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22351.

Which of the following statement about the electron is incorrect?

Answer»

It is a negatively CHARGED particle
The mass of ELECRON is equal to the mass of neutron.
It is a basic CONSITITUENT of all atoms
It is a CONSTITUENT of cathode rays.

Answer :B
Discussion
22352.

Which one of the following has the highest electron affinity?

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
`I_(2)`

Solution :On moving down the group, electron affinity must decrease, because of the INCREASE in the size of the atom. However, fluorine has lower electron affinity than chlorine. A low value of electron affinity for fluorine is due to the small size of F atom. In a compact 2 p-orbitals of F, the ADDED electron does Ano not feel MUCH attraction, because of inter- electronic REPULSION between the electrons already PRESENT in small compact 2p-subshell of F atom,
Discussion
22353.

Which of the sulphides of group II is blackor brownishblack?

Answer»

PbS
HgS
`Bi_(2)S_(3)`
`CDS or As_(2)S_(3)`

ANSWER :d
Discussion
22354.

Which of these artificial sweetener is unstable at cooking temperature ?

Answer»

Aspartame
Alitame
Sucralose
Saccharin 

ANSWER :A
Discussion
22355.

Zone refining process.

Answer»

SOLUTION :
Discussion
22356.

What is demulsification ? Name two demulsifiers.

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SOLUTION :The PROCESS of separtation of the consituent LIQUIDS of an emulsion is called demulsification. Demulsification can be DONE by centrifuging or boiling.
Discussion
22357.

Which one is a bacterial disease ?

Answer»

AMOEBIC dysentery
Gonorrhea
Cholera
Mumps

Answer :C
Discussion
22358.

What are the different types of isomerism in coordination compounds ?

Answer»

SOLUTION :
Discussion
22359.

Which of the following polymer is obtained by condensation polymerization reaction ?

Answer»

TEFLON
Rubber
Styrene
Nylon-6,6

SOLUTION :Nylon-6,6
Discussion
22360.

Which one of the following is the unit of rate of reaction ?

Answer»

`s^(-1)`
MOL `s^(-1)`
mol `L^(-1)s^(-1)`
`MO^(-1)l L^(-1)s^(-1)`

ANSWER :C
Discussion
22361.

Which one fo the following demonstrates a decreases in entropy?

Answer»

DISSOLVING a solid into solution
An expanding universe
Burning a log in a fireplace
RAKING up leaves into a trash bag

Solution :Raking up leaves into a thrash bag results in decreasein RANDOMNESS i.e.decrease in ENTROPY.
Discussion
22362.

What ppt (B) + NH_(3) rarr Black ppt . (H). Hence, (H) is due to the formula of

Answer»

`HG(NH_(2))CI`
`Hg`
`Hg(NH_(2))CI + Hg`
`Hg(NH_(2))`

Answer :C
Discussion
22363.

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O

Answer»

`Al lt Ca lt O lt C lt F`
`Al lt O lt C lt Ca lt F`
`C lt F lt O lt Al lt Ca`
`Ca lt Al lt C lt O lt F`

ANSWER :D
Discussion
22364.

Which of the following statement is not true about enzyme inhibitors?

Answer»

INHIBIT the catalytic ACTIVITY of the ENZYME.
Prevent the binding of substrate
Generally a strong COVALENT bond is formed between an inhibioue and enzyme
Inhibitors can be competitive or non-competitive

Answer :C
Discussion
22365.

ZnS is:

Answer»

IONIC crystal
Covalent crystal
Metallic crystal
van DER WAALS crystal

Answer :A
Discussion
22366.

What are the uses of aliphatic nitro compounds.

Answer»

Solution :(i) Nitromethane is used as a FUEL for cars.
(ii) Chloropicrin `("CC"l_(3)NO_(2))` is used as an insecticide
(III) Nitroethane is used as a fuel additive and PRECURSOR to EXPLOSIVE and they are good solvents for polymers, cellulose ester, synthetic rubber and dyes etc.
Discussion
22367.

Total number of molecules, in which each covalent bond is comprised of effective back bond. BF_(3), N(SiH_(3))_(3), PF_(3),, POF_(3), B(OH)_(3), O(SiH_(3))_(2), BFH_(2), BF_(2)(NH_(2)), NH(SiH_(3))_(2)

Answer»


Solution :BACK bond FOUND in each covalent bond in `toBF_(3), PF_(3), POF_(3)`
Discussion
22368.

