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6251.

What is the cause of a feeling of depression in human beings ? Name a drug which can be useful in treating depression.

Answer»

Solution :Low level of noradrenaline, a neurotransmitter causes DEPRESSION in HUMAN beings. ANTIDEPRESSANT DRUGS are Iprniazid, Phenelzine.
Discussion
6252.

Voids present in body center unit cells are....

Answer»

`32%`
`34%`
`30%`
`28%`

ANSWER :A
Discussion
6253.

Which of the following are ambidentate ligands?

Answer»

`CN^(-),NOS^(-),P(C_(6)H_(5))_(3)`
`H_(2)N-NH_(2),S_(2)O_(3)^(2-),CNO^(-)`
`N_(3),CO_(3)^(2-),NO_(2)`
`NO_(2),NOS^(-),CNO^(-)`

Answer :D
Discussion
6254.

Which one of the following is employed as Anithistamine

Answer»

Norothindrone
Chloramphenicol
DIPHENYL HYDRAMINE
Omeprazole

Solution :Diphenyl hydramine is EMPLOYED as ANTIHISTAMINE.
Discussion
6255.

When chloroform is treated with excess oxygen it forms

Answer»

`COCl_(2)+HCL`
`COCl_(2)+Cl_(2)+H_(2)`
`COCl_(2)+Cl_(2)+H_(2)O`
No PRODUCT will be formed

Solution :`CHCl_(3)+O_(2) OVERSET(hv)toCOCl_(2)+Cl_(2)+H_(2)O`
Discussion
6256.

Which of the following radicals does not belong to group first?

Answer»

`AG^(+)`
`PB^(2+)`
`Hg_(2)^(2+)`
`Hg^(2+)`

Solution :`Hg^(2+)` is not PRECIPITATED as CHLORIDE but is precipitated as HGS in group II
Discussion
6257.

Which of the following method(s) would be useful for preparing ketones?

Answer»

Friedel-Crafts REACTION of an acyl chloride with BENZENE (`AICI_(3)` catalysis).
Reaction of methyllithiumn with the LITHIUM SALT of carboxylic acid, followed by hydrolysis.
Reaction of `R_(2)CuLi` with an acyl chloride in ether at low temperature.
Reaction of Grignard reagents with acyl chloride in ether followed by hydrolysis.

Solution :Grignard reagent reacting with acyl halide usually gives `3^(@)` alcohol.
Discussion
6258.

Which one is non narcotic drugs?

Answer»

Aspirin
Paracetamol
(A) and (B) both
Morphine

Solution :(A) and (B) both
Discussion
6259.

Write the IUPAC name of the following

Answer»

SOLUTION :3,3 - Dimethylpentan-2-ol
Discussion
6260.

Which of the following is habit forming drug?

Answer»

Ibuorofen
Aspirin
Codein
paracetamol

Answer :C
Discussion
6261.

The surface of separation of the two phases where the concentration of adsorbed molecule is high is known as .....

Answer»

SOLUTION :INTERFACE
Discussion
6262.

What happens when protein in denatured ?

Answer»

SOLUTION :The protein loses its bilogical activity due to CHANGES in its SECONDARY and tertiary structures. HOWEVER, during denaturation , primary structure remains intact.
Discussion
6263.

Which ion shows only the co-ordination number 4 in complexes :

Answer»

`PT^(2+)`
`Cr^(3+)`
`FE^(3+)`
`Pt^(4+)`

Answer :A
Discussion
6264.

Which of the following resonating structure of 1-methoxy - 1,3-butadiene is least stable?

Answer»

`OVERSET(Theta)CH_2-CH=CH-CH=overset(o+)O-CH_3`
`overset(Theta)CH_2-overset(o+)CH=CH-CH=O-CH_3`
`CH_2=CH_2-overset(Theta)CH-CH=overset(o+)O-CH_3`
`CH_2=CH_2-overset(Theta)CH-overset(o+)CH-O-CH_3`

Solution :In 1-Methyoxy-1,3-butadiene
`(CH_2=CH-CH=CH-underset(ddot)overset(ddot)O-CH_3)` there is conjuction between the lone pair on oxygen and pie bonds. Therefore, OPTIONS (A) and (B) are its correct resonating sturctures with COMPLETE octets of all the atoms. In structure (D) electron definciency of postiviely charged carbon is comprensated by lone pair ELECTRONS on adjucent oxygen atom while such neighbour group sppport is not available in structure that of OPTION (C).
Discussion
6265.

