InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 4552. |
What is the difference between bathing soap and washing soaps ? |
| Answer» SOLUTION :Bathing soaps are potassium salts of long chain FATTY acids. They are usually soft and are also free from unused alkali. On the other hand, WASHING soaps are sodium salts of long chain fatty acids. They are usually hand and also contain some residual alkali. | |
| 4553. |
The weakest acid among the following is: |
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Answer» `CH_3COOH` |
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| 4554. |
The value of Henry's constant KH is |
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Answer» greater for GASES with higher SOLUBILITY. |
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| 4555. |
Which has the highest freezing point at 1 atm ? |
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Answer» 0.1 m NACL SOLUTION |
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| 4556. |
What are interstitial in a crystal ? |
| Answer» SOLUTION :Atoms of IONS that fill the NORMAL vacant interstitial VOIDS in a crystal are called interstitial. | |
| 4557. |
To stop bleeding from an injury ferric chloride can be applied. Which of the following comment (s) about the statement is justified? (a) it is not true, ferric chloride is highly poisonous (b) it is true, Fe^(3+) ions coagulate blood which is negatively charged sol. (c) it is true, coagulation takes place because of formation of negatively charged sol with Cl^- ions (d) it is not true, Cl^-ions form positively charged sol, profuse bleeding takes place (e) it is not true, ferric chloride is ionic and gets into blood stream |
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Answer» only (C) |
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| 4558. |
Which one of the fo llowing amines gives carbylamjne reaction'? |
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Answer» `CH_(3)CH_(2)NHCH_(3)` `(CH_(3))_(2)CHNH_(2)+CHCI_(3)+3KOH(ALC.)overset(Delta)(RARR)underset("Isopropyl carbylamine")((CH_(3))_(2)CHNC+KCI)+3H_(2)O` |
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| 4559. |
The value of K_p for the reaction: PCI_5 iffPCl_2 + Cl_2is 1.78 at 250^@C . Calculate thefraction of dissociation at equilibrium when 0.40 mole of PCI_5is vaporized in a vessel containing 0.20 mole of Cl_2gas (i) when a constant pressure of 2 atm is maintained, and (ii) when the volume is kept constant at 4 litres. |
| Answer» SOLUTION :0.247, 0.332 | |
| 4560. |
What is correct about P_(1) "to" P_(4)? |
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Answer» `P_(4)` is a lactone. 
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| 4561. |
What is the Bond energy (In kJ/ mol) of C-H in Methane from the following data? {:(DeltaH_(f) [CO_(2)(g)],,= -394 "kJ/mol"),(DeltaH_(f)[H_(2)O(l)],,= -285 "kJ/mol"),(DeltaH_("siblimation"){"Carbon (graphite)"},,=+716"kJ/mol"),(DeltaH_("combustion")[CH_(4)(g)],,= -890 "kJ/mol"),("Bond energy" (H-H),,=435"kJ/mol"):} |
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Answer» |
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| 4562. |
Which of the following cannot be grouped as polyolefins: |
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Answer» POLYETHENE |
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| 4563. |
Two objects are said to be in thermal equilibrium if they have same |
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Answer» KINETIC energy |
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| 4565. |
What is the effect of the group on the acidity of phenols? CH_(3) |
| Answer» SOLUTION :`-CH_(3)` group decreases the ACIDITY of phenol, | |
| 4566. |
Which of the following is/are the mixed salts? |
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Answer» Rochelle's salt |
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| 4567. |
What is adsorption? |
| Answer» | |
| 4568. |
The Vander Waal's constant 'a' for the gases O_(2), N_(2), NH_(3) and CH_(4) are 1.3, 1.390, 4.170 and 2.253 L^(2) atm mol^(-2) respectively. The gas which can be most easily liquefied is |
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Answer» `O_(2)` Value of constant a is greater than other for `NH_(3)` that's why `NH_(3)` can be most easily LIQUEFIED. |
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| 4569. |
Which element is not naturally occuring ? |
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Answer» Th |
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| 4570. |
Which one of the following is optically inactive ? |
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Answer»
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| 4571. |
Which of the following is lyophilic sol? |
| Answer» Answer :D | |
| 4572. |
