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20251.

The solubility product of As_(2)S_(3) is 2.8 xx 10^(-72). What is the solubility of As_(2)S_(3)

Answer»

`1.09 xx 10^(-15)` mole/litre
`1.72 xx 10^(-15)` mole/litre
`2.3 xx 10^(-16)` mole/litre
`1.65 xx 10^(-36)` mole/litre

Solution :`K_(sp) = [As^(3+)][S^(2-)]`,
`S = 5sqrt((K_(sp))/(108)) = 5sqrt((2.8 xx 10^(-72))/(108)) = 1.09 xx 10^(-15)`
Discussion
20252.

Which of the statements about "Denaturation" given below are correct ? (i) Denaturation of proteins causes loss of secondary and tertiary structures of the protein. (ii) Denaturation leads to the conversion of double strand of DNA into single strand (iii) Denaturation affects primary strucrture which gets distorted

Answer»

(ii) and (iii)
(i) and (iii)
(i) and (ii)
(i),(ii) and (iii)

Solution :When the PROTEINS are subjected to the action of heat, mineral acids or ALKALI, the water soluble form of globular PROTEIN changes to water insoluble fibrous protein. This is called denaturation of proteins. During denaturation secondary and tertiary structures of protein destroyed but primary structures remains intact.
Discussion
20253.

Which of the following characteristic is not correct for physical adsorption?

Answer»

ADSORPTION INCREASES with increase in temperature
Adsorption is spontaneous
Both enthalpy and ENTROPY of adsorption are negative
Adsorption on SOLIDS is reversible

Solution :N//A
Discussion
20254.

Which one of the following exhibits geometrical isomerism

Answer»

1,2-dibromopropene
2,3-dimethylbut-2-ene
2,3-dibromobut-2-ene
2-methylbut-2-ene

SOLUTION :
Discussion
20255.

To detect reducing and non reducing sugar following test is used

Answer»

MILLION test
Biuret test
Tollen's test
Xanthoproteic test

Answer :C
Discussion
20256.

The vapour pressure of benzene is 53.3 k P_(a) at 60.6^(@) but it falls to 51.5 kP_(a) when 19 g of a non-volatile organic compound is dissolved in 500 g benzene . The molar mass of the non-volatile compound is close to :

Answer»

82
85
88
92

Answer :B
Discussion
20257.

Which of the following is not correct statements with respect to carbohydrates ?

Answer»

All carbohydrates are OPTICALLY ACTIVE
Carbohydrates are called saccharides.
All carbohydrates have aldehyde as a principal functional group.
Carbohydrates are primarily produced from plants.

Solution :All carbohydrates have aldehyde as a principal functional group.
Carbohydrates have EITHER aldehyde of KETONE as a principal functional group.
Discussion
20258.

What is sorption ?

Answer»

SOLUTION :The PHENOMENON which cann.t be TERMED as ADSORPTION or adsorption is termed as SORPTION.
Discussion
20259.

When glucose reacts with bromine water, the main productis

Answer»

GLUCONIC acid
glyceraldehyde
saccharic acid
acetic acid

Solution :Glucose CONTAINS an aldehyde group. It is oxidised into ACIDIC group by bromine Water and gluconic acid is FORMED
`CH_2OH-(CHOH)_4 -CHO overset"(O)"to CH_2OH-(CHOH)_4 -COOH`
`Br_2 + H_2O to 2HBr + O `
Discussion
20260.

Which cannot be prepared by Kolbe's electrolytic reaction using single salt?

Answer»

`CH_4`
`C_2H_6`
`C_4H_10`
`H_2`

ANSWER :C
Discussion
20261.

Which of the followingis useed for inducing sleep ?

Answer»

Paracetamol
Chloroquine
Bithional
Barbituric ACID deribvatives

ANSWER :D
Discussion
20262.

Which one of the following is used as glass reinforcing material in safety helmets?

Answer»

nylon
bakelite
TERYLENE
orlon

Solution :terylene
Discussion
20263.

Write the half reactions and number of moles of electrons involved in the overallcell reaction for the electrochemical cell designated byPt|Ag(s)|AgCl(s)|CI^(-)(c = 1)|Cl_2(c = 1)//C(graphite)|Pt.

Answer»

SOLUTION :`Ag(s) + CL^(-) (AQ) to AgCl(s) + E`
`Cl_2 + 2e to 2Cl^(-)`
n = 2
Discussion
20264.

