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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.
| 23451. |
Which BLUE LIQUID is obtained on reacting equimolar amounts of two gases at -30^(@)C |
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Answer» `N_(2)O` |
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| 23452. |
Which one is Lewis acid |
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Answer» `CL^(-)` |
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| 23453. |
The reduction potential diagram for Cu in acid solution is : Calculate X. Does Cu^(+) disproportionate in solution ? |
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Answer» Solution :`Cu^(2+),e to Cu^+ , E^@=0.15 , Delta G^@=n F E^@=-1 times 0.15 F =-0.15 F` `Cu^+ + e to Cu: E^@= 0.50, Delta G^@=-1 times 0.50 F=-0.50 F` On adding `Cu^(2)+2 e to Cu, Delta G^@=-0.65 F` `E_(Cu^(2+),Cu)^@=(Delta G^@)/(- n F)=(-0.65 F)/(-2F)=0.325 ` volt `x=0.325` volt Further `Cu^+ to Cu^(2+) +e, Delta G^@=-nFE^@=-1 times (-0.15)F=0.15 F` `Cu^+ +e to Cu, Delta G^@=-nFE^@=-1 times 0.50 times F=-0.50 F` `=0.0591/n log {[Ag^+]_(righ t)/[Ag^+]_(l eft)}` `=0.0591/1 log""0.1/0.001=0.0591 log 100` `=0.1182` volt Since `E_(cell)` is positive, the right ELECTRODE will act as cathode (where reduction occurs) and the left electrode will act as anode (where oxidation occurs) The electrons will thus TRAVEL from left to right in external circuit. |
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| 23454. |
You are supplied with 500 mL each of 2 N HCl and 5 N HCI. What is the maximum volume of 3 M HCI that you can prepare using only these two solutions? |
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Answer» 250 mL So, `N_(1)V_(1) + N_(2)V_(2) = N_(3)V_(3)` `=500 xx 2 + x xx 5 = (x+500) xx 3` (`THEREFORE` Volume of 3 M solution formed = 500 mL + x mL) `therefore 1000 + 5x = 250 mL` Then, maximum volume of 3 M solution formed `=500 + 250 = 750 mL` |
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| 23455. |
Which is not solubel in water |
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Answer» `CaCO_(3)` |
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| 23456. |
When the product of pressure and volume is plotted against pressure for a given amount of gas, the line obtained is : |
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Answer» PARALLEL to X - axis |
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| 23457. |
Which of the following is used in fire extinguishers ? |
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Answer» `CH_(4)` |
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| 23458. |
Which one of the following salts when dissolved in watermakes the solution basic ? |
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Answer» SODIUM chloride |
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| 23459. |
Which of the following is a biodegradable polymer? |
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Answer» Nylon-66 |
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| 23460. |
What is the formula of freon which is used as a refrigerant? |
| Answer» Answer :A | |
| 23461. |
What is IUPAC name of compound when divalent oxygen atom is attached to n-propyl group and iso-propyl group? |
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Answer» Propoxy- 2-propane |
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| 23462. |
Which of the following has smallest bond angle ? |
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Answer» `NO_(2)^(+)` |
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| 23463. |
The vacant space in body centred cubic lattice bcc unit cell is about: |
| Answer» ANSWER :A | |
| 23464. |
Whichoneoffollowingformularepresentsthefirstorderreaction ? |
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Answer» `k= (2.303)/(t)LOG"" ([A])/([A_(0)])` |
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| 23465. |
Which compound is used as a purgative in medicine? |
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Answer» `HgCl_2` |
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| 23466. |
Which one of the following is an example for molecular crystals? |
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Answer» Diamond |
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| 23467. |
Which of the following reagents can not be used to distinguish between pentanal and 2- pentanone ? |
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Answer» `I_(2)` in NaOH |
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| 23468. |
Which of the following order represents correctly according to the property given: |
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Answer» `H_(2)OgtH_(2)SgtH_(2)Se gt H_(2)Te` : POLARITY of the molecule |
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| 23469. |
Write the mechanism of the following reaction :nBuBr + KCN overset(EtOH-H_(2)Orarr nBuCN |
Answer» Solution :The SUBSTRATE is `1^(@)` halide and`""^(-)CN` is a strong nucleophile. HENCE, REACTION FOLLOWS `S_(N)2` PATH.
