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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.
| 8501. |
The toxicity order of CH_3OH,C_2H_5OH and C_3H_7OH is: |
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Answer» `C_2H_5OH LT CH_3OH lt C_3H_7OH` |
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| 8502. |
The relative lowering of vapour pressure is equal to the mole fraction of thesolute. This law is called |
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Answer» HENRY's LAW |
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| 8503. |
Which of the following statement is not true for a square close-packed arrangement of identical spheres- |
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Answer» unit cell is a square |
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| 8504. |
Which of the following is positively charged colloid? |
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Answer» HAEMOGLOBIN |
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| 8505. |
When manganese dioxide is fused with KOH in air, it gives : |
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Answer» POTASSIUM permanganate |
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| 8506. |
Two glass bulbs A and B are connected by very small tube having a stop cock. Bulb A has a volume of 100 ml and contained the gas while bulb B was empty and had a volume of 150 ml. on opening the stop-cock, the pressure of the gas in bulb A will fall down to: |
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Answer» 0.8 |
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| 8507. |
Violet coloured complex among the following is |
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Answer» `[NI(H_2O)_6]^(2+)` |
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| 8508. |
Which one of the following is used is cryosurgery? |
| Answer» Solution :`Liq N_(2)` | |
| 8509. |
The vapour pressure in mmHg of a CH_(3)OH-C_(2)H_(5)OH binary solution , p, at a certain temperature is represented by the equation p=254-119x, where x is the mole fraction of C_(2)H_(5)OH . Find the vapour pressure of the pure components. |
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Answer» Solution :We have, `p=x_(A).p_(A)^(0)+x_(B)p_(B)^(0)`………..(EQN. 3) or `p=x_(CH_(3)OH).p_(CH_(3)OH)^(0)+x_(C_(2)H_(5)OH).p_(C_(2)H_(5)OH)^(0)` or `p=(1-x_(C_(2)H_(5)OH)p_(CH_(3)OH)^(0))+x_(C_(2)H_(5)OH).p_(C_(2)H_(5)OH)^(0)` or `p=p_(CH_(3)OH)^(0)-(p_(CH_(3)OH)^(0)-p_(C_(2)H_(5)OH)^(0))x_(C_(2)H_(5)OH)`. Comparing this EQUATION with the GIVEN equation, we get `p_(CH_(3)OH)^(0)=254mm` and `p_(CH_(3)OH)^(0)-p_(C_(2)H_(5)OH)^(0)=119mm` `:.p_(C_(2)H_(5)OH)^(0)=254-119=135mm` |
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| 8511. |
What are biodegradable polymers ? Give two examples. |
| Answer» SOLUTION :Polymers which are degraded by micro-organisms within a suitable PERIOD so that the polymer and its degraded products do not CAUSE any serious effect on ENVIRONMENT are called BIODEGRADABLE polymers e.g. PHBV, Nylon -2-Nylon-6 | |
| 8512. |
The surface tension of ethenol at 30°C is 2.189 xx 10^(-2) Nm^(-1)and its density = 0.780 g/cc. To what height will this liquid rise in a capillary tube of radius 0.002 cm? What pressure is needed to push the miniscus level back with the surrounding liquid? |
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Answer» <P> Solution :We have, `(2lambda)/(rdg)``d=0.78 g//cc = 0.78 kg//L = 0.78 xx 10^(3) kg//m^(3)` `r=0.002 cm = 2.0 xx 10^(-4) m, g=9.8 m//s^(2)` `therefore h=(2 xx 2.189 xx 10^(-2))/(2.0 xx 10^(-4) xx 0.78 xx 10^(3) xx 9.8) = 0.0286` m. Further, the pressure (p) required to push the LIQUID back with the SURROUNDING liquid is given by: `p=h.d.g` `=0.0286 xx 0.78 xx 10^(3) xx 9.8` `=218.6` PA (or `Nm^(-2)`) |
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| 8513. |
Who suggested that the solute in the dilute solution behaves like a gas ? |
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Answer» Van't - HOFF and Pfeiffer |
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| 8514. |
When chlorine is passed through warm benzene in presence of the sunlight, the product obtained is |
