the work DONE. At CONSTANT pressure, heat flow (q) and internal energy (E) are related to the system's enthalpy (H). The heat flow is equal to the change in the internal energy of the system plus the PV work done.Explanation:please MARK as brainlist |
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| 30. |
Explain the free energy and the Second lae of thermodynamics |
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Answer» Free ENERGY change and SPONTANEOUS processesAccording to the SECOND law of thermodynamics, for any process that occurs in a closed system, the INEQUALITY of Clausius, ΔS > q/Tsurr, APPLIES. ... Similarly, for a process at constant temperature and volume, .Explanation:please mark as brainlist. |
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| 31. |
Explain the standard free energy of ormation of a compound. |
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Answer» The standard Gibbs FREE energy of FORMATION of a COMPOUND is the change of Gibbs free energy that accompanies the formation of 1 MOLE of a SUBSTANCE in its standard state from its constituent elements in their standard states (the most stable form of the element at 1 bar of pressure and the specified temperature.Explanation:please mark as brainlist. |
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| 32. |
Explain Gibbs free energy and useful work. |
| Answer» GIBBS energy is the maximum useful work that a SYSTEM can do on its surroundings when the PROCESS OCCURRING within the system is reversible at constant temperature and pressure. ... The Gibbs FREE energy is the maximum amount of non-expansion work that can be extracted from a closed system. | |
| 33. |
Explain enthalpy and First law o thermodynamics. |
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Answer» The first law of thermodynamics states that the ENERGY of the UNIVERSE is CONSTANT. ... At constant pressure, heat flow (q) and internal energy (E) are related to the system's enthalpy (H). The heat flow is equal to the change in the internal energy of the system plus the PV work done.Explanation:please mark as brainlist |
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| 34. |
2 gm iron pyrite is burnt with O2 to form Fe2O3 and SO2 .the mass of SO2 produced is |
| Answer» 2GM EXPLANATION:we can SAY that EASILY because it is LIKE that only | |
| 35. |
Explain lyman series of line in the emission spectra of hydrogen atom |
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Answer» 1 NAME : Lyman series Group no (ni) : 1 Line no (NF) : 2,3,4...infinite REGION : U.V.2 Name : Balmer series Group no : 2Line no : 3,4,5...infinite Region : Visible 3 Name : Parchen series Group no : 3 Line no : 4,5,6...infinite Region :Infrared Rays 4 Name: BRACKETT series Group no : 4 Line no :5,6,7...infinite Region : I.R.5 Name : P. fund series Group no :5Line no :6,7,8...infinite Region : I.R. |
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| 38. |
Deduce the relation between Cp and Cv. |
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Answer» Cp-Cv =nRExplanation:this is the answer.hope it HELPS |
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| 39. |
Expalin internal energy in detail. |
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Answer» .................... |
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| 40. |
A system absorbed 650 joule heat and did the work. Its internal energy change is 440 joules, then find out how much work has been done. |
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Answer» W = 210 JExplanation:We have been GIVEN SYSTEM absorbed heat Q = 650 Internal energy Δ U = 440 J Now We know that The change in internal energy of a system is equal to the heat added to the system minus the work DONE by the system.We know that Δ U = Q - W 440 = 650 - WW = 650 - 440W = 210 J Work has been done W = 210 J |
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| 41. |
in the reaction N2 + 3H2 -----------2NH3 is 1:3:2 this illustrates the law of a) definite proportion b) reciprocal proportion c) mutiple d) gaseous volume |
| Answer» OPTION A is the CORRECT ANSWER to your QUESTION | |
| 42. |
What will be the value of equilibrium constangt if ΔH < TΔS at 298 K temperature? |
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Answer» it is lo9k8ng too HARD to solbe |
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| 43. |
"The value of absolute free energy of any substance cannot be determined." Why? |
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Answer» Explanation:Internal energy is the energy which is connected with the molecule' s random, and disordered movement. Internal energy is the sum of the molecule's KINETIC and potential energy and there are various energies that CONTRIBUTE towards the internal energy such as the translational energy of the molecule, the rotational and vibrational energy of molecules, the INTER molecular energy, energy associated with bonds within the nucleus and the overall potential energy of molecules.Since, these all are microscopic energies of the molecule thus it is difficult to DETERMINE the value of ABSOLUTE free energy of any substance. |
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| 44. |
What is group theory in chemistry |
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Answer» symmetry is IMPORTANT. in chemistry researches and group theory is the tool that is used to DETERMINE symmetry ,Usually it is not only the symmetry of molecule but also the symmetry of other local ATOMS molecule orbitals ROTATION & vibration of bond etc. That is important . |
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| 45. |
How many elements are in gases state |
| Answer» EOUS element group : HYDROGEN(H),nitrogen(N),oxygen(O)flour-ine(F),chlorine(CL) | |
| 46. |
Write difference between chain and position isomers with example |
| Answer» FERENCE between 1 and 2 is in the location of the bromine ATOM on the carbon CHAIN. In 1, the bromine atom is on a terminal carbon atom; in 2, it is on the internal carbon atom. THUS, 1 and 2 are positional isomers. eg. 2: 1-Butene (3) and 2-butene (4) are constitutional isomers. | |
| 47. |
Find odd man out : Tinning, Anodization, Alloying, Froth floatation |
| Answer» TINNING is a ODD one out because tinning is not a GRADUAL process PLEASE mark my answer as a brainliest | |
| 48. |
Give definition of standard free energy of formation. |
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Answer» ndard Gibbs free energy of formation of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of a substance in its STANDARD state from its CONSTITUENT elements in their standard states (the most stable FORM of the element at 1 bar of pressure and the specified temperature, ...please mark it as a brainlist please PLZ plz plz |
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| 49. |
Write the equation showing relation between free energy change and cell potential. |
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Answer» elationship between standard free ENERGY change and standard cell potentialIn a galvanic cell, the GIBBS free energy is related to the POTENTIAL by: ΔG°cell = −nFE°cell. If E°cell > 0, then the PROCESS is spontaneous (galvanic cell). If E°cell < 0, then the process is nonspontaneous (electrolytic cell).please MARK it as a brainlist please |
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| 50. |
When is the total heat observed by the system during the process used up in work? |
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Answer» udent,◆ Answer -Total heat obsorbed by the system during the process is used up in work when internal energy of the system remains constant.● Explaination -FIRST law of thermodynamics states that the change in the internal energy of a closed system is EQUAL to the AMOUNT of heat supplied to the system, minus the amount of work done by the system on its surroundings. Change in internal energy = Heat absorbed - Work done Heat absorbed = Work done + change in internal ENERGYWHEN change in internal energy is zero, Heat absorbed = Work doneThanks dear. Hope this helps you... |
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