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201.

What will be product when glycine, is heated -

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SOLUTION :
Discussion
202.

Write IUPAC names of following compounds. (a)

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ANSWER :A::B::C::D
Discussion
203.

Which of the following alkene on acid catalysed hydration form propan-2-ol

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`CH_3CH=CH_2`
`(CH_3)_2C=CH_2`
`CH_3CH=CHCH_3`
`CH_3CH_2CH=CH_2`

Solution :Addition of WATER occurs according to Markownikoff's RULE
`CH_3CH=CH_2 OVERSET(H_2O // H_2SO_4)to CH_3CHOHCH_3`
Discussion
204.

Write down the IUPAC names of A, B and C.

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ANSWER :A : Propanonic ACID, B : BUTANE, C : 2-bromobutanoic acid
Discussion
205.

Which of the following alkali metal is expected to melt if the room temperature rises to 30^(@)C ?

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Na
K
Rb
Cs

Answer :D
Discussion
206.

When N_2 gas is passed through water at 293 K, how many moles of1N_2 woulddissolve in one litre water ? Assume that N_2 exert a partial pressure of 0.987 bar. K_H for N_2 at 293 K is 76.48 kilobar.

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Solution :By Henry.s law, MOLE fraction of `N_2 = P_(N_2)/K_H` =(0.987 bar)/(76480 bar) =`1.29xx10^(-5)`. One LITER water CONTAIN 55.5 mols of it. Let .n. be the number of mols of NITROGEN in solution , then,
`X_(N_2)= n/(n+55.5)= 1.29xx10^(-5)`
`therefore=1.29xx10^(-5)xx55.5=7.16xx10^(-4)`mol
Discussion
207.

Which of the following is not a tranquilizer

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Luminal
Seconal
Valium
Alitame

ANSWER :D
Discussion
208.

Which one of the followingis a watersolublevitamin C ?

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VITAMIN A
Vitamin D
Vitami C
Vitamin K

Answer :C
Discussion
209.

What are the units of molar conductivity?

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Solution :`OHM^(-1)cm^(2)mol^(-1)` or S `cm^(2)mol^(-1)`.
Discussion
210.

Which of the following elements not belongs to the d-block elements?

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PR
Pb
Tb
Ho

Answer :A::B::C::D
Discussion
211.

What causes charge on sol particles ?

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Solution :The CAUSES of charge on sol particles are :
(a) Preferential adsorption of ions from solution.
(B) ELECTRON capture by sol particles during electrodispersion. (C) FORMATION of electrical double layer.
Discussion
212.

X+NH_(3)overset(50^(@)C)toYoverset(H^(+)//H_(2)O)toH_(2)N-CH_(2)COOH Compound X is

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Chloroacetic acid
Bromoaceticacid
outside the helix
Acetic acid

Answer :C
Discussion
213.

Which of the following option are not in accordance with the property mentioned against them ?

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`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)""`Oxidising power
`MI gt MBR gt MCl gt MF""`Ionic character of metal halide
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)""` Bond dissociation ENTHALPY
`HI lt HBr lt HCl lt HF""` Hydrogen-HALOGEN bond strength

Solution :Ionic character increases as the electronegativity of halogen increases, i.e., MI lt MBr lt MCl lt MF. Due to small size, the lone pair of electrons on the two F atoms repel each other and hence bond dissociation enthalpy of `F_(2)` is lower than that of `Cl_(2) and Br_(2)`. The actual order is : `Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`. Thus, options (B) and (c) are not CORRECT.
Discussion
214.

Which of the following statements about D(+) glucose is/are true?

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Naturally occurring glucose is dextrorotatory
It reduce AMMONIACAL `AgNO_(3)` solution
On polymerisation it forms galactose
It forms CYANOHYDRIN on REACTION with HCN

Answer :A::B::D
Discussion
215.

Write the IUPAC name of the monomer of natural rubber.

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SOLUTION :2 - Methylbuta -1, 3 - DIENE
Discussion
216.

Which one is buffer solution

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`[PO_(4)^(-)] [HPO_(4)^(-)]`
`[PO_(3)^(3-)] [[H_(2)PO_(4)^(-)]`
`[HPO_(4)^(-)] [H_(2)PO_(4)^(-)]`
All of these

SOLUTION :[Normal SALT + acidic salt] is a buffer solution.
Discussion
217.

When ethyl hydrogen sulphate in heated with ethanol at 413 K, the product formed is

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ethyne
ethene
diethyl ether
diethyl sulphate

Solution :`CH_3CH_2OSO_2OH+ HOCH_2CH_3 to CH_3CH_2OCH_2CH_3+H_2SO_4`
Discussion
218.