The resistivity of 0.5 N solution of an electrolyte in a conductivity cell was found to be 45 ohms. The equivalent conductance of the same solution is ... if the electrodes in the cell are 2.2 cm part and have an area of 3.8 cm^2 |
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Answer» 15.75 |
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| 4573. |
Which of the following element is responsible for oxidation of water to O_(2) in biological process? |
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Answer» Fe |
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| 4574. |
X CaOCl_(2) rarr Y CaCl_(2) + Ca(ClO_(3))_(2)What is X |
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Answer» |
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| 4575. |
Whichis theINCORRECTstatementaboutrateof reaction ? |
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Answer» RATEOF reactiondependson surfaceareaof REACTANTS |
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| 4576. |
When MnO_(2), is fused with KOH in the presence of KNO_(3) as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises Kl to compound (C)whereas an acidified solution of compound (B) oxidises KI to (D), Identity (A), (B), (C), and (D). |
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Answer» SOLUTION :`2MnO_(2)+4KOH+O_(2)tounderset((A))(2K_(2)MnO_(4))+2H_(2)O` `underset("(Green)")underset("MANGANATE")(MnO_(4)^(2-))+H_(2)O+KItounderset("Purple Compound")(2MnO_(4)^(-))+MnO_(2)+2H_(2)O` `2MnO_(4)^(-)+H_(2)O+KIto2MnO_(2)+2OH^( -)+underset((C) )(KIO_(3))` `2KMnO_(4)+3H_(2)SO_(4)+10KItoK_(2)SO_(4)+2MnSO_(4)+8H_(2)O+5I_(2)` |
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| 4578. |
Which of the following statement is true. The entropy if the universe |
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Answer» INCREASES and TENDS TOWARDS MAXIMUM value |
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| 4579. |
Which one of the following is an isotonic pair of solution ? |
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Answer» 0.15 M NaCI and `0.1 M Na_(2)SO_(4)` 0.15 NaCI contains `0.15 xx 2 = 0.3 ` M particles `NaSO_(4) rarr 2NA^(+) + SO_(4)^(2-)` `:. 0.1 M Na_(2)SO_(4)` contains `0.1 xx 3 = 0.3` M particles :. They are isotonic solutions. |
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| 4580. |
Write chemical equation to prepare Buna-S? |
Answer» Solution :They are POLYMERS in which POLYMERIC chains are HELD TOGETHER by the WEAKEST intemolecular forces.
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| 4581. |
Whena browncompound of Mn(A ) is treatedwith HCIit givesgas (B). The gas(B )takenin excessreactswith NH_(3)togiveanexplosivecompound (C ). The compoundA, B and C are |
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Answer» `MnO_(2) , CI_(2) ,NCI_(3)` |
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| 4582. |
Which of the following statements is not correct - |
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Answer» the rate of a FIRST order REACTION decreases with PASSAGE of time as the CONCENTRATION of reactants decreases |
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| 4583. |
What arethe salientfeatures of valence bond theroy (VBT) ? |
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Answer» Solution :The sailent feature of valencebond theory (VBT) are asfollows: (1) Accoridingto thisthory ,a centrealmetal atomor ionpresentin a complex provides a definite NUMBEROF vannct orbitals(s,p , d and f)to commodate the electrons from the LIGANDS fortheformationcoordinatebonds with themetal ion / atom. (2) The number of vacant orbitals provided by the central metal atom or ion is the same as the coordination number of the metal. For example: `CU^(2+)` provides 4 vacant orbitals in the complex, `[Cu(NH_(3)_(4)]^(2+)`. (3) The vacant orbitals of metal atom or ion undergo hybridisation forming the same number of hybridised orbitals, since the bonding with the hybrid orbitals is stronger. (4) Each ligand has ONE or more orbitals containing one or more lone pairs of the electrons. (5) A coordinate bond is formed by the overlapping of the hybrid orbital of the metal atom or ion with the filled orbitals of the ligands with a lone pair of electrons. (6) Hence each coordinate bond provides two electroms to the central metal atom or ion. (7) Greater the overlapping, the stronger is the coordinate bonds. (8) When inner orbitals namely (n - 1)d-orbitalsin transtitionmetal atomareionhydridise ,the complex is alledinnercomplexand whenouterorbitals i.e.,nd-orbitalshydridisethen thecomplexis calledouter complex. (9) When the central metal atom or ion in the complex contains one or more unpaired electrons the complex is paramagnetic while if all the electrons are paired, the complex is diamagnetic. (10)Strong field ligands like `NH_(3)`, `CN^(-)`, etc. in the complex cause pairing of the unpaired electrons present in the metal atom or ion. This process is called spin pairing process. This changes the magnetic properties of the complex. |
