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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.
| 14501. |
The total number of isomer possible for the formula C_4H_10 is: |
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Answer» 3 |
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| 14502. |
Which ofthefollowingstatementsare correct ? |
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Answer» A depressancepreventscertaintype ofparticle tocometothefroth |
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| 14503. |
Which of the following occurs at low temperature? |
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Answer» ADSORPTION of `O_(2)`, on tungsten |
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| 14504. |
The simplext formula of a compound containng 50% of element X (At. Mass=75) and Y(At. Mass=16) combine to give a compound having 75.8% of X. the formula of the compound is: |
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Answer» XY |
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| 14505. |
Which is not ferromagnetic ? |
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Answer» Fe |
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| 14506. |
Which of the following oxidation reaction can be carried out with chromic acid in aqueous acetone at 5 - 10(@) C? |
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Answer» `CH_(3)(CH_(2))_(3)C-=C-underset(OH)underset(|)(CH)-CH_(3)to CH_(3)(CH_(2))_(3)-=C-overset(O)overset(||)(C)-CH_(3)` WHITE turbidty only heating `2(@)` Alcohol `overset(ZnCL_(2)//HCl) to` White turbidty after `5 min` heating `3(@)` Alcohol `overset(ZnCL_(2)//HCl) to` easily in seconds |
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| 14507. |
What type of drugs kill or arrest the growth of microorganism ? |
| Answer» SOLUTION :ANTISEPTIC | |
| 14508. |
Which of the following polymers do not involve crosslinkages? |
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Answer» Melmac |
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| 14509. |
Which of the followingmethod is usedto convert Ketone into hydrocarbon ? |
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Answer» ALDOL Condensation |
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| 14510. |
Which of the following characteristic features match(es) with the crystal systems: cubic and tetragonal? |
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Answer» Both have the cell PARAMETERS a = b = c and `alpha=beta=gamma` |
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| 14511. |
Which hydrocarbon is formed when aluminium carbide is reacted with water or dilute HCl? |
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Answer» METHANE |
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| 14512. |
Which property is not characteristic of alkali metal halides ? |
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Answer» HIGH MELTING point |
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| 14513. |
What are the properties of inter halogen compounds ? |
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Answer» (i) The central atom will be the larger one. (ii) It can be formed only between two halogen and not more than two halogens. (iii) Fluorine can't act as a central metal atom being the smallest one. (iv) Due to HIGH ELECTRONEGATIVITY withsmall size fluorine HELPS the central atom to attain high coordination number. (v) They can UNDERGO the AUTO ionization. `2ICI hArr I^(+)+ICI_(2)^(-)` `2ICI_(3) hArr ICI_(2)^(+)+ICI_(4)^(-)` |
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| 14514. |
Which of the following compound will have the smallest pK_(a) value ? |
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Answer» BENZOIC acid |
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| 14515. |
what is the correct order of the reactivity of the following compounds towards nucleophilic substitution reaction. |
| Answer» SOLUTION :(d)GT(C)gt(E)gt(B)gt(a). | |
| 14516. |
Which statement about noble gases is not correct: |
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Answer» Xe forms `XeF_6` |
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| 14517. |
When electric current is passed through a cell having an electrolyte, the positive ions move towards the cathode and the negative ions towards the anode. If the cathode is pulled out of the solution: |
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Answer» The POSITIVE and NEGATIVE ions will move towards the anode |
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| 14518. |
Why are lower members of aldehydes easily soluble water? |
| Answer» SOLUTION :DUE to INTERMOLECULAR HYDROGEN BONDING. | |
| 14519. |
The size of the trivalent cations in the lanthanoid series decrease steadily as the atomic number increases. What is this known as ? |
| Answer» SOLUTION :LANTHANOID CONTRACTION. | |
| 14520. |
Which one of the following is expected to have maximum viscosity at a given temperature? |
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Answer» ACETIC acid |
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| 14521. |
