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15751.

Which of the following ligands would act as flexidentate ligand and ambidentate ligand?

Answer»

`SO_(3)^(2-)`
`NO_(3)^(-)`
`CO_(3)^(2-)`
None of these

Solution :
If it acts as AMBIDENT ligand then S and O dimer SITES and if it acts as bidentate then both O can bind at one time.
Discussion
15752.

Which of the following paramagnetic in nature

Answer»

CARBONIUM ION
FREE radical
Carbene
Nitrene

Answer :B
Discussion
15753.

When H_(2)S reacts with F_(2) the compound formed is

Answer»

`SF_(4)`
`SF_(6)`
`OF_(6)`
`SF_(2)`

Solution :`H_(2)S+4F_(2) to 2HF +SF_(6)`
Discussion
15754.

Which of the following statements are not correct? (i) F^(-) ion concentration above 2 ppm causes brown mottling in teeth. (ii) Excessive F^(-) (over 10 ppm) causes harmful effect to bones and teeth. (iii) Excessive lead in drinking water causes diseasemethemoglobinemia(iv) Deficiency of sulphate in drinking water causeslaxative effect

Answer»

(II) and (iv)
(ii) and (iii)
(ii), (iii) and (iv)
(iii) and (iv)

Solution :For statement (iii), Methemoglobinemia (blue baby syndrome) is CAUSED due to excess of nitrate in drinking water. For statement (iv), Excessive SULPHATE (gt 500 ppm) in drinking water causes LAXATIVE effect, otherwise at moderate levels it is harmless
Discussion
15755.

Which of the following is weakly deactivating atom /group in electrophilic substitution reaction of benzene ?

Answer»

OH
`NO_(2)`
`OCH_(3)`
I

Answer :D
Discussion
15756.

Which of the following contain transition metal ?

Answer»

Vitamin B -12
CHLOROPHYL
Haemoglobin
RNA

ANSWER :A::C
Discussion
15757.

What is relation between G and K?

Answer»

CHAIN isomer
positionalisomer
Homologue
None of these

Solution :N//A
Discussion
15758.

Which of the following will give characteristic colour with FeCl_(3)

Answer»




Solution :`beta`-Ketoaldehyde exists an an ENOL as shown below.

THEREFORE, `beta`-Ketoaldehyde and PHENOL gives characteristic colour with `FeCl_(3)`.
Discussion
15759.

Which of the following is an example of secondary batteries ?

Answer»

MERCURY BUTTON cell
Leclanche cell
Lead storage BATTERY
DANIEL cell

Answer :C
Discussion
15760.

Why are aryl halides less reactivetowards nucleophilic substitution reactions than alkyl halides? How can we enhance the reactivity of aryl halides?

Answer»

Solution :Aryl halides are less reactive towards nucleophilic substitution reaction due to the following reasons
() In haloarenes the lone pair of electron on HALOGEN are in resonance with benzene ring So, C-Clbond acquires partial DOUBLE bond character which strengthen C-Cl bond Therefore, they are less reactive towords nucleophilic substitution reaction.

(i) In haloarenes, the carbon atom attached to halogen is `sp^(2)` hybridised. The `sp^(2)` hybridised carbon is more electronegative than `sp^(3)` hybridised carbon. This `sp^(2)`-hybridised carbon in haloarenes can hold the electron pair of C-X bond more tightly and make this C-CI bond shorter than C-Cl bond of haloalkanes
Since, it is difficult to break a shorter bond than a longer bond, therefore, haloarenes are less reactive than haloarenes
In haloarenes, the phenyl cation will not be stabilised by resonance therefore `S_(N)1` mechanism ruled out
(iv) Because of the repulsion between the nucleaphile and electron rich arenes, aryl halides are less reactive than alkyl halides
The reactivity of aryl halides can be increased by the presence of an electron withdrawing group `(-(NO_(2))` at ortho and para positions. However, no effect on reactivity of haloarenes is observed by the presence of electron withdrawing group at meta-position. Mechanism of the reaction is as depicted with `""^(-)OH` ion.


From the above resonance, it is very CLEAR that electron DENSITY is rich at orto and para positions. So, presence of EWG will fascilitate nucleophilic at ortho and para positions not on meta position.
Discussion
15761.

X' is substance which combines chemically with impurities associated with the ore to form casily fusible mass'Y! Her X and Yare

Answer»

FLUX, SLAG
Slag, flux
GANGUE, slag
REDUCTANT, flux

Answer :A
Discussion
15762.

Which of the following are correct according to Boyle's law ?

