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2701.

Which statement about protein is wrong:

Answer»

Proteins occur in all LIVING cells
Proteins invariably contain N, O, C and H
Proteins are synthesised by plant kingdom only
Proteins are also synthesised in laboratory

Answer :D
Discussion
2702.

Which of the following is not optically active ?

Answer»

`[CO(EN)_(3)]^(3+)`
`[Cr("OX")_(3)]^(3-)`
`cis-[CoCl_(2)(en)_(2)]^(+)`
`trans-[CoCl_(2)(en)_(2)]^(+)`

Solution : [POS and COS present]
Discussion
2703.

What is the simplest formula of a solid whose cubic unit cell has the atom A at each corner, the atom B at each face centre and a C atom at the body centre?

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Solution :An ATOM at the corner of a cube is SHARED among 8 unit cells. As there are 8 corners in a cube, NUMBER of corner atom (A) per unit cell `=8 xx 1/8=1`
A face-centred atom in a cube is shared by two unit cells. As there are 6 faces in a cube, number of face-centred atoms (B) per unit cell =` 6 xx 1/2=3`
An atom in the body of the cube is not shared by other cells.
`therefore`number of atoms (C) at the body CENTRE per unit cell = 1. Hence the formula of the solid is `AB_3C`.
Discussion
2704.

The vapour pressure of two pure liquids (A) and (B) are 100 and 80 torr respectively. The total pressure of solution obtained by mixing 2 mole of (A) and 3 mole of (B) would be :-

Answer»

120 TORR
36 torr
88 torr
180 torr

SOLUTION :`P_m=P_A^@X_A + P_B^@X_B`
`=100xx2/5+80xx3/5`
=40+48=88 torr
Discussion
2705.

Which one of the following undergoes halo form reaction?

Answer»

HCHO
`C_6H_5CHO`
`CH_3CHO`
`CH_3 -CH_2 - CH_2OH`

SOLUTION :`CH_3CHO`
Discussion
2706.

underset((A))(C_5H_12)+Cl_2overset(light)rarrunderset((B))(C_5H_11Cl)overset(Na//ether)rarr(C) Only one structure of B is possible (A), (B) and (C) are

Answer»



both are correct
none is correct

Answer :A
Discussion
2707.

Which of the following have same shape as NH_2^+

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`CO_2`
`SnCl_2`
`SO_2`
`BeCl_2`

ANSWER :B::C
Discussion
2708.

Which of the following is semisynthetic polymer ?

Answer»

CELLULOSE
Cellulose NITRATE
PVC
Polythene

SOLUTION :Cellulose nitrate
Discussion
2709.

Which of the following compound will not undergo azo coupling reaction with benzenediazonium chloride

Answer»

Aniline
Phenol
Anisole
Nitrobenzene

Solution :Diazonium CATION being a WEAK electrophile, does not REACT with compounds CONTAINING electron-withdrawing groups such as`NO_2`
Discussion
2710.

Three stereoisomers of CH_(2)YZ are possible if thestructure of methane be-

Answer»

reactangular planar
square planar
square pyramidal
octahedral

Answer :A::B
Discussion
2711.

Which of the following compounds show optical isomerism?

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`[Cu(NH_(3))_(4)]^(2+)`
`[ZnCl_(4)]^(2-)`
`[Cr(C_(2)O_(4))_(3)]^(3-)`
`[Co(CN)_(6)]^(3-)`

Solution :See HINT to Q. 26.
Discussion
2712.

Which of the following has ester linkage?

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NYLON
BAKELITE
TERYLENE
PVC

SOLUTION :Terylene is a POLYESTER.
Discussion
2713.

Which of the following reactions can result in formation of a colloidal solution?

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Reduction of `SO_(2)(g)` with `H_(2)S` to give sulphur and water.
Reduction of `AuCl_(3)` with HCHO in presence of water.
Hydrolysis of `FeCl_(3)` in presence of NaOH.
Hydrolysis of ester in presence of acid.

Answer :A::B::C
Discussion
2714.

Which of the following fails to answer the iodoform test

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Pentanone-1
Pentanone-2
Propanone-2
Ethanol

Solution :1-pentanone is an IMPOSSIBLE compound does not have `CH_(3)-OVERSET(O)overset(||)(C )-` group.
Discussion
2715.

Which one of the following is responsible for maintaining blood sugar level in human body?

Answer»

Riboflavin
INSULIN
Fats
Hormones

SOLUTION : Insulin.
Discussion
2716.

The salewhichis least likely to be foundin minerals is

Answer»

CHLORIDE
SULPHATE
SULPHIDE
NITRATE.

ANSWER :D
Discussion
2717.

Using IUPAC norms, name the complex : [Co(en)_(2)(ONO)Cl]Cl

Answer»

SOLUTION :chloridobis (ethane-1, 2-diamine) NITRITO COBALT (III) CHLORIDE.
Discussion
2718.

