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9001.

Which of the following combination is INCORRECT option ?

Answer»

`(i) (III) (R )`
`(III) (ii) (Q)`
`(III) (IV) (S)`
`(IV) (ii) (P)`

ANSWER :D
Discussion
9002.

Time required to decompose SO_2Cl_2 to half of its initial amount is 60 minutes. If the decomposition is a first order reaction , calculate the rate constant of the reaction.

Answer»

Solution :For a FIRST order reaction,
`k=(0.693)/(t_(1/2))=(0.693)/(660min)=1.155x10^(-2)"min"^(-1)=(0.693)/(600xx60)=1.925xx10^(4)s^(-1)`
Discussion
9003.

Which of the following pair of species is not iso-structural ?

Answer»

`Icl_(4)^(-),XeF_(4)`
`ClO_(3)^(-), CO_(3)^(2-)`
`Ibr_(2)^(-), XeF_(2)`
`BrO_(3)^(-), XeO_(3)`

Solution :Hybridization in `ClO_(3)^(-) = SP^(3)`
Hybridisation in `CO_(3)^(2-) = SP^(2)`
`therefore` They are not structural ISOMERS.
Discussion
9004.

Which of the following groups contain coloured ionsout of Cu^(2+), Ti^(4+), Co^(2+) and Fe^(2+)?

Answer»

Only `Cu^(2+), TI^(4+)`
`Cu^(2+), Co^(2+), Fe^(2+)`
`Ti^(4+), Co^(2+)`
All of these

Solution :Colour of a compound is property of unpaired d - electrons.
`{:("Ion","Electronic","Unpaired"),(,"configuration","ELECTRON"),(Cu^(2+),3d^(9),1),(Ti^(4+),3d^(0),0),(Co^(2+),3d^(7),3),(Fe^(2+),3d^(6),4):}`
Since `Cu^(2+),Co^(2+) and Fe^(2+)` contains unpaired electrons these are COLOURED ions.
Discussion
9005.

When H_2S is passed through nitric acid solution, the product formed is:

Answer»

MILK of SULPHUR
Colloidal sulphur
`GAMMA`-sulphur
`BETA`-suphur

Answer :B
Discussion
9006.

Which of the following is/are the intensive property?

Answer»

Temperature
VISCOSITY
Density
All of these

Solution :Temperature, viscosity and density all are INTENSIVE property. Those properties which do not depend on the quantity or SIZE of matter PRESENT are known as intensive properties.
Discussion
9007.

Which of the following has a higher value for molar conductivity under similar conditions? "0.1M KCl or 0.01 M KCI".

Answer»

SOLUTION :`"0.01M KCL "`has a higher value for molar CONDUCTIVITY under similar CONDITIONS.
Discussion
9008.

Which of the following has hcp crystal structure ?

Answer»

`NaCl`
`CaCl_(2)`
`Zn`
`RbCl`

ANSWER :C
Discussion
9009.

Which of the following provide chief structural material for tissues

Answer»

myosin
insulin
albumin
pepsin

Answer :A
Discussion
9010.

Which is acid anhydride?

Answer»

BAO
`Na_2O`
`CO_2`
CO

Answer :C
Discussion
9011.

Which of the following tetra atomic species are planar and polar, [I_(2) (CN)]^(+), ICl_(2)^(-), XeF_(2), ICl_(3), BF_(3), C Cl_(4)^(-), BF_(4)^(-), NH_(4)^(+), AlCl_(3), ClF_(3)

Answer»


SOLUTION :
Discussion
9012.

Which of the following will give yellow precipitate with I_2//NaOH ?

Answer»

`CH_3COOCOCH_3`
`CH_3COOCH_2CH_3`
`CH_3CONH_2`
`CH_3CH(OH)CH_2CH_3`

Solution :Acid anhydrides, ESTERS and amides do not give iodoform TEST
`CH_3undersetoverset(|)(OH)(C )H - CH_2 -CH_3 underset(NaOH)OVERSET(I_2) CHI_3 + HO - oversetunderset(||)(O)(C ) - CH_2 - CH_3`
Discussion
9013.

Which of the following is not present in nucleic acids

Answer»

Uracil
2- aminopyridine
Thymine
Adenine

Answer :B
Discussion
9014.

Which of the following reactions can give carboxylic acid?