Write the structure of the major organic product in each of the following reaction : CH_(3)CH_(2)CH_(2)OH + SOCl_(2) to

Answer»

SOLUTION :Reactions giving the structure of main ORGANIC PRODUCT, are as under :
`underset("Propan -1-ol") overset("phenoxide") (CH_(3)CH_(2)CH_(2)OH) + SOCl_(2) underset("SUBSTITUTION") overset("Nucleophilic") to underset("1-Chloropropane") (CH_(3)CH_(2)CH_(2)Cl) + HCl + SO_(2) `
Discussion
6266.

The vapour pressure of the solution M is

Answer»

39.3 MM Hg
36.0 mm Hg
29.5 mm Hg
28.8 mm Hg

Answer :B
Discussion
6267.

Which one of the following is formed when phenol is heated with formalin?

Answer»

BAKELITE
POLYURETHANE
PVC
Polyester

Solution :Bakelite
Discussion
6268.

Which of the following reactions occurs at measurable rate?

Answer»

reaction between `H^(+)` and `OH^(-)` ions in aqueous solution
reaction between `AgNO_(3)` and `NaCl` aqueous SOLUTIONS
hydrolysis of methyl acetate
reaction between hydrogen and OXYGEN gases at room temperature

Answer :C
Discussion
6269.

The series limit for the Paschen series of hydrogen spectrum occurs at 8205Å. Calculate. a. Ionization energy of hydrogen atom. b. Wavelength of phton that would remove the electron in the ground state of the hydrogen atom.

Answer»


ANSWER :13.6ev, `916Å`
Discussion
6270.

Wchich is/are correct statement?

Answer»

LYOPHILIC COLLOIDS are irreversible
Lyophilic colloids do not migrate in ELECTRIC field
or migrate in any direction
In lyophobic colloids no hydration takes place
Lyophilic are more STABLE and lyophobic less
stable

Answer :B::C::D
Discussion
6271.

Which one is correct statements for zeolite ?

Answer»

Zeolites are ALUMINOSILICATES having three dimensional framework
Hydrate zeolites are used as ION exchangers in HARDENING of soft WATER
Zeolites are alumino silicates
all the above

Answer :D
Discussion
6272.

There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength

Answer»

0.03
0.04045
0.02509
0.03035

Solution :`[H_(2)O_(2)to H_(2)O +1/2 O_(2)]xx2`
`underset(68)(2H_(2)O_(2)) to 2H_(2)O +O_(2) ` 22.4l at N.T.P.
`:'` 22.4 l `O_(2)` at N.T.P. OBTAINED by 68 gm of `H_(2)O_(2)`
`:.` 10 l `O_(2)` at N.T.P. obtained by
`=68/22.4 xx10=30.35` gm/l
`:.` 1000 ML `O_(2)` at N.T.P. obtained by 30.35 gm
`:.` 100 ml `O_(2)` at N.T.P. obtained by `=30.35/1000xx100=3.035%`
Discussion
6273.

what is the ratio of moles of Mg(OH)_(2) and AI(OH)_(3) present in 1 litre saturated aqueous solution of Mg(OH)_(2) and AI(OH)_(3) (Given K_(sp) of Mg(OH)_2)=4xx10^(-12) asnd K_(sp) of AI(OH)_(3) is 1xx10^(-33)).Report your answer after multiplying by 10^(-17) .

Answer»


Solution :What is the ratio of …………….
`{:(Mg(OH)_(2),,hArr,Mg^(2+)+2OH^(-)),(,x, 2x+3y),(AI(OH)_(3),hArr,AI^(3+)+3OH^(-)),(,y,3y+2x):}`
Since `K_(ap)` of `Mg(OH)_(2)gt K_(ap)` of `AI(OH)_(3)`
`:. X GTGT y`,`:. 2x+3y~=2x`
`4xx10^(-12)= [Mg^(2+)][OH^(-)]^(2)`
`=x+(2x)^(2)`
`:. x= 10^(-4)`
Similary`1XX10^(-33)=[AI^(3+)][OH^(-)]^(3)`
`1xx10^(-33)=yxx(2x)^(3)`
`:. y = (10^(-21))/(8)`
Thus `(x)/(y) = 8xx10^(17)`
`:.` Ans. `= 8xx10^(+17) = 8`
Discussion
6274.