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Answer» benzotrichloride 
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| 8515. |
ZnO is colourless at room temperature, while yellow when hot. Why ? |
| Answer» Solution :ZnO is colourless at room temperature. When it is HEATED, it BECOMES yellow in colour. On HEATING, it loses oxygen and thereby forming free `Zn^(2+)` ions. The excess `Zn^(2+)` ions move to interstitial sites and the ELECTRONS also occupy the interstitial positions. | |
| 8517. |
What will be the theoretical rate of elementary reaction if pressure of O_(2) is increased by three times? 2SO_(2(g))+O_(2(g))to2SO_(3(g)) |
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Answer» 27 TIME increase |
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| 8518. |
Write the structure all possibledipeptides which can beobtainedfrom glycine andalanine . |
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Answer» Solution :(i) `UNDERSET("GLYCINE")(H_2N - CH_2 -COOH + H_2 N)-underset("(ALANINE)")(underset(CH_3)underset(|)CH-COOH underset(-H_2 O)to H_2 Nunderset("(Glycyl alanine)")(-CH_2 - CONH - underset(CH_3)underset(|)CN-COOH)` `(II) underset("(ALanine)")(H_2 H - underset(CH_3)underset(|)CH-COOH-underset("(Glycine)")(+H_2 N - CH_2 - COOH) underset(-H_2 O) to underset("(Alanyl glycine)")(H_2 N - underset(CH_3)undeset(|)CH- CONH - CH_2 - COOH)` Therefore towdipeptidesstructures are possiblefromglycineand alanine . Theare (i) glycyl alanin and (ii) Alanyl glycine. |
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| 8519. |
What is meant by coordination polyhedron? |
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Answer» Solution :The three DIMENSIONAL spatial arrangement of ligand molecules / IONS that are directly ATTACHED to the central metal atom is KNOWN as coordination polyhedron (Polygon). For e.g, In `K_(4)[Fe(CN)_(6)]` the coordination polyhedra is octahedral. |
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| 8520. |
Which rate expression suggests an over all order of 0.5 for the reaction involving substances X, Y, Z: |
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Answer» Rate = `K[X][Y][Z]` |
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| 8521. |
Two electrochemical cells are assembled in which the following reaction occur. V^2+VO^2+2H^+ to 2V^3+H_2O, E_(cell) ^@=0.616V V^3+Ag^+ +H_2O to VO^2+2H^+ + Ag(s), E_(cell)^@=0.439V calculate E^@ for the half cell reaction V^(3+) +e to V^(2+) (E_(Ag)^@, Ag=0.799 volt ) |
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Answer» Solution :Let us find the number of electrons INVOLVED in each REACTION `V^(2+)+VO^(2+)+2H^+ to V^(3+)+V^(3+)+H_2O....(I)`  `V^(2+)+AG^+ +H_2O to Ag(s)+VO^(2+)+2H^+`  ADDING (1) and (2) we get `V^(2+)+Ag^+ to V^(3+) +Ag(s), Delta G^@=-(1 times F times 0.616+1 times F times 0.439)` `=1.055F` `therefore E_(CELL)^@= - (DeltaG^@)/(nF)= (1.055 F)/F=1.055V` Furhter for the above cell `E_(cell)^@=E^@Ag^+,Ag-E_(v^(3+))^@,V^(2+)` `1.055=0.799-E_(v^(3+))^@,V^(2+)` or `E_(v^(3+))^@,V^(2+)=0.799-1.055` `=-0.256` volt |
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| 8522. |
Which of the following sequence of reactions convert aniline into chlorobenzene |
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Answer» CONC. HCl under high P and high T 
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| 8523. |
Which will not give acetamide on reaction with ammonia? |
| Answer» Solution :methyl formate | |
| 8524. |
The structural formula of the comopund with yields propylene on elimination is, |
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Answer» `(CH_(3))_(2)CHCL` |
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| 8525. |
Two reactants A and B separately shows two chemical reactions. Both reactions are made with same initial concentration of each reactant. Reactant A follows first order kinetics whereas reactant B follows second order kinetics. If both have same half lives, compare their rates (a) at the start of reaction (b) after the lapse of one half -life . |