Answer»

`((del P)/(del V))_(T)=(K)/(V^(2))`
`((DV)/(dP))_(T)`
`((dV)/(dP))_(T)=-(K)/(P^(2))`
`((dV)/(dP))_(T)=+(K)/(P)`

Solution :`V prop""(1)/(P) RARR V=(K)/(P)`
`therefore ((dV)/(dP))_(T)=-(K)/(P^(2))`
Also, `P=(K)/(V)`
`((dP)/(dV))_(T)=-(K)/(V^(2))`
HENCE, (A) and (C ) are the correct answer.
Discussion
15763.

Which of the following lattices has the highest packing efficiency (i) simple cubic (ii) bodycentred cubic and (iii) hexagonal close-packed lattice ?

Answer»

Solution :(i) Simple CUBIC : 52% PACKING efficiency
(II) Body-centred cubic : 68% packing efficiency
(iii) Hexagonal close packing : 74% packing efficiency.
Hence, Hexagonal close-packed structure is maximum efficient.
Discussion
15764.

Which of the following order is wrong

Answer»

`NH_(3)ltPH_(3)ltAsH_(3)` - acidic nature
`LI^(+)ltNa^(+)ltK^(+)ltCs^(+)`-ionic radius
`Al_(2)O_(3)ltMgOltNa_(2)OltK_(2)O`-BASIC
`LiltBeltBltClt1^(st)` ionisation potential

Answer :D
Discussion
15765.

What is Vinegar? How will you get glacial acetic acid?

Answer»

Solution :(i) Vinegar is 6 to 8% solution of acetic ACID in water.
(ii) Pure acetic acid is CALLED glacial acetic acid. Because it forms ice LIKE crystal when cooled. When aqueous acetic acid is cooled at 289.5 K, acetic acid SOLIDIFIES and forms ice like crystals, where as water remains in liquid state and removed by filtration. This process is repeated to obtain glacial acetic acid.
Discussion
15766.

Whatis themaximumnumberof carbonatomsin theexpectedproductsof theWurtz reaction ? CH_(3)-CH_(2) Brunderset( "products")underset("Na+dryether"darr)andCH_(3)-underset(CH_(3))underset(|)CH-CH_(2)Br

Answer»

8
6
4
2

Answer :A
Discussion
15767.

When 10^(-6) mole of a monobasic strong acid is dissolved in one litre of solvent, the pH of the solution is

Answer»

6
7
less than 6
more than 7

Answer :A
Discussion
15768.

Which of the following parameters are correct for triclinic lattice ?

Answer»

`alpha = BETA = gamma = 90^(@)` and `a = b = C `
`alpha != beta !=gamma!=90^(@)` and `a!=b!=c`
`alpha=gamma=90^(@),beta!=90` and `a!=b!=c`
`alpha=beta=gamma=90^(@)` and `a!=b!=c`

ANSWER :A::B::C::D
Discussion
15769.

Give one test to distinguish between acetaldehyde and acetone.

Answer»

Fehling.s SOLUTION
GRIGNARD REAGENT
Schiff.s reagent
Tollen.s reagent

ANSWER :B
Discussion
15770.

Which of the following solutions will exhibit highest boiling point ?

Answer»

`0.01 M Na_(2)SO_(4(aq))`
`0.01 M KNO_(3(aq))`
`0.015 "M urea"_((aq))`
`0.015"M glucose"_((aq))`

Solution :`Delta T_(b)=i. K_(b).m`
For `0.01 M Na_(2)SO_(4), Delta T_(b)=3xx0.01xx K_(b)`
`[Na_(2)SO_(4)to 2Na^(+)+SO_(4)^(2-), i=3]`
For `0.01M KNO_(3), Delta T_(b)=2xx0.01xx K_(b)`
`[KNO_(3)rarr K^(+)+NO_(3)^(-), i=2]`
For 0.015 M urea, `Delta T_(b)=0.015 xx K_(b)`[Urea is a NON electrolyte]
For 0.015 M glucose,`Delta T_(b)=0.015xxK_(b)` [Glucose is a non - electrolyte].
Discussion
15771.

Whichstatement (s) are correct ? (1) A 3s sub - shell hasa maximum of8 electrons. (2)An elementwith configurationof 1s^(2) 2s^(2)3p^(6)3s^(2) would be in the same group as beryllium. (3) The general electronic configuration of the groupcontaining N_(2) is ns^(2) np^(2). (4) A strontium atom has a filled outer shell if it loses tow electrons.

Answer»

1,2 and 3
1 and 3
2 and 4
Only 4

Solution :(1) Incorrect 3- s -sub - level can have a maximum of 2 electrons.
(2) Correct : It is the electron configurationof MG .
(3) Incorrect : Thecorrect VALENCESHELL configuration of this group is `NS^(2)np^(3)` .
(4) Correct: It is in secondgroupwith onlytwovalenceelectrons.
Discussion
15772.

