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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.
| 8101. |
When Cl_2 is added to an aqueous solution of potassium halide in presence of chloroform a violet colour is obtained. On adding more of Cl_2 water, the violet colour disappears and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution: |
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Answer» Iodide |
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| 8102. |
Which of the following is correct? (i) The smallest alkene which can show optical isomerism possesses 7 carbon atoms (ii) The smallest alkanes which can exist in the enantiomertic forms are -2-methy1lexane and 2,3-dimethy 1pentane (iii) The smallest alkane which has a meso steroisomer possesses 6 carbons (iv) 3,4-Dimethy1lexane has a mseo steroisomer. |
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Answer» (i)and (III)  Smallest alkane having a MESO steroisomer CONTAINS two identical asymmetric carbon atoms: 
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| 8103. |
Which of the following halogen-exchanged reaction is possible? |
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Answer» `R-I +NACL to ` |
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| 8104. |
Under what conditions will the following reactions go in the forward direction? N_(2)(g)+3H_(2)(g)hArr2NH_(3)(g)+23Kcal |
| Answer» SOLUTION :LOW T, HIGH P, excess of `N_(2)` and `H_(2)` . | |
| 8105. |
What are rare earths ? |
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Answer» Solution :(1) Lanthanoids or 4f- BLOCK elements are CALLED rare earths. (2) Lanthanoids are never found in free state, and they are available on small SCALE. Therefore they are called rate earths. |
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| 8106. |
Tincture of lodine is |
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Answer» Aqueous solution of `I_(2)` (B) |
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| 8107. |
What are clathrate compounds of noble gases? |
| Answer» Solution :CLATHRATE compounds are the compounds obiained by TRAPPING the atoms of NOBLE gases in the crystal LATTICES of ORGANIC molecules such as phenol, hydroquinone, etc | |
| 8108. |
Which of the following oil is obtained from benzene after fractional distillation of coal tar |
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Answer» Light OIL |
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| 8109. |
Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be |
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Answer» Solution :`underset(underset(t=t)(t=0))("")underset(underset(0)(20mL))(NH_(3)(g))+underset(underset(20mL)(40ML))(HCl(g)) to underset(underset("solid")(0))(NH_(4)Cl(g))` Final volume = 20 mL |
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| 8110. |
Which of the following are intermediates in the acid-catalysed reactionof benzaldehyde 2 equivalents of methanol to give benzaldehyde dimethyl acetal? |
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Answer»
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| 8111. |
The reduction of Fe_(2)O_(3) to Fe by CO occurs arround __________. |
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Answer» 873 K |
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| 8112. |
Which of the following is not a hydride: |
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Answer» HCL |
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| 8113. |
What is meant by condensation polymerization? |
| Answer» Solution : Condensation POLYMERIZATION is the type of polymerization in which two or more bifunctional molecules undergo a series of condensation reactions RESULTING in the elimination or removal of simple molecules such as `H_2O , NH_3 , CH_3OH` etc. For example, Dacron-a polyester is PRODUCED by SUCCESSIVE condensation of ETHYLENE glycol and terephthalic acid or its methyl ester molecules. | |
| 8114. |
There are three disaccharides A, B and C. The hydrolysis products of 'A'are functional isomers and of 'B'are epimers. But the hydrolysis products of 'C' are neither epimers nor functional isomers. Then what are A, B and C? |
| Answer» Solution :Disaccharide .A. is sucrose. It gives glucose and FRUCTOSE UPON hydrolysis. Disaccharide .B. is Lactose. It gives glucose and GALACTOSE upon hydrolysis. .C. is maltose. It gives two glucose molecules upon hydrolysis. | |
| 8115. |
Which of the following is a gas at room temperature? |
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Answer» `CH_3OCH_3` |
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| 8116. |
Write the equation for Cl_2 which is bubbled through a solution of ferrous bromide. |
| Answer» SOLUTION :`2FeBr_2 + 3Cl_2 RARR 2FeCl_3 + 2Br` | |
| 8117. |
Which halide of nitrogen is least basic? |
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Answer» `NF_3` |
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| 8118. |
Which of the following compounds will not undergo elimination reaction in preence of C_(2)H_(5)O^(Θ)Na^(+)//C_(2)H_(5)OH ? |
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Answer» ISOBUTYL bromide 
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| 8119. |
Write the structures the major products expected from the following reactions : (a) Mononitration of 3-methylphenol (b) Dinitration of 3-methylphenol (c) Mononitration of phenyl methanoate. |
Answer» Solution :The combined influence of -OH and `-CH_(3)` groups determine the position of the incoming GROUP.
