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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.
| 21101. |
which of the following sets of ions has the magnetic moment equal to sqrt15, sqrt35, sqrt24 and 0 respectively? |
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Answer» `Mn^(4+), Fe^(3+), Cr^(2+), Cu^+` |
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| 21102. |
Which of the following is used during world war as gas masks? |
| Answer» Solution :Charcoal | |
| 21103. |
Which of the following inter-halogen compounds does not exist ? |
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Answer» `IF_(7)` |
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| 21104. |
Towards electrophilic substitution, the most reactive will be |
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Answer» nitrobenzene |
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| 21105. |
Which of the following is/are correct for a nuclear reactor ? |
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Answer» A typicalfissionis representedby` ""_(92)^(235 )U +""_(0)^(1)n toKr` + ENERGY |
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| 21106. |
Which type of detergent is cetyl trimethyl ammonium chloride ? |
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Answer» Anionic |
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| 21107. |
Which of the d - orbital is used in sp^(3)d hybridization ? |
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Answer» `d_(xy)` |
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| 21108. |
Which of the following statement(s) is are/correct |
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Answer» Aplot of log K vs `1/T` is linear (T is temperature) |
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| 21109. |
What is the number of mole(s) of H_(2)(g) required to saturate one mole benzene ? |
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Answer» 1 |
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| 21110. |
What is meant by chemisorption ? |
| Answer» Solution :When the force of attraction EXISTING between adsorbate and adsorbent are ALMOST of the same strength as chemical BONDS, the ADSORPTION is called chemical adsorption also known as chemisorption. | |
| 21111. |
What are non ideal solutions ? Explain non ideal solutions with positive deviation and those with negative deviation. |
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Answer» Solution :When a solution does not obey Raoult.s law over the entire range of concentration, then it is called non - ideal solution. The vapour pressure of such a solution is either higher or lower than that predicted by Raoult.s law. If it is higher, the solution exhibits positive deviation and if it is lower, it exhibits negative deviation from Raoult.s law.  In case of positive deviation from Raoult.s law, A - B interactions are weaker than those between A - A or B - B, i.e., in this case the intermolecular attractive forces between the solute - solvent molecules are weaker than those between the solute - solute and solvent - solvent molecules. This means that in such solutions, molecules of A (or B) will find it EASIER to ESCAPE than in pure state. This will increase the vapour pressure and result in positive deviation. Example : Mixtures of ehanol and acetone. In pure ethanol, molecules are hydrogen bonded. On adding acetone, its molecules get in between the host molecules and break some of the hydrogen BONDS between them. Due to weakening of interactions, the solution shows positive deviation from Raoult.s law. Another example : `CS_(2)` and Acetone Negative deviation :  In case of negative deviations from Raoult.s law, the intermolecul arattractive forces between A - A and B - B are weaker than those between A - B and leads to decrease in vapour pressure resulting in negative deviations. Example : (i) Mixture of phenol and aniline. In this case the intermolecular hydrogen bonding between phenolicproton and lone pair on nitrogen atom of aniline is stronger than the respective intermolecular hydrogen bonding between similar molecules. (ii) A mixture of chloroform and acetone forms a solution with negative deviation from Raoult.s law. This is because chloroform MOLECULE is able to form hydrogen bond with acetobne molecule as shown.  This decreases the escaping tendency of molecules for each component and consequently the vapour pressure decreases resulting in negative deviation from Raoult.s law. |
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| 21113. |
Which redical can bring about the highest oxidation state of a transition metal ? |
| Answer» ANSWER :C | |
| 21114. |
The relationship between standard reduction potential of a cell and equilibrium constant is shown |
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Answer» `E_("cell")^(0) = (N)/(0.059) log K_(c)` |
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| 21115. |
What are isotonic solutions ? Give one example . |
| Answer» Solution :SOLUTIONS having EQUAL OSMOTIC pressure are CALLED isotonic solutions, e.g., 0.1 M glucose and 0.1 M sucrose solutions. | |
| 21116. |
Which of the following is not correct regarding the adsorption of a gas on the surface of a solid? |
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Answer» On increasing TEMPERATURE, adsorption increases continuously |