Which one of the following is not a common component of photo-chemical smog?

Answer»

Ozone
Acrolein
Peroxy acetyl nitrate
Chloro flouro carbons

Solution :PHOTOCHEMICAL SMOG is a mixture of air pollutants which have been chemically altered into further noxious compounds by exposure to sunlight the MAIN components of photochemical `LT s`are ozone, peroxy acetyl nitrate (PAN), nitrogen oxides, voltaltile organic compounds etc.
Discussion
20265.

Which protein is main constituent of milk

Answer»

Keratin
Casein
Myosin
Insulin

Answer :B
Discussion
20266.

Writethe Z witter ion structureof alanine.

Answer»

SOLUTION :Z witterion STRUCTURE of ALANINE :
`H_(3)OVERSET(o+)(N) - UNDERSET(CH_(3)) underset(|)(CH) - CO O^(ө)`
Discussion
20267.

The standard heats of formation for C Cl_(4(g)), H_2O_((g)), CO_(2(g)) "and" HCl_((g)) "are" -25.5, -57.8, -94.1"and" -22.1 kcal respectively. DeltaH for the reaction, C Cl_(4(g))+2H_2O_((g)) to CO_(2(g)) + 4HCl_((g))at 298 K is__________.

Answer»

`-199.5`KCAL
`-265.8`kcal
`-32.9`kcal
`-41.4`kcal

Answer :D
Discussion
20268.

Which of the following are paramagnetic

Answer»

`[NiCl_(4)]^(2-)`
`[Ni(NH_(3))_(4)]^(2+)`
`[MnCl_(4)]^(2-)`
`[CuCl_(4)]^(2-)`

Solution :The number of unpaired electrons in these complexes are respectively.
`{:([NiCl_(4)]^(2-),""2),([Ni(CN)_(4)],""0),([MnCl_(4)]^(2-),""5),([CuCl_(4)]^(2-),""1):}`
`CN^(-)` a string field LIGAND and `CL^(-)`is a weak field ligand. So only in `[Ni(CN)_(4)]^(2-)` electronic regrouping occurs.
Discussion
20269.

Which is most acidic

Answer»




ANSWER :D
Discussion
20270.

Which one of the following is a meso-compound?

Answer»

SOLUTION :COMPOUND 2
Discussion
20271.

Which of the following cations will turn a borax bead green in an oxidising flame?

Answer»

`Fe^(2+)`
`MN^(2+)`
`Cr^(3+)`
`CU^(2+)`

SOLUTION :`Fe^(+2), Cr^(+3)` colours CHANGED as per cold and hot conditions
Discussion
20272.

Which of the following is the strongest lewis acid?

Answer»

`BI_3`
`BBr_3`
`BCl_3`
`BF_3`

Solution :Larger the SIZE of the halogen atom less is the back donation of ELECTRONS into empty 2P ORBITAL of B.
Discussion
20273.

Out of H_(2)O which one has higher bond angle and why?

Answer»

Solution :`H_2O` has the larger angle `(104.5^@)` than `H_2S (93^@)` because of the smaller size and HIGHER electronegativity of OXYGEN DUE to which the bond pairs are closer and hence, there will be greater bond pair-bond pair repulsion in `H_2O`than in `H_2S`.
Discussion
20274.

Which of the following is paramagnetic as well as coloured ion ?

Answer»

`Cu^(+)`
`Cu^(2+)`
`SC^(3+)`
`ZN^(2+)`

Answer :B
Discussion
20275.

Which of the following is not a classification of proteins

Answer»

Enzymes
Antibodies
ANTIGENS
Hormones

Solution :Antigens are POLYSACCHARIDES PRESENT on RBC's surface.
Discussion
20276.

Which type of metal can be used in cathodic protection of iron against rusting?

Answer»

SOLUTION :A metal which is more ELECTROPOSITIVE than IRON such as AL, Zn, MG.
Discussion
20277.

Which of the following cannot reduce Fehling solution?

Answer»

`HCOOH`
`HCHO`
``CH_3CHO`
`CH_3COOH`

ANSWER :D
Discussion
20278.

The screening effect of 'd' electrone is :

Answer»

<P>MUCH LESS than s-electrons
Much more than s-electron
Equal to s- electrons
Equal to p electrons

Answer :A
Discussion
20279.

