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15101.

Vernal a barbiturate drug is used as

Answer»

Anesthetic
Sedative
Antiseptic
None of these

Answer :B
Discussion
15102.

What will be the final product in the following reaction sequence? CH_3CH_2CN overset(H^(+)//H_2O)to A underset(Delta)overset(NH_3)to B overset(NaOBr)to C

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`CH_(3)CH_(2)CONH_(2)`
`CH_(3)CH_(2)COBR`
`CH_(3)CH_(2)NH_(2)`
`CH_(3)CH_(2)CH_(2)NH_(2)`

Answer :3
Discussion
15103.

Whichof thefollowingrateexpressiondoesnotrepresentthe rateof thereaction ? 2N_(2)O_(5(g)) to4NO_(2(g)) + O_(2(g))

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`-(1)/(2)(d[N_(2)O_(5)])/(dt)`
`(1)/(2)(d[N_(2)O_(5)])/(dt)`
`([O_2])/(dt)`
`(1)/(4) (d[NO_(2)])/(dt)`

SOLUTION :RATEOF reaction`=-(1)/(2) (d[N_(2)O_(5)])/(dt) `
`=+(1)/(4)(d[NO_(2)])/(dt ) =+ (d[O_(2)])/(dt)`
Discussion
15104.

ZnCl_2 in Lucas reagent is

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LEWIS ACID
Lewis base
both 'a' and 'B'
none of these

Solution :`ZnCl_2 + 2HCL to H_2ZnCl_4 OVERSET(ROH)to ` Lewis acid
Discussion
15105.

Which of the following monomers gives the polymer neoprene on polymerisation ?

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`CH_(2) = CHCI`
`Cl_(2)C = C Cl_(2)`
`CH_(2)=underset(CL)underset(|)C-CH=CH_(2)`
`CF_(2) = CF_(2)`

Answer :C
Discussion
15106.

Which of the following statements is INCORRECT for the second law of thermodynamics?

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The SPONTANEOUS FLOW of heat is always from HIGHER temperature to LOWER temperature.
No machine has yet been made that has an EFFICIENCY unity.
Heat cannot be completely converted into equivalent work.
The spontaneous flow of heat is always bidirectional.

Answer :D
Discussion
15107.

What is Royal water? Mention its uses.

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Solution :When three parts of concentrated hydrochloric ACID and one part of concentrated nitric acid are mixed, aquaregia is obtained. This is also known as Royal water. This is used for DISSOLVING gold, platinum ETC.
`Au+4H^(+)+NO_(3)^(-)+4Cl^(-) to AuCl_(4)^(-) +NO+2H_(2)O`
`3Pt+16H^(+)+4NO_(3)^(-)+18Cl^(-) to 3PtCl_(3)^(2-) +NO+8H_(2)O`
Discussion
15108.

Which of the following disease is a STD ?

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Epilepsy
AIDS
Color blindness
Leucoderma

Answer :C
Discussion
15109.

Write the name and structure of the monomers ofBuna-N.

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SOLUTION :BUTA - 1, 3 - DIENE andacrylonitrile
Discussion
15110.

What type of solids are electrical conductors, malleable and ductile?

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SOLUTION :METALLIC SOLIDS
Discussion
15111.

Why batteries discharge more quickly in cold weather? If not in use why do batteries discharge more slowly in cold weather?

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Solution :When the terminals of the battery are connected, a chemical reaction is initiated that generates electrons to supply the current. Lowering the temperature causes chemical reactions to proceed more SLOWLY. As a result, less current INS produces. CONSEQUENTLY, they quickly reach the point where they cannot deliver enough current to keep up with the demand. i the battery is warmed up, again it will OPERATE normally.
On the other hand, when the battery is not in use, it will slowly lose its charge due to leakage between the terminals. this chemical reaction is also temperature-dependent. so unused batteries will lose their charge more slowly at cooler temperature. THUS, they may be refrigerated for longer life.
Discussion
15112.

Which is the repeating unit in Neoprene ?

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`(CH_(2)-overset(overset(CH_(3))(|))(C)=CH-CH_(2))`
`(overset(overset(CL)(|))(CH)-CH=CH-CH_(2))`
`(CH_(2)-overset(overset(Cl)(|))(C)=overset(overset(Cl)(|))(C)-CH_(2))`
`(CH_(2)-overset(overset(Cl)(|))(C)=CH-CH_(2))`

Answer :D
Discussion
15113.

