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2401.

Which of the following is lanthenoid element?

Answer»

Ta
Tn
Lu
Rh

Answer :C
Discussion
2402.

Which of the following order regarding the stability of intemediates is not correctly arranged?

Answer»

`F_(2) OVERSET(..)(C) lt Cl_(2) overset(..)(C) gt Br_(2) overset(..)gt I_(2) overset(..)(C)`
`(C_(6) H_(5) )_(3) overset(..)(C) gt (C_(6) H_(5))_(2) overset(.)(CH) gt CH_(2)= CH - overset(.)(CH_(2))`
R - C `equiv bar(C) lt R_(2)C = bar(C) HLT R_(3) C - bar(C) H_(2)`
`(C_(6) H_(5))_(3) overset(+)(C) lt (C_(6) H_(5))_(2) C^(+) gt CH_(2)^(+) - CH = CH_(2)`

Solution :(c) : (a) Due to backbonding, the stability of `CF_(2)` (singlet) is more than the other.
(b) More the number of phenyl group, more is the stability of radical attached to it.
R - C `equiv bar(C) gt R_(2) C = UNDERSET(("electronegativity basis"))(bar(C)H gt R_(3) C - bar(C)H_(2) ) `
(d) `(C_(6) H_(5))_(3) overset(+)(C) gt (C_(6) H_(5))_(2) overset(+)(CH) gt H_(2) C = CH - overset(+)(CH_(2)) `
Discussion
2403.

Which element in 3d series show (+1) oxidation state?

Answer»

Zn
Cu
Ni
Sc

Answer :B
Discussion
2404.

The total number of products obtained in above reaction is .

Answer»


SOLUTION :
Discussion
2405.

Which of the following is not formed at Antarctica ?

Answer»


`R-OVERSET(O)overset(||)C-O-O-NO_2 `
Type-I CLOUDS
POLAR vortex

Solution :`R-overset(O)overset(||)C-O-O-NO_2 `
Discussion
2406.

Which one of the following arrangements of molecules is correct on the basis of their dipole moments ?

Answer»

`BF_(3)gt NF_(3)gt NH_(3)`
`NF_(3)gt BF_(3)gt NH_(3)`
`NH_(3)gt BF_(3)gt NF_(3)`
`NH_(3)gt NF_(3)gt BF_(3)`

ANSWER :D
Discussion
2407.

Which one of the following gives imine formation with carbonyl compounds

Answer»

`C_6H_5-NH-C_6H_5`
`NH_4Cl`
`R_3N`
`C_6H_5NH_2`

ANSWER :D
Discussion
2408.

When vapours of an alcohol are passed over hot reduced copper, it gices an alkene. The alcohol is

Answer»

PRIMARY
SECONDARY
TERTIARY
primary and secondary

ANSWER :C
Discussion
2409.

Which oxide is least stable at room temperature ?

Answer»

`CUO`
`Ag_2O`
`ZNO`
`Sb_2O_3`

ANSWER :B
Discussion
2410.

What is theaction of acetyl chloride on triethyl amine ?

Answer»

Solution :TRIETHYL AMINE, being a tertiary amine does not have H atom attached to nitrogen of amine, hence it does not react with acetyl chloride.
`underset("triethyl amine")((C_(2)H_(5))_(3)overset(..)(N))+CH_(3)-overset(O)overset("||")C-Cl underset(DELTA) overset("PYRIDINE")to "No reaction" `
Discussion
2411.

Which of the following compounds will not give positive iodoform test. Acetophenone, Benzophenone, 2-Pentanone, 3-Pentanone, Acetaldehyde, CH_(3)COCH_(3), (CH_(3))_(2)CHOH, (CH_(3)CH_(2))_(2)CH-OH, CH_(3)COOH, CH_(3)CONH_(2), CH_(3)COOCH_(3), CH_(3)COCl

Answer»


Solution : `(CH_(3)-UNDERSET(O)underset(||)(C )-)` group give positive iodoform TEST but acids and ACID DERIVATIVES do not.
Discussion
2412.

Which reagent mixture is used in Dow process ?

Answer»

CHLOROBENZENE + 6 - 8% NaOH
Chlorobenzene + 6-8% HCI
Chlorobenzene + 6-8% `NH_(4)OH`
Chlorobenzene + 6-8% `Na_(2)CO_(3)`

Solution :Chlorobenzene + 6 - 8% NaOH
Discussion
2413.

What is the hybridization of central C-atom in trimethyl carbonium ion ?

Answer»

`SP`
`sp^(2)`
`sp^(3)`
`sp^(2)` and sp.

ANSWER :C
Discussion
2414.