Which of the following sequence of reactions (reagents) can be used for conversion of C_(6)H_(5)CH_(2)CH_(3) into C_(6)H_(5)CH=CH_(2)?

Answer»

`SOCl_(2),H_(2)O`
`SO_(2)Cl_(2),alc.KOH`
`Cl_(2)//hv,H_(2)O`
`SOCl_(2),alc.KOH`

Solution :`C_(6)H_(5)CH_(2)CH_(3) underset(-SO_(2),-HCL)overset(SO_(2)C l_(2))to C_(6)H_(5)-CHCl-CH_(3) underset(-HCl)overset("alc. KOH")to C_(6)H_(5)CH=CH_(2)`
Discussion
2719.

Whichof the following is best concentrated by frothfloatintion method ?

Answer»

Cassiterite
Galena
Malachite
Magnetite

Answer :B
Discussion
2720.

Which electronic configuration of neutral atoms will have the highest first ionisation potential

Answer»

`1s^2 2s^2 2p^4`
`1s^2 2s^2 2p^3`
`1s^2 2s^2 2p^2`
`1s^2 2s^2 2p^1`

ANSWER :B
Discussion
2721.

The type of isomerism present in Pentamminenitrochromium (IU) chloride is

Answer»

optical
linkage isomers
ionisation
polymerisation

Solution :The CHEMICAL formula of Pentammine nitrochromium (III) CHLORIDE is
`[Cr(NH_(3))_(5)NO_(2)]Cl_(2)`
It can exist in following two structures.
`[Cr(NH_(3))_(5)NO_(2)]Cl_(2)`
It can exist in following two strucrtures
`[Cr(NH_(3))_(5)NO_(2)]Cl_(2) and [Cr(NH_(3))_(5)ONO]Cl_(2)`
Therefore the type of isomersm found in this compound is linkage isomerism as nitro group in linked through N as `-NO_(2)` or through O as -ONO.
Discussion
2722.

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

Answer»

Solution :The ROLE of cryolite is to make ALUMINA a good conductor of electricity and to lowerthe fusion (melting point) temperature of the BATH from 2323 K to about 1140K.
Discussion
2723.

Which is not easily precipitated from aqueous solution?

Answer»

`CO_(3)^(2-)`
`SO_(4)^(2-)`
`NO_(3)^(-)`
`CI^(-)`

Answer :C
Discussion
2724.

Write the chemical reaction equations with one example of the Coupling reaction.

Answer»

SOLUTION :
Discussion
2725.

The total energy of the organic molecule (leaving aside the nuclear energy) may be taken as :

Answer»

Electronic
Vibrational
Rotational
All

Answer :D
Discussion
2726.

Which of the following compounds is more reactivity in SN^(1) reaction

Answer»

t-butyl iodide
Vinyl iodide
Benzy iodide
Allyl iodide

Solution :Compound which produced more stable CARBOCATION is more REACTIVE for `SN^(1)` REACTION. Benzyl carbocation is more stable than other.
Discussion
2727.

What is the potential of a half-cell consisting of zinc electrode in 0.01m ZnSO_(4) solution at 258^(@)C(E^(@)=0.763V)

Answer»

0.8221 V
8.221 V
0.5282 V
9.232 V

Answer :A
Discussion
2728.

Which of the followingreaction cannot be a base forelectrochemical cell

Answer»

`H_(2)+O_(2)rarrH_(2)O`
`AgNO_(3)+ZnrarrZn(NO_(3)_(2)+Ag`
`AgNO_(3)+NacIrarrAgCI+NaNO_(2)`
`KMnO_(4)+FeSIO_(4)+H_(2)SO_(4)rarrK_(2)SO_(4)+Fe_(2)(SO_(45)_(3)+MnSO_(4)+H_(2)O`

Solution :Electrochemical cell are based upon the reaction between variouselectrolytes the reactiongiven in optiondoesnot INVOLVE electroltes so it cannot be a base for electrochemical cell
Discussion
2729.

The most reactive hydrocarbon is

Answer»

ETHANE
Ethyne
Ethene
Methane

Solution :ALKYNE GT ALKENE gt ALKANE
Discussion
2730.

Which of the following is expected to be a paramagnetic complex?

Answer»

`[NI(H_2O)_6]^(2+)`
`[Ni(CO)_4]`
`[Zn(NH_3)_4]^(2+)`
`[Co(NH_3)_6]^(3+)`

ANSWER :A
Discussion
2731.

Why are (o + p) in ratious for the SE reaction (e.g. nitraction) of toluene and PhCF, 32.3 and 0.14, respectively ?

Answer»

Solution :In TOULENE, `(-CH_(3))` group is the activating group (due to three `H.C`. Sturctures). Also, it is `sigma-` and `p` directing so `(( o + p))/(m)` ratio is very high.
In PhCF_(3), (-CF_(3))` is the decavating group to `-1` effect of three `F` atoms on the `ALKYL C` ATOM. Thus, reactivity on all the ring decreases , but to lesser extent at `m-C`. Therefore, `(-CF_(3))` group is `m`-director. Consequently, (o + p)//m` ratio is very low.
Discussion
2732.