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| 8121. |
The temperature of the slag zone in the metallurgy of iron using blast furnace is |
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Answer» `1500-1600^(@)C` `CaO_(3)overset(1000^(@)C)(to) CaO+CO_(2)` CaO acts as a flux as it combines with silica present as an impurity (gangue) t form a fusible slag of `CaSiO_(3)` `CaO+SiO_(2)overset(1000^(@)C)(to)UNDERSET("Slag")(CaSiO_(3))` |
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| 8123. |
Which of the following B-group vitamins can be stored in our body ? |
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Answer» Vitamin `B_(1)` |
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| 8124. |
Two inorganic compounds A and B were heated in a dry test tube. A evolved a colourless gas which turned lead acetate paper black and B evolved a gas which turned lime water milky. The anions in A and B respectively are : |
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Answer» `SO_(3)^(2-), CO_(3)^(2-)` |
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| 8125. |
X% of C is present in steel X is |
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Answer» |
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| 8127. |
Zoverset(PCI_5)rarrX overset(Alc.KOH)rarrY overset(1.conc.H_2SO_4)underset(2.H_2O:boil)rarrZ is : |
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Answer» `CH_3-CH_2-CH_2-OH` |
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| 8128. |
Which cell will measure standard electrode potential of copper electrode? |
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Answer» `Pt(s)|H_(2)(g,0.01" BAR")|H^(+)(aq.,1M)||Cu^(2+)(aq.,1M)|Cu` |
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| 8129. |
Whichof the followingis secondary amine ? |
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Answer» Sec.butylamine |
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| 8130. |
What is the role of HNO_(3) in the nitrating mixture used for nitration of benzene ? |
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Answer» |
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| 8131. |
What is the action of nitrous acid on ethyl amine ? |
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Answer» Solution :REACTION of an amine with nitrous acid(HO - N =O)is the distinguishing test between primary, secondary and tertiary amines as they react differently with nitrous acid. Nitrous acid is unstable, hence prepared instantly by the action of cold, dilute, hydrochloric acid on sodium nitrite. `underset("Sodium nitrite")(NaNO_(2)) + HCI overset("cold")underset("dil.")to NaCI + underset(" nitrous acid")(HNO_(2))` (1) Action of nitrous acid on primary amine : All primary amines, except methly amine react withnitrous acid in cold to give alcohol and liberate nitrogen gas. For example, ethyl amine on reaction with nitrous acid in cold, forms ethyl alcohol and nitrogent gas. `underset("ethylamine")(C_2H_5 -NH_2)+underset("nitrous acid")(HO-N=O) overset(NaNO_(2)+ " dill. HCI")underset("cold")to underset("ethyl alcohol")(C_(2)H_(5)-OH)H_(2)O+underset("nitrogen gas")(N_(2))` (2) Action of nitrousacid on secondary amines : Tertiary amine on reaction with nitrous acid forms N-nitrosoamine which is a pale yellow oil. Forexample, diethyl amine on reaction with nitrous acid in cold froms pale yellow oily N-nitrosodiethylamine. `underset("diethylamine")((C_(2)H_(5))_(2)NH)+H-O-H=O overset(NaNO_(2)+ " dil.HCI") underset("cold")to underset("N-nitrosodiethylamine")((C_(2)H_(5))_(2)N-N=O + H_(2))O` (3) Action of nitrous acid on tertiary amines , Tertiary amine on reaction with nitrous acid forms water - soluble nitrite salt. As no visible change , is OBSERVED , it is said that there is no reaction. For example, TRIETHYLAMINE reacts with nitrous acid in cold and forms water soluble triethyl ammonium nitrite salt. `underset("triethyaminenitrous acid")((C_(2)H_(5))_(3)N+HO-N=O) overset(NaNO_(2)+ " dil. HCI")underset("cold")to underset("triethyl ammonium nitrite")([(c_(2)H_(5))_(3)NH^(+)]NO_(2)^(-))` |
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| 8132. |
Which of the following statements concern with transition metals ? |
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Answer» compounds containing IONS of transition elements are USUALLY coloured |
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| 8133. |
Which of the following is a basic dye |
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Answer» Indigo |
