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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.
| 16101. |
Which of the following is not a major constituent of air pollutants ? |
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Answer» OXIDES of sulphur |
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| 16102. |
Write the IUPAC name of [Pt(NH_(3))_(2)(H_(2)O)Cl_(2)) |
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Answer» SOLUTION :`[Pt(NH_(3))_(3)(H_(2)O)(Cl_(2))]` IUPAC Name : triammine aquadichlorido PLATINUM (II). |
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| 16103. |
Which of the following has maximum magnetic moment? |
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Answer» `Mn^(2+)(Z=25)` |
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| 16104. |
Which of the following pairs is not correctly matched: |
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Answer» A halogen which is LIQUID at ROOM TEMPERATURE - bromine |
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| 16105. |
Which configuration represents a coinage metal? |
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Answer» 2,8,8,3 |
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| 16106. |
Which of the following is not a broad spectrum antibiotic? |
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Answer» Tetracycline |
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| 16107. |
There are three outcome of a substitution reaction at an asymmetric carbon of alkylhalide. Explain |
| Answer» Solution :If substitution is on the same SIDE of leaving GROUP retention of CONFIGURATION occurs and on OPPOSITE side inversion of configuration occurs. If a 50:50 mixture of the two is obtained, the process is called RACEMISATION | |
| 16109. |
The structure of NaCl crystal is: |
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Answer» BODY centred |
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| 16110. |
Which of the 3d series of elements exhibits the largest number of oxidation states. Why? |
| Answer» Solution :Mn shows the MAXIMUM NUMBER of oxidation states. This is because of its outer electronic configuration, `3d^5 4s^2` Since there is not much ENERGY difference between 3d and 45, it uses its 3d electrons also for bonding. So Mn shows all oxidation states from `+2` to `+7`. | |
| 16111. |
What causes Brownian movement in colloidal solution ? |
| Answer» SOLUTION : It is the unbalanced BOMBARDMENT of MOLECULES of DISPERSED PHASE by molecules of dispersion medium which causes Brownian movement. | |
| 16112. |
When 1 mole of a solute is dissolved in 1kg of H_(2)O boiling point of solution was found to be 100.5^(@)C K_(b) for H_(2)O is |
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Answer» `0.5` |
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| 16113. |
When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_(3) dissolves. O and gives an intense blue solution QThe metal rod Mis |
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Answer» Fe While Cu partially oxidizes to `Cu(NO_(3))_(2)`, and remaining `AgNO_(3)` reacts with NacI |
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| 16114. |
Which of the following metal does not react with the solution of copper sulphate |
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Answer» Mg |
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| 16116. |
When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_(3) dissolves. O and gives an intense blue solution QThe compound N is |
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Answer» `AgNO_(3)` |
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| 16117. |
When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_(3) dissolves. O and gives an intense blue solution QThe final solution contains |
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Answer» `[PB(NH_(3))_(4)]^(2+)and[CoCl_(4)]^(2-)` `AgCl+2NH_(3)to[Ag(nH_(3))_(2)]^(+)]Cl^(-)` Cu(NO_(3))_(2)+4NH_(4)OHto{Cu(NH)_(3))_(4)]^(2+)` |
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| 16118. |
Which oxide of nitrogen is obtained on heating ammonium nitrate at 250^(@)C? |
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Answer» `N_(2)O` |
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| 16119. |
Which of the following molecular species has unpaired electron(s)? |
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Answer» `N_(2)` |
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| 16120. |
Which of the following compounds can be regenrated to carbonyl compounds ? |
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Answer» UROTROPIN |
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| 16121. |
Unit of the rate of reaction is mol^-1sec^-1 |
| Answer» SOLUTION :MOLES`liter^-1sec^-1` or moles `liter^-1mol^-1` | |
| 16122. |
Vapour pressure of pure 'A' is 70 mm of Hg at 25^(@)C. It forms an ideal solution with 'B' in which mole fraction of A is 0.8 . If the vapour pressure of the solution is 84 mm of Hg at 25^(@)C, the vapour pressure of pure 'B' at 25^(@)C is : |
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Answer» 56 mm `=p_(A)^(@)x_(A)+p_(B)^(@)x_(B)` `p_(A)^(@)=70` mm HG, `x_(A)=0.8` `p_(B)^(@)=? "" x_(B)=1-x_(A)=0.2` `p_("total")=84` mm Hg. `:.84=(70xx0.8)+(p_(B)^(@)xx0.2)` `84=56+0.2 p_(B)^(@)` `0.2p_(B)^(@)=84-56=28` or `p_(B)^(@)=(28)/(0.2)=140` mm Hg. |
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| 16123. |
Zinc is the only metal in group -12 which shows amphoteric properties and is soluble in alkaline forming |
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Answer» `Na_(2)[Zn(OH)_(4)]` The zincate and metazincates are represented as `[Zn(OH)_(4)]^(2-),[Zn(OH)_(3)(H_(2)O)_(3)]^(-),[Zn(OH)_(3)H_(2)O]^(-)` Hence, choce (a), (b) and (c ) are correct while (d) is INCORRECT. |
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| 16124. |
With which one of the pollutant gases in air, haemoglobin of blood undergoes irreversible chemical combination thus causing death. The gas is : |
