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5201.

Which of the following give alcohol on reduction?

Answer»

Alkylcyanide
NITROALKANE
Alkylnitrite
AMIDES

Solution :`underset("ALKYL nitrite")(R-O-N=O)+6[H] overset(Sn//HCl)to R-OH+NH_(3)+H_(2)O`
Discussion
5202.

Which of the following pairs will form the same osazone?

Answer»

D-Glucose, D-Allose
D-Glucose, D-Altrose
D-Allose, D-Altrose
D-Fructose, D-Galactose

ANSWER :C
Discussion
5203.

When 1-chloro-4-methyl-1, 3-cyclopentadiene (A) is solvolysed in aqueous acetone three isomeric alcohols are obtained. Write the structure of the alcohols.

Answer»

SOLUTION :
Discussion
5204.

The solubility of AgCl (K_(ap) = 1.2 xx 10^(-10)) in a 0. 10 M NaCl solution is

Answer»

`1.2 XX 10^(-10)M`
`1.2 xx 10^(-6)` M
`1.2 xx 10^(-9)` M
0.1 M

Answer :C
Discussion
5205.

Which of the following is not isostructural with SiCl_(4)^(4-)?

Answer»

`SO_(4)^(2-)`
`PO_(4)^(3-)`
`NH_(4)^(+)`
`SCl_(4)`.

Answer :D
Discussion
5206.

Which of the following acids has the smallest dissociation constant

Answer»

`CH_(3)`CHFCOOH
`FCH_(2) CH_(2)`COOH
`"BrCH"_(2) CH_(2)` COOH
`CH_(3)` CHBrCOOH

Solution :SMALLEST ACID dissociation constant will be possessed by the weakest acid out of these. 3-bromo PROPANOIC acid WIL be the weakestdue to the least -I effect of Br
Discussion
5207.

Under what conditions will the following reactions go in the forward direction? N_(2)(g)+O_(2)(g)hArr2NO(g)-43.2 Kcal

Answer»

<P>

SOLUTION :High T, any P , excess of `N_(2)` and `O_(2)`
Discussion
5208.

Which metalls) is (are) generallyfound in native state?

Answer»

Fe
Co
Au
Na

Solution :METALS like Ag, Cu, etc are AVAILABLE in FREE STATE.
Discussion
5209.

Which of the following methods cannot be used for the preparation of an ester:

Answer»

`RCOOH+R'OH+OH^-`
`RCOCI+R'OH+Pyridine`
`RCOOH+R'OH+H^+`
`(RCO)_2O+R'OH+Pyridine`

ANSWER :A
Discussion
5210.

Which of the following ligands can act as hexadentate ligand?

Answer»

acetylacetonato
ETHYLENEDIAMINE
EDTA
1-10-phenanthroline.

ANSWER :C
Discussion
5211.

Which product is obtained when glucose is reacted with Tollen's reagent ?

Answer»

MONO CARBOXYLIC acid
Dicarboxylic acid
Ketone
KETO acid

Solution :Mono carboxylic acid
Discussion
5212.

Which of the following will be completely or partially dissolved in NH_(4)OH?

Answer»

AGCL
AgBr
`PbSO_(4)`
Agl

Solution :AgCl is completely soluble while AgBr is partially soluble in `NH_(4)OH`.
Hence, (A) and (B) are the correct answers.
Discussion
5213.

What are the concepts of catalysis that intermediate compound formation theory throws light on?

Answer»

SOLUTION :INTERMEDIATE COMPOUND FORMATION theory :
(i) the specificity of a catalyst and (ii) the increase in the rate of the reaction with increase in the concentration of a catalyst.
Discussion
5214.

Which of the following voltage is used in cottrell's precipitator?

Answer»

5000 V
50,000 V
1,000V
10,000V

SOLUTION : 50,000 V
Discussion
5215.

Which of the following statement is not true about glucose ?

Answer»

it is an aldohexose
on heating with HI it forms n-hexane
it is present in furanose FORM
it does not GIVE 2, 4-DNP TEST

ANSWER :C
Discussion
5216.

Write the principle of the following : Chromatography.

Answer»

Solution :This method is BASED on the principle that different components of a mixture are DIFFERENTLY adsorbed on an adsorbent. The mixture is put in a liquid or GASEOUS medium which is moved through the adsorbent. Different components are adsorbed at different LEVELS on the column.
Discussion
5217.