The "saponification value" of an oil or fat is measured in term of

Answer»

`NH_(4)OH`
`NAOH`
KOH
`C_(6)H_(5)OH`

Solution :Saponifiction value is the number of milligrams of KOH REQUIRED to NEUTRALISE the FATTY acid resulting from the COMPLETE hydrolysis of 1 g of oil or fat.
Discussion
22369.

Which of the following is converted into an alcohol on treatment with HNO_(2)

Answer»

Ethyl amine
Aniline
Dimethyl amine
Triethyl amine

SOLUTION :Primary amines give alcohol when react with nitrous acid but METHYL amine is an exception
`CH_(3)NH_(2)+2HNO_(2)rarrCH_(3)-O-N=O+N_(2)+2H_(2)O`
or
`2CH_(3)NH_(2)+2HNO_(2)rarrCH_(3)OCH_(3)+2N_(2)+3H_(2)O`
`CH_(3)CH_(2)NH_(2)+HNO_(2)rarrCH_(3)CH_(2)OH+N_(2)+H_(2)O`
Discussion
22370.

X+RMgX rarr Y overset(H_(2)O.H^(+))rarr Z . If Z is n-butyl alcohol, 'X' is

Answer»

HCHO
`CH_(3)CHO`
RCHO
RCOR

Answer :A
Discussion
22371.

Two liquids A and B have vapour pressure in the ratio P_(A)^(0):P_(B)^(0)=1:3 at a certain temperature . Assume A and B from an ideal solution and the ratio of mole fraction of A to B in the vapour phase is 4:3 . Then the mole fraction of B in the solution at the same temperature is :

Answer»

`1//5`
`2//3`
`4//5`
`1//4`

ANSWER :A
Discussion
22372.

What is the unit of rate constant of the first order reaction?

Answer»

Solution :UNIT of first order REACTION is `sec^(-1)`
Discussion
22373.

Which kind of isomerism is exhibited by octahedral [Co(NH_(3))_(4)Br_(2)]Cl ?

Answer»

GEOMETRICAL and IONIZATION
Geometrical and OPTICAL
Optical and ionization
Geometrical only

ANSWER :A
Discussion
22374.

When propyne is treated with aqueous H_2SO_4 in presence of HgSO_4, the major product is

Answer»

Propanal
propyl hydrogen sulphate
ACETONE
Propanol

Solution :`underset"PROPYNE"(CH_3-C-=CH+H_2O)underset(H_2SO_4)OVERSET(1%HgSO_4)to CH_3-undersetunderset(OH)(|)C=CH_2hArr underset"acetone"(CH_3-undersetunderset(O)(||)C-CH_3`
Discussion
22375.

The wt. in g of 1 curie of radioactive element ""^(200)X having a t_(1//2) of 63.3 is

Answer»

`3.7 xx 10^(-8)` G
`200 g`
`7.4 xx 10^(-8) g`
`3.0 xx 10^(-8) g`

Solution :`lambda = (0.693)/(t_(1//2)) = (0.693)/(69.3) "MIN"^(-1) = 10^(-2) "min"^(-1)`
1 Curie = `3.7 xx 10^(10) DS^(-1) = 3.7 xx 10^(10) xx 60 d "min"^(-1)`
`= 2.22 xx 10^(12) d "min"^(-1) = lambda N = 10^(-2) N`
or `N = 2.22 xx 10^(14)` atoms.
`=(200)/(6.023 xx 10^(23)) xx 2.22 xx 10^(14) = 7.4 xx 10^(-8) g`.
Discussion
22376.

What are zeolites ? What is their utility ?

Answer»

Solution :The catalytic reaction that DEPENDS upon the pore structure of the catalyst and the size of the reactants and PRODUCTS is called shape-selective catalysis. Zeolites are good shape-selective catalysts because of their honeycomb-like structures. They are microporous aluminousilicateswith three dimensional networks of silicates in which some SILICON atoms are REPLACED by aluminium atoms giving Al-O-Si framework. The reactions taking place in zeolites depend upon the size and shape of reactants and products as well as upon the PORES and cavities of the zeolites.
Utility : Zeolites are widely used as catalysts in petrochemical industries for cracking and isomerisation of hydrocarbons. An important zeolite catalyst used in petrochemical industry is ZSM-5. It converts alcohols directly into gasoline (petrol) by dehydrating them to give a mixture of hydrocarbons.
Discussion
22377.