Write the structures of A, B and C in the following : (i) C_(6)H_(5)-CONH_(2) overset("Br_(2)//aq.KOH)(rarr)A underset(0-5^(@)C)overset(NaNO_(2)+HCl)(rarr)B overset(KI)(rarr)C (ii) CH_(3)-Cl overset(KCN)(rarr)A overset(LiAlH_(4))(rarr)B underset(Delta)overset(CHCl_(3)+alc.KOH)(rarr)C

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Solution :(i) `A=underset(underset("DIAZONIUM CHLORIDE")("ANILINE"))(C_(6)H_(5)NH_(2)),""B=underset("Benzene")(C_(6)H_(5)N_(2)^(+)Cl^(-)), ""C=underset("Iodobenzene")(C_(6)H_(5)I)`
(ii) `A=underset(underset("cyanide")("Methyl"))(CH_(3)CN), ""B=underset("Ethanamine")(CH_(3)CH_(2)NH_(2)), ""C=underset("Ethyl isocyanide")(CH_(3)CH_(2)NC)`
Discussion
219.

Volume of O_(2) obtained at 2 atm & 546K, by the complete decomposition of 8.5 g NaNO_(3) is

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2.24 lt.
1.12 lt.
0.84 lt.
0.56 lt.

Answer :B
Discussion
220.

Write structures of the compound whose IUPAC names are as follows : 1-Phenylpropan-2-ol

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SOLUTION :
Discussion
221.

Which monomer is responsible for the flexibility property in PHBV ?

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`HO-UNDERSET(CH_(3))underset("|")"CH"-CH_(2)-CH_(2)-COOH`
`HO-underset(CH_(3))underset("|")"CH"-CH_(2)-COOH`
`{:(HO-CH-CH_(2)-COOH),("|"),(""CH_(2)-CH_(3)):}`
`{:(HO-CH-CH_(2)-CHO),("|"),(""CH_(2)-CH_(3)):}`

Answer :C
Discussion
222.

Which catalyzed biological reaction

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hormones
enzymes
Glycogene
fats

Answer :B
Discussion
223.

What is the change in entropy when 2.5 mole of water is heated from 27^(@) to 87^(@) C ? Assume that the heat capacity is constant . (C_(p.m)(H_(2)O) = 4.2 J//g-k In (1.2)= 0.18)

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`16.6` J/K
`9` J/K
`34.02` J/K
`1.89` J/k

Solution :N//A
Discussion
224.

Which one of the following is employed as antihistamine?

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Chloromphenicol
Diphenylhydramine 
Norothindrone
(A) & (B) Both 

ANSWER :D
Discussion
225.

What is the name given to the linkage which holds together two monomeric units in polysaccharides?

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SOLUTION :GLYCOSIDIC LINKAGE.
Discussion
226.

Which option is True (T) and False (F) for IUPAC name of K_(3)[Fe(CN)_(6)]? (i) potassium hexacyanido ferrate(III) (ii) tripotassium hexacyanido ferrate (iii) potassium haxacyanido ferrate (-3) tripotassium hexacyanido ferrate (III)

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TTTF
TTFF
TFFF
TFTF

Solution :N//A
Discussion
227.

Which one of the following species is stable in aqueous solution ?

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`CR^(2+)`
`MnO_(4)^(2-)`
`MnO_(4)^(3-)`
`Cu^(+)`

SOLUTION :In `MnO_(4)^(2-)` manganese is in + 6 OXIDATION state which is having highest stability .
`MnO_(4)^(2-)` disproptionates in nerutal or acidic solution.
`3 MnO_(4)^(2-) + 4H^(+) rarr 2MnO_(4)^(2) + MnO_(2) + 2H_(2)O`
Discussion
228.

When Cl_(2) water is added to a salt solution containing chloroform, chloroform layer turns violet. Salt contains

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`CL^(-)`<BR>`I^(-)`
`NO_(3)^(-)`
`S^(2-)`

Solution :As `Cl^(-)` is more electronegative than `Br^(-) and I^(-)`
`therefore` it replaces them from their salt as
`2I^(-)+Cl_(2) toI_(2)+2Cl^(-)implies`Violet vapour
`2Br^(-)+Cl_(2)toBr_(2)+2Cl^(-)implies`Brown vapour
Discussion
229.

Which of the following is an antifertility drug?

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Novestrol
Terpineol
Chloroxylenol
Bithional

Answer :A
Discussion
230.

Which of the following used in medical field such as surgical sutures, plasma substitute?

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PHBV
PLA
PCL
all the above

Solution :all the above
Discussion
231.

Which of the following sols cannot be prepared by boiling the dispersed phase with dispersion medium (water)?

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Egg ALBUMIN sol in water
Gum sol in water
Starch sol in water
none of these

Solution :Egg albumin sol, if boiled, will COAGULATION due to DENATURATION of the globular proteins present in egg albumin.
Discussion
232.

