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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.
| 8051. |
Which of the following is an example of absorption? |
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Answer» Water on SILICA gel |
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| 8052. |
What are constituent amines formed when the mixture of (i) and (ii) undergo Hofmann bromamide degradation? |
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Answer»
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| 8053. |
Which solution has the highest pH ? |
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Answer» 0.10 M `CH_3COOH` |
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| 8054. |
Write the Nernst equation for the cell reaction in the Daniel cell. How will the E_(cell) be affected when concentration of Zn^(+) ions is increased? |
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Answer» Solution :`Zu+CU^(2+)toZn^(2+)+Cu,""E_(cell)=E_(cell)^(@)-(0.059)/(2)"LOG"([Zn^(2+)])/([Cu^(2+)])` When `[Zn^(2+)]` is INCREASED, `E_(cell)` will decrease. |
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| 8055. |
Which of the following option is correct regarding [Fe(H_(2)O)_(5)NO]SO_(4) ? (P) Fe in +2 oxidation state (Q) It obey's Sidgwick EAN rule It is an outer orbital complex (S) NO ligand has +1 oxidation state. |
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Answer» FFTT EAN=26-1+12=37` `SP^(3)d^(2)` hybridisation. |
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| 8056. |
Which of the following will not react with ammoniacal solution of silver nitrate ? |
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Answer» `HC -= HC` |
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| 8057. |
When phenol reacts with ammonia is presence of ZnCl_(2) at 300^(@)C, it gives |
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Answer» PRIMARY amine 
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| 8058. |
The volume (in mL) of 0.1 M AgNO_(3)required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H_(2)O)_(5)Cl]Cl_(2), as silver chloride is close to |
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Answer» `RARR` m mole of `Cl^(-)=0.3xx2=0.6` `rArr` m mole of `Ag^(+)` = m moles of `Cl^(-)` `rArr 0.1xx V=0.6` `rArr V=6 mL`. |
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| 8059. |
Which of the following statements ragarding a chemical equilibrium wrong |
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Answer» An equilibrium can be shifted by altering the temperaturee of pressure |
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| 8060. |
Which one of the following is a cationic detergent ?Sodium lauryl sulphate,cetyltrimethyl ammonium bromide,sodium dodecylbenzene sulphonate,Glyceryl palmitate. |
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Answer» SODIUM lauryl sulphate |
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| 8061. |
Which of the following statements are correct ? (I)Both melting and boiling points of H_2O are higher than those of H_2Te. (II)In both N_2O_5 and N_2O_4 all N-O bond lengths are equivalent (III)In both crystalline NaHCO_3, HCO_3^(-) forms only dimeric anion through hydrogen bond. (IV)Amongst B_2, C_2, N_2^(-) and O_2 on further ionization (losing single electron) form thermodynamically more stable species. |
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Answer» (I) and (II) `{:(,H_2O,H_2Te),("m.p/K",273,222),("b.p/K",373,269):}` (II)  (III)(a) In `NaHCO_3` , the `HCO_3^-` ions are linked into an infinite CHAIN and (b) in `KHCO_3, HCO_3^-` FORMS a dimeric anion.  (IV)`B_2-B.O.=1 and B_2^(+) - B.O=1/2 , C_2-B.O. =2 and C_2^(+) B.O.=1.5` `N_2^(-)-B.O=2.5 and N_2-B.O =3 , O_2-B.O=2 and O_2^(+)B.O.=2.5` Bond strength `prop` bond ORDER. |
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| 8062. |
The value of charge of one electron is equal to ................................ . |
| Answer» SOLUTION :`1.6 XX 10^(-19)C` | |
| 8063. |
Two solutions have different osmotic pressures. The solution of lower osmotic pressure is called: |
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Answer» ISOTONIC solution |
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| 8064. |
Which of the following product is obtained on performing Riemer Tiemann reaction on phenol ? |
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Answer» SALICYLIC acid |
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| 8065. |
Which is liquid at room temperature : |
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Answer» Acetamide |
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| 8066. |
Which of the following particle is emitted in the reaction ._(13)Al^(27) + ._(2)He^(4) rarr ._(14)P^(30) +.... |
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Answer» `._(0)N^(1)` |
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| 8067. |
Which among the following process is used to remove grease from soap |
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Answer» EMULSIFICATION |
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| 8068. |
The values of Delta H and Delta S for the reaction. C("graphite") + CO_(2)(g) rarr 2CO(g) are 170 kJ and 170 JK^(-1), respectively. This reaction will be spontaneous at : |
