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10001.

Which alkyne will give 3-Ethyl heptane on catalytic hydrogenation.

Answer»




SOLUTION :N//A
Discussion
10002.

Which statement is/are correct ?

Answer»

`C_(2)H_(5)Br` reacts with alcoholicKOH to form` C_(2)H_(5)OH`
`C_(2)H_(5)OH` whentreatedwith metallicsodium givesethane.
`C_(2)H_(5)Br` whentreatedwith sodium ethoxideformsdiethyl ether.
`C_(2)H_(5)Br` withAgCN formsethyl CYANIDE.

Solution :`C_(2)H_(5) Br + NaOC_(2)H_(5) to UNDERSET("Diethyl ether")(C_(2)H_(5)) -O-C_(2)H_(5) + NaBr`
Discussion
10003.

which of the followingstatementis truefor theelectrochemical daniellcell

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electronsflowfromcopperelectrode tozincelectrode
currentflowsfrom ZINC electrodeto copper ELECTRODE
caationmove towards copperelectrode
cations movetoward zincelectrode

Solution :In Daniell cell followingreactionoccurs
`ZN+Cu^(2+) rarr Zn^(2+) +Cu`
At cathode `Cu^(2+) rarr Zn^(2+) +cu`
At anode `Zn rarr Zn^(2+) +2e^(-)`
Electrons moves from anode (Zn) to cathode(Cu) andelectricity flowsfrom Cu to Zn herecation move toward cathode copper electrode
Discussion
10004.

When chlorobenzene is treated with NH_3 in presence of Cu_2O in xylene at 570K, the product obtained is :

Answer»

Benzylamine
Aniline
Schiff's base
Diazonium salt

Answer :B
Discussion
10005.

Which of the following gas will have highest rate of diffusion

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

Solution :m.wtof `NH_(3)=17,m.wt.` of `N_(2)=28`
m.wt. of `CO-(2)=44, m.wt.` of `O_(2)=32`
because `NH_(3)`is lightest gas out of these gases
`[ r PROP (1)/(sqrt("MOLECULAR WEIGHT"))]`
Discussion
10006.

Which of the following is 3^(@) nitroalkane

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ANSWER :C
Discussion
10007.

Which has maximum paramagnetic nature?

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`[CU(H_(2)O)_(4)]^(2+)`
`[Cu(NH_(3))_(4)]^(2+)`
`[Mn(H_(2)O)_(6)]^(2+)`
`[Fe(CN)_(6)]^(4-)`

Solution :`[Mn(H_(2)O)_(6)]^(2+) implies d^(5)- t_(2g)^(1,1,1)eg^(1,1)`
Discussion
10008.

What is true about compound (I)

Answer»

It has an acetal structure
It has tertiary HYDROXY group
It has a HEMIACETAL structure
It's degree of UNSATURATION is TWO

Solution :
Discussion
10009.

What is 'Glycerose'? How is it prepared from glycerol?

Answer»

Solution :OXIDATION of glycerol with `Br_(2)//H_(2)O` (or) NAOBR (or) Fenton reagent `(FeSO_(4) + H_(2)O_(2))` gives a mixture of glyceraldehyde and dihydroxy acetone (This method is named as glycerose).
Discussion
10010.

Which of the following industrial chemicals is produced in the greatest amount annually ?

Answer»

`HNO_(3)`
`H_(3)PO_(4)`
`H_(2)`
`H_(2)SO_(4)`

ANSWER :D
Discussion
10011.

Which of the following molecules has axis of symmetry and a coaxial plane of symmetry

Answer»




SOLUTION :
Discussion
10012.

Which of the followingg statement(s) is/are false?

Answer»

In `[PtCl_(2)(NH_(3))_(4)]^(2+)` complex ion, the cis-form is optically active, while trans-form is optically inactive
In `[Fe(C_(20O_(4))_(3)]^(3-)`, GEOMETRICAL isomerism does not exist, while optical isomerism exist
In `[Mabcd]^(N+-)` tetrahedral complexes, optical isomerism cannot be observed
In `[Mabcd]^(n+-)` square planar complex, optical isomerism can be observed

Solution :`[PtCl_(2)(NH_(3))_(4)]^(2+)implies` both cis and trans forms are optically inacctive
(b)
`implies`Due to asymmetrical configuration, it exhibits optical isomerism.
(c)
`implies`Due to PLANE of symmetry does not EXHIBIT optical isomerism, but exhibits geometrical isomerism.
(d)
`implies`Tetrahedral complex, asymmetric configuration, hence exhibits optical isomerism.
Discussion
10013.

What is unit cell ?