What is meant by the following terms ? Give an example of the reaction in the case. i. Cyanohydrinii. Actal iii. Semicarbazoneiv. Aldol v. Hemiacetalvi. Oxime vii. Ketalviii. Imine ix. 2,4-DNP derivativex. Schiff's base |
Answer» Solution :i. Cyanohydrin: Compounds containing (OH) group and (CN) group on the same C atom are CALLED cyanohydrin or gem-hydroxy nitriles. They are obtained by the addition of HCN to carbonyl compounds in weakly basic medium. They are used to prepare `alpha`-hydroxy acid, e.g., lactic acid. ii. Acetal: Compounds containing TWO alkoxy (OR) groups on the same C atom are called acetal or gem-dialkoxy compounds. They are obtained by the reaction of aldehydes with 2 mol of monohydric ALCOHOL in the presence of dry HCI GAS.  They are hydrolysed easily in acidic medium to regenerate original aldehydes. Hence, they are used to protect aldehyde group in the synthesis of various organic compounds. iii. Semicarbazone: They are ammonia derivaties of carbonyl compounds and are obtained by the reaction of semicarbazide with carbonyl compounds in weakly acidic medium. They are used for the identification and characterisation of carbonyl compounds.  iv. Aldol: Aldol is an abbreviation of aldehyde and alcohol. It is a `beta`-hydroxycarbonyl compound obtained by the condensation of an aldehyde or a keton. v. Hemiacetal: Compounds containing one alkoxy group (OR) are called hemiacetal or gem-alkoxy alcohols. They are obtained by the addition of 1 mol of a monohydric alcohol to an aldehyde in the presence of dry HCI gas.  vi. Oxime: Oximes are obtained when carbonyl compounds react with hydroxyl amine `(H_(2)N-OH)` in weakly acidic medium.  VII. Ketal: Compounds containing two alkoxy groups (OR) on the same C atom with the chain are called ketal or gemdialkoxy alkanes. They are obtained when a keton is reacted with dihydric alcohol (e.g., ethylene glycol) in the presence of dry HCI gas or p-toluene sulphonic acid.  They can be easily hydrolysed in acidic medium to regenerate the original ketone, hence it can be used for the protection of `(C==O)` group. viii. Imine: Compounds containing `(-CH==N-)` groups are called imines. They are obtained when carbonyl compounds react with ammonia derivatives.  ix. (2,4-DNP derivatives): They are produced when carbonyl compounds reacts with 2,4-dinitrophenyl hydrazine in weakly acidic medium.  2,4-DNP reagent is used as a testfor `(C=O)` group since they give coloured compounds (red, orange, or yellow precipitate). x. Schiff's base: Carbonyl componds react with `1^(@)` aliphatic or `1^(@)` aromatic amines to form azomethines or Schiff's bases. 
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| 14522. |
Which of the following is into nitropruside ion ? |
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Answer» ` [Fe(CN) _5NO]^(2-)` |
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| 14523. |
Which of the following polymers soften on heating and harden on cooling ? What are the polymers with this property collectively called ? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyls, polystyrene. |
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Answer» Solution :POLYTHENE, polyvinyls and polystyrene soften on heating and harden on cooling. Such polymers are CALLED THERMOPLASTIC polymers. These polymers are linear array of SLIGHTLY branched long CHAIN molecules. These possess intermolecular forces whose strength lies between strength of intermolecular forces of elastomers and fibres. |
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| 14525. |
Write the structure of the alkene formed by dehydrohalogenation of 1-bromo-1methylcyclohexane with alcoholic KOH. |
Answer» SOLUTION :
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| 14526. |
Which of the following contain sp^(2) hybridised carbon bonded to X? |
| Answer» ANSWER :D | |
| 14527. |
The structure of RNA molecule consists of : |
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Answer» DOUBLE helix |
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| 14528. |
What is a Gene ? |
| Answer» Solution :The segment of a DNA MOLECULE which codes for a specific PROTEIN or POLYPEPTIDE is called a gene. | |
| 14529. |
Which one of the complex salt is acting as a photo sensitiser in photosynthesis process ? |
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Answer» WILKINSON's compound |
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| 14530. |
Which of the following is an antacid? |
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Answer» Rantidine |
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| 14531. |
Which equilibrium in gaseous phase would be unaffected by an increase in preassure: |
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Answer» `N_2O_4 ⇌ 2NO_2` |
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| 14532. |
Whichsulphide is soulbe in yellow ammonium sulphide |
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Answer» HgS |
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| 14533. |
Which of the following ion has the maximum theoretical magnetic moment? |
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Answer» `FE^(3+)` |
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| 14534. |