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| 8134. |
Which statement is true for ferrocene ? |
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Answer» All Fe-C are of equal LENGTH 
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| 8135. |
Alkali hydrolysis of ester is a first order reaction .is it true or false |
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Answer» `NH_4NO_2rarrN_2+2H_2O` |
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| 8136. |
Which of the following has the dimension of ML^(0)T^(-2)? |
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Answer» Coefficient of viscosity `FimpliesM^(1)L^(1)T^(-2),M^(0)L^(1)T^(0)` `gamma=(M^(1)T^(1)T^(-2))/(M^(0)L^(1)T^(0))=M^(1)L^(0)T^(-2)` |
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| 8137. |
The surface tension of lyophilic sol is .. . |
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Answer» more than `H_(2)O` |
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| 8138. |
Write the law for the following reactions . (a) A reaction that is 3/2 order in x and zero order in y . (b) A reaction that is second order in NO and first order in Br_2 . |
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Answer» SOLUTION :(a) `3/2x+y` (excess) `rarr` PRODUCTS `-3/2(d[x])/(DT)=K[x]^(3//2)` (b) 2NO+`Br_2 rarr` Products `-/2(d[NO])/(dt)=k[NO]^2[Br_2]` |
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| 8139. |
Which of the following form acidic halides |
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Answer» HF |
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| 8140. |
When a current of 1.5 amp was passed for 30 minutes through a solution of a salt of a trivalent metal, 1.071 g of the metal was deposited at the cathode. Calculate the atomic weight of the metal. |
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Answer» Solution :Charge passed through the solution `= 1.5 xx 30 xx 60` = 2700 COULOMBS. Mole of electric charge passed `= (2700)/(96500)` faraday `= (27)/(965)F`. `therefore` EQUIVALENT of the metal deposited `= (27)/(965)`. Let the at. Wt. of the metal be X. `therefore` eq. wt. of the metal `= (x)/(3)`. `"" (because "valency of the metal = 3")` `therefore` weight of the metal deposited = no. of eq. `xx` eq. wt. `= (27)/(965) xx (x)/(3)g`. `therefore` as given, `(27 xx x)/(965 xx 3) = 1.071` x = 114.8 amu. |
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| 8141. |
What is Buna-S ? |
| Answer» SOLUTION :It is a COPOLYMER of 1,3-butadiene and STYRENE in the RATIO of 3:1. | |
| 8142. |
Which of the following attraction is strongest? |
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Answer»
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| 8143. |
Which one of the following oxides is expected to exhibit paramagnetic behaviour? |
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Answer» `CO_(2)` |
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| 8144. |
What are the drugs called that kill or inhibit the growth of microorganisms which cause bad effect to wounds or injury ? |
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Answer» Tranquilizers |
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| 8145. |
Whch of the following complex is an outer orbitals complex? |
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Answer» `[Ni(NH_(3))_(6)]^(2+)` |
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| 8146. |
When copper ore is mixed with silica in a reverberatory furnace, copper matte isproduced, The copper matte contains_______ :- |
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Answer» Sulphides of copper (II) and IRON (II) |
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| 8147. |
Which of thefollowing aldehydes does not reduce fehling solution readily |
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Answer» BENZALDEHYDE |
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| 8148. |
Which of the following is least reactive in a nucleophilic substitution reaction ? |
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Answer» `(CH_(3))_(3)C-Cl` 
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| 8149. |
Which forms dimer ? |
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Answer» `BCl_3` |
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| 8150. |
Which of the following M^(2+) is not a stable oxidation state ? |
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Answer» `GD ^(3+)` |
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