Which of the following statements regarding molecularity is wrong ?

Answer»

it is the number of REACTANT MOLECULES colliding in a single STEP of chemical reaction.
it REFERS to individual step of the reaction.
it may be whole number or fractional
the rate of reaction is independent of molecularity.

Answer :C
Discussion
2733.

What mass of H_(2)SO_(4) could be produced (in kg) in the process given below if 5.52 kg of FeS, is used FeS_(2)(s)+O_(2)(g)toFe_(2)O_(3)(s)+SO_(2)(g) SO_(2) (g)+O_(2)(g)toSO_(4)(I)toH_(2)SO_(4)(aq)(At. wt. of Fe = 56, S = 32)

Answer»

Solution :`FeCl+XAgNO_(3)toxAGCI + Fe(NO_(3))_(2)`
`(56 +35.5x)_(5)``(143.5xxg)`
`(Wt.of FeCI_(X))/(Wt.of AgCI)=(MOL. Wt of FeCI_(5))/(Mol wt. Og AgCI(XUNIT))``rArrr``(134.8)/(304.8)=(56+35.5x)/(143.5x)`
Discussion
2734.

Which of the followinf gives dence fumes of P_(4)O_(10)

Answer»

`PCl_(5)`
`PCl_(3)`
WHITE phosphorous
Red phosphorous

Answer :C
Discussion
2735.

Which of the follwing alcohols is made by fermentation:

Answer»

Methanol
Ethanol
Glycerol
Propanol

Answer :B
Discussion
2736.

Which of the following compounds gives blood red colouration when its Lassaigne's extract is treated with alkali and ferric chloride .

Answer»

Thiourea
Diphenyl sulphide
Phenyl hydrazine
Benzamide

Solution :Thiourea CONTAINS both S and N and HENCE gives blood redcolouration when its LASSAIGNE's extract with alkali and `FeCl_(3)`.
`3NaCNS +FeCl_(3)rarrunderset(("Blood red"))underset("Ferric sulphocyanide")(FE(CNS)_(3)+3NaCl)`.
Discussion
2737.

Which allylic carbocation is the most stable carbocation ?

Answer»




All of the above

Answer :C
Discussion
2738.

Which of the following does not belong to group 13 ?

Answer»

B
Al
Ge
In

Answer :C
Discussion
2739.

Write the IUPAC name of

Answer»

SOLUTION :4-nitro PROPIOPHENONE
Discussion
2740.

Which of the following orbitals does not make sense?

Answer»

6S and 5d
3p
2d
4f

Answer :C
Discussion
2741.

Zinc is a constituent of

Answer»

Enzymes
Insulin
Tissues
All are correct

Answer :D
Discussion
2742.

Which of the following aqueous soutioins would have the highest b.p (alpha=100%)

Answer»

`0.1m NaCl`
`0.1M Na_(2)SO_(4)`
`0.1` UREA
0.1m Glucose

Answer :B
Discussion
2743.

What happens when KCl is added to ferric hydroxide sol ?

Answer»

Solution :The ferric HYDROXIDE sol is positively charged. When KCl is added to it, the particles adsorb `CL^(-)`IONS carrying OPPOSITE CHARGE. Their charge gets neutralised and they readily get coagulated.
Discussion
2744.

Which of the following is vitamin ?

Answer»

INSULIN
Ascorbic acid
ESTRONE
Alanine.

Solution :Ascorbic acid is VITAMIN C.
Discussion
2745.

Which of the following is non-planar with respect to central atom ?

Answer»

<P>`[Pd_(2){P(C_(6)H_(5))_(3)}_(2)Cl_(4)]`
`[Ni(CN)_(4)]^(2-)`
`[PtCl_(4)]^(2-)`
`[NiCl_(4)]^(2-)`

SOLUTION :`[NiCl_(4)]^(2-) to TETRAHEDRAL`
Discussion
2746.

Which of these will exhibit geometrical isomerism ?

Answer»

I
II
III
All of these

Answer :B
Discussion
2747.

What is EAN rule ? Give an example.

Answer»

SOLUTION :Every central metal atom or ION in a COMPLEX has a TENDENCY to gain effective atomic number (EAN) of NEXT inert gas. EAN of metal in a complex =Atomic No `~` Oxidation state `+` 2xCoordination number. Example : EAN of Fe in `K_4[Fe(CN)_6=(26-2)+2xx6=36`.
Discussion
2748.

Which of the following properties among halogens decreases from fluorine to iodine ?

Answer»

Electronegativity
Bond energy
Ionisation energy
Electron affinity

Answer :A::C
Discussion
2749.

Which cannot undergo E2 reaction?

Answer»




NONE of these

ANSWER :C
Discussion
2750.

Which of the following reaction are wrong?

Answer»

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SOLUTION : a. ` PhNH_2`
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Discussion