Which of the following is the most basic ?

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<P>`p-` PHENYLENEDIAMINE
`m-`phenylenediamine
aniline
`p-`bromoaniline

Solution :The most BASIC AMONG these is
Discussion
15114.

The statement, which prompted Neil Bartlett to prepare the first noble gas compound was

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Xe-F bond has high bond ENERGY
`F_2` has exceptionally low bond energy
`PtF_6` is a strong oxidant
`O_2` molecule and Xe atom have very similar ionization ENERGIES.

Solution :Both Xe and `O_(2)`, have comparable ionization energies.
`Xe to Xe^(-)+e^(-)` lonization energy =1, 170 KJ /MOL
`O_(2) to O_(2)^(+)+e^(-)`lIonization energy =1,175 kJ / mol
Discussion
15115.

Which of the following statements is not correct regarding cathode rays?

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The rayscarry NEGATIVE charge
The charge/ mass of these rays is CONSIDERABLY SMALLER than for positive rays
The rays produce mechanical effect
The charge /mass RATIO is independent of the nature of the gas taken in the discharge tube.

Solution :The charge / mass ratio for cathode rays is larger than for the positive rays because cathode rays have SMALL mas in comparison to positive rays while both have same charge.
Discussion
15116.

Which of the following is relation stiff and hard addition homopolymer ?

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Bekalite
MELAMINE -FORMALDEHYDE
Polypropelene
UREA - formaldehyde

ANSWER :C
Discussion
15117.

When primary amine reacts with chloroform in ethanolic KOH, then product is ……

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an ISOCYANIDE.
an ALDEHYDE.
an CYANIDE.
an ALCOHOL.

SOLUTION :An isocyanide.
Discussion
15118.

What do the number 66 and 6 represent in names of nylon-66 and nylon-6 ?

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Discussion
15119.

The voltage of the cell consisting of Li_((s)) and F_(2(g)) electrodes is 5.92 V at standard condition at 298 K. What is the voltage if the electrolyte consists of 2 M LiF. ("ln 2 = =0.693, R = 8.314 J K"^(-1)" mol"^(-1) and F = 96500" C mol"^(-1))

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5.90 V
5.937 V
5. 88 V
4. 9 V

Answer :C
Discussion
15120.

Which of the following reactions can be used to prepare acetophenone?

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Reaction of benzene with acetyl chloride in presence of anhydrous `AlCl_(3)`
DRY distillation of a mixture of calcium BENZOATE and calcium acetate
Oxidation of ethyl benzene by VANADIUM peroxide
By the action of `(CH_(3))_(2)` Cd on benzoyl chloride followed by acid hydrolysis

Answer :A::B::C::D
Discussion
15121.

Which of the following species does not exert a resonance effect ?

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`C_(6)H_(5)OH`
`C_(6)H_(5)Cl`
`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)N^(+)H_(3)`

Solution :
Anilinium ion formed by aniline on accepting a proton is less reasonane STABILISED aniline . Due to absence of lone pair conjugation of double bond of benzene it does not EXERT a resonance effect.
Discussion
15122.

When CuSO_4 is mixed with excess of NH_3, a deep blue coloured solution is obtained.Write the formula of the compound formed.

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SOLUTION :`[Cu9NH_3)_4](OH)_2`
Discussion
15123.

Which of the following pairs of substances cannot exist together in solution

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`Na_2CO_3+NAOH`
`NaHCO_3+Na_2CO_3`
`NaHCO_3+NaOH`
`NaOH+NaCl`

SOLUTION :`NaHCO_3` is a sodium SALT of weak acid, while NaOH is a strong base so, they REACT and cannot exist together in solution: `NaHCO_3 + NaOHtoNa_2CO_3 + H_2O`
Discussion
15124.

Which of the following statements is incorrect regarding physiosorptions ?

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More EASILY liquefiable gases are adsorbed readily .
Under HIGH pressure it results into MULTI molecular layer on absorbent surface.
Enthalpy of adsorption `[DeltaH_("adsorption")]`is low and positive
It occurs because of van der Waal's forces.

Answer :C
Discussion
15125.

What will be the normality of the salt solution obtained by neutralizing x mL y (N) HCI with y mL x (N) NaOH, and finally adding (x + y) mL distilled water?