Which of the following sketches is an isobar ((nR)/Pgt1)

Answer»

<P>


Solution :At CONSTANT pressure
PV-nRT.
`V=((NR)/P)`So, log V=log `((nR)/P)`+log T.
y=C+mx.
Discussion
2415.

Which of the following does not influence the reaction rate?

Answer»

NATURE of reactants
Conc. Of reactants
Temparature of the reaction
Molecularity of the reaction

Answer :D
Discussion
2416.

Which of the following has the greatest angle strain ?

Answer»

METHYL cyclobutane
methyl cyclopentne
methyl cyclohexane
methyl cyclopropane

Answer :D
Discussion
2417.

Using IUPAC norms write the formulae for the following : (i) Sodium dicyanidourate (ii) Tetraammine chloridonitrito-N-platinum (IV) sulphate or (i) Tris(ethane-1, 2-diamine) chromium (III) chloride (ii) Potassium tetrahydroxozincate (II) or (i) Potassium trioxalatoaluminate (III) (ii) Dichloridobis (ethane-1, 2-diamine) cobalt (III)

Answer»

Solution :(i)`Na[U(CN)_(2)]` (ii) `[Pt(NH_(3))_(4)Cl(NO_(2))]SO_(4)`
or (i) `[Cr(en)_(3)]Cl_(3)` (ii) `K_(2)[Zn (OH)_(4)]`
or (i) `K_(3)[AL(C_(2)O_(4))_(3)]` (ii) `[CoCl_(2)(en)_(2)]^(+)`
Discussion
2418.

Which of the following nutrients is increased on sprouting the pulses such as sprouted black gram or bengal gram

Answer»

VITAMIN A
Vitamin B
Vitamin C
Iron

Answer :D
Discussion
2419.

The size of colloidal particles ranges between

Answer»

SOLUTION :1-1000 NM.
Discussion
2420.

Which of the following gives negative iodoform test

Answer»

`CH_(3)CH_(2)OH`
`CH_(3)CH_(2)CH_(2)OH`
`C_(6)H_(5)-UNDERSET(OH)underset(|)CH-CH_(3)`
`CH_(3)-underset(OH)underset(|)CH-CH_(3)`

Answer :B
Discussion
2421.

Y overset(Na)(larr) X overset(conc.H_2SO_4 . 413 K)(to) (C_2H_5)_2OWhat are X and Y in the above reactions ?

Answer»


ANSWER :C
Discussion
2422.

Werner's theory could not explain :

Answer»

Directional properties of bonds in co-ordinaton compounds
Characteristic magnetic and optical properties of co-ordination compounds
Why only certain elements POSSESS the REMARKABLE property of forming co-ordination compounds
Why co-ordination number 6 GIVES octahedral complexes only\

Answer :A::B::C
Discussion
2423.

When CuSO_(4) is treated with excess of aq. KCN solution, the species formed is

Answer»

`[Cu(CN)_(4)]^(2-)`
`[Cu(CN)_(4)]^(3-)`
`Cu(CN)_(2)`
`Cu_(2)(CN)_(2)`

Solution :`2CuSO_(4)+10KCNrarr2K_(3)[Cu(CN)_(4)]+(CN)_(2)+2K_(2)SO_(4)`
Discussion
2424.

Which of the following groups will increase the acidity of acids:

Answer»

ELECTRON WITHDRAWING
Electron RELEASING
BOTH (A) AND (B)
None

Answer :A
Discussion
2425.

Which of the following complex species does not involve d^2sp^3 hybridisation?

Answer»

`[CoF_6]^(3-)`
`[Co(NH_3)_6]^(3+)`
`[FE(CN)_6]^(3-)`
`[Cr(NH_3)_6]^(3+)`

ANSWER :A
Discussion
2426.

Which of the following products does not match correctly with the reaction?

Answer»




SOLUTION :`CH_3CH_2CH=CH_2+HBr OVERSET("PEROXIDE")CH_3CH_2CH_2CH_2Br`
Discussion
2427.

What reagent can be used for the following conversation ? HC = CH rarrH_2C = CH_2.

Answer»

SOLUTION :`H_(2) //Pd-CaCO_(3)`
Discussion
2428.

This type of deviation is also expected in the following mixture :

Answer»

ETHANOL and cyclohexane
ETHYL bromide and ethyl chloride
benzonitrile and ethyl CYANIDE
DIETHYL ether and chloroform

ANSWER :D
Discussion
2429.

Trimethyl amine has

Answer»

PLANAR GEOMETRY
trigonal bipyramidal geometry
PYRAMIDAL shape
octahedral geometry

Solution :
TRIMETHYLAMINE has pyramidal geometry.
Discussion
2430.

