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6001.

Which of the following reacts with COCl_2 to give phenylisocyanate :

Answer»

Aniline
Aminophenol
Nitrobenzene
Chlorobenzene

Answer :A
Discussion
6002.

Unit of molar conductivity are :

Answer»

`Ohm^(-1)m^(2)MOL^(-1)`
`ohmm^(2)mol^(-1)`
`ohm^(-1)m^(2)mol^(-1)`
`ohm^(-2)mol^(-1)m^(2)`

ANSWER :B
Discussion
6003.

Which one of the following is not a colloid ?

Answer»

milk
Blood
ice-cream
urea solution

Answer :D
Discussion
6004.

The worng statement regarding Dewars method of scparation of noble gases is

Answer»

All lnert gases can be adsorbed over charcoal
LOWER the atomic NUMBER of the gas, lower is the temp needed to ADSORB it
heavier gases have GREATER degree of adsorption
He cannot be adsorbed over charcoal

Answer :A
Discussion
6005.

Which of following aqueous mixture of CH_(3)COOHand CH_(3)COONawill have maximum buffer capacity?

Answer»

`[CH_(3)COOH] = 1M, [CH_(3)COONA] = 10^(-3)M`
`[CH_(3)COOH] = 0.1 M, [CH_(3)COONa] = 10^(-5)M`
`[CH_(3)COOH] = 0.1 M, [CH_(3)COONa] = 0.1 M`
`[CH_(3)COOH] = 0.001M, [CH_(3)COONa] = 0.1 M`

Solution :ACIDIC buffer having pH= pKa has maximum buffer capacity
Discussion
6006.

When CH_3CH_2CH Cl_2 is treated with NaNH_2, the product formed is:

Answer»

`CH_3-CH=CH_2`
`CH_3-CequivCH`

ANSWER :B
Discussion
6007.

Which of the following compound has negligible enol?

Answer»




`CH_(3)-OVERSET(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

Solution :NA
Discussion
6008.

What forces are involved in holding the active sites of enzymes ?

Answer»

Solution :The FORCES INVOLVED in holding the active sites of enzymes are HYDROGEN bonding, ionic bonding, dipole-dipole ATTRACTIONS or VAN der Waal’s forces of attraction.
Discussion
6009.

Which one of the following substance has the highest proton affinity

Answer»

`H_(2)O`
`H_(2)S`
`NH_(4)`
`PH_(3)`

Answer :C
Discussion
6010.

The spin magnetic moment of the compound Hg[Co(SCN)_(4)] is

Answer»

`SQRT3`
`sqrt15`
`sqrt24`
`SQRT8`

SOLUTION :`mu=sqrt(N(n+2))BM`
Discussion
6011.

underset("(aq solu)")(Bbar(b))+Cl_(2) rarr underset("[Separated solution by passing air]")(Br_(2) + 2 bar(C ) I) The oxidation state of central atom is acid (D)

Answer»

`+1`
`+3`
`+5`
`+7`

Solution :`5NaBr + NaBrO_(3) + 3H_(2)SO_(4) RARR underset("(C )")(5HBr)+underset("(D)")(HBrO_(3)) + 3Na_(2)SO_(4)`
Discussion
6012.

Which of the following polymer undergoes permanent change on heatingandcan not be reused ?

Answer»

UREA METHANAL
Buna-s
DACRON
POLYTHENE

ANSWER :A
Discussion
6013.

Which of the following colligative properties is associated with the concentration term molarity ?

Answer»

LOWERING of vap.pressure
Osmotic pressure
Depression in f.p.
Elevation in B.p.

Answer :B
Discussion
6014.

Which of the following are chiral:

Answer»

`1, 2, 3`
`1, 2, 4`
`2, 3, 4`
`1, 3, 4`

ANSWER :A
Discussion
6015.

Which of the group 16 elements is not called chalcogen ?

Answer»

S
Se
Te
Po

Answer :D
Discussion
6016.

Which of the following reagents will convert p - methylbenzenediazonium chloride into p - cresol?