Which of the following has -O-O- linkage ?

Answer»

<P>`H_(4)P_(2)O_(8)`
`H_(4)P_(2)O_(7)`
`H_(2)PO_(4)`
`(HPO_(3))_(n).`

Answer :A
Discussion
5218.

Which of following solution is most concentrated?

Answer»

4% NAOH aq.
4% NaOH SOLUTION,`d_("solution")=1.1`(gm/ml)
4 grams of NaOH DISSOLVED in 80 ml solution
all of these solutions are equally concentrated

Solution :If 4g of NaOH dissolved in 80 ml solution then
`M=(4//40)/0.08=1.25M`
Discussion
5219.

Which polymer is used in the manufacture of unbreakable crockery?

Answer»

SOLUTION :MELAMINE
Discussion
5220.

The substance used as an activator in froth floation process

Answer»

Potasium ethyl xanthate
NaCN
`CuSO_(4)`
PIPE oil

Solution :`CuSO_(4)`USED as an activator in FROTH floatation PROCESS.
Discussion
5221.

Which of the following is not used as an explosive

Answer»

TRINITROTOLUENE
Trinitrobenzene
PICRIC ACID
Nitrobenzene

Solution :Nitro compounds are not explosive but STABLE compound.
Discussion
5222.

Which of the following is a sedative

Answer»

METALDEHYDE
PARAFORMALDEHYDE
ACETADEHYDE
PARALDEHYDE

ANSWER :D
Discussion
5223.

Which of the following compounds are named correctly ?

Answer»

`(CH_(3))_(2) CHCH_(2) CH_(2) `CHO
(5 - methly - I - HEXANAL)
`(CH_(3))_(2) "CHCH"_(2) C equiv `C - COOH
(5 - methly - 2- hexyonic acid )
`CH_(3) CH_(2) CH_(2) CH(CH_(3))`COOH
(2 - methylhexanoic acid )
`CH_(3) CH_(2) CH equiv CH - COCH_(3)`
( 3 - hexen - 5- one )

SOLUTION :(a,b,c)
Discussion
5224.

Which one of the following is used in making automobiles and foot wear?

Answer»

Buna-S
Buna-N
natural RUBBER
neoprene

Solution : Buna-S
Discussion
5225.

Which of the following compounds will not show mutarotation ?

Answer»

`ALPHA` -D (+) GLUCOPYRANOSE
`BETA` -D (+) glucopyranose
Methly-`alpha`-D-glucopyranoside
`beta` - D(+) galacopyranose

Solution :N//A
Discussion
5226.

Which is the molecule that possesses pentagonal pyramid structure?

Answer»

`ClF_(5)`
`BrF_(5)`
`IF_(5)`
`IF_(7)`

ANSWER :D
Discussion
5227.

Which of the following is artificialsilk ?

Answer»

VISCOSE RAYON
Nylon-6
Terylene
Nylon -66

ANSWER :A
Discussion
5228.

Which of the following haloalkanes have low boiling point ? Give reason. (a) CH_(3)CH_(2)CH_(2)CH_(2)Br (b) {:(CH_(3)CH_(2)CHCH_(3)),("|"),(""Br):} (c ) {:(""CH_(3)),("|"),(H_(3)C-C-CH_(3)),("|"),(""Br):}

Answer»

Solution :ISOMERIC haloalkanes 'C' has LOW boiling. Increase in branching decreases the boiling point.
Discussion
5229.

What fraction (n/N) of the lattice sites are vacant at 298 K for a crystal in which the energy required to make a defect is 1 eV.(1 eV = 1.602 xx 10^(-19) J)

Answer»

Solution :We have,
`n/N =e^(-(E_(0)/(KT))`
`ln n/N = -E_(v)/(kT)`
or `logn/N = -E_(v)/(2.303kT) = -(1.602 xx 10^(-19))/(2.303 xx (8.314//6.022 xx 10^(23)) xx 298)`
On solving, `n/N = 1.24 xx 10^(-17)`
Discussion
5230.

Write the equations involved in the preparation of nitric acid by Ostwalld's process by maintaining the reaction conditions.

Answer»

SOLUTION :`4NH_3+5O_2overset(Pt" or "RH)UNDERSET(500K" & "9bar)to4NO+6H_2O`
`2NO+O_2to2NO_2`
`3NO_2+H_2Oto2NHO_3+NO`
Discussion
5231.