Answer»

`C_(6)H_(5)OH+NaOH+CO_(2)to`
`C_(6)H_(5)OH+NaOH+CO_(2)to`
`C_(6)H_(5)OH+"CC"l_(4)+NaOHto`
`C_(6)H_(5)OH+CHCl_(3)+NaOHto`

ANSWER :A::B::C
Discussion
9015.

Using IUPAC norms, write the systematic names of the following: [Co(NH_(3))_(4)Cl(NO_(2))]Cl

Answer»

SOLUTION :Tetraamminechloridonitrito-N-cobalt(III) CHLORIDE
Discussion
9016.

The size of the species, Pb,Pb^(2+), Pb^(4+) decreases as -

Answer»

`Pb^(4+) gt Pb^(2+) gt Pb`
`Pb gt Pb^(2+) gt Pb^(4+)`
`Pb gt Pb^(4+) gt Pb^(2+)`
`Pb^(4+) gt Pb gt Pb^(2+)`

ANSWER :B
Discussion
9017.

Which of the following can possibly be used as analgesic without causing addiction and modification ?

Answer»

ACETYLSALICYLIC Acid
N-Acetyl-para-aminophenol
Phenyl salicylate
Methyl salicylate

Solution :N-Acetyl-para-aminophenol is ALSO CALLED PARACETAMOL
Discussion
9018.

What will be the slope of a logPVs logT graph plotted at constant volume?

Answer»

Solution :As per Gay Lusaac’s LAW `P = KT` or `logP = logT + LOGK` . This is a GRAPH of a straight line with `"slope" = 1` and `"INTERCEPT" = logk` .
Discussion
9019.

Writetwo main functionof carbohydratesin plants .

Answer»

Solution :Main functionof carboydrates in PLANTS:
(i) Carbohydratesare used as stronger molecules as strach in plants .
(ii) CELL WALL of bacteria and plantsis madeupof CELLULOSE .
Discussion
9020.

Which of the following metal sols cannot be prepared by Bredig's are method?

Answer»

Copper
Potassium
Gold
Platinum.

ANSWER :B
Discussion
9021.

Which of the following substance on being heated will give a gas that does not turns lime water milky :-

Answer»

`LiNO_(3)`
`ZnCO_(3)`
`ZnSO_(3)`
`MgCO_(3)`

Solution :(i) `LiNO_(3) overset(Delta)to Li_(2)O +NO_(2)+O_(2)`
(ii) `ZnCO_(3) overset(Delta)to ZnO+O_(2)`
(iii) `ZnSO_(3) overset(Delta)to ZnO+SO_(2)`
(IV) `MgCO_(3) overset(Delta)to MgO +CO_(2)`
`CO_(2) & SO_(2)` gas turns lime water into milky
Discussion
9022.

Which of the following can’t be an example of an S_(N)2 reaction?

Answer»

`CH_(3)- CH_(2) - OH overset(-H_(2)O)(rarr) CH_(2) = CH_(2)` <BR>`(CH_(3))_(2) "CHBr" overset(OH^(-))(rarr) (CH_(3))_(2) CH - OH + Br^(-)`
`CH_(3) Br overset(OH^(-))(rarr) CH_(3)OH + Br^(-)`
`(CH_(3))_(3) C - Br overset(OH^(-))(rarr) C-OH + OH^(-)`

ANSWER :A
Discussion
9023.

When ethyl hydrogen sulphate is heated with excess of alcoholat 410 K, the product obtained is

Answer»

ETHANE
Ethylene
Diethyl ETHER
Diethyl SULPHATE.

SOLUTION :NA
Discussion
9024.

Which one of the following statements about the zeolites is false?

Answer»

They are used as cation exchangers.
Theyhave OPEN structure which enables them to take up small molecules.
Zeolites are ALUMINOSILICATES having three dimensional network.
Some of the`SiO_(4)^(4-).` UNITS are replaced by `AlO_(4)^(5-)` and AlO_(6)^(9-)` ions in zeoplites.

Answer :D
Discussion
9025.

Which of the following calcium salts are required to get ethanal by dry distillation process?

Answer»




SOLUTION :
Discussion
9026.

Which of the following colloids cannot be easily coagulated ?

Answer»

IRREVERSIBLE colloids
MACROMOLECULAR colloids
Multimolecular colloids
Lyophobic colloids.