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Answer» 910 K Here, `Delta G` will be negative when `T delta S gt Delta H` `Delta H = 170 kJ = 170000 J` `Delta S = 170 JK^(-1) mol^(-1)` `T Delta S gt Delta H` only when T = 1110 K |
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| 8069. |
Which compound yields an N-nitroso amine after treatment with nitrous acid (NaNO_(2)+HCl)? |
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Answer»
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| 8070. |
Write the energy currency of the cell. |
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Answer» ATP |
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| 8071. |
Write the name of the linkage joining two amino acids. |
| Answer» SOLUTION :PEPTIDE BOND , `-CO-NH-`. | |
| 8072. |
Which of the following wil giveH_(2_((g))) at cathode andO_(2_((g))) at anode on electrolysis using platinum electrodes |
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Answer» `NaCl=Na^(+)+CL^(-)` `H_(2)O=H^(+)+OH` At cathode `H^(+)` will DISCHARGE SINCE the discharge potential of `H^(+) lt Na^(+)` `2H^(+)+2e^(-)toH_(2)(g)` At anode Due to very lesser amount of `Cl^(-),OH^(-)` ions will discharge at anode `4OH^(-)toO_(2)+2H_(2)O+4e^(-)` |
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| 8073. |
Which of the following does not contain material particles |
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Answer» ALPHA RAYS |
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| 8074. |
Which of the following methods is employed to control the corrosion of underground pipelines and tanks? |
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Answer» Cathodic protection In cathodic protection, a buried steel pipeline is connected to an active metal (that is, a highly electropositive substance) such as `Mg`. Consequently, a voltaic CELL is formed, the active metal is the anode and iron becomes the cathode. Wet soil forms the electrolyte, and the electrode reactions are `"Anode :" Mg(s) rarr Mg^(2+)(aq.)+2e^(-)` `"Cathode :" O_(2)(g)+2H_(2)O(l)+4e^(-) rarr 4OH^(-)(aq.)` As the cathode, the iron-CONTAINING steel pile is protected from oxidation. Of course, the `Mg` rod (or strip) is eventually consumed and must be replaced, but this is cheaper than digging up the pipeline. This uise of an active metal to protect iron from corrosion is called cathodic protection. The more activemetal is preferentially oxidized and is thus called a 'sacrifical anode'. Similar methods are used to protect bridges and the hulls of ships from corrosion. The small yellow horizontal strips attached to the ship's hull are blocks of `Ti` (coated with `Pt`). The hull is steel (mostly iron). When the ship is insalt water, the `Ti` blocks become the anode and the hull the cathode, in a voltaic cell. Because oxidation always occurs at the anode, the ship's hull (the cathode) is protected from oxidation (corrosion). Other active matals, such as `Zn`, are also used as sacrificial anodes. Galvanizing (coating the iron with zinc) is another method of corrosion protection. It combines the two approches: sactrified protection and cathodic the two Even if the `Zn` coating is broken so the iron is exposed, the iron is not oxidized. `Zn` is still oxidized in preference to the less reactive `Fe` as long as the two metals remain in contact. Surprisingly, corrosion can also be inhibited if electrons are pumped out of metal. This methodis based on a rather complex phenomenon called passivation. Passivation occurs naturally. Some metals such as `Al` or `Cr` that are high in the `emf` series are relaticely corrosion reistant because of passivation. Iron corrodes completely in dilute nitric acid, but it does not corrode in concentrated nitric acid because of passivatikon. The rapid eraction that takes place in the concentrated acid causes formation of an oxide film that protects the iron from further attack. The most widely used method is to use paint or a similar coating to prevent `O_(2)` and `H_(2)O` from COMING in contact with the metal surface. Another group of methods uses what are called corrosion inhibitors, substance that form surface films that INTERFERE with the FLOW of charge needed for corrosion to occur. There are anodic inhibitors, which act at the anode and interfere withe matel dissolution reaction. These include inorganic salt such as chromates, phosphates. and carbontes, as well as compounds containing organic nitrogen or sulfur. There are also cathodic inhibitors, which interfere with the reduc-tion process that occurs at the cathodic region of the metal surface. These inculde salt of magnesium, zinc, or nickel. |
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| 8075. |
What happens when H_3PO_3 is heated? |
| Answer» Solution :On HEATING, `H_3PO_3` UNDERGOES DISPROPORTIONATION to FORM PHOSPHINE and orthophosphoric acid `4H_3PO_3toPH_3+3H_3PO_4` | |
| 8076. |
What is the side product of soap industry ? Give reactions showing soap formation. |
| Answer» SOLUTION :GLYCEROL. | |
| 8077. |
The substrate will be binded to the active site of the enzyme through |
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Answer» Ionic binding |
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| 8079. |
ThestandardreducationpotentialE^@for halfreactionsare Zn toZn^(2+) + 2e^(-, E^@=- 0.76VFetoFE^(2 +)+ 2e^(-),E^(@)=- 0.41V theEMFof the cellreaction Fe^(2+) +ZntoZn^(2+) +Fe is |