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Answer» Solution :For `A :` rate `=k_(A)[A]^(1)`………..`(i)` and `(t_(1//2))_(A)=(0.693)/(k_(A))`…………`(ii)` For`B :` rate `=k_(B)[B]^(2)`………….`(iii)` and `(t_(1//2))=(1)/(ak_(B))` ………….`(iv)` where a is initial concentration `(a)` Initial rate of A, `r_(A)=k_(A)xxa` Initial rate of `B`, `r_(B)=k_(B)xxa^(2)` `:. (r_(A))/(r_(B))=(k_(A))/(k_(B))xx(1)/(a)` ..................`(v)` From EQS. `(ii)` and `(iv)` if `(t_(1//2))_(A)=(t_(1//2))_(B)`, then `(0.693)/(K_(A))=(1)/(k_(B)a)` or `(k_(A))/(k_(B))=0.693xxa`............`(vi)` `:.` From Eqs. `(v)` and `(vi)`, `(r_(A))/(r_(B))=(0.693a)/(a)=0.693` `(b)` After lapse of `1` half , the new rates are `R._(A)` and `r._(B)` `r._(A)=k_(A)xx(a)/(2)`, `r._(B)=k_(B)xx(a//2)^(2)` `:.(r._(A))/(r._(B))=(k_(A))/(k_(B))xx(2)/(a)` ................`(VII)` By Eqs. `(vi)` and `(vii)` `(r._(A))/(r._(B))=0.693xxaxx(2)/(a)=1.386` |
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| 8526. |
Vitamin-D is also known as |
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Answer» ASCORBIC acid |
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| 8527. |
Which one of the following has DeltaS^(@) greater than zero |
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Answer» `CaO(s) + CO_(2)(g) hArr CaCO_(3)(s)` |
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| 8528. |
Which of the following is notcorrectly matched ? |
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Answer» NEOPRENE : `[-CH_(2)-UNDERSET(Cl)(C)=CH-CH_(2)-]_(n)` |
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| 8529. |
The shape of XeF_(6) is |
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Answer» SQUARE planar 
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| 8530. |
The value of four quantum number for the last e^(-) of atom of element x are n = 7, l = 1, m = + 1 and s = +1//2(or) -1//2 and value of spin magnetic momentum for element 'X' is zero. Element X has two isotopes (I)_(z)X^(A) (II)._(z)X^(B) Given B-A=18 andB-2Z = 18 where A and B are atomic masses and Z is atomic number. The correct statment regarding element ''X'' is : |
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Answer» Element belong to `18^(TH)` group n = 7, l = 1, m = + 1 and s = + 1/2 or - 1/2 and `mu=0` (spin only magnetic moment) 7P sub-shell, given `mu=0` then number of unpaired electrons is zero hence it will be `7p^(6)` X belong to 18 group and `7^(th)` period hence Z = 118 X is p-block element |
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| 8531. |
Write the conditions to maximise the yield of H_2SO_4 in contact process. |
| Answer» Solution :The IMPORTANT STEP in the MANUFACTURE of`H_2SO_4` is the oxidation of `SO_2` to `SO_(3).2SO_2+O_2iff2SO_3Deltah=-196.6kj//mol` According to Le-Chatelier’s PRINCIPLE, low temperaturei and high pressure favour the oxidation of `SO_2` to `SO_3`. But at low temperature reaction rate will be low. So an optimum temperature of 720K is used in CONTACT process. Pressure used is about 2 bar and is used as. catalyst for the reaction. | |
| 8532. |
The value of four quantum number for the last e^(-) of atom of element x are n = 7, l = 1, m = + 1 and s = +1//2(or) -1//2 and value of spin magnetic momentum for element 'X' is zero. Element X has two isotopes (I)_(z)X^(A) (II)._(z)X^(B) Given B-A=18 and B-2Z = 18 where A and B are atomic masses and Z is atomic number The value of (A) and (B) respectively are : |
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Answer» 118 and 136 B - 2Z = 18 B = 18 + 2Z B = 254 B - A = 18 A = 236 |
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| 8533. |
Which of the following will produce methylcyclopentanol on heating with conc. H_(2)SO_(4)? |
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Answer» 2-cyclopentylethanol |
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| 8534. |
Which set of molecule is polar? |
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Answer» `p`-dimethyloxy bezene and `p`-dinitro BENZENE 
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| 8535. |
The X-X bond dissociation energy is minimum in: |
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Answer» `F_2` |
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| 8536. |
