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21701.

Which of the following is non-ionic reaction ?

Answer»

`R-H+Br_(2) overset(AlBr_(3)) to`
`R-H+Br_(2) overset("U.V.light") to`
`CH_(2)=CH_(2)+HBr to `
`R-X+OH^(-) to`

ANSWER :B
Discussion
21702.

Which of the following compounds is oxidised to prepare methyl ethyl ketone

Answer»

2- propanol
1-butanol
2-butanol
Tert-butyl alcohol

Solution :`CH_(3)-UNDERSET(OH)underset(|)CH-CH_(2)-CH_(3)OVERSET([o])to CH_(3) - overset(O)overset(||)C-CH_(2)CH_(3)`
Discussion
21703.

What is the electrode potential for following reaction ? E_(Fe^(+3)|Fe)^(o)=-0.036V,E_(Fe^(2+)|Fe)^(o)=-0.439V Fe^(3+)+e^(-) to Fe^(2+).

Answer»

`-0.072V`
`0.385` V
0.770 V
`-0.270V`

Solution :(i) `Fe^(3+)+3E^(-) to Fe,`
`E_(1)^(o)=-0.036V,DeltaG_(1)^(@)=-3xxFxx(-0.036)`
(II) `Fe^(2+)+2e^(-) to Fe,`
`E_(2)^(@)=-0.439V,DeltaG_(2)^(@)=-2xxFxx(-0.439)`
Required REACTION :
`Fe^(3+)+e^(-) to Fe^(2+)` REDUCTION, `DeltaG_(3)^(@)=-1xxFxxE_(3)^(@)`
SUBTRACT (ii) from (i),
`DeltaG_(3)^(@)=DeltaG_(1)^(@)-DeltaG_(2)^(@)`
`(-1)xxFxxE_(3)^(@)=[-3xxFxx(-0.036)]-[(-2xxFxx-0.439)]`
`therefore -E_(3)^(@)=(0.108-0.878)`
`therefore E_(3)^(@)=(-0.108+0.878)`
`therefore E_(3)^(@)=0.77V`.
Discussion
21704.

What form will Freundlich adsorption isotherm equation take at high pressure ?

Answer»

Solution :At HIGH PRESSURE, x/m BECOMES INDEPENDENT of pressure. Hence, Freundilich equation becomes `x/m=kP^(o)=k.`
Discussion
21705.

Which will increase the voltage of the cell Sn(s) +2Ag^+(aq)rarr Sn^(2+)(aq)+2Ag(s):

Answer»

Increasein SIZE of the silver rod
Increase in the CONCENTRATION of `Sn^(2+)` ions
Increase in the concentration of `AG^+`ions
None

Answer :C
Discussion
21706.

What is the role of cryolite in the extraction of aluminium?

Answer»

Solution :The role of CRYOLITE is to LOWER the MELTING point and alumina which speeds up the ELECTROLYSIS process.
Discussion
21707.

Unmatched characteristic of complex [PdCl_(2)(H_(2)O)_(2)(NH_(3))_(2)]^(2+) is:

Answer»

Diamagnetic
Low spin
Geometrical isomerism
Fac. And MER. Form

Solution :
(d) `Ma_(3)b_(3)` type complex SHOW fac and mer form and this complex is `Ma_(2)b_(2)c_(2)` type, so does not show fac and mer form.
Discussion
21708.

Which of the following compound is most reactive toward S_(N)2 displacement ?

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)-CL`
`(CH_(3))_(3)C-Cl`
`CH_(3)-UNDERSET(CH_(3))underset(|)(CH)-underset(Cl)underset(|)(CH)-CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-Cl`

Answer :A
Discussion
21709.

Which of the following solids is not an electrical conductor ? (i) Mg_((s)) (ii) TiO_((s)) (iii) I_(2_(s)) (iv) H_2O_((s))

Answer»

(i) only 
(ii) Only 
(iii) and (iv) 
(ii), (iii) and (iv)

Solution :`Mg_((s))` is metallic solid where there are free ELECTRONS. The POSITIVE CHARGED KERNELS are present in SEA of electrons.
Discussion
21710.

Which of the following acids is isomeriic with phthalic acid

Answer»

Succinic ACID
Salicylic acid
1,4-benzene dicarboxylic acid
Methyl BENZOIC acid

Solution :Phthalic acid is the isomer of 1,4 benzene dicarboxylic acid because both have the sae MOLECULAR formula but DIFFER in their structure.
Discussion
21711.

The tendency to show complex formation is maximum in:

Answer»

s-block elements
p-block elements
d-block elements
f-block elements

Answer :C
Discussion
21712.