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Answer» `-0.35 `V |
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| 8080. |
Which of the following is not an example of SN^2 reaction ? |
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Answer»
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| 8081. |
Which of the following statements is incorrect for 1s orbital of hydrogen atom? |
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Answer» It is possible to FIND an electron at a distance `2a_(0)` (`a_(0)=` Bohr radius) |
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| 8082. |
The specific reaction rates of a chemical reaction are 2.45xx10^(-5)sec^(-1) at 273 K and 1.62xx10^(-4)sec^(-1) at 303 K. Calculate the activation energy. |
| Answer» SOLUTION :`"96.101 kJ/mole"` | |
| 8083. |
Which are the monomers of Nylon 66 ? |
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Answer» Adipic ACID - HMDA |
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| 8084. |
The shape of 2-butene is: |
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Answer» Linear |
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| 8085. |
What starting material is required for the following reaction? |
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Answer»
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| 8086. |
Which of the following statements is not correct for a pseudo first order rate constant? |
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Answer» Its VALUE is independent of the reactant PRESENT in SMALL amount. |
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| 8087. |
Which of the following staements is not correct? |
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Answer» Argon is USED in electric bulbs |
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| 8088. |
Which is not a electrophile |
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Answer» `AlCl_(3)` |
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| 8089. |
What is the role of function of sulphur in vulcanization of rubber ? |
| Answer» Solution :During vulcanization, natural ID HEATED with `3-5%` sulphur . The FUNCTION of sulphur is to introduce sulphur (or disulphide) BRIDGES or cross-links between polymer chainsthereby IMPARTING more tensile strength, elasticity and resistance to abrasion. | |
| 8090. |
Which of the following statements is correct regarding formic acid ? |
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Answer» It is a reducing agent. |
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| 8091. |
The wavelength of a spectral line for an electronic transition is inversely related to: |
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Answer» velocity of electron undergoing transition |
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| 8092. |
which of thefollowingreactionof aminescan beused todistinguish between1^(0), 2^(0) , 3^(0) amine ? |
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Answer» Oxidation |
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| 8093. |
Which of the following statement(s) is /are correct with respect to the crystal field theory ? |
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Answer» It considers only the metal ion d-orbitals and gives no consideration at all to other metal orbitals. |
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| 8094. |
Which of the following coordinate complexes is an exception to EAN rule? (Given At. No. Pt =78, Fe=26, Zn=30, Cu=29] |
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Answer» `[Pt(NH_(3))(6)]^(4+)` (a) EAN = 78-4+12=86 b) EAN = 26-2+12=36 C) EAN 30-2 +8 = 36 (d) EAN = 29-2+8=35 |
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| 8095. |
What happens to the colour of coordination compound [Ti(H_(2)O)_(6)]Cl_(3) when heated gradually ? |
| Answer» Solution :On heating, its colour becomes LIGHTER as `H_(2)O` is GRADUALLY LOST. When all `H_(2)O` molecules are lost, it becomes colourless because in the ABSENCE of ligands, CRYSTAL field splitting does not occur. | |
| 8096. |
The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is |
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Answer» vapour phase refining |
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| 8097. |
White phosphorus contains : |
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Answer» `P_(2)` molecules |
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| 8098. |
The time taken for the completion of 90% of a first order reaction is 't' min . What is the time (in sec) taken for the completion of 99% of the reaction ? |
| Answer» ANSWER :C | |
| 8099. |
Thespecificconductance(orconductivity ) of0.014MNaBrsolutionis 3.16 xx 10^(-4) S cm^(-1) .Findthe molarconductivity of thesolution . |
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Answer» Specificconductance= conductivity = K `=3.16 XX 10^(-4)S cm^(-1)( or Omega^(-1)cm^(-1))` Molarconductivity = `^^_(m) = ?` `^^_(m) = (k xx 1000)/( C)` ` =(3.16 xx 10^(-1)xx 1000)/( 0.014)` `mol L ^(-1)` `= 22.57 S cm^(2) mol^(-1)(or Omega^(-1)cm^(2)mol^(-1))` |
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| 8100. |
Which of the following compound can not show haloform reation ? |
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Answer»
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