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Solution :The smallest CHARACTERISTIC repeating PORTION of the ciystal lattice is CALLED uit CELL.
Discussion
10014.

Water is a non-electrolyte but conducts electricity on dissolving a small amount of :

Answer»

`O_2`
Sugar
Acetone
NaCl

Answer :D
Discussion
10015.

Treatment of propionaldehyde with dil NaOH gives :

Answer»

`CH_3CH_2COOH_2CH_2CH_3`
`CH_3CH_2CHOHCH_2CH_2CHO`
`CH_3CH_2CHOHCH(CH_3)CHO`
`CH_3CH_2COCH_2CH_2CHO`

ANSWER :C
Discussion
10016.

Upon mixing 45.0 mL of 0.25 M lead nitrate solution with 25.0 mL of 0.10 M chromic sulphate solution, precipitation of lead sulphate takes place. How many moles of lead sulphate are formed? Also calculate the molar concentrations of species left behind in the final solution. Assume that lead sulphate is completely insoluble.

Answer»

SOLUTION :Apply the concept of limiting reagent
`PbSO_4 = 0.0075` mole
`[PB^(2+)] = 0.05357 M, [NO_3] = 0.3214M`
`[Cr^(3+)] = 0.0714M`
Discussion
10017.

Which of the following statenments are correct for cis- 1,2-dibromocyclopentane?

Answer»

It CONTAINS TWO chiral centers, but is OPTICALLY inactive.
It contains no chiral centres.
It contains two chiral centers and is optically active.
It is a meso COMPOUND.

Solution :(a,d)
Discussion
10018.

The segment of a DNA molecule which codes for a specific protein is called :

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GENETIC code
Hormone
A gene
Muta rotation.

Answer :C
Discussion
10019.

Which pair of element cannot form an alloy :

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ZN , Hg
Fe , Hg
Fe , C
Hg , Na

Answer :B
Discussion
10020.

The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called :

Answer»

CRITICAL temperature
Boyle's temperature
inversion temperature
reduced temperature

Answer :B
Discussion
10021.

Which substance is added during vulcanization to increase the rate of vulcanization process ?

Answer»

TIO
`TiO_(2)`
ZNO
`CrO_(2)`

SOLUTION :Zno
Discussion
10022.

Which of the following has lowest boiling point

Answer»

HF
HCl
HBr
HI

ANSWER :B
Discussion
10023.

Which of the following has highest melting point?

Answer»

NACL
NABR
NAF
NaI

Answer :C
Discussion
10024.

Which one of the following can penetrate through dense fog?

Answer»

`He`
`NE`
`KR`
`RN`

SOLUTION :`Kr`
Discussion
10025.

Thomas slag is:

Answer»

CALCIUM silicate
Calcium phosphate
tetracalcium phosphate
calcium AMMONIUM phosphate

Answer :C
Discussion
10026.

Two solutions A and B have same mole fractions of the solute. If 1 dm^(3) of A is mixed with 2 dm^(3) of B, the mole fraction of the solute in the mixture would

Answer»

decrease
increase
ramain unchanged
change

Solution :As the TWO solutions have same MOLE fractions the RATIO of moles of SOLUTE to total moles (i.e.mole fraction) would remain same even after mixing.
Discussion
10027.

Which of the following acid possesses Zwitter ion ?

Answer»

PICRIC ACID
SALICYLIC acid
Sulphanilic acid
Adipic acid

Solution :Sulphanilic acid
Discussion
10028.

Which of the following is formed when oxalic acid is dehydrated by conc. H_2SO_4?

Answer»

`CO+CO_2`
`CO`
`CO_2`
NONE of these

Answer :A
Discussion
10029.

Which of the following on reaction with acetylene (Ch-=CH) produce gas(es) ?

Answer»

`(I), (II)`, and `(III)`
`(I), (II)`, and `(IV)`
`(II), (III)`, and `(IV)`
`(I), (III)`, and `(IV)`

Solution :I.
II. `HC -= CH + OVERSET(o-)(N)H_(2) rarr HC -= C^(o-) + NH_(3) ("Gas")`
III.`HC -= CH + overset(o-)(C)H_(3) rarr HC -= C^(o-) + CH_(4) ("Gas")`
IV. `HC -= CH + overset(o-)(O)H rarr HC -= C^(o-) + H_(2)O ("LIQUID")`
Discussion
10030.

What are the factors affecting adsorption?

Answer»

Solution :The magnitude of gaseous adsorption depends upon the following factors:
(i) Temperature (ii) PRESSURE (iii) Nature of the GAS and (IV) Nature of the adsorbent.
Discussion
10031.

(X)+K_2CO_3 +Air (Y) overset(H^+)to(Z) Purple : Which of the following is correct ?