Which of the following are peroxoacids of sulphur?

Answer»

`H_(2)SO_(5) and H_(2)S_(2)O_(8)`
`H_(2)SO_(5) and H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(7) and H_(2)S_(2)O_(8)`
`H_(2)S_(2)O_(6) and H_(2)S_(2)O_(7)`

Solution :`H_(2)SO_(5)` and `H_(2)S_(2)O_(8)` have peroxide linkages
`HO-O-overset(O)overset(||)underset(O)underset(||)S-OH""HO-overset(O)overset(||)underset(O)underset(||)S-O-O-overset(O)overset(||)underset(O)underset(||)S-OH`
Discussion
5232.

When aqueous HI reacts with methoxyethane, methyl iodide and ethanol are formed, but when aqueous HI reacts with 2-methoxy-2-methylpropane, a mixture of methanol and t-butyl iodide is formed. Explain ?

Answer»

SOLUTION :`HI+underset("Methoxyethane")(CH_(3)-O-C_(2)H_(5))rarrunderset("Methyl iodide")(CH_(3)I)+underset("Ethanol")(CH_(3)CH_(2))OH`
In this case, the reaction follows `S_(N^(1))` path `I^(-)` ion (nucleophile ) attacks protonated ETHER from the less stearically hindere SIDE containing `CH_(3)` group

In the second case, the reaction proced as follows : `HI+CH_(3)O-underset(2-"Methoxy-2-methylpropane")underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)rarrCH_(3)OH +I- underset("t-butyliodide")underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)`
The reaction followes `S_(N^(1))` path. protonated ether INITIALLY formed cleaves to give methanol and a tertiary carbocation in s slow step. The carbocation reacts with `I^(-)` ion to from butyl iodide.
Discussion
5233.

Vapour density of PCl_(5) is 104.16 but when heated at 230^(@)C its vapour density is reduced to 62. The degree of dissociation of PCl_(5) at this temperature will be

Answer»

`6.8%`
`68%`
`46%`
`64%`

Solution :`PCl_(5)iffPCl_(3)+Cl_(2)`
`{:("INITIAL",c,0,0),("Al EQM.",c(1-alpha),calpha,calpha):}`
Total MOLES at eq = `c(1-alpha)+calpha+calpha=c(1+alpha)`
For a reaction at equilibrium, vapour density is inversely proportional to the number of moles, therefore,
`("Total moles at eq.")/("Initial total moles")=("Vapour density initial")/("Vapour density at eq.")`
or `(c(1+alpha))/(c)=(D)/(d),or1+alpha=(D)/(d),alpha=(D)/(d)-1`
`alpha=(D-d)/(d)=(104.16-62)/(62)=0.68=68%`
Discussion
5234.

The standard oxidation potentials of the electrodes Ag//Ag^(+), Sn//Sn^(2+), Ca//Ca^(2+), Pb//Pb^(2+) 0.8, 1.36, 2.86 and 10.12V respectively. The most powerful oxidizing agent among these metals is

Answer»

Pb
Ca
Sn
Ag

Answer :D
Discussion
5235.

The volume of 0.0168 mol of O_(2) obtained by decomposition of KClO_(4) and collected by displacementof water is 428 mL at a presure of 754 mm Hg at 25^(@)C.The pressure of water vapour at 25^(@)C

Answer»

18 mm Hg
20 mm Hg
22 mm Hg
24 mm Hg

Solution :Pressure of DRY GAS `P=nRT//V`
`=(0.0168xx0.0821xx1000xx760xx298)/428=730mm`
Pressure of moist gas =754mm
HENCE pressure of water VAPOUR `=754-730=24mm`
Discussion
5236.

Which of the following cannot ionise

Answer»

`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(NH_(3))_(4)Cl_(2)]Cl`
`[Co(NH_(3))_(5)Cl_(3)]Cl_(2)`
`[Co(NH_(3))_(6)]Cl_(2)`

Solution :Homoleptic COMPLEXES do not IONIZE.
Discussion
5237.