Answer»

CU POWDER
`H_(2)O`
`H_(3)PO_(2)`
`C_(6)H_(5)OH`

Solution :
Discussion
6017.

Which of the following is industrially prepared by passing ethylene into hyp[ochlorous acid

Answer»

ETHYLENE GLYCOL
Ethylene oxide
Ethylene dinitrate
Grignard synthesis

Solution :`underset("Ethylene")(H_(2)C=CH_(2))+underset("(HYPOCHLOROUS)")(HOCl)to underset("Ethylene chlorohydrine")underset(Cl)underset(|)(H_(2)C-O-MgI)OVERSET([NaHCO_(3)])tounderset("(Ethylene glycol)")(underset(OH)underset(|)(H_(2)C)-underset(OH)underset(|)(CH_(2)))+NaCl+CO_(2)`
Discussion
6018.

What are the limitations of crystal field theory?

Answer»

Solution :The limitations of CRYSTAL field THEORY are as follows :
(1) This theory is APPLICABLE to metal ions with d-orbitals and does not explain about s- and p-orbitals.
(2)It does not explain z bonding in the coordination compounds.
(3) This theory considers electrostatic attraction between central metal ion and ligands, hence considers only ionic bonds between them but does not account for covalent nature between them or coordínate bonds.
(4) WATER `(H_(2)O)` is a STRONGER ligand than `OH^(-)` which cannot be explained by this theory satisfactorily.
Discussion
6019.

The value of EMF of standard electrode at 25^@C is…………….. .

Answer»

MAXIMUM
ZERO
NEGATIVE
positive.

Answer :B
Discussion
6020.

The relation between change is internal energy (DeltaE), change in enthalpy (DeltaH) and work done (W) is represented as

Answer»

`DeltaH=DeltaE+W`
`W=DeltaE-DeltaH`
`DeltaE=W-DeltaH`
`DeltaE=DeltaH+W`

SOLUTION :`DeltaH=DeltaE+W" or "DeltaH=DeltaE+PDeltaV`.
Discussion
6021.

Which of the following is not a tranquillizer ?

Answer»

BARBITURIC acid
Seconal
Luminal
PHENACETIN.

ANSWER :D
Discussion
6022.

Which of the following compound on treatment with a solution of HgCl_(2) first gives a white ppt. and then grey ppt.?

Answer»

`H_(3)PO_(2)`
`SnCL_(2)`
KI
`NH_(3)`

Solution :`2HgCl_(2) + SnCl_(2) to underset("White ppt")(Hg_(2)Cl_(2))+SnCl_(4), HgCl_(2) + SnCl_(2) to underset("grey")(2Hg)+SnCl_(4)`
Discussion
6023.

Which of the following statements are correct about sulphur hexafluoride ?

Answer»

all `S-F` bonds are EQUIVALENT
`SF_(6)` is a planar molecule
oxidation NUMBER of sulphur is the same as number of electrons of sulphu involved in bonding
sulphur has acquired the elctronic STRUCTURE of the gas argon

Answer :A::C
Discussion
6024.

Which combination is correct

Answer»

(I)(iii)(S)
(II)(iv)(R)
(III)(ii)(P)
(IV)(i)(Q)

SOLUTION :(I)No colour in flame TEST (Be)
BeO is Amphoteric oxide in nature
`(BeH_2)_n`

electron deficient and polymeric
(II)Violet colour in flame test ( K METAL)
`KO_2`(Potassium SUPER oxide ) is orange yellow
`KO_3`(Potassium ozonide) is orange-red solid
(III)yellow colour in flame test (Na metal)
`Na_2CO_3`(sodium CARBONATE ) is manufactured by solvay process
microcosmic salt `to Na(NH_4)HPO_4. 4H_2O`
Discussion
6025.

Which of the following compounds will exhibit geometrical isomerism?

Answer»

1-phenyl-2-butene
3-phenyl-1-butene
2-phenyl-butene
1,1-Diphenyl-1-propene

Answer :A
Discussion
6026.