Answer»

X=BLACK , `MnO_2`, Y=Blue , `K_2CrO_4` , Z=`KMnO_4`
X=GREEN , `Cr_2O_3` , Y=Yellow , `K_2CrO_4` , Z = `K_2Cr_2O_7`
X=black , `MnO_2` , Y = green , `K_2MnO_4` , Z = `KMnO_4`
X =black , `Bi_2O_3` , Y = COLOURLESS `KBiO_2 `, Z = `KBiO_3`

Answer :C
Discussion
10032.

Which of the following is peroxide ion?

Answer»

`O_(2^(-))`
`O^(-)`
`O_(2)^(2-)`
`O_(3)^(2-)`

ANSWER :C
Discussion
10033.

When para-bromotole istreated withNaNH_(2) in etherthe bromineis lost andmixture of paraandmeta CH_(3)C_(6)H_(4)NH_(2) product is obtained. What is kind of intermediate wouldaccount for this ?

Answer»

ACHARGE delocalised anion formed bynucleophilic addition of`NH_(2)^(ө)` to thebenzene ring .
A charge delocalisedanion formedbyabstractionof methyl proton by thebase `overset(ө) NH_(2)`.
An arylcationfromedby LOSSOF bromide ION .
A benzene SPECIES formedby elimination of HBr.

Answer :D
Discussion
10034.

Watergas is a mixtureof

Answer»

`CO_(2)` and `H_(2)O`
`CO` and `H_(2)O`
`CO` and `H_(2)`
`CO` and `N_(2)`

ANSWER :B
Discussion
10035.

What is meant by chemisorption?

Answer»

SOLUTION :When the FORCES of ATTRACTION between adsorbate particles and adsorbent are almost of the same STRENGTH as CHEMICAL bonds, the adsorption is called chemical adsorption or chemisorption.
Discussion
10036.

What is pH1 M CH_(3)COOHsolution ? To what volumemust onelitre of this solution be diluted so that the pH of resultingso that the pH of resultingsolution will betwicethe orignalvalue . Given :K_(a) = 1.8 xx10^(-5)

Answer»

Solution :`{:(""H_(3)C COOH" "H_(2)O" "hArr" " H_(3)C COO^(-)" +"H_(3)O^(+)),("Initial1M00"),(""-xM""xM""xM),("Final "bar(""(1-x)M""x""x"")):}`
`K_(a) = (x^(2))/(1-x)approx(x^(2))/1 :. x = sqrt(K_(a)) = 4.2xx10^(-3) = [ H_(3)O^(+)] `
`PH = - log [H_(3)O^(+)] = - log { 4.2 xx10^(-3)} = 3 - 4.2 = 2.37 `
Now , let 1 L M AcOH solutionbe diluted to V to doublethepH and the conc. of dilutedsolution be C.
New`pH = 2 XX OldpH = 2 xx 2.37 = 4.74 `
` pH = - log [H_(3)O^(+)] = 4.74`
`pH = -log [H_(3)O^(+)]= 4.74 `
` :. [H_(3)O^(+)]= 1.8 xx10^(-5)`
`{:(""H_(3)C COOH+H_(2)O hArr H_(3)C COO^(-)""+ ""H_(3)O^(+)),("InitialC00"),(""ul(""-1.8xx10^(-5) "" 1.8xx10^(-5)""1.8xx10^(-5))),("Final" C-1.8xx10^(-5)""1.8xx10^(-5)""1.8xx10^(-5)):}`
`K_(a)= ([CH_(3)COO^(-)]xx[H_(3)O^(+)])/([CH_(3)COOH])`
` 1.8 xx 10^(-5) = (1.8 xx10^(-5)xx1.8 xx10^(-5))/(C-1.8xx10^(-5))`
` :. C = 3.6 xx10^(-5) L `
On dilution ,
`M_(1)V_(1) = M_(2)V_(2)`
` 1 Mxx 1 L= 3.6 xx10^(-5) L xx V_(2)`
` :. V_(2) = 2.78 xx 10^(4) L `
Discussion
10037.

Which polymer is used to make pipes ?

Answer»

POLYSTYRENE
NYLON
POLYTHENE
PVC

SOLUTION :PVC
Discussion
10038.

What is smoke screen ?

Answer»

`NH_4Cl`
`SO_2`
`P_2O_5`
HCl

Answer :C
Discussion
10039.

Which amino acid has imidazole ring

Answer»

alanine
Leucine
TYROSINE
Histidine

SOLUTION :Histidine is the unique acid in the sense that it CONTAINS imidazole RING.
Discussion
10040.

Which one is a homopolymer ?