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| 23470. |
[Ti(H_2O)6]^(3+) is paramagnetic in nature due to |
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Answer» ONE UNPAIRED electron |
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| 23471. |
What is the role of HNO_(3) in the nitrating mixture used fr nitration of benzene? |
Answer» Solution :`HNO_(3)` ACTS as a base in the NITRATING mixture (conc. `HNO_(3)+conc.H_(2)SO_(4)`). `H_(2)SO_(4)` acts on `HNO_(3)` to generate the electrophile, `NO_(2)^(+)` (nitronium ION). 
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| 23473. |
There are four radioactive decay series called thorium (4n), uranium (4n + 2) actinium (4n + 3) and neptunium (4n + 1) series. Neptunium series is artificial while other three series are natural. The end productsd of each radioacitve decay series have stable nuclei. All natural decay series terminate at lead but neptunium or artificial series terminate at bismuth. The starting isotope and the end product: isotope of actinium series are |
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Answer» `._(88)AC^(227)` and `._(82)Pb^(208)` |
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| 23474. |
The tendency of the transition metals to from complexes is expiained in terms of : |
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Answer» Small size of the metal ION |
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| 23475. |
Which one of the following elements has highest ability for catenation ? |
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Answer» O |
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| 23476. |
Which one of the following aldehydes will not form an aldol when treated with dilute NaOH : |
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Answer» `CH_3CHO` |
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| 23477. |
Which of the following biomolecules always contain nitrogen: |
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Answer» Carbohydrates |
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| 23478. |
Which is not an ore of magnesium? |
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Answer» CARNALLITE |
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| 23479. |
When lead storage battery is charged ………….. . |
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Answer» `PbO_2` is DISSOLVED |
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| 23480. |
Which catalyst is used in the conversion of acetaldehyde to acetic acid? Give equation. |
| Answer» Solution :`underset("Acetaldehyde)(CH_(3)-CHO))+O underset("oxidation")overset(Rh//Ir "COMPLEX")to underset("ACETIC acid")(CH_(3)-COOH)` | |
| 23481. |
Which of the following molecule is expected to rotate plane polarised light :- |
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Answer»
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| 23482. |
Which of the following statements regarding the molecularity of a reaction is wrong |
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Answer» It is the number of molecules of the reactants taking part in single STEP chemical reaction |
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| 23483. |
Which one of the following reactions doesnot occur? |
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Answer» `BAO+O_(3) to BaO_(2)+O_(2)` |
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| 23484. |
What are the reagent and reaction conditions used for converting ethyl chloride to ethyl nitrite (as the major product) ? |
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Answer» `KNO_2, C_2H_5OH, H_2O, DELTA ` |
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| 23485. |
Write the names of reagents and equations for the preparation of the following ethers by Williamson.s synthesis : (i) 1 - Propoxypropane (ii) Ethoxybenzene (iii) 2 - Methoxy -2- methylpropane (iv) 1 - Methoxyethane |
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Answer» Solution :The substances on reactant side can be employed for the PREPARATION of the DESIRED ethers by Williamson SYNTHESIS. (i) 
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| 23486. |
Which of the following should be most valatile ? CH_(3)CH_(2)CH_(2)NH_(2) (CH_(3))_(3)N C_(2)H_(5)-NH-CH_(3) CH_(3)CH_(2)CH_(3) |
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Answer» II |
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| 23487. |
When in reaction concentration of reactant is 8 time increase then rate of reactant is doubled than what is order of reaction? |