The slowest of abstraction of hydrogen atoms by a chlorine atoms is shown by

Answer»

`(CH_(3))_(3)-C-CH_(3)`
`(CH_(3))_(3)CH`
`C_(6)H_(5)CH_(3)`
`CH_(2)=CHCH_(3)`

SOLUTION :`(CH_(3))_(3)C-CH_(3) overset(-H^(@))to underset("LEAST stable")((CH_(3))3C-CH_(2))`
Discussion
20280.

Which represents disproportionation :

Answer»

`2Cu^+ rarrCu^(2+) + CU`
`3I_2 rarr5I +I^(5+)`
`H_2O+ CI_2 rarrCI^- +CIO^- +2H^+`
All of these

ANSWER :D
Discussion
20281.

Write the cell reactions for the following cells. (i) Zn|ZnO_(2)^(2-), OH^(-)|HgO|Hg (ii) Pb|PbSO_(4)|H_(2)SO_(4)|PbSO_(4)|PbO_(2)|Pt (iii) Pt|H_(2)|HCl|Hg_(2)Cl_(2)|Hg|Pt

Answer»

SOLUTION :(i) The ELECTRODE reactions are
`Zn_((s))+4OH^(-)+2e^(-)rarr ZnO_(2)^(2-)+2H_(2)O`
`HgO_((s))+H_(2)O+2e^(-)rarr Hg_((s))+2OH^(-)`
Cell reaction is
`Zn_((s))+HgO_((s))+2OH^(-)rarr ZnO_(2)^(2-)+Hg_((s))+H_(2)O`
(ii) The electrode reactions are
`Pb_((s))+SO_(4)^(2-)rarr PbSO_(4(s))+2e^(-)`
`PbO_(2(s))+SO_(4)^(2-)+4H^(+)+2e^(-)rarr PbSO_(4(s))+2H_(2)O`
Cell reaction is
`Pb_((s))+PbO_(2(s))+4H^(+)+2SO_(4)^(2-)rarr 2PbSO_(4(s))+2H_(2)O`
(iii) The electrode reaction are
`2H^(+)+2e^(-)rarr H_(2(g))`
`Hg_(2)Cl_(2(s))+2e^(-)rarr 2Hg_((l))+2Cl^(-)`
The cell reaction is
`Hg_(2)Cl_(2(s))+H_(2)rarr 2Hg_((l))+2H^(+)+2Cl^(-)`
Discussion
20282.

Which of the following drugs is analgesic drug ?

Answer»

Paracetamol
Penicillin
Ranitidine 
BARBITURATES 

ANSWER :A
Discussion
20283.

Which is the correct increasing order of ionization energy ?

Answer»

`LI LT B lt Be`
`Be lt B lt Li`
`Li lt Na lt K`
`O lt N lt F`

Answer :A::C::D
Discussion
20284.

Tranquilizers are medicines or the chemical substances used for the treatment of stress and mild to severe mental diseases. They induce a sense of fitness and relieve stress anxiety and fatigue tranquilizers are also called psychotherapeutic drugs. They acts on central nervous system. They include hypnotics and sedatives Which of the following is a hallucinogenic drug?

Answer»

LSD
Methedrine
Calmpose
SECONAL

Solution :LSD may CAUSE HALLUCINATIONS.
Discussion
20285.

Tranquilizers are medicines or the chemical substances used for the treatment of stress and mild to severe mental diseases. They induce a sense of fitness and relieve stress anxiety and fatigue tranquilizers are also called psychotherapeutic drugs. They acts on central nervous system. They include hypnotics and sedatives Veronal a barbiturate drug is used as

Answer»

an aesthetic
SEDATIVE
ANTI SEPTIC
none of these

Solution :VERONAL is sedative
Discussion
20286.