Which of the following reactions leads to the formation of a substance in colloidal state?

Answer»

`2HNO_3+3H_2S to 3S+3H_2O+2NO`
`SnCl_2+HgCl_2 to SnCl_2+Hg`
`2Mg+CO_2 to 2MgO+C`
`Cu+CuCl_2 to Cu_2Cl_2`

Solution :DUE to oxidation of `H_2S` by `HNO_3` colloidal PARTICLES of SULPHUR (`S_8`) are FORMED. In other CASES, particles of colloidal size are not formed.
Discussion
2431.

Transition of electron from n=3 to n=1 levelresults in

Answer»

INFRARED SPECTRUM
EMISSION spectrum
Band spectrum
X-ray spectrum

ANSWER :B
Discussion
2432.

Two electrochemical cells are assembled in which the following reactions occur V^(2+)+VO^(2+)+2H^(+) to 2V^(3+)+H_(2),E_(cell)^(@)=0.616V V^(3+)+Ag^(+)+H_(2)toVO^(2+)+2H^(+)+Ag(s),E_(cell)^(@)=0.439V Calculate the E^(@) value for the half-cell reaction V^(3+)+e^(-)toV^(2+). (Given: E_(Ag^(+)//Ag)^(@)=0.799volt) lt

Answer»

Solution :Two half CELLS for the 1st cell reaction will be
(i) `V^(2+)toV^(3+)+e^(-),E_(1)^(@)(O x)`
(ii) `VO^(2+)+2H^(+)+e^(-)toV^(3+)+H_(2)O,E_(2)^(@)(red.)`
Two half-cells for the 2ND cell reaction will be
(iii) `V^(3+)+H_(2)OtoVO^(2+)+2H^(+)+e^(-),E_(3)^(@)(O x),`
(iv) `AG^(+)+e^(-)toAg,E_(4)^(@)(Red).0.799V` (given)
`E_(3)^(@)+E_(4)^(@)=0.439V`
`thereforeE_(3)^(@)(O x.)=0.439-E_(4)^(@)=0.439-0.799=-0.360V`
As reaction (ii) is reverse of reaction (iii)
`E_(2)^(@)(Red.)=-E_(3)^(@)(O x.)=+0.360V`
Further, `E_(1)^(@)(O x)+E_(2)^(@)(Red.)=0.616`
or `E_(1)^(@)(O x.)=0.616-E_(2)^(@)(Red.)=0.616-0.360=0.256V`
As required reaction is reverse of reaction (i)
`E^(@)`(Reqd. reaction)=-0.256V
Discussion
2433.

Write the structure of the following compounds. (i) Phenyl methanol (ii) 1-Phenyl ethanol (iii) 2-Phenyl propan-2-ol

Answer»

SOLUTION :(i) `C_6H_5 - CH_2OH`Phenyl methanol
(ii) `C_6H_5 -underset(CH_3)underset(|)CH - OH`1- Phenyl ETHANOL
(iii) `C_6H_5 - underset(CH_3)underset(|)overset(CH_3)overset(|)C -OH`2-Phenyl propan - 2- OL
Discussion
2434.

The sequence in which amino acids are linked to one another in a protein is called its :

Answer»

PRIMARY STRUCTURE
secondary structure
TERTIARY structure
quaternary structure

ANSWER :A
Discussion
2435.

Write the electronic configuration and find the no. of unpaired electrons as well as total spin for the following atoms: (i) _(6)C (ii) _(8)O (iii) _(15)P (iv) _(21)Sc (v) _(26)Fe (vi) _(10)Ne

Answer»

Solution :
`THEREFORE` No. of UNPAIRED electrons = 2
`therefore` TOTAL spin `=(+2)/(2)` or `(-2)/(2)`

`[Ar] 3d^(1)4S^(2)`
`therefore`No. of unpaired electrons = 1
`theredore` Total spin `=(+1)/(2)` or `(-1)/(2)`
Discussion
2436.

Which of the following aqueous solution will have the boiling point 102.2^(@)C ? The molar elevation constant for water is 2.2 K kg mol^(-1).

Answer»

1M NaCl
1m glucose
1M NaCl
`1m CH_(3)COOH`

SOLUTION :`m=1, Delta T_(b)=2.2 K, K_(b)=2.2 " K kg mol"^(-1)`
`Delta T_(b)=i.K_(b).m`
`2.2=ixx2.2xx1`
`therefore i=1 ""` For glucose, `i=1`
Discussion
2437.

Which one of the following is the other name of nylon 6,6?