What are X and Y respectively in the following reaction ?X overset( PBr_3) toC_2H_5 Br overset( AgOH (Aq))to |
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Answer» ` CH_3OH, C_2 H_6` <BR>` C_2H_5 OH : C_2 H_5 Br` |
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| 14536. |
Which is not correct for heterogeneous catalysis ? |
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Answer» The catalyst decreases the ENERGY of activation |
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| 14537. |
The second ionization energy is maximum for: |
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Answer» Boron |
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| 14538. |
Which of the following compounds will reacts withethanolic KCN ? |
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Answer» Ethyl chloride |
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| 14539. |
What happens when calcium acetate is dry distilled ? |
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Answer» Solution :By the DRY distillation of the calcium SALT of the respective fatty acids, ACETONE is FORMED. `(CH_(3)COO)_(2)Ca overset("Dry distillation")to CH_(3)COCH_(3)+CaCO_(3)` |
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| 14540. |
What is the product of Wurtz reaction of methyl iodide ? |
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Answer» Methane |
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| 14541. |
The resistance of a conductivity cell filled with 0.01 N soltion of NaCl is 210 ohm at 18^(@)C. Calculate the equivalent conductivity of the solution. The cell constant of the conductivity cell is 0.88 cm^(–1)|. |
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Answer» |
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| 14542. |
The void between two oppositly directed planar triangles of spheres in adjacent layers is called |
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Answer» cubic VOID |
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| 14543. |
Which of the following statements is true? A) Some disinfectants can be used as anti septics at low concentration B) Ampicillin is semi synthetic antibiotic C) Aspirin is both analgesic and antipyretic |
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Answer» A only |
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| 14544. |
Which one of the following on oxidation gives a ketone ? |
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Answer» PRIMARY ALCOHOL |
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| 14545. |
There are two ores (A_(1)) and (A_(2)) of metal ( M ). When ore (A_(1)) is calcined, a black solid (S) is obtained along with liberation of CO_(2) and water . The ore (A_(1)) on treatment with HCl and KI gives a precipitate (P) and ioidine is liberated . The ore (A_(2))on roasting gives a gas (G)and metal (M) is set free. When gas (G) is passed through acidified K_(2)Cr_(2)O_(7) solution, it turns green. Identify (M), (A_(1)), (A_(2)), (S),(P) and (G). |
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Answer» Solution :Metal ( M) is Cur and its two ores are `:` `(A_(1)) = ` malachite, `CuCO_(3) . CU(OH)_(2)`,`(A_(2)) = ` copper glance, `Cu_(2) S` The reactions involved are `underset((A_(1)))(CuCO_(3). Cu(OH)_(2)) overset("Calcination")(rarr) underset("(S) black copper (II) oxide")(2CuO) + COuarr + H_(2)O` `CuCO_(3). Cu(OH)_(2) + 4HCl rarr 2CuCl_(2)+ CO_(2) uarr + 3H_(2)O` `2CuCl_(2)+ 4KI rarr underset("Cuprous iodide ( ppt.)") underset((P))(Cu_(2)I_(2)) + 4KCl + I_(2) uarr` `underset((A_(2))) (2Cu_(2)S) + 3O_(2)overset("Roasting ")(rarr) 2Cu_(2)O+ underset((G))(2SO_(2))` `Cu_(2)S + 2Cu_(2)O rarr underset((M))(6Cu) + SO_(2)` `K_(2)Cr_(2)O_(7) + H_(2)SO_(4) + 3SO_(2) rarrK_(2)SO_(4) + underset("(GREEN)") (Cr_(2)(SO_(4))_(3)) + 4H_(2)O` `:. M = Cu , (A_(1))= CuCO_(3). Cu(OH)_(2), (A_(2)) = Cu_(2)S, S= CuO, P = Cu_(2)I_(2), G= SO_(2)` |
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| 14546. |
Which of the following statements is/are true A) Na_(2) r_(2), O_(7) is more soluble in water than K_(2)CR_(2)O_(7) B) K_(2)Cr_(2)O_(7) is used as a primary standard in volumetric analysis C) Both Na_(2)Cr_(2)O_(7) and K_(2) Cr_(2)O_(7) are strong oxidizing agents D) The chromates and dichromates are interconvertible in aqueous solutions |
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Answer» A and B |
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| 14548. |
Which of the following statement(s) is /are correct ? (i) Delta G is negative, then the reaction is spontaneous and proceeds in the forward direction. (ii) Delta G is positive, then reaction is non-spontancous (iii) Delta G is 0, then reaction is at equilibrium |
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Answer» I, II and III are CORRECT |
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| 14549. |
When acetylene reacts with HCl in presence of HgCl_2, the product is |
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Answer» METHYL CHLORIDE |
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| 14550. |
Which among the following arrangements are not geometrical isomers ? |
| Answer» Answer :D | |