Which is more stable? Fe^(3+) or Fe^(2+) - explain.

Answer»

Solution :Fe (Z -26) `Fe to Fe^(2+) + 2e^(-)`
`Fe to Fe^(3+) + 3e^(-)`
`Fe^(2+)` [Number of ELECTRONS 24)
Electronic configuration = [Ar]`3d^(6)`
`Fe^(3+)` [Number of electrons 23)
Electronic configuration = [Ar]`3d^(5)`
Among `Fe^(3+)` and`Fe^(2+), Fe^(3+)` is more stable due to half filled d-orbital. This can be explained by AUFBAU principle. Half filled and completely filled d-orbitals are more stable than PARTIALLY filled d-orbitals. So `Fe^(3+)` is more stable than`Fe^(2+)`.
Discussion
22378.

The specific reaction rate of a first order reaction is independent of the

Answer»

CONCENTRATION of the reactants
time
temperature
activation energy

Answer :A::B
Discussion
22379.

Which of the following is a disaccharide?

Answer»

Glucose
Ribolose
Lactose
ARABINOSE

Solution :lactose is a DISACCHARIDE. Its formula is `C_12H_22O_11`. On HYDROLYSIS it GIVES glucose and GALACTOSE.
Discussion
22380.

What dowe call the proteins where the polypeptidechainsare heldtogetherby hydrogenand disulphide bonds?

Answer»

SOLUTION :FIBROUS
Discussion
22381.

Which of the following statements is false? (i) A D enantiomers rotates the plane of polarized light to the right and an L enantiomer to the left (ii) Conversion of an erythro to a threo stereoisomer always occurs by inversion at one chiral C. (iii) A racemate can be distinguished from a maso or an achiral compound by an attempted resolution (iv) Racemizatio of an enantiomer can only occur by breacking of a least one bond to the chiral center (v) A reaction catalyzed by an enzyme always gives an optically active product.

Answer»

(i),(ii),(iii),(iv),(v)
(i),(iii),(v)
(i),(v)
(ii),(iii),(iv)

SOLUTION :(i) is false because the terms `D` and `L` do not REFER to the sign of ROTATION. They refer to the configuration of a stereoisomer relative to that of `D`(or`L`)-glyceraldehyde. Moreover `D` and `L` steroisomers are not necessarily enantiomers. The statement that `D` and `L` steroismers are enantiomers is ture only for a compound with one chiral carbon.

Consider the conversion of the `D` compound above to the `L` compound, a different diasteromer i9s formed.
(ii) is true because changing the configuration at one of the chiral carbon atoms converts one diastereomer to the other
(iii) is true because UNLIKE a racemate, meso and chiral compounds cannot be resolved as they do not consist of enantiomers.
(iv) is true because only by breaking a bond configuration is changed
(v) is false because the product could be meso or chiral
Discussion
22382.

Which category of salts of alkaline earth metals is not found in solid state, but found in solution state ?

Answer»

Carbohydrates
Bicarbonates
Hydroxides
Sulphates

Answer :B
Discussion
22383.

Which is maximum hydrated ?

Answer»

NaCl
`MgCl_(2)`
`AlCl_(3)`
`SiCl_(4)`

ANSWER :D
Discussion
22384.

What happens when ethyl nitrite is boiled with NaOH ?

Answer»

SOLUTION :`C_2H_5-O-NO + NAOH- RARR C_2H_5OH + NaNO_2`
Discussion
22385.

Which of the following is L-fructose?

Answer»




ANSWER :D
Discussion
22386.

Write the structure formulae and IUPAC names for all the isomeric aldehydes and ketones of molecular formula, C_5H_(10)O.

Answer»

Solution :With the formula `C_(5)H_(10)O`, four aldehydes and three ketones are possible.
Possible aldehydes are :
(i) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-CHO` Pentanal
(ii) `CH_(3)-CH_(2)-CH(CH_(3))CHO` 2-Methylbutanal
(iii) `(CH_(3))_(2)CHCH_(2)CHO` 3-Methylbutanal
(iv) `(CH_(3))_(3)C CHO` 2,2-Dimethylpropanal
Possible ketones are :
(i) `CH_(3)-CH_(2)-CH_(2)-CO-CH_(3)` PENTANONE -2
(ii) `CH_(3)-CH_(2)-CO-CH_(2)-CH_(3)` Pentanone-3
(iii) `(CH_(3))_(3)CHCOCH_(3)` 3-Methylbutanone
Discussion
22387.