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| 4584. |
When propionic acid is treated with aqueous NaHCO_(3),CO_(2) is liberated. The 'C' of CO_(2) comes from: |
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Answer» METHYL GROUP |
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| 4585. |
Which of the following two are isostructural ? |
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Answer» `XeF_(2), IF_(2)^(-)` |
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| 4586. |
The relative lowering vapour pressure of a solvent at a given temperature due to dissolution of a non-volatile solute is equal to ………………..of……………..in the solution. |
| Answer» SOLUTION :MOLE FRACTION, SOLUTE | |
| 4587. |
Which of the following is most suitable reagent to distinguish ether from alcohol ? |
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Answer» NA metal |
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| 4588. |
Which is the best method for the protection of (OH) group during the following synthesis ? Explain. a. |
Answer» Solution :a. In the conversion of (A) to (B), the `(C=C)` bond in (A) has to be converted to `(BR--CH--CH--)` bond by the addition of HBr in the presence of peroxide (ROOR) by anti-Markovnikov addition. If `(--OH)` group is not protected, it WOULD also be converted to (Br) group is not protected, it would also be converted to (Br) group, since it is allyl alcohol. So, `(--OH)` has to be protected before reacting (A) with `(HBr + ROOR)`. Protection of `(--OH)` is best by benzylation method: The silylation method is not preferred due to steric hichrance of BULKY silyl group, and because `(--OH)` group is also sterically hindered. ROTHP cannot be used becaused alcohol would LIKELY rearrange under the acidic CONDITIONS of the ether formation.  b.In the conversion of (C) to (D), `(--CH_(2)Br)` group has to be converted to `(--CH_(2)--D)` group by reacting (A) with Mg followed by reaction with `D_(2)O`. If `(--OH)` is not protected `(--MgBr)` would react with the acidic H of (OH) group. `HO--CH_(2)CH_(2)Br + Mg rarr`  So, `(--OH)` group has to be protected before reacting (A) with `Mg//D_(2)O`. |
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| 4589. |
Which does not possess allotropic forms? |
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Answer» C |
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| 4590. |
The strongest oxidising agent among the following is |
| Answer» Answer :B | |
| 4591. |
Which is a redox reaction ? |
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Answer» `2CuI_2 RARR 2CuI +I_2` |
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| 4592. |
Toltal number of isomeric alkyl halide can be calculate by formula |
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Answer» `I=2^(N-1)` |
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| 4593. |
Which of these carbonyl compounds on reduction with Zn-Hg/HCl will give the same compound as product |
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Answer»
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| 4594. |
Which of the following would not given 2 - phenylbutane as the major product in a Friedel - Crafts alkylation reaction with benzene? |
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Answer» 1 - butene + HF |
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| 4595. |
Which of the followng statement are correct? |
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Answer» All substances have MAGNETIC properties |
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| 4596. |
Write the equation of the reaction of hydrogen iodide with : (i) 1- propoxypropane (ii) methoxybenzeneand (iii) benzyl ethyl ether. |
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Answer» Solution :(i) `underset("1-Propoxypropane")(CH_(3)CH_(2)CH_(2)-O-CH_(2)CH_(2)CH_(3))overset(HI)underset(373K)rarr underset("PROPAN - 1 - OL")(CH_(3)CH_(2)CH_(2)-OH)+underset("1 - IODOPROPANE")(CH_(3)CH_(2)CH_(2)-I)` (II) 
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| 4597. |
WhenGrignard reagent(CH_(3) MgBr)istreatedwithwater, weget: |
| Answer» Answer :D | |
| 4598. |
Which one the following statements is false ? |
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Answer» The CORRECT order opf osmotic pressure for 0.01 M aquaeous solution of each compound is `BaCI_(2)gtKCIgtCH_(3)COOHgts"SUCROSE"` |
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| 4599. |
in which of the following case entropy increases |
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Answer» BOILING of an egg |
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| 4600. |
The term 'sorption stands for |
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Answer» ABSORPTION |
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