What is the repeating unit in the condensation polymer obtained by combining HO_(2)CCH_(2)CH_(2)COOH (succinic acid) H_(2)NCH_(2)CH_(2)NH_(2) (ethylendiamine). |
| Answer» Solution :The repeating structural unit is OBTAINED by condensing at both ends of both the bifunctional MOLECULES, i.e., succinic ACID `(HOOCCH_(2))` and ethylendiamine with the elimination of water molecules, i.e., `-OC CH_(2)CH_(2)CO-NHCH_(2)CH_(2)NH-`. | |
| 8537. |
What mass of NaCl must be dissolved in 65.0 g of water to lower the freezing point of waterby 7.50^@C? The freezing point depression constant (Kg) for water is 1.86^@C/m. Assume van't Hoff factor for NaCl is 1.87.[Molar mass of NaCl = 58.5 g] |
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Answer» Solution : van.t Hoff FACTOR = Observed DEPRESSION in freezing point / Calculated depression in freezing point 1.87 = 7.5/Calculated depression Calculated depression = 7.5/1.87 = 4 Now apply the RELATION `M_2 = (K_f xx w_2 xx 1000)/(Delta T_f xx w_1)` `58.5 = (1.86 xx w_2 xx 1000)/(4 xx 65)` `w_2 = (58.5 xx 4 xx 65)/(1.86 xx 1000) = 8.177 g` |
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| 8538. |
Which of the following compound has a square pyramidal structure ? |
| Answer» Answer :C | |
| 8539. |
Which is the strongest acid in the following ? |
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Answer» `HClO_(4)` |
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| 8540. |
Which one of the following is used to provide relief from the allergic effects? |
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Answer» CETRIZINE |
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| 8541. |
Which of the following is not correctly mathced ? |
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Answer» `[Fe(CN)_(6)]^(3-) - d^(2)sp^(3)` and paramagnetic In formation of complex `=3d^(8)` [due to effect of ligand] hybridisation `=dsp^(3)`, diamagnetic |
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| 8542. |
Which is monobasic acid : |
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Answer» ACETIC acid |
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| 8543. |
Yellow precipitate obtainedduring the test of halogen by lassaigne's test is due to the formation of |
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Answer» `AgF` |
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| 8544. |
What will be hydrogen ion concentration in moles "litre"^(-1) of a solution, whose pH is 4.58 |
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Answer» `2.63 XX 10^(-5)` `[H^(+)] = 2. 63 xx 10^(-5)` moles/litre. |
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| 8545. |
which of the following statements regarding Psi^2 is not correct? |
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Answer» it may be POSITIVE negative or imaginary |
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| 8546. |
Which of the following is the correct order for theoretical magnetic moment? |
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Answer» `CR^(3+) = MN^(2+) lt Fe^(3+)` `Mn^(+2) = 3d^(5)` 5 unpaired electrons `Fe^(+3) = 3d^(5)` 5 unpaired electrons |
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| 8547. |
When a lead storage battery is discharged Sulphuric acid is consumed Water is formed Lead sulphate is produced at both electrodes SO_2 is evolved The correct statement is/are |
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Answer» only 1 |
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| 8548. |
What are enzymes ? Discuss the mechanism of enzyme catalysed reaction. |
| Answer» | |
| 8549. |
Write units of rate constant k for zero order , first order , second order and n^(th) order reaction. |
| Answer» Solution :`{:("Order REACTION","Unit of k"),("1. ZERO order reaction ","molL"^(-1)s^(-1)),("2. First order reaction ",s^(-1)),("3. Second order reaction ","mol L"^(-1)s^(-1)),(4. N^(th)"order reaction ",(mol//L)^(1-n)s^(-1)):}` | |
| 8550. |
What is the molality of pure water ? |
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Answer» `50.5` |
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