Write the following in the complex [Cr(en)_(3)][CrF_(6)] (i) Types of complex (ii) Ligands (iii) central metal (iv) Oxidation state of central metal(v) IUPAC name

Answer»

SOLUTION :
Discussion
6027.

When ethyl alcohol is oxidised with Cl_2, it gives :

Answer»

`CH_3CHO`
`CH_3COCH_3`
`CH_3COCI`
`COCI_2`

ANSWER :A
Discussion
6028.

Which of the following terms are correct about enzymes ?

Answer»

PROTEINS
DINUCLEOTIDES
Nucleic acids
BIOCATALYST

ANSWER :A::D
Discussion
6029.

Which of the following does not react with oxygen directly ? Zn, Ti, Pt, Fe

Answer»

SOLUTION :PT does not REACT with OXYGEN DIRECTLY
Discussion
6030.

Which of the following are isoelectronic molecules ?

Answer»

`NO^(+)`and`F_(2)^(2-)`
CO and `O_(2)^(2-)`
CO and `NO^(+)`
`O_(2)^(2-)`and`N_(2)`

Solution :`CO(6+8)` and `NO^(+)(7+8-1)`are ISOELECTRONIC.
Discussion
6031.

The vapour pressure of the solution M is -

Answer»

39.3 MM H
36.0 mm HG
29.5 mm Hg
28.8 mm Hg

Solution :`p=p^0x_A`
`=40xx0.9=` mm Hg
Discussion
6032.

The vapour pressure of two pure liquids A and B, that form an ideal solution are 100 and 900 torr repectively at temperature T. This liquid solution of A and B is composed of 1 mole of A and 1 mole of B. What will be the pressure, when 1 mole of mixture has been vaporized ?

Answer»

`800` torr
`500` torr
`300` torr
None of these

Solution :Let `N_(B)` mole of `B` present in `1` mole of mixture that has been VAPORIZED. Thus `y_(B)=(eta_(B))/(1)`
Mole fraction of `B` in the remaining LIQUID phase will be `x_(B)=(1-eta_(B))/(1)`
`x_(B)=(P-P_(T)^(@))/(P_(B)^(@)-P_(T)^(@))` ....(1)
`[because P=P_(T)^(@)+(P_(B)^(@)-P_(T)^(@))x_(B)]`
and `y_(B)=(P_(B))/(P) RARR (P_(B)^(@)x_(B))/(P)` ....(2)
After substitution of values of `x_(B)` and `y_(B)` in (1) and (2)
we get `1-n_(B)=(P-P_(T)^(@))/(P_(B)-P_(T)^(@))` .....(3)
and `n_(B)=((1-n_(B))P_(B)^(@))/(P)` ....(4)
or `n_(B)=(P_(B)^(@))/(P+P_(B))`
so `1-(P_(B)^(@))/(P+P_(B))=(P-P_(T)^(@))/(P_(B)^(@)P_(T)^(@))`
`rArr p=sqrtP_(B)^(@).P_(T)^(@)=sqrt100xx900`
`rArr 300` torr
Discussion
6033.

Two metals M_(1) and M_(2) have reduction potential values of -xV and +yV respectively. Which will liberate H_(2) in H_(2)SO_(4)?

Answer»

Solution :METALS having negative REDUCTION potential ACTS as powerful reducing agent. SINCE `M_1` has `-xV,` therefore `M_1` having `+xV`, oxidation potential will liberate `H_2` from `H_2SO_4`.
Discussion
6034.

Urea reacts with hydrazine to form :

Answer»

Nitrogen
Phenyl hydrazine
Semicarbazide
Urethane

Answer :C
Discussion
6035.

What happens when Diazonium chloride reacts with phenol in basic medium ?

Answer»

SOLUTION :
Discussion
6036.

Which acid is used in baking powder :

Answer»

OXALIC ACID
CITRIC acid
LACTIC acid
Tartaric acid

Answer :D
Discussion
6037.

Which of the following shaded plane in fcc lattice contains arrangement of atoms as shown below:

Answer»





Solution :The plane is PASSING through6 ATOMS PRESENT on two OPPOSITE face DIAGONALS.
Discussion
6038.