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Answer» CARBON monoxide |
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| 16125. |
Under what circumstances may an aldehyde be prepared by oxidation of primary , alcohol, with acid dichromate ? |
| Answer» Solution :If the aldehyde product is more vilatilethan the reactant ALCOHOL and `H_(2)O`, it may be removed from the REACTION mixture by distillation as soon as it is FORMED | |
| 16126. |
Which class of drugs is used in sleeping pills ? |
| Answer» SOLUTION :TRANQUILIZERS. | |
| 16127. |
When semicarbazide reacts with a ketone (or aldehyde) to form semicarbazone. Only one nitrogen atom of semicarbazide acts as a nucleophile and attack the carbonyl carbon of the ketone. The product fo the reaction consequently is R_(2)C=N- NH-CONH_(2) rather than R_(2)C=NCONH-NH_2. what factor account for the fact that two nitrogen atoms of semicarbazide are relatively non nucleophilic ? |
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Answer» |
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| 16128. |
Which of the following has the highest percentage of carbon ? |
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Answer» STAINLESS steel |
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| 16129. |
Which one of the following inhibits bacterial enzyme DNA gyrase? |
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Answer» DOXY cycline |
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| 16130. |
The structure of geometrical isomer of Gutta-Percha ? |
| Answer» | |
| 16132. |
What does ABS stand for ? |
| Answer» Solution :ABS stand for ACRYLONITRILE (A), Butadiene (B) and STYRENE (S). | |
| 16133. |
Which of the following aldohexoses give the same osazone derivative ? |
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Answer» I and IV |
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| 16134. |
Which of the following character is not shown by the transition metals |
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Answer» VARIABLE valency |
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| 16135. |
Which of the following reactions produce Cl_(2) gas : |
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Answer» `PbO_(2) + HCl RARR` `2KClO_(3) + I_(2) rarr 2KIO_(3) + Cl_(2)` |
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| 16136. |
Though a transition element, scandium (Z = 21) does not exhibit variable oxidation state. |
| Answer» Solution :Sc does not EXHIBIT variable oxidation states because it only CONTAINS three valence ELECTRONS `(3d^(1) 4s^2` CONFIGURATION).After losing these electrons, Sc acquires stable NOBLE gas configuration. | |
| 16137. |
Which among the hydrides of group 17 elements is: (i) most volatile (ii) most stable (iii) strongest reducing agent? |
| Answer» SOLUTION :`(i) HCl (ii) HF (III) HI` | |
| 16139. |
Which of the metal carbonates is most stable thermally? |
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Answer» `MgCO_(3)` |
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| 16140. |
The solution containing 6.8g of non-ionic solute in 100g of water was found to freeze at - 0.93^@C. If K_f for water is 1.86, the molar Mass of solute is |
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Answer» 13.6 |
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| 16141. |
The value of (x)/(m) does not increase rapidly with the increase in value of p in Freundlich adsorption isotherm because..... |
| Answer» SOLUTION :`ngt1` | |
| 16142. |
Which of the following is the emulsion of water in oil ? |
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Answer» VANISHING cream |
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| 16143. |
Which metal sulphide is soluble in excess NH_3 solution? |
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Answer» Zns |
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| 16144. |
Which of the following is most acidic ? |
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Answer»
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| 16145. |
Why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides? Explain |
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Answer» Solution :This is due to the following reasons: (i) Haloarene involves resonance. eg. consider chloro berizene. It has 5 resonating structures.  Haloalkane has only one structure eg. `CH_(3)-Cl`. `:.` Haloarenes are more STABLE. (ii) `"In Haloarene" = overset(SP^(2))overset(|)C-X` bond is lens POLAR than in haloalkanes. (III) In haloarene  bond length is less than in haloalkanes
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| 16146. |
What is meant by positive and negative deviation from Raoult's law ? |
| Answer» Solution :If the vapour pressure of a solution is higher than expected, it is called POSITIVE deviationfrom Raoult.s LAW. If the vapour pressure of a solution is LOWER than expected, it is called NEGATIVE deviationfrom Raoult.s law. | |
| 16147. |
What are 12—16 and 13—15 compounds ? |
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Answer» Solution :12–16 COMPOUND. A binary compound MADE up of elements of group 12 and group 16 is called 12– 16 compound 13—15 Compound. A binary compound made up of elements of group 13 and group 15 is called 13—15 compound |
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| 16148. |
Treatment of sodium salt of phenol with carbon dioxide under pressure brings about substitution of the carboxyl group, -COOH, for hydrogen of the ring. This provides a path of conversion of phenol into hydroxy carboxylic acids. The acids formed are industrially very important compounds and form many useful compounds. What is the name of the reaction? |
| Answer» SOLUTION : Kolbe.s REACTION. | |
| 16149. |
Total number of isomeric molecules obtained on dichlorination of cyclopentane |
Answer» 
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| 16150. |
Which cells were used in the Apollo space program? What was the product used for? |
| Answer» Solution :`H_(2)-O_(2)` FUEL CELL. The product `H_(2)O` was used for DRINKING by the astronauts. | |