Which of the following is more reactive in nucleophilic substitution reaction

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ANSWER :C
Discussion
233.

What happeas when an emulation is centrifuged?

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SOLUTION :DEMULSIFICATION or BREAKS into CONSTITUENT LIQUIDS
Discussion
234.

What are homopolymers and copolymers ?

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SOLUTION :HOMOPOLYMERS. It is a polymer made up of only one type of monomers.
Copolymers. COPOLYMER is a polymer made up of TWO or more different types of monomers. e.g. Buna-S, Nylon-66.
Discussion
235.

Which of the following will be the most stable diazonium salt, RN_(2)^(+)X^(-)?

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`CH_(3)N_(2)^(+)X^(-)`
`C_(6)H_(5)N_(2)^(+)X^(-)`
`CH_(3)CH_(2)N_(2)^(+)X^(-)`
`C_(6)H_(5)CH_(2)N_(2)^(+)X^(-)`

Solution :DUE to delocalization of the +ve charge on the benzene ring, aromatic diazonium salts are more stable.
Discussion
236.

Which one of the following has lowest bond dissociation energy

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Cl-Cl
F-F
Br-Br
l-l

Solution :
HENCE , lowest bond DISSOCIATION ENERGY is of `I_(2)`.
Discussion
237.

Which of the following prtoducts is not formed at the anode in the hall -Heroult electrolysis process?

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`CO_(2)`
`O_(2)`
`Cl_(2)`
`F_(2)`

Answer :3
Discussion
238.

Total volume of simple cube is = …….

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`4r^3`
`2r^3`
`(16 PI r^3)/(SQRT3)`
`8r^3`

ANSWER :D
Discussion
239.

Write Gibb's free energy equation and name the terms in it.

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SOLUTION :`G=H-TS`
or `DELTA G=Delta H-T Delta S`
G= Free ENERGY
H= Enthalpy
T= Temperature in KELVIN
S= ENTROPY
Discussion
240.

Which is not innertransition compound?

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TiC
VC
WC
SiC

Answer :D
Discussion
241.

Which of the following M.Os. Containing electron/electrons has highest energy in B_(2) molecule ?

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`sigma 2s`
`sigma 2 p_(Z)`
`PI 2 p_(x)`
`sigma^(**)2s`.

Solution :Electronic configuration of `B_(2)` is : `(sigma 1s)^(2)(sigma^(**)1s)^(2)(sigma 2s)^(2)(sigma^(**)2s)^(2)(pi 2p_(x))^(1)(pi 2PY)^(1)`
Discussion
242.

Which of the following reactions will not yield phenol ?

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ANSWER :D
Discussion
243.

The restriction of the biological nature and activity of proteins by heat or chemical agent is called

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dehydration
denaturation
deoxidation
denitrogenation

Answer :B
Discussion
244.

Which of the following give lower abnormal molecular weight than ideal in a colligative experiment ?

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NaCl
Glucose
`MgCl_(2)`
urea

Answer :A::C
Discussion
245.

Which of the following NOT present in DNA?

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ADENINE
GUANINE
THYMINE
URACIL

ANSWER :D
Discussion
246.

Which of the following process is not associated with recovery of the silver

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As a side producti in electrolytic REFINING of copper.
Parke's PROCESS in which Zn is USED to extract silver by solvent extraction from molten lead.
By reaction of silver sulphide with KCN and then reaction of SOLUBLE complex with Zn.
By boiling `Na[Ag(CN)_(2)]` aq.

Answer :D
Discussion
247.

Which of the substance added to soap to make it antiseptic

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IODINE
`KMnO_4`
BITHIONAL
`Cl_2`

ANSWER :C
Discussion
248.

Which of the following products ether, when heated with conc. H_(2)SO_(4) at 413 K?

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ORGANIC ACID
ALDEHYDE
Alcohol
Ketone

ANSWER :C
Discussion
249.

Whatare LDF are HDPE ? Howare they prepared ?

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Solution :LDPE is LOW densitypolyethylene and HDPE is highdensity polyethylene. LDPE is preparedby polymerisationof ETHENE at temperatureof `200^(@)C` and high pressureof 100 atm in the presence of peroxideinitiator .It isa branched CHAIN polymer.
HDPE is prepared bypolymerisationof ethene at a temperaturebelow `100^(@)C` and pressureless than 100 atm is the presenof Ziegler - Natta CATALYST. Itis a linear polymer .
Discussion
250.

When KMnO_4, reacts with acidified FeSO_4

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Both `FeSO_4` and `KMnO_4` are oxidised
Both `FeSO_4` and `KMnO_4` are REDUCED
`FeSO_4` is oxidised and `KMnO_4` is reduced
`FeSO_4` is reduced and `KMnO_4` is oxidised

ANSWER :C
Discussion