Answer»

POLY urethane
urotropine
poly caprolactum
poly hexametheylene adipamide

Solution :poly hexametheylene adipamide
Discussion
2438.

Which of the following is FALSE regarding the acetylation of amines?

Answer»

Acetylation can be AFFECTED by ACID anhydride or ACETYL chloride.
Ethylamine on acetylation gives N-acetylethylanine.
Diethylamine in acetylation gives N-acetyldiethylamine.
Triethylamine on acetylation gives N,N-diacetylethylamine.

Answer :D
Discussion
2439.

The Yb ^(2+) and Lu ^(3+) ion has electronic configuration

Answer»

`4f ^(14) 5D^(1) 6s^(0)`
`4f^(14) 5d^(0) 6s^(0) and 4f^(14) 5d^(1)6s^(0)` respectively
`4f^(14) 5d^(0)6s^(0)`
`4f^(14) 5d^(1) 6s^(2)`

Answer :C
Discussion
2440.

What are elastomers ? Write chemical equation to prepare Buna-S.

Answer»

SOLUTION :They are POLYMERS in which POLYMERIC CHAINS are held TOGETHER by the weakest intemolecular forces.
Discussion
2441.

Whichofthefollowingoptionsarecorrect ?

Answer»

Castironisobtainedbyremeltingpigironwithscrap ironandcokeusing HOT airblast.
In extractionofsilver,silverisextractedascationiccomplex
Nickelis purifiedbyzonerefining
Zr andTiare purifiedbyvanArkelmethod

Solution :SILVERIS extracted asanionicspecies , `[Ag(CN)_2]^(-) `andNiispurifiedbyMond'sprocess.Thus, OPTION(a) and(d)are correct.
Discussion
2442.

Which of the following is an ore of magnesium ?

Answer»

Asbestos
Cinnabar
Cryolite
Glauber's salt

Answer :A
Discussion
2443.

Which one is antiseptic ?

Answer»

POTASSIUM permanganate
Furacin
Soframycin
All of the GIVEN 

SOLUTION :All of the given
Discussion
2444.

Which of the following methods of preparation of amines will not give same number of carbon atoms in the chain of amines as the the reactant ?

Answer»

Reaction of nitrite with `LiAlH_4`
Reaction of amide with `LiAlH_4`followed by treatment with water
Heating alkylhalide with potassium SALT of phthalimide followed by hydrolysis
Treatment of amide with BROMINE in aqueous solution of sodium hydroxide.

Solution :`UNDERSET("Amide")(RCONH_2)overset(Br_2 //NaOH)tounderset("Amine with one C-atom less than the amide")(RNH_2)`
Only treatment of amide with `Br_2` in aqueous solution of NaOH wil give an amine with lesser number of CARBON atoms than in the reactant.
Discussion
2445.

Which compound will react with an aqueous solution of Ag(NH_3)_2^(+)OH^-

Answer»

`CH_2=CH_2`
`CH_3-CH_2`
`CH_3CH_2C-=CH`
`CH_3-C-=C-CH_3`

SOLUTION :BECAUE `CH_3CH_2-C-=CH` has ONE ACIDIC HYDROGEN
Discussion
2446.

Which of the following anion has the smallest radius?

Answer»

`H^(-)`
`F^(-)`
`Cl^(-)`
`Br^(-)`

ANSWER :B
Discussion
2447.

Up to which temperature, natural rubber do not become soft ?

Answer»

273 K
335 K
553 K
445 K

Solution :335 K
Discussion
2448.

Write the names of the products when sucrose is hydrolysed ?

Answer»

SOLUTION :GLUCOSE and FRUCTOSE.
Discussion
2449.

Which of the following statements(s) is/are incorrect for SF_(4) molecule?

Answer»

It has a square planar SHAPE with S- atom having two lone pairs
All S-F bonds are equal in length
It is hydrolysed by WATER
`H_(2)SO_(4)` is the final product during the hydrolysis of `SF_(4)`

ANSWER :A::B::D
Discussion
2450.

What is the minimum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl_2 and saturated with 0.10 M H_2S? Given K_(sp) of ZnS=10^(-21) , for H_2S K_(a_1)xK_(a_2)=10^(-20)

Answer»


SOLUTION :`K_(sp)=[ZN^(2+)][S^(-2)]`
:. [5^2]=10^(-21)/10.01=10^(-19)`
`K_(a_1)xxK_(a_2)=([H^+]^(2)[10^(-19)])/0.1implies 10^(-20)=([H^+]^(2)[10^(-19)])/0.1`
`[H^+]=10^(-1)`
pH=1
Discussion