Which type of detergent is formed when stearic acid reacts with polyethylene glycol?

Answer»

Cationic detergent
Anionic detergent
Non- IONIC detergent
None of these

Solution :Non- ionic detergent is FORMED when STEARIC acid REACTS with polyethylene glycol.
Discussion
6039.

What happens when : (write only chemical reactions) (a) iodine is treated with SnCl_(2). (b) carbondioxide is passed through a concertrated aqueous solution of sodium chloride saturated with ammonia. ( c) red lead is treated with nitric acid. (d) dilute nitric acid is slowly reacted with tin.

Answer»

Solution :(a)`2SnCl_(2)+l_(2)to2SnCl_(2)l_(2)toSnCl_(4)+Snl_(4)`
(B)`NaCl+NH_(4)OH+CO_(2)toNAHCO_(3)+NH_(4)Cl`
( c)`Pb_(3)O_(4)+4HNO_(3) to 2PB(NO_(3))_(2)+PbO_(2)+2H_(2)O`
(d)`Sn+10HNO_(3)`(dilute)`to 4Sn(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O`
Discussion
6040.

Uranium isotopes are usuallyseperated by using compounds of the halogen

Answer»

`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

ANSWER :A
Discussion
6041.

Which of the following has higher molar heat of vaporisation ?

Answer»

`H-F`
`H-Cl`
`H-Br`
`H-Cl`

ANSWER :A
Discussion
6042.

When a certain amount of ethyene was combusted, 6226 kJ heat ws evolved. If heat of combustion of ethylene is 1411 kJ, the volume of O_(2) (at NTP) that entered into the reacction is

Answer»

296.5 mL
98.84 LITRE
`6226 XX 22.4` litre
22.4 litre

ANSWER :B
Discussion
6043.

What are the number of atoms in end centred unit cell ?

Answer»

4 
1 
2
6 

ANSWER :C
Discussion
6044.

What kind of reaction that chlorine undergoes with alkali?

Answer»

Solution :Chlorine undergoes disprotionation with ALKALI. Chlorine is REDUCED to chloride and simultaneously oxidised to hypochlorite or CHLORATE.
Discussion
6045.

What does the negative sign in the expression E_(Zn^(2+)|Zn)^(Theta)=-0.76V mean ?

Answer»

Solution :* As the NEGATIVE value of REDUCTION POTENTIAL of metal is more, metal become more reactive. Such metal get easily oxidized with respect to `H_(2)`. And such metal produced `H_(2)` gas on reaction with acid. Metal will be soluble in acid. Here, `H^(+)` is reduced and metal Zn get oxidized. They will form anode of Zn and cathode of `H_(2)` in galvanic cell.
Discussion
6046.

Which of the following reaction is used for detecting the presence of carbonyl group in aldehydes and ketones ?

Answer»

REACTION with hydroxylamine
REACTIONWITH phenyl HYDRAZINE
Reaction with hydrazine
All of these

ANSWER :D
Discussion
6047.

Which ketone will form 3- ethylpentan -3-ol on treatment with ethy1 magnesium bromide ?

Answer»

Acetone
Ethylmethyl KETONE
ACETOPHENONE
DIETHYL ketone

Answer :D
Discussion
6048.

T/FVulcanised rubber is a semi-synthetic polymer.

Answer»


ANSWER :1
Discussion
6049.

Which of the following alcohols gives a red colour in victor meyer test :-

Answer»

N – propyl alcohol
Isopropyl alcohol
Tert BUTYL alcohol
SEC butyl alcohol

Answer :A
Discussion
6050.

What of the following reaction represents alpha,gamma elemination reaction ?

Answer»

`CH_(3)CHOoverset(OH^(-))(to)overset(OH)overset(|)(CH_(3)CHCH_(2))CHO`
`CH_(3)CH_(2)CH_(2)CH_(2)Broverset("alc.KOH)(to)CH_(3)CH_(2)CH=CH_(2)`

`BrH_(2)C-CH_(2)-CH_(2)Broverset("Zn dust")(to)H_(2)C-CH_(2)`

Answer :D
Discussion