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Answer» Solution :Suppose the order =x Initial rate =`r_(1)=k[R]^(x)` New Rate =`r_(2)`=k`[8R]^(x)=K8^(x)[R]^(x)` But new rate =`r_(2)=2r_(1)` `therefore 2r_(1)=k 8^(x)[R]^(x)` So, `(2r_(1))/(r_(1))=(k(8)^(x)[R]^(x))/(k[R]^(x))` `therefore 2=8^(x)` `therefore 2=8^((1)/(3))` So,order of reaction`x=(1)/(3)` |
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| 23488. |
The root mean square velocity of gas is doubled, which of the following is correct ? |
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Answer» Its temperature is doubled If T is increase 4 times, `U_("rms")` will BECOME double. `U_("rms")=sqrt((3P)/(d))`. If P is made four times .d. will became four times THEREFORE .u. remanic same. Hence B is not correct. (D) is correct because if P will not affect density as EXPLAINED in (B) but `U_("rms") prop sqrt (T)`, Hence `U_("rms")` becomes double. Hence, (C ) and (D) are the correct answer. |
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| 23489. |
Write the structure of reagents/ organic compounds 'A' to 'F': |
Answer» Solution :`A overset(NaOH//Br_(2)) underset(H_(2)o)toB overset(NaNO_(2)//HCI) underset("O.C")TOC overset ("D")to E overset(CI_(2)//Fe)to F` 
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| 23490. |
What is the basic difference between antiseptics and disinfectants ? |
| Answer» Solution :ANTISEPTICS are APPLIED to living TISSUES whereas disinfectants are applied to non-living OBJECTS. | |
| 23491. |
Which of the following sulphides are soluble in yellow ammonium sulphide? |
| Answer» Solution :`As_(2)S_(3), Sb_(2)S_(3)`, SnS | |
| 23492. |
Which one of the following describes the quality of soap? |
| Answer» Solution :TFM value | |
| 23493. |
What is a salt bridge? Explain the functions of a salt bridge. |
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Answer» Solution :A salt bridge is a U-shaped glass TUBE containig a saturated solution of a strong electrolyte, like `KCl,NH_(4)NO_(3), Na_(2)SO_(4)` in a SOLIDIFIED arar-agar gel. A hot saturated solution of these electrolytes in 5% agar solution is filled in the U-shaped tube and allowed it to cool and solidify forming a gel. The functions of a salt bridge are : (1) It maintains the electrical contact between the two electrode solutions of the half cells. (2) It prevents the mixing of electrode solutions. (3) It maintains the electrical neutrality in both the solutions of two half cells bya flow of ions. It eliminates the liquid junction potential. 
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| 23494. |
Which alcohol respond slowly in Lucas Test? |
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Answer» Primary |
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| 23495. |
Which amino acid does not have primary amine |
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Answer» Proline |
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| 23496. |
When vegetable oils react with hydrogen in presence of finely divided nickel catalyst we get: |
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Answer» SATURATED FAT |
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| 23497. |
What are allotropes of sulfur? |
| Answer» SOLUTION :Rhombic SULFUR, MONOCLINIC sulfur and plastic sulfur are the ALLOTROPES of sulfur. | |
| 23498. |
What may be stable oxidation state of the transition element with the following d electronconfiguration in the ground state of their atoms ? 3d^(3) , 3d^(5), 3d^(8)and 3d^(4) |
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Answer» Solution :`3d^(3) 4s^(2) = + 5 , 3d^(5) 4s^(1) = + 6 , 3d^(5)4s^(2) = +2 , + 7 , 3d^(8)4s^(2) = + 2 , 3d^(4)4s^*(2) = 3d^(5)4s^(1) = + 6 ( & + 3)` Note. The MAXIMUM oxidation states of reasonable stability CORRESPOND to the sum of s and d- electrons upton Mn. After that, there is abrupt decrease in the stability of higher oxidation states. |
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| 23499. |
Which of the following does not affect the rate of reaction ? |
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Answer» Amount of the reactant taken |
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| 23500. |
When the substances Si, KCl, CH_(3)OH and C_(2)H_(6) are arranged in order of increasing melting point, what is the correct order ? |
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Answer» `Si, KCl, CH_(3)OH, C_(2)H_(6)` |
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