SOLUTION :Macromolecular colloids are quite stable and resemble TRUE solution in may RESPECTS.
Discussion
9027.

Write the formula for the following complex : Pentaamminenitrito-O-Cobalt(III)

Answer»

Solution :Pentaamminenitrito-O-cobalt (III)
`[Co(NH_(3))_(5)(ONO)]^(2+)`
Discussion
9028.

What is the action of the following reagents on glucose? (a) bromine water(b) dilute HNO_(3) hydroxyl amine

Answer»

Solution :(a) Bromine water : When glucose reacts with bromine water, GLUCONIC acid is formed.
`underset("Glucose")(CH_(2)OH) (CHOH)_(4) CHO + [O] overset(Br_(2)//H_(2)O)(to) underset("Gluconic acid")(CH_(2)OH (CHOH)_(4)) COOH`
(b) Dilute `HNO_(3)` : When D-Glucose is treated with nitric acid, oxidation of D-Glucose TAKES place. The aldehyde and alcohol group of glucose are ozidized to carboxylic acids forming D-Glucaric acid.

(C ) Hydroxylamine : D (+) glucose reacts with hydroxyl AMINE and yield an oxime. The structure of the oxime would be:
Discussion
9029.

Which of the following ligand does not as pi-acid ligand?

Answer»

`N_(2)`
`CO`
`C_(2)H_(4)`
`O_(2)^(2-)`

Solution :Due to absence of vacant atomic ORBITAL as well `pi^(**)` molecular orbital `O_(2)^(2-)` does not as `pi` acid LIGAND.
Discussion
9030.

Which products are obtained on electrolysis of concentrated NaCl solution by using graphite as inert electrode ?

Answer»

`H_(2)` on anode, `Cl_(2)` on CATHODE and NAOH in solution.
`O_(2)` on anode and `H_(2)` on cathode
`Cl_(2)` on anode, Na on cathode and NaOH in solution.
`Cl_(2)` on anode, `H_(2)` on cathode and NaOH in solution.

Solution :`Cl_(2)` on anode, `H_(2)` on cathode and NaOH in solution.
Discussion
9031.

What is corrosion? CO_2 is always present in natural water. Explain its effect (increases, stops or no effect) on rusting of Fe.

Answer»

Solution :Corrosion is a process of slowly eating AWAY of the metal DUE to the attack of atmospheric gases on the surface of metal resulting into the formation of compounds such as oxides, sulphides, carbonates, sulphates, etc.
Factors affecting corrosion are:
(i) REACTIVITY of metal.
(ii) PRESENCE of IMPURITIES
(iii) Presence of air and moisture
(iv) Strains in metals
(v) Presence of electrolytes.
`CO_2` increases the rusting of iron greater the number of `H^+` ions, faster the rusting will take place.
Discussion
9032.

What is the order of the reaction ?

Answer»

SOLUTION :ZERO ORDER REACTION.
Discussion
9033.

Which one of the following prevents the incorporation of new amino acids to the protein?

Answer»

atenolol
streptomycin
ERYTHROMYCIN
tetracycline

Solution :erythromycin
Discussion
9034.

What are lyophillic and lyophobic sols ? Give one example of each type. Why are hydrophobic sols easily coagulated ?

Answer»

Solution : Lyophilic COLLOIDS. Lyophilic mean "solvent loving". These are the substances which when mixed with a suitable solvent as the dispersion medium directly from the colloidal solution are called lyophilic solution. Examples : Gum, gelatine, STARCH, rubber, sols.
Lyophobic colloids. Lyophobic mean "solvent heating". These are the substance, when mixed with dispersion medium do not form colloidal solution. Their solution can be PREPARED only by special method, such substances are called lyophobic solution. Examples: METALS and their sulphides sols. Hydrophobic colloids are easily COAGULATED because these are less stable and colloidal particles carry some change.
Discussion
9035.

Which of the following complex species does not involve inner orbital hybridization?

Answer»

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

ANSWER :C
Discussion
9036.

What is the effect of rise in temperature on the solubility of gases in liquids?

Answer»

SOLUTION :DECREASES.
Discussion
9037.

Which of the following halide undergoes hydrolysis on warming with water /aqueous NaOH?