Answer»

TERYLENE
SBR
POLYTHENE
NYLON

SOLUTION :Polythene
Discussion
10041.

Which of the following is/are correct for an ideal binary solution of two volatile liquids (eg. Benzene and toluene) ?

Answer»

Its vapour is ALWAYS richer in the more volatile component ( compared to the LIQUID )
The liquid will gradually become richer in the less volatile component if such as mixture is BOILED (distilled)
The `p_T` (ie. The total pressure) above the solution will be the SUM of the vapour pressures of the two pure components
The boiling point of the solution will be less than the boiling point of the two components

Solution :`(X'_A)/(X'_B)=(P_A^@X_A)/(P_B^@X_B)`
`(X'_A)/(X'_B)GT X_A/X_B` (If `P_A^(@) gt P_B^(@)`)
(B)If `P_A^@` is more, more A will evaporate more and B will stay back in the solution.
(C )`P_T=P_A^(@)X_A+P_b^@ X_BneP_A^@+P_B^@`
(D)If `P_A^@gt P_B^@`.Then `P_A^@ gt P_T gt P_B^@`
`P_A^@ gt P_A^@X_A+P_B^@X_BgtP_B^@`.Hence boiling point of solution is more than A but less than B.
Discussion
10042.

Which of the following compounds is most reactive towards nucleophilic addition reactions ?

Answer»

`CH_(3)-overset(O)overset("||")C-CH_(3)`
`CH_(3)-overset(O)overset("||")C-H`

Solution :Aldehydes are generally more reactive than ketones in NUCLEOPHILIC addition reactions due to STERIC and electronic reasons. Benzaldehyde is less reactive than ETHANAL as the POLARITY of the carbonyl group is reduced in benzaldehyde due to RESONANCE as shown below :
Discussion
10043.

Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most

Answer»

LOW TEMPERATURE and HIGH PRESSURE
High temperature and low pressure
High temperature and low pressure
Low temperature and low pressure

Answer :A
Discussion
10044.

Two moles of an ideal gas (C_(v)=5/2R) was compressed adiabatically against constant pressure of 2 atm. Which was initially at 350 K and 1 atm pressure. The work involve in the process is equal to

Answer»

250 R
300 R
400 R
500 R

Answer :D
Discussion
10045.

The second electron gain enthalpy of oxygen is

Answer»

`-140.9kJ"mol"^(-1)`
`-200.7kJ"mol"^(-1)`
`+780kJ"mol"^(-1)`
0

Solution :SECOND ELECTRON gain ENTHALPY is positive because energy is needed to add electron to negatively chargedion.
Discussion
10046.

Which studying the decomposition of gaseous N_2O_5, it is observed that a plot of logarithm of its partial pressure versus time is linear. The kinetic parameter obtained from this observation is

Answer»

specific reaction rate
reaction rate
ENERGY of ACTIVATION
molecularity

SOLUTION :As it is a reaction of 1st order ,
`k = (2.303)/(t) "log" ([A]_(0))/([A]) ` , i.e., ` k = (2.303)/(t) "log" (p_(N_(2)O_(5))^(@))/(p_(N_(2)O_(5)))`
or `(kt)/(2.303) = log p_(N_(2)O_(5))^(@) =- (k)/(2.303) t + log p_(N_(2) O_(5))^(@)`
From slope , k can be calculated .
Discussion
10047.

X+H_2SO_4 to Y (a colourless gas with pungent smell) Y+K_2 Cr_2O_7 +H_2SO_4to Green solution

Answer»

 `X is SO_(3)^(2-)`
`X is CO_(3)^(2-)`
Y is `H_2S`
Y is `SO_2`

ANSWER :A::D
Discussion
10048.

What causes the disease sickle cell anaemia ?

Answer»

SOLUTION :Defective HAEMOGLOBIN which is product DUE to REPLACEMENT of one amino acid ,i.e., glutamic acid glutamic acid by valine.
Discussion
10049.

Which of the following mixtures can be regarded as buffer ?

Answer»

500 ml 0.2( M) `CH_(3)COOH +` 1000 ml 0.02 ( M ) NaOH
500 ml 0.2( M) `CH_(3)COOH +` 300 ml 0.02 ( M ) NaOH
500 ml 0.2( M) `CH_(3)COOH +` 500 ml 0.02 ( M ) NaOH
500 ml 0.2( M) `CH_(3)COOH +` 500 ml 0.02 ( M ) `NH_(4)OH`

Answer :B,D
Discussion
10050.

Which of the following in an emulsion?

Answer»

BUTTER 
HAIR CREAM 
MILK 
Cloud 

ANSWER :D
Discussion