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| 21117. |
Which of the following is not the biopolymer ? |
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Answer» Protein |
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| 21118. |
Which of the following will not give a primary amine ? |
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Answer» `CH_(3)CONH_(2)overset(KOH Br_(2))rarr`<BR>`CH_(3)Cnoverset(LiAIH_(4))rarr` |
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| 21119. |
Which type of extrinsic semiconductor is formed when silicon is dopped with phosphorus? Mention the major charge carrier in it. |
| Answer» SOLUTION :n-type, ELECTRON(s). | |
| 21120. |
Which of the following catalyst is used in the polymerisation of CH-=CH to C_6H_6 |
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Answer» `AlCl_3` 
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| 21121. |
What is hydrometallurgy? Explain with an example. |
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Answer» Solution :The process of extraction of metals by dissolving the ore in a suitable chemical reagent and the precipitation of the metal by more electropositive metal is called hydrometallurgy. For example, concentrated argentite, Ag2S is first treated with a dilute solution of NaCN to form the soluble complex, sodium dicyanoargentate (I). `Ag_2S + 4NaCN to underset(("Soluble"))underset("Sodium dicyano argentate (I)")(2Na[Ag(CN)_2]) + Na_2S` The solution is decanted off and made alkaline by adding NaOH and then treated with ZINC or ALUMINIUM to precipitate silver. `2Na[Ag(CN)_2] + Zn to underset("Silver")(2Ag) +underset("Sodium tetracyanozincate (II)")(Na_2[Zn(CN)_4])` `Na_2[Zn(CN)_4]+ 4NaOH to Na_2ZnO_2 + 4NaCN` Gold is ALSO precipitated from its complex salt solution in a similar way. `2K[Au(CN)_2] + Zn to K_2[Zn(CN)_4]+ 2Au` Metals such as Ti, Zr, Ta, etc, are also obtained by reducing their complex salts with alkali metals or Al. `K_2TiF_6 + 4K to 6KF + Ti` `K_2ZrF_6 + 2Al to 2AlF_3 + 2K + Zr` |
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| 21122. |
Which of the following conditions is/are favourablefor the feasibility of a reaction ? |
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Answer» `DELTAH= +ve, TDeltaS = +ve and TDeltaS lt DeltaH` ` DeltaG = DeltaH -TDeltaS = -ve ` In all three CASES(a,b,c) ` DeltaG `is negative but in option(d), `DeltaG ` is POSITIVE which is notfavourablefor the feasiblity of the reaction |
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| 21123. |
What is retention and inversion of configuration ? Explain with suitable example. |
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Answer» Solution :If in a CHEMICAL reaction, no bonds to the stereocentre (chiral centre) are broken, the product will have the same general configuration of the groups around the stereocentre as that of reactant. Such a reaction is said to proceed with the RETENTION of configuration. Thus, the preservation of the spatial arrangment of bonds to an asymmetric centre during a chemical reaction is called retention of configuration. Consider an example of the reaction that takes place when (-) -2-methylbutan-1-ol is heated with hydrochloric acid (conc.) However, if in a product, the atom occupies the opposite position to the REPLACED ligand at a chiral center, it is known as inversion of configuration.  The configuration at asymmetric center in the reactant and product is same but the sign of the optical rotation has changed in the product. This is because the two different compounds with same configuration at asymmetric center may have different optical rotation. One may be DEXTROROTATORY while other may be laevorotatory. |
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| 21124. |
The standard reduction potential at 298 K for the following half cell reaction are Zn^(2)(aq) + 2e rarr Zn(s)E^@ = -0.762 V Cr^(3+)(aq) + 3e rarr Cr(s)E^@ = 0.740 V 2H^+(aq)+ 2e rarr H_2(g)E^@ = 0.0V F_2(g) + 2e rarr 2F^(-) (aq)E^@ = 2.87 V Which of the following is strongest reducing agent ? |
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Answer» `Cr_(s)` |
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| 21125. |
Which of the following belongs to the halogen family? |
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Answer» Fr |
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| 21126. |
The volume of 1 mole of a gas at NTP is 20 litres. |
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Answer» The GAS is IDEAL |
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| 21127. |
Which of the following has magnesium ? |
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Answer» Carbonic ANHYDRASE |
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| 21128. |
The resistance of a conductivity cell is measured as 190 Omega using 0.1 K KCl solution (specific conductance of 0.1 M KCl is 1.3 Sm^(-1)). When the same cell is filled with 0.003 M sodium chloride solution, the measured resistance is 6.3 Omega . Both these measurement are made at a particular temperature. Calculate the specificc and molar conductance of NaCl solution. |