What is the average molecular mass of drugs ?

Answer»

Solution :Drugs are the chemicals of low MOLECULAR masses i.e., (-100-500u). They INTERACT with macromolecular targets and targets and produce a BIOLOGICAL response. When the biological response in therapeutric and USEFUL, these chmicals are called medicines.
Discussion
21713.

Which of the following alkyhalidesshow opticalisomerism ?

Answer»

2-Bromobutane
Isobutylbromide
Neopenthylbromide
1, 4-dichlorobutane

SOLUTION :
Discussion
21714.

Which one of the following is employed as a tranquilizer ?

Answer»

Naproxen
Tetracycline
Chlorpheninamine
Equanil

Answer :D
Discussion
21715.

What are narcotic and non- narcotic drugs? Give examples.

Answer»

SOLUTION :Narcotic and non-narcotic drugs:
(i) Narcotic drug is an ADDICTIVE drug that reduces pain, induces sleep and may ALTER mood or behaviour. Example : Morphine and CODEINE.
ii. Non-narcotic drug are chemical substance (medications) used to control pain and inflammation. They are available at drugstores (medications) used to control pain and inflammation. They are available at drugstoreswithout a prescription or by prescription when given at a higher doses. Example : Acctaminophen and paracetamol.
Discussion
21716.

Which of the following has INCORRECT order of their indicating properties ?

Answer»

`F-hatC-F(CH_2F_2) GT H - hatC-H (CH_4)` , bond angle
`H_3C - Cl gt F_3C - Cl` , bond LENGTH of C-Cl
`(CH_3)_3N gt (SiH_3)_3N` , BASIC strength
`PH_3 LT PF_3` , bond angle

Answer :A
Discussion
21717.

Which one of the nitrogen atoms in underset(I)(H_(2)N)-underset(II)(NH)-overset(O)overset(||)C-underset(III)(NH_(2))is/are strong nucleophilic centers

Answer»

III
I
II
All three nitrogen atoms are equally strong nucleophilic centers.

Solution :`underset((I))(H_(2)N)-underset((II))(NH)-overset(O)overset(||)C-underset((III))(NH_(2))`
(I) is the most nucleophilic nitrogen because it is fat to CARBONYL group and remaining NITROGENS are nearer to carbonyl group and involve in resource very quickly.
Discussion
21718.

Which of the two: physical adsorption and chemisorption has higher heat of adsorption ?

Answer»

SOLUTION :Chemical ADSORPTION has HIGHER heat orf adsorption
Discussion
21719.

The species which will not show hyperconjugation is

Answer»

`CH_3C^(+)H_2`
`(CH_3)_3C``C^(+)H_2`
`CH_3CH_2C^(+)H_2`
`CH_3C^(+)HCH_2`

ANSWER :B
Discussion
21720.

What are vitamins? Name any two diseases caused by deficiency of vitamins A. Write the structures of (a) nucleoside (b) nucleotide. How are I-nitropropane, 2-nitropropane and 2-methy-2 nitropropane are distinguised from each other using nitrous acids?

Answer»

Solution :Vitamins are the organic substance that must be SUPPLIED to permit proportionate growth in living being or for the maintenance of the STRUCTURE.
Diseaes: 1. Night blindness
2. Retardation of growth
3. DRYNESS of hair and skin

Primary nitroalkane reacts with NITROUS acid to form blue COLOURED nitroso-nitro propane which reacts with NaOH to give red colour solution.
`CH_(3) - underset(H)underset(|)overset(H)overset(|)(C )- underset(H)underset(|)overset(H)overset(|)(C ) -overset(O)overset(||)(N) - O + HO - N = O to

When 2-nitropropane is treated withh nitrous acid it gives blue coloured nitro-nitroso propane which do not react with NaOH due to absence of alpha hydrogen.
`CH_(3) - underset(H)underset(|)overset(CH_(3))overset(|)(C ) - overset(O)overset(|)(N) - O + HO - N = O to` CH_(3) - underset(NO)underset(|)overset(CH_(3))overset(|)(C ) - overset(O)overset(||)(N) - O + H_(2) O`
2-methyl 2-nitropropane does not react with nitrous acid due to absence of alpha hydrogen.
Discussion
21721.

Which of the following is an example of induced radioactivity ?

Answer»

`""_(4)^(9)Be+""_(2)^(4)Heto""_(6)^(12)C+""_(0)^(1)n`
`""_(12)^(24)MG+""_(2)^(4)Heto""_(14)^(27)SI+""_(0)^(1)n`
`""_(4)^(9)Be+""_(1)^(1)Heto""_(5)^(10)B+gamma`
`""_(1)^(2)H+gammato""_(1)^(1)H+""_(0)^(1)n`

Answer :B
Discussion
21722.