Which one is a phospholipid :

Answer»

Lecithin
Cephalin
Kephalin
All

Answer :D
Discussion
22388.

When liberates H_(2) with dil H_(2)SO_(4)?

Answer»

Zn
Cu
Fe
S

Answer :C
Discussion
22389.

What is (Z) ?

Answer»

It is salt of `Fe^(3+)`
It is salt of `Sn^(4+)`
It is salt of `Mn^(2+)`
It is salt of `Cr^(6+)`

Solution :`2MnO_4^(-)(Y)+3MN^(2+)(Z)+2H_2Oto5MnO_2+4H^(+)`
This reaction is Vohhard method for estimation of manganese carried out in presence of `ZnSO_4` or suspended ZnO which CATALYSE the oxidation.
Discussion
22390.

Which one'of the following is the configu- ration standard for giving D, L-configuration of sugars?

Answer»

Erythrose
Arabinose
Glyceraldehyde
Glucose

Answer :C
Discussion
22391.

Which liberates H_(2) with HNO_(3)?

Answer»

Zn
Al
Cu
Mg

Answer :D
Discussion
22392.

Which of the elements show allotropy ?

Answer»

B
P
As
Bi

Answer :B::C
Discussion
22393.

Which set of elements has the strong tendency to form anions?

Answer»

N, O, F
P, S, Cl
As, SE, Br
Sb, TE, I

Answer :A
Discussion
22394.

Write the chemical equation for Williamson synthesis of 2-ethoxy -2- methyl pentane starting from ethanol and 2-methyl pentan-2-ol.

Answer»

Solution :Williamson synthesis :
Step 1 : `underset("Ethanol")(CH_3CH_2OH) underset((or) PBr_3)overset(HBr//Delta)(rarr) underset("Ethyl bromide")(CH_3-CH_2-Br) + H_2O`
Step 2 : `underset(2-"methyl-pentan-2-ol")underset(CH_3)underset(|)overset(OH)overset(|)(C )-CH_2-CH_2-CH_3 overset(Na-"metal")(rarr) 2CH_3-underset("Sodium alkoxide")underset(CH_3)underset(|) overset(ONA)overset(|)(C )-CH_2-CH_2-CH_3 + H_2 uarr`
Step 3 :
Williamsons synthesis occurs by `SN^2`- MECHANISM and primary alkyl halides are more reactive in `SN^(2)` REACTIONS. Therefore ethanol is converted into ethyl bromide.
Discussion
22395.

What do you mean by Peptide linkage ?

Answer»

SOLUTION :The linkage `-overset(O)overset(||)C-overset(H)overset(|)N-` present in peptides and PROTEINS is called PEPTIDE linkage.
Discussion
22396.

The s-block element present in zero group is

Answer»

HYDROGEN
HELIUM
Neon
Radon

ANSWER :B
Discussion
22397.

When ammonia is added to cupric salt solution, the deep blue colour is observed it is due to the formation of:

Answer»

`[CU(OH)_(4)]^(2-)`
`[Cu(NH_(3))_(4)]^(2+)`
`[Cu(H_(2)O)_(2)(NH_(3))_(2)]^(2+)`
`[Cu(H_(2)O)_(4)]^(2-)`

ANSWER :B
Discussion
22398.

Which of the following lattices has the highest packing efficiency (i) simple cubic (ii) body-centred cubic and (iii) hexagonal close-packed lattice ?

Answer»

SOLUTION :Hexagonal close-packed lattice (PACKING EFFICIENCY =74%).
Discussion
22399.

The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the moststable comolex species ?

Answer»

`[FE(CO)_(5)]`
`[Fe(CN)_(6)]^(3-)`
`[Fe(C_(2)O_(4))_(3)]^(3-)`
`[Fe(H_(2)O)_(6)]^(3+)`

Solution :(c)
Discussion
22400.

Which of following is non-aromatic ?

Answer»




SOLUTION :
Discussion