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`(2(x+y))/(xy)` N
`(xy)/(2(x+y))` N
`((2x)/(x+y)) N`
`((x+y)/(xy))N`

Solution :`underset("meq LEFT")underset("meq.added") underset(0)underset(xy)(HCl) + underset(0)underset(xy)(NAOH) to underset(xy)underset(0)(NaCl) + underset(xy)underset(0)(H_(2)O)`
Normality `=("Number of meq:")/("Volume of solution in mL")`
`=(xy)/("Volume of solution in mL") =(xy)/((x+y)(x+y)) =(xy)/(2(x+y)) N`
Discussion
15126.

Write the two similarities between calcination and roasting.

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SOLUTION :(i) The END PRODUCT of both the processes is oxide of metal.
(ii) Volatile impurities are removed from the ore and surface AREA for the further REACTION increases.
Discussion
15127.

Which part of the protein molecule is responsible for function and activity of the proteins

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SECONDARY STRUCTURE
Peptide BOND
PRIMARY structure
BINDING sites

Answer :D
Discussion
15128.

Which one of the following geometry is possessed by [CuCl_(2)]^(-) and [Ag(CN)_(2)] ?

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TRIGONAL planar
Linear
Tetrahedral
SQUARE planar

Answer :A::B
Discussion
15129.

The yield of the products in the reaction,A_(2(g))+2B_((g))hArr C_((g))+Q kJ would be higher at :

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1. high TEMPERATURE and high PRESSURE
2. high temperature and low pressure
3. low temperature and high pressure
4. low temperature and low pressure

ANSWER :C
Discussion
15130.

What is the vapour pressure at 100^(@)C of a solution containing 15.6g of water and 1.68g of sucrose (C_(2)H_(22)O_(11)) ?

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ANSWER :`75.57cm`
Discussion
15131.

Which solution has pH equal to 10 ?

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`10^(-4) M KOH`
`10^(-10) M KOH`
`10^(-10) M HCL`
`10^(-4) M HCl`

SOLUTION :`pOH=- log [OH^(-)]`
`pH+pOH=14`
For `10^(-4)KOH, [OH^(-)]=10^(-4)`
`pOH= - log[OH^(-)]= - log 10^(-4)=4`
pH=14-pOH=10
Discussion
15132.

Which of the following is tetrahedral and paramagnetic ? MnO_(4)^(-), CrO_(4)^(--), Cr_(2)O_(7)^(2-), MnO_(4)^(--), CIO_(4)^(--), CIO_(3)^(--), NO_(2), N_(2)O_(4) [If your answer is 5 so write 0005.]

Answer»


Solution :`MnO_(4)^(2-)`, is TETRAHEDRAL and paramagnetic.
Discussion
15133.

Which one of the following process is reversible?

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Melting of ice at `10^@C.`
Mixing of three gases by diffusion.
Evaporation of WATER 373 K and 1 atm pressure in closed container.
A SOLID NaCl dissolves in water.

Answer :C
Discussion
15134.

Which one of the following statements is not true

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The conjugate BASE of `H_(2)PO_(4)^(-)` is `HPO_(4)^(2-)`
`pH + pOH = 14` for all aqueous solutions
The pH of `1 xx 10^(-8)` M HCl is 8
96, 500 COULOMBS of electricity when passed THROUGHA `CuSO_(4)` SOLUTION deposits 1 gram equivalent of copper at the cathode

Solution :Because pH = 8 is basic nature but HCl is a strong acid.
Discussion
15135.

Which is not true statement about KMnO_(4)

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it's solution is unstable in acidic medium
its SMALL quantity added to conc. `H_(2)SO_(4)` a solourless solution containing `MN^(2+)` ion
`MnO_(4)^(-)` changes to `Mn^(2+)`ion in basic medium
it act as oxidising AGENT in acidic, basic and netural medium

Answer :C
Discussion
15136.

Which of the following is the correct order of decreasing S_(N^2) reactivity?

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`RCH_(2) X gt R_(3) CX gt R_(2)CHX`
`RCH_(2)XgtR_(2)CHXgt R_(3)RX`
`R_(3)CX gt R_(2)CHX gt R_(2)CHX gt RCH_(2)X`
`R_(2)CHX gt R_(2)CX gt RCH_(2)X`.

SOLUTION :It is the correct decreasing order of reactivity (i.e., `1^(@) gt 2^(@) gt 3^(@)`) towards `S_(N^(2))` reaction mechanism. Since steric HINDRANCE which the attacking nuleophile is expected to experience decreases in this order
Discussion
15137.