Which of the following is not an electrophile

Answer»

`H_(3)O^(+)`
`BH_(3)`
`CH_(3)^(+)`
`ZnCl_(2)`

ANSWER :A
Discussion
21723.

Which is not a poison for enzymes:

Answer»

`CN^-`
`FE^(3+)`
`Pb^(2+)`
`As_4^(3-)`

Answer :B
Discussion
21724.

Which of ther following statement is correct about P_(3) ?

Answer»

It can give Cannizzaro's reaction
It will give vicinaldihalides with `PCl_(5)`
it can give CARBYLAMINE test
It will give MESITYLENE when heated with conc. `H_(2)So_(4)`

Solution :N//A
Discussion
21725.

Which one of the following compounds reacts with saturated solution of sodium bisulphite to give colourless crystalline products?

Answer»

`C_2H_5OH`
`C_2H_6`
`CH_3CHO`
`CHCl_3`

ANSWER :C
Discussion
21726.

Write the structures of (i) peroxomonosulphric acid and (ii) peroxodisulphuric acid and find out the oxidation number of sulphur in them.

Answer»

Solution :(i) `underset("O.N. of S = 2 (+1)+ 2 (-1) + 3 (-2) + x = 0 or x = +6")underset("Peroxomonosulphric acid"(H_(2)SO_(5)))(OVERSET(+1)(H)-overset(-1)(O)-overset(-1)(O)-underset(underset(-2)(O))underset(||)overset(overset(-2)(O))overset(||)(S)-overset(-2)(O)-overset(-1)(H))`
(ii) `underset("O.N. of S = 2 (+1) + 2(-1) + 6(-2)+2x = 0 or x = +6")underset("Peroxodisulphuric acid"(H_(2)S_(2)O_(8)))(overset(+1)(H)-overset(-2)(O)-underset(underset(-2)(O))underset(||)overset(overset(-2)(O))overset(||)(S)-overset(-1)(O)-overset(-1)(O)-underset(underset(-2)(O))underset(||)overset(overset(-2)(O))overset(||)(S)-overset(-2)(O)-overset(+1)(H))`
Discussion
21727.

Which rubber is used to prepare oil seal ?

Answer»

BUTADIENE
NITRILE
Vulcanized
LATEX

SOLUTION :Nitrile
Discussion
21728.

Which of the following methods cannot be used to prepare allyl fluoride?

Answer»

`ClCH_(2)CH=CH_(2)OVERSET("NaF, acetone")to`
`CH_(3)CH=CH_(2)+F_(2) overset(hv)to`
`HOCH_(2)CH=CH_(2)overset(HF)to`
`ClCH_(2)CH=CH_(2)+AgF to`

SOLUTION :Alkyl fluorides are more conveniently prepared by Swartz reaction, i.e., OPTION (d) is CORRECT.
Discussion
21729.

Which is not true , in case of transition metals :

Answer»

They are malleable and ductile
They have high MELTING and BOILING points
They crystallise with BODY centred cubic and hexagonal CLOSE packed structure only
They shows variable oxidation state althought not always

Answer :C
Discussion
21730.

Who discovered the first antibiotic ? Name the antibiotic discovered .

Answer»

SOLUTION :The first ANTIBIOTIC was DISCOVERED by Alexander FLEMING in 1929. The first antibiotic was penicillin.
Discussion
21731.

What is anhydride of nitric acid?

Answer»

SOLUTION :`N_2O_5`
Discussion
21732.

Which of the following is a ferrous alloy ?

Answer»

Invar
Solder
Magnalium
Type metal

Answer :A
Discussion
21733.

Which fertilizer is assimilated directly by the plant ?

Answer»

Super PHOSPHATE
LIMESTONE
Muriate of POTASH
Humus

Solution :Muriate of potash is ASSIMILATED directly by the plant.
Discussion
21734.

Which one of thefollowingexhibitshighestoxidationstate ?

Answer»

`Ni `
`MN `
`V`
`ZR`

ANSWER :B
Discussion
21735.

Which of the following is the correct decreasing order of basicity of amines in gaseous phase?