The value of x in the partial redox equation MnO_(4)^(-)+8H^(+)+xe^(-) hArr Mn^(2+)+4H_(2)O is

Answer»

5
3
1
0

Solution :`MnO_(4)^(-)+8H^(+)+5 e^(-) hArr MN^(++)+4 H_(2)O`.
Discussion
6275.

Why are powdered substances more effective adsorbent than their crystalline forms ?

Answer»

Solution :POWDERED substances have greater surface AREA as COMPARED to their crystalline forms for the same MASS. Greater the surface area, greater is the adsorption.
Discussion
6276.

The stopper of a bottle containing an ammonium salt is taken out. A strong smell of ammonia is given out. The salt is

Answer»

AMMONIUM chloride
ammonium SULPHATE
 ammonium CARBONATE
 ammonium nitrate

Answer :C
Discussion
6277.

What is formalin ?

Answer»

SOLUTION :It is a GAS. Its 40% aqueous solution is known as FORMALIN.
Discussion
6278.

Which alkene on ozonolysis gives acetone ?

Answer»

SOLUTION :1-propyne
Discussion
6279.

Write the structures of the alcohols with the molecular formula, C_5H12O which exhibit enantiomorphism.

Answer»

Solution :With formula `C_5H_12O` eight alcohol and six ether constitutional isomers are POSSIBLE. Among alcohols FOLLOWING three can exhibit enantiomerism.
1. `CH_3-overset(CH_3)overset(|)(CH)-underset(OH)underset(|)overset(**)(CH)-CH_3""2. CH_3-CH_2-CH_2-underset(OH)underset(|)overset(**)(CH)-CH_3""3. CH_3-CH_2-underset(OH)underset(|)overset(**)(CH)-CH_2OH`
Discussion
6280.

Which of the following system in octahedral complex has maximum unpaird electrons?

Answer»

`d^(7)` (high SPIN)
`d^(9)`(high spin)
`d^(6)` (LOW spin)
`d^(4)` (low spin)

Answer :A
Discussion
6281.

Which of the following gives phthalic acid on oxidation with KMnO_(4) ?

Answer»

o-Cresol
o-Methylphenol
o-Xylene
TOLUIDINE

ANSWER :A
Discussion
6282.

Which of the following solutions will exhibit highest boiling point?

Answer»

0.01 M urea
0.01 M `KNO_(3)`
0.01 M `N_(2)SO_(4)`
0.015 M glucose.

SOLUTION :`Na_(2)SO_(4)` will have maximum `DeltaT_(b)` as it will give maximum ions in solution.
Discussion
6283.

What happens when 1-phenyl ethanol is treated with acidified KMnO_(4) .

Answer»

SOLUTION :1-phenyl ETHANOL reacts with acidified `KMnO_(4)` to give Acetophenone .
Discussion
6284.

What is the maximum number of 'S' atoms in a single plane of S_(8) molecule.

Answer»

4
2
3
6

Solution :Sulphur has PUCKERED RING (or) crown SHAPE MOLECULE.

On same plane S-atoms = 4
Discussion
6285.

The total entropy change for a system and its surroundingsincreases, if the process is

Answer»

Reversible
Irreversible
Exothermic
Endothermic

Answer :B
Discussion
6286.

Which is correct graph :

Answer»




Solution :(A)`t_(x%) prop 1/a` for SEC. order
(B)RATE`=kC_t=kC_0e^(-kt)`
`ln(-(dc)/(dt))=ln(rate)="In"kC_0-kt`
So straight line
( C) `k=Ae^(-Ea//RT)`
rate =`k.("conc.")^n =Ae^(-Ea//RT)("conc.")^n`
`ln("rate")=-(Ea)/(RT)+` constant
slope=`(-Ea)/R`
(D)`t_(0.75)/t_(0.5)`=ratio of TIME is constant with initial conc.
Discussion
6287.

Which of the following species has shortest Bond length?

Answer»

`N_2^+`
`N_2`
`N_2^-`
`N_2^(2-)`

ANSWER :B
Discussion
6288.

Which of the folloiwngexist asa zwitterion ?