Which of the following is 2- phenylpentanoicacid ?

Answer»




ANSWER :D
Discussion
15138.

Which of the following ketonic compound is the least stable?

Answer»




SOLUTION :
Discussion
15139.

What is salvarsan To which class of drugs does it belong and for what disease is it used ?

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SOLUTION : Salvarsan is an ANTIMICROBIAL AGENT. It is used for the TREATMENT of the disease called syphilis
Discussion
15140.

Which one of the following is NOT TRUE for the hydrolysis of t-butyl bromide with aqueous NaOH?

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Reaction occurs through the `S_(N)1` mechanism.
The INTERMEDIATE FORMED is a carbocation.
Rate of the reaction doubles when the concentration of alkali is doubled.
Rate of the reaction doubles when the concentration of t-butyl bromide is double.

Solution :Hydrolysis of t-butyl bromide with AQUEOUS NAOH is the `""^(S)N1` mechanism.Rate of reaction depends only on concentration of haloalkane.
Discussion
15141.

Which of the following body parts is not composed of structural proteins :

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MUSCLE
Nails
Bones
Skin and BONE matrix

Answer :B
Discussion
15142.

Which of the followingpairs of ionscannotbe seprated by H_(2)S indilate HCl?

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`Bi^(3+) ,Sn^(4+)`
`Al^(3+) ,Hg^(2+)`
`ZN^(2+) ,CU^(2+)`
`Ni^(2+) ,Cu^(2+)`

Solution :In the presence of HCI both ions are precipitate by `H_(2)S`
`Bi^(3+) + H_(2)S overset(HCI) to underset(BROWN)(Bi_(2)S_(3))DARR `
`Sn^(4+) + H_(2)S overset(HCI) to underset(yellow)(SnS_(2) darr)
Discussion
15143.

Which of the followng has maximum number of unpaired electrons?

Answer»

`Mg^(2+)`
`TI^(3+)`
`V^(3+)`
`FE^(2+)`

Solution :`Mg^(2+)` (0 UNPAIRED ELECTRON)
`Ti^(3+)` (1 unpaired electron)
`V^(3+)`(2 unpaired electrons)
`Fe^(2+)` (4 unpaired electrons)
Discussion
15144.

When a brown compound of manganese (A) is treated with HCl it gives a gas (B). The gas taken in excess reacts with NH_(3) to give an explosive compound (C). Identify compounds A, B and C.

Answer»

Solution :The compounds A, B and C are as follows :
`A=MnO_(2)""B=Cl_(2)""C=NCl_(3)`
The reactions are explained as under :
`underset([A])(MnO_(2))+4HCl to MnCl_(2)+underset([B])(Cl_(2))+2H_(2)O`
`underset("Excess")(3Cl_(2))+NH_(3)to underset([C])(NCl_(3)+3HCL)`
Discussion
15145.

The smallest ketone and its next homologue are reacted with NH_(2)OH to form oxime

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two different OXIMES are formed
THREE different oximes are formed
two oximes are optically active
all oximes are optically active

Solution :The smallest ketone is acetone. It being a symmetrical ketone FORMS only ONE oxime. The next homologue of acetone is butanone. It being unsymmetrical forms to oximes, i.e., cis-and trans butanone oxime. Thus, in all, there are three oximes.
Discussion
15146.

When m - chlorobenzaldehyde is treated with KOH solution, the product (s) is/are :

Answer»




ANSWER :B
Discussion
15147.

When 100 ml of 1 M NaOH solution and 10 ml of 10 N H_(2)SO_(4) solution are mixed together, the resulting solution will be

Answer»

Alkaline
Acidic
Atrongly acidic
Neutral

Solution :For `NAOH, M=N`
`N_(1)V_(1)=100 ml XX 1N=100` ml (N)
For `H_(2)SO_(4), N_(2)V_(2)=10mlxx10 N=100` ml (N)
HENCE, `N_(1)V_(1)=N_(2)V_(2)`.
Discussion
15148.

Which of the following are non - reducing sugars ?

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GLUCOSE
Sucrose
Maltose
Lactose

Answer :B
Discussion
15149.

Which of the following is a chemical fertilizer?

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Urea
Sodium
Ammonium sulphate
All of these

Answer :D
Discussion
15150.

Which of the following mixture is the ideal solution ?

Answer»

Chloroform and acetone
BENZENE and toluene
Phenol and ANILINE
HCl and `H_(2)O`

ANSWER :B
Discussion