Tranquilizers are medicines or the chemical substances used for the treatment of stress and mild to severe mental diseases. They induce a sense of fitness and relieve stress anxiety and fatigue tranquilizers are also called psychotherapeutic drugs. They acts on central nervous system. They include hypnotics and sedatives Which of the following is a hypnotic drug

Answer»

LUMINAL
Saconal
A & B
Butyric acid

Solution :Luminal seconol are HYPNOTICS
Discussion
20287.

whichof thefollowingfieldsinvolvethe useofcoordination compounds ? I. Electroplating II.Medicinalchemistry III.Textiledyeing IV. Metallurfical processes V. Analytical reagents Chosse the correctoption

Answer»

I,II ,III andIV
II,III ,IV, andV
I,IIIand V
I ,II ,III , IV and V

Solution :Eachfieldinvolvesthe USEOF coordinationchemistrylikeelectroplating, medicinalchemistry ,textile dyeingmetallurgical PROCESSES ,analytical REAGENTS.
Discussion
20288.

The xenon compounds that are isostructural withh I"Br"_(2)^(-) and BrO_(3)^(-) respectively are respectively

Answer»

`XeF_(2)` (LINEAR) and `XeO_(3)`(pyramidal)
`XeF_(2)` (bent) and `XeO_(3)` (pyramide)
`XeF_(2)`(bent) and `XeO_(3)` (PLANAR)
`XeF_(2)`(linear) and `XeO_(3)` (tetrahedral)

ANSWER :A
Discussion
20289.

The relative rate of diffusion of a gas ( molar mass = 128 ) as compared to oxygen is :

Answer»

2 times
`1//4` th
`1//8 th`
`1//2`

SOLUTION :`( r ( "GAS"))/(r ( O_(2)))= sqrt( ( 32)/(128)) = ( 1)/( 2)`
Discussion
20290.

The structure of NaCl crystal is :

Answer»

BODY CENTRED CUBIC lattice
Face centred cubic lattice
Octahedral
Square planar

Answer :B
Discussion
20291.

Which of the following is a false statement.

Answer»

The product of the reaction of ETHYL iodide with silver cyanide is ethyl isocyanide
The formation of ether from the reaction of methyl iodide with dry `Ag_(2)`O is called WILLIAMSON’s synthesis
The test of chloroform is possible with HOFMANN carbylamine reaction
Iodoform gives VIOLET vapours on heating

Answer :B
Discussion
20292.

Which of the following is diamagnetic -

Answer»

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

Answer :C
Discussion
20293.

Which of the following are produced from coaltar

Answer»

Synthetic dyes
Drugs
Perfumes
All the three

Solution :Synthetic dyes, drugs , perfumes all are MADE from COAL TAR
Discussion
20294.

When KMnO_4 is added to oxalic acid, the decolourisation is slow in the begining but becomes instantaneous after sometime because

Answer»

`MN^(2+)` ACTS as autocatalyst
`CO_2` is fomed as the products
Reaction is EXOTHERMIC
`MnO_(4)^(-)` catalyses the reaction

Answer :A
Discussion
20295.

The ultimate products of oxidation of most of hydrogen and carbon in food-stuffs are:

Answer»

`H_2O` ALONE
`CO_2` alone
`H_2O` and `CO_2`
NONE of these

Answer :D
Discussion
20296.

Which metals in the first transition series ( 3d series) exhibits +1 oxidation state most frequently and why?

Answer»

Solution :COPPER in the FIRST transition SERIES exhibits `+1` oxidation statemost frequencly . This is because Cu is `3D^(10) 4s^(1)` . When one electron is lost, theconfiguration becomes most stable due to fully filled`d^(10)` configuration.
Discussion
20297.

Which alcohols is used in making printing inks and stamp pad ink?

Answer»

GLYCOL
ETHANOL
GLYCEROL
Phenol

Solution :Glycerol
Discussion
20298.

Towards, nucleophilic substitution chlorobenzene is

Answer»

More REACTIVE than ETHYL chloride 
More reactive than isopropyl chloride 
As reactive as methyl chloride
Less reactive than BENZYL chloride 

Answer :D
Discussion
20299.

Write the monosubstituted compounds formed in each of thefollowing reactions and state whether each reaction is faster or slower than that of benzene. 5 Nitration of C_6H_5COOCH_3

Answer»

SOLUTION :`m-O_2NC_6H_4COOMe` (for this compound SULPHONATION OCCURS faster than BENZENE )
Discussion
20300.

Write the monosubstituted compounds formed in each of thefollowing reactions and state whether each reaction is faster or slower than that of benzene. 6 Sulphonation of C_6H_5CHMe_2

Answer»

SOLUTION :`p-HSO_3C_6H_4CHMe_2` (for THISCOMPOUND sulphonation OCCURS faster than benzene )
Discussion