Answer»

sulphaniliceacid
sulphoniceacid
PHTHALICACID
Terephthalicacid

ANSWER :A
Discussion
6289.

Which of the following ions is discharged at the cathode when an aqueous solution of sodiumhydroxide is electrolysed ?

Answer»

HYDROGEN
Hydroxy1
Oxygen
SODIUM
Discussion
6290.

What are the unit of rate of a reaction ?

Answer»

SOLUTION :`"MOL"^(-1) I^(-1) s^(-1)`
Discussion
6291.

The stability order of the following resonance structures is

Answer»

`III lt II lt I `
`II gt I gt III`
`II lt I lt III`
`II gt II gt I`

SOLUTION :(I) A NEUTRAL STRUCTURE, which has COMPLETE octet is most stable resonatingstructure.
since, more electronegative atom consist negative charge. Hence, (II) is more stable as compared ot (III).
`therefore` Stability order `rarr III lt II lt I `
Hence, option (a) is CORRECT .
Discussion
6292.

Which of the following react with dilute H_(2)SO_(4) to form H_(2).

Answer»

Al
Pb
Zn
Mg

Solution :`2Al+3H_(2)SO_(4) to Al_(2)(SO_(4))_(3)+3H_(2): Zn+H_(2)SO_(4) to ZnSO_(4) +H_(2), Mg+H_(2)SO_(4) to MgSO_(4)+H_(2)`
Discussion
6293.

Which of the following combination is correct for the stability of the paramagnetic intermediate ?

Answer»

(III)(i)(Q)
(II)(i)(R)
(II)(i)(S)
(III)(IV)(R)

SOLUTION :
Discussion
6294.

The stability of +1 oxidations state among Al, Ga, In and TI increases in the sequence :

Answer»

TI lt In lt GA lt Al
In lt TI lt Ga lt Al
Ga lt In lt Al lt TI
A1 lt Ga lt In lt TI

Solution :Stability of +1 OXIDATION STATE due to inert pair effect TI > In > Ga > Al
Discussion
6295.

Unit cell can be classified into primitie and centred unit cells. Differentiate between primitive and centred unit cells.

Answer»

SOLUTION :In primitive unit cells, particles are located only at the CORNERS. In centred unit cells, particles are located at all corners and also at some other positions such as BODY centre, face centre and end CENTRES.
Discussion
6296.

The time required to pass 36,000 C through an electroplating bath using a current of 10 A is ________.

Answer»

30 mins
one HOUR
one hour 30 mins
two hours

Answer :B
Discussion
6297.

Which among the following will be named as dibromidobis (ethylenediamine) chromium (III) bromide -

Answer»

`[Cr(en)_(2)BR]Br_(2)`
`[Cr(en)_(2)Br_(2)]Br`
`[Cr(en)Br_(2)]Br`
`[Cr(en)_(3)]Br_(3)`

Solution :GENERAL CONCEPT.
Discussion
6298.

The shape of tungstic acid W_(3)O_(5)sol is ...........

Answer»

SPHERICAL
disc
PLATE LIKE
ROD like

SOLUTION :plate like
Discussion
6299.

The solubility of BaSO_4 in water is 2.42xx10^(-3)g*L^(-1) at 298K. The value of its solubility product (K_(sp)) will be ( Given molar mass of BaSO_4=233g*mol^(-1))

Answer»

`1.08xx10^(-10)MOL^2*L^(-2)`
`1.08xx10^(-12)mol^2*L^(-2)`
`1.08xx10^(-14)mol^2*L^(-2)`
`1.08xx10^(-8)mol^2*L^(-2)`

Solution :`K_(sp)=[Ba^(2+)][SO_4^(2-)]=S^2`
[S=solubility of `BaSO_4`(in `mol*L^(-1)`)]
`S=(2.42xx10^(-3))/(233)mol*L^(-1)=0.0103xx10^(-3)mol*L^(-1)`
`:.K_(sp)=(0.0103xx10^(-3))^2=1.06xx10^(10)mol^2*L^(-2)`
Discussion
6300.

What are the different oxidation states exhibited by the lanthanoids?

Answer»

Solution :LANTHANOID shows `(+2),(+3) and (+4)` OXIDATION states. (+3) oxidation state is most dominant among lanthanoids. (+2) and (+4) oxidation states are due to extra stability of vacant, half-filled or fully filled f-orbitals.
Discussion