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Answer» Solution :GIVEN that `k = 1.3 Sm^(-1)` (for 0.1M KCl solution) `R = 190 Omega` `(l/A) = k.R = (1.3 Sm^(-1))(190 Omega) = 247 m^(-1)` `k_(NACL) = 1/(R_((NaCl))) (l/A) = 1/(6.3 KQ) (247 m^(-1)) "" 6.3K Omega = 6.3 xx 10^(3) Omega` `= 39.2 xx 10^(-3) Sm^(-1)` `Lambda_m = (k xx 10^(-3) mol^1 m^3)/(M) = (39.2 xx 10^(-3)(Sm^(-1)) xx 10^(-3)(mol^(-1)m^3))/(0.003)` `Lambda = 13.04 xx 10^(-3) Sm^(-2) mol^(-1)` . |
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| 21129. |
Which of the following is responsible for depletion of the ozone layer layer in the upper strataof the atomosphere |
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Answer» FULLERENCES |
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| 21130. |
What is oleum ? What is the oxidation state of sulfur in it? |
| Answer» Solution :`H_2S_2O_7`formed by the DISSOLUTION of `SO_3`in `H_2SO_4`. Oxidation STATE of SULFUR in OLEUM is + 6. | |
| 21131. |
The velocity of a reaction is tripled for every 10^(@)C rise in temperature. If temperature is raised by 120^(@)C then the velocity increases by x times. Where (x)/(59049) is equals to |
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Answer» |
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| 21132. |
The relation between nucleotide triplets and the amino acids is called as |
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Answer» Gene |
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| 21133. |
Which one of the folowing is used in hard water ? |
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Answer» POTASSIUM Stearate |
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| 21135. |
Two functional group that are present in all amino acids are the |
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Answer» hydroxy, amine |
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| 21136. |
Which arrangement for the three halogens Cl, Br and I is correct in the order of their increasing electron affinity : |
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Answer» CL, BR, I |
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| 21137. |
What is a nucleoside ? |
| Answer» Solution :A nucleoside consists of two components, i.e., a NITROGENOUS base ( PURINE or pyrimidine) and a five carbon SUGAR (ribose or deoxyribose). It is OBTAINED when the nitrogenous base is attached to `C_1` of sugar by a `beta` -linkage. Thus , in general , a nucleoside may be represented as : Base -Sugar of nucleosides are adenosine , CYTIDINE etc. | |
| 21138. |
What is the principle used in secondary batteries to regenerate the original reactants? |
| Answer» Solution :Electrochemical reactions which take place in a GALVANIC cell may be REVERSED by applying a potential slightly greater than the emf gereated by the cell. This principle is USED in secondary batteries to regenerate the ORIGINAL REACTANTS. | |
| 21139. |
Which of the following is the most reactive towards electrophilic attack? |
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Answer»
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| 21140. |
The standard free energy change (DeltaG^(@)) is related to equilibrium constant (K) as |
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Answer» `DeltaG^(@)=-2.303` RT log K `=-2.303 RT " log K"`. |
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| 21141. |
Which of the two have almost similar size |
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Answer» `""_(22)Ti "and" ""_(40)Zr` |
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| 21142. |
What is enzyme catalysis ? |
| Answer» Solution :Enzymes are complex NITROGENOUS organic COMPOUNDS which are PRODUCED by living plants and animals. They are very effective catalysts. Catalysis that involves the use of these enzymes is called ENZYME catalysis. | |
| 21143. |
Which amide will be most reactive for Hofmann- bromamide rearrangement? |
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Answer» `CH_(3)-CH_(2)-OVERSET(O)overset(||)C-NH_(3)` |
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| 21145. |
The reagent is used in the conversion of 1-butanol to 1-bromobutane is : |
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Answer» `CHBr_3` |
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| 21146. |
Which of the following element have the similar value of electronegativity? |
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Answer» H |
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| 21147. |
What is product formed when cyclohexane carbaldehyde undergoes aldol condensation ? |
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Answer»
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| 21148. |
Transition metals are placed in the long from of periodic table between : |
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Answer» 3RD and 4TH group |
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| 21149. |
Which of the following is not present in dettol ? |
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Answer» terpineol |
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| 21150. |
Which of the followig is false? |
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Answer» Saline water slows down rusting `Zn+Cu^(2+)toZn^(2+)+Cu,E_(cell)=E_(cell)^(@)-(0.0591)/(2)"log"([Zn^(2+)])/([Cu^(2+)])` If `[Zn^(2+)]` and `[Cu^(2+)]` are doubled, there is no effect on EMF, hence (B) is wrong. |
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