Answer»

`(CH_(3))_(2)NH gt CH_(3)NH_(2) gt (CH_(3))_(3)N gt NH_(3)`
`(CH_(3))_(3)N gt (CH_(3))_(2)NH gt CH_(3)NH_(2) gt NH_(3)`
`(CH_(3))_(2)NH gt (CH_(3))_(3) N gt CH_(3)NH_(2) gt NH_(3)`
`(CH_(3))_(3)N gt CH_(3)NH_(2) gt (CH_(3))_(2)NH gt NH_(3)`

Solution :In the GASEOUS phase, BASICITY INCREASES as the +I-effect of the alkyl groups increases. THUS, option (b) is correct.
Discussion
21736.

Which of the following ion has highest ionic radius?

Answer»

`CR^(+3)`
`MN^(+3)`
`FE^(+3)`
`CO^(+3)`

Answer :A
Discussion
21737.

Which of the following is not the possible product of dehydration of in acidic medium ?

Answer»




Solution :ACID catalysed DEHYDRATION OCCURS via CARBOCATION INTERMEDIATE
Discussion
21738.

What are the assumptions of Crystal Field theory.

Answer»

Solution :(i) Ligand act as a point CHARGE.
(II)METAL ion has electrostatic ATTRACTION FORCE with the legand. (Or any other)
Discussion
21739.

Which of the following compounds do not readily give SN^2 reaction

Answer»


ph-Br

SOLUTION :
UNSTABLE EITHER `SN^2` and `SN^1` RXN is not POSSIBLE
Discussion
21740.

Which of the following order of L.E. is not correct :-

Answer»

`Al_(2)O_(3) lt MgO lt Na_(2) O`
`NaF lt MgO lt ScN lt TIC`
`KBr lt LIF lt MgO`
`LiF gt NaF gt KF`

SOLUTION :Order of `L.E rArr A_(2)B_(3) gt AB gt A_(2)B`
Discussion
21741.

The standard electrode potentials for the ractions Ag^(+)(aq)+e^(-) rarr Ag(s) sn^(+)(aq)+2e^(-)rarrSn(s) at 25^(@)C are 0.80 V and -0.14 V respectivelythe emfof the cell Sn|Sn^(2+)|(1 M)|Ag^(+)(1M)| Ag is

Answer»

0.48 V
0.80 v
1.08 V
0.94 V

Solution :EMF of the CELL `=E_("left")-E_("RIGHT")`
`=0.80 (-0.14) =0.94 V`
Discussion
21742.

When a lead storage battery is discharged

Answer»

`SO_(2)` is evolved
Lead sulphate is CONSUMED
Lead is formed
Sulphuric acid is consumed

Solution :`Pb+PbO_(2)+2H_(2)SO_(4) UNDERSET("recharge")OVERSET("Discharge")hArr2PbSO_(4)+2H_(2)O`
Sulphuric acid is consumed on DISCHARGING.
Discussion
21743.

Which one of the following is s-butyl phenyl vinyl methane?

Answer»




ANSWER :B
Discussion
21744.

Which of the following is incorrect about S_8 molecule

Answer»

No. of LONE PAIRS : 16
covalency : 2
Bond ORDER : 1
Bond LENGTH : 205.7 pm

Answer :D
Discussion
21745.

Which of the following is (are) soluble in excess of NaOH?

Answer»

`Cr(OH)_(3)`
`FE(OH)_(3)`
`Al(OH)_(3)`
`ZN(OH)_(2)`

Answer :C,d
Discussion
21746.

Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true ?

Answer»

The `DELTA G^(@)` of the SULPHIDE is greater than those of `CS_(2) " and " H_(2)S`.
The `DeltaG^(@)` is negative for ROASTING of sulphide ore to oxide.
Roasting of sulphide to oxide is thermodynamically feasible
Carbon and hydrogen are not SUITABLE reducing agents for metal sulphides.

Solution :Both C and `H_(2)` are not suitable for reducing sulphide ore because `Delta_(f)G^(@)` of metal sulphide is more than that of `CS_(2) " and H_(2)S` which will be formed as result of redcution.
Discussion
21747.

Write IUPAC name of [Co(NH_(3))_(5)ONO]^(2+).

Answer»

SOLUTION :Pentaamminenitrito-O-cobalt(III) ION.
Discussion
21748.

Which substance is added in shaving soap so as it foams well ?

Answer»

GLYCEROL 
ROSIN 
ESTER 
POLYETHYLENE 

SOLUTION :Rosin
Discussion
21749.

Two faraday of electricity is passed through a solution of CuSO_(4). The mass of Cu deposited at the cathode is (Atomic mass of Cu = 63.5 u)

Answer»

0 g
63.5 g
2 g
127 g

Answer :B
Discussion
21750.

The solubility of iodinein water may be increased by adding :

Answer»

POTASSIUM iodide
Chloroform
Carbon disulphide
Sodium thiosulphate.

Answer :C
Discussion