Answer»




SOLUTION :Higher the number of electron WITHDRAWING GROUPS on O-& p-position ,easier is the SUBSTITUTION REACTION and hence milder conditions are used.
Discussion
9038.

Which oxyacid of sulphur has S-O-S link ? How is it prepared?

Answer»

Solution :`H_(2)S_(2)O_(7)` oleum (or) fuming (or) pyrosulphuric acid has `S-O-S` link.
Pyrosulphuric acid is prepared by dissolving sulphur TRIOXIDE in CONCENTRATED SULPHURIC acid.
`SO_(3)+H_(2)SO_(4)rarrH_(2)S_(2)O_(7)`
Discussion
9039.

Which of the following compounds contains both ionic and covalent bonds?

Answer»

`CH_2Cl_2`
`CHCl_3`
`NaClO_4`
`PCl_3`

ANSWER :C
Discussion
9040.

which of the following amines form foul smelling compound on heating with chloroform and ethanol KOH?

Answer»




Both(1)&(3)

ANSWER :D
Discussion
9041.

Which of the following is a lo amine?

Answer»

Tert. BUTYLAMINE 
Dimethyl amine 
N-Methylaniline 
N, N-Dimethyl aniline 

ANSWER :A
Discussion
9042.

Which of the following would be attracted towards magnetic field

Answer»

Zn
Mn
Mg
Cd

Answer :B
Discussion
9043.

To differentiat between C-12, C-13 and C-14 the instrument that you would use is

Answer»

Infra-red spectrometer
Atomic ABSORPTION spectrometer
Mass spectrometer
Ultraviolet spectrometer

Solution :N//A
Discussion
9044.

Which of the following group destabalise the phenoxide ion?

Answer»

`NO_2`
`-CHO`
COR
OH

Answer :D
Discussion
9045.

What is meant by Faraday? How is it calculated?

Answer»

Solution :ONE Faradayis defined as the CHARGE of one mole of ELECTRON.
Charge of one electron = `1.6 xx 10^(-19)C`
Charge of 1 mole of electrons = `6.023 xx 10^23 xx 1.602 xx 10^(-19) C`
`= 6.023 xx 10^(23) xx 1.602 xx 10^(-19)C`
`= 96488 C`
`i.e., IF ~= 96500 C` .
Discussion
9046.

Which of the following ions has magnetic moment of 1.73 B.M. ?

Answer»

`CO^(2+)`
`Fe^(3+)`
`CU^(2+)`
`Ni^(2+)`

Answer :C
Discussion
9047.

Which substance removes As_(2)O_(3) in contact process ?

Answer»

SOLUTION :`FE(OH)_(3)`
Discussion
9048.

Towards which electrode would an alpha-amino acid migrate in an electric field at (i) p H lt p I, (ii) p H gt p I and (iii) p H=p I? Explain.

Answer»

<P>

Solution :The general formula of an amino acid is
`H_(3)overset(+)N-UNDERSET("Zwitterion")underset(R)underset(|)(CH)-COO^(-)overset(H^+)underset(OH^-)hArrH_(3)overset(+)N-underset((I))underset(R)underset(|)(CH)-COOHoverset(H^-)underset(OH^+)hArrH_2N-underset((II))underset(R)underset(|)(CH)-COO^(-)`
(i) Which `p H lt p I`, i.e., the solution is acidic , the cation (I) predominates and therefore , the amino acid MIGRATES towards cathode.
(ii) When `pH GT pI `, i.e., the solution is basic the anion (II) predominates, therefore , the acid migrates towards anode.
(iii) When `pH=pI` , the amino acid predominantly exists as a zwitterion. That is there is no net charge on the amino acid and hence it does not migrate.
Discussion
9049.

Which of the following represents macromolecular colloidal particles?

Answer»

SOLUTION of gold
CELLULOSE
Soaps
Synthetic detergents

Solution :Cellulose is MACROMOLECULAR COLLOID.
Discussion
9050.

When primary amines react with nitrous acid, the gas evolved is

Answer»

`N_(2)`
`NH_(3)`
`CO_(2)`
`CO`

SOLUTION :When PRIMARY AMINES react with NITROUS acid, then NITROGEN gas is evolved and alcohol is formed.
`RCH_(2)NH_(2)+HNO_(2)rarr R CH_(@)OH+N_(2)+H_(2)O`
Discussion