What is appropriate reagent to carry out above synthesis ,i.e., A , B , C respectively are :

Answer»

`Br_(2)//H^(+) , LiAlH_(4) , H^(o+)`
`Br_(2)//H^(o+) , NaBH_(4), HO^(-)`
`NBS , AlCl_(3) , HO^(-)`
`Br_(2)//HO^(-) , BF_(3), HO^(-)`

Solution :(B)
Discussion
5238.

What is the relationship between observed colour of the complex and the wavelength of light absorbed by the complex ?

Answer»

Solution :When white light falls on the complex, some part of it is absorbed. Greater the CFSE, greater is the ENERGY absorbed or shorter is the WAVELENGTH absorbed `(E=(he)/(LAMBDA))`. The OBSERVED colour is the COMPLEMENTARY colour of the colour absorbed.
Discussion
5239.

What is the effect of increase of pressure on the solubility of a gas in liquid ?

Answer»

SOLUTION :SOLUBILITY INCREASE
Discussion
5240.

Which Polymer has PDI value is equal to I ?

Answer»

Nylon-6 `RARR` Caprolactum
Starch
Bakeline
Valcanized rubber

Answer :B
Discussion
5241.

Westron is:

Answer»

`CHCl=CHCl`
`CHCl_2−CHCl_2`
`CH_2Cl-CH_2Cl`
None

Answer :B
Discussion
5242.

Which of the following statements is/are correct'when a mixture of NaCl and K_(2)Cr_(2)O_(7), is gently warmed with conc. H_(2)SO_(4)

Answer»

A DEEP RED vapour is EVOLVED.
The vapour when passed into NaOH solution GIVES a yellow solution of Na Cros.
Chlorine gas is evolved.
Chiomyl chloride is formed.

Answer :A::B::D
Discussion
5243.

Which of the following statements is (are) correct?

Answer»

The ratio of the AVERAGE speed to the rms speed is independent of the temperature
The square of the mean speed of the molecules is EQUAL to the mean squared speed at a certain temperature
Mean kinetic energy of the gas molecules at any given temperature is independent of the mean speed
The difference between rms speed and average speed at ay temperature for DIFFERENT GASES diminishes as larger and yet larger MOLAR masses are considered

Answer :A::C::D
Discussion
5244.

Which one of the following given an acid whenpassed through cation exchange resin(RSO_(3)H) ?

Answer»

`K_(4)[Fe(CN)_(6)]`
`K_(3)[AL(C_(2)O_(4))_(3)]`
`[CO(NH_(3))_(6)]Cl_(3)`
`[Cr(CO)_(6)]`

SOLUTION :C is a cationic complex . Others sare anionic complexes .
Discussion
5245.

The rose odour from an ester is formed by the action of HCOOH on :

Answer»

PINE oil
Olive oil
Geraniol
Turpentine oil

Answer :C
Discussion
5246.

Write down the IUPAC name of the following complex: [Cr(NH_(3))_(2)Cl_(2)(en)]Cl(en=ethylenediamine)

Answer»

Solution :`[CR(NH_(3))_(2)Cl_(2)(EN)]CL`
Diamminedichlorido( ethane-1, 2-diammine)chromium(III) chloride
Discussion
5247.

Transition state.

Answer»

Solution :It is the highest energy state in the course of a reaction, FORMED by the reacting species in which SIMULTANEOUS BOND BREAKING and bond formation TAKES place.
Discussion
5248.

Which of the following amines cannot be prepared by Gabriel phthalimide reaction?

Answer»

BENZYLAMINE
Aniline
Ethylamine
Methalylamine

Answer :B
Discussion
5249.

Write the names of monomers of the following polymers : -[-CH_(2)-overset(Cl)overset(|)(C)=CH-CH_(2)-]-_(n)

Answer»

SOLUTION :CHLOROPRENE (2-chloro-1, 3-butadiene)
Discussion
5250.

Two electrolytic cells containing silver nitrate solution and copper sulphate solution are connected in series. A steady current of 2.5 amp was passed through them till 1.078 g of Ag were deposited. How long did the current flow ? What weight of copper will be deposited ? (Ag = 107.8 u, Cu = 63.5 u)

Answer»

Solution :`w=zxxixxt`
`t=(w)/(zxxi)`
`t=(1.078xx1xx96500)/(107.8xx2.5)="386 SECONDS"`
`Cu^(2+)+2E^(-)rarrCu`
`w=(63.5)/(2xx96500)xx2.5xx386="0.3175 gram"`
Discussion