Which of the following contains only three pairs of electrons ?

Answer»

Carbocation
Carbanion
Free radical
None of these

Answer :A
Discussion
15773.

What are the limitations of Freundich adsorption isotherm?

Answer»

Solution :(i) The FREUNDLICH adsorption isotherm is purely empirical and VALID over a limited pressure RANGE.
ii. The value of constant .k. and .n. also found VARY with temperature. No theoritical explanation were given.
Discussion
15774.

The unit cell with crystallographic dimensions : a =b cancel(=)c, alpha =beta = gamma = 90^(@) is :

Answer»

CUBIC
HEXAGONAL
TETRAGONAL
Orthorhombic

Answer :C
Discussion
15775.

Which one of the following will show the highest pH value?

Answer»

m-nitrophenol
p-nitrophenol
o-nitrophenol
Both (B) and ©

Solution :In case of m-nitropbenol operational effect of NITROGROUP is electTon withdrawing INDUCTIVE effect while incaseof b and C,both -R and -I effect are operational.
Discussion
15776.

Two flasks A and B of equal capacity of volume contain SO_3 and CO gas respectively under similar conditions of temperature and pressure. Then, which of the following statement is true?

Answer»

A has TWICE the number of MOLES as that of B
B has twice the number of moles as that of A
A and B have equal number of moles
B has twice the number of ATOMS as that of A

Answer :C
Discussion
15777.

Which of the following statements is/are true ?

Answer»

`Cu^(2+)` salts form soluble COMPLEX with excess KCN
`Cu^(2+)` salts form soluble complex with aqueous AMMONIA
`Cu^(2+)` salts form soluble complex with KI
A piece of IRON or zinc when PLACE in `Cu^(2+)` salt solution, precipitates copper

Solution :(C ) is incorrect as with KI, `Cu^(2+)` salts form a WHITE precipitate of `Cu_2I_2 and I_2` gas is liberated.
Discussion
15778.

Which of the following statement is/are incorrect ?

Answer»

the end nuclide formed in thorium (4n) series is `""_(81) BI^(200)`
`""_(7) N^(15)` and `""_(8) O^(16)` are isobars .
`""_(20) Ca^(40)` has magic number of protons and magic number of neutrons
The radius (R) of a nuclide of MASS number A is given by the equation `R = R_(0) (A)^(1//3)`

Solution :`""_(83) Bi^(200) implies ` not found in any series
Discussion
15779.

Which of the following factors affect the colligative properties of solution ?

Answer»

Nature of SOLUTE
Nature of solvent
Number of solvent MOLECULES
Number of solute PARTICLES

ANSWER :D
Discussion
15780.

The stability of +1 oxidation state increases in the sequence………………..

Answer»

AlltGaltInltTI
TIltInltGaltAl
InltTIltGaltAl
GaltInltAlltTI

Answer :A
Discussion
15781.

What is the product X in the following reaction ?

Answer»




Solution :`Br^(-)` is better leaving group than `Cl^(-)` HENCE (X) is formed by `S_(N)2` MECHANISM INVOLVING replacement of `Br^(-)` by `OH^(-)`.
Discussion
15782.

Which one of the following elements is most abundant in earth crust ?

Answer»

Aluminium
Silicon
Carbon
Oxygen

Answer :D
Discussion
15783.

Which of the following reactions does not take place during rusting?

Answer»

`H_2CO_3 HARR 2H^(+) + CO_3^(2-)`
`4Fe^(2+) + O_(2(DRY)) to Fe_2O_3`
`4Fe^(2+) + O_2+ 4H_2O to 2Fe_2O_3 + 8H^(+)`
`Fe_2O_3 + xH_2O to Fe_2O_3. xH_2O`

Solution :`Fe^(2+)` ion does not react with dry oxygen
Discussion
15784.

Which is true for a detergent molecule?

Answer»

It has a non-polar ORGANIC part and a polar group
It is not easily biodegraded
It is sodium salt of a FATTY acid
It is a surface active reagent

Solution :DETERGENTS should have polar & non polar ends. It should decrease surface tension , it should be BIODEGRADABLE.
Discussion
15785.

Which curve represents zero order reaction:

Answer»


ANSWER :C
Discussion
15786.

What is the percentage of sulphur used in vulcanization of rubber

Answer»

0.05
0.03
0.3
0.55

Solution :Vulcanization is a PROCESS in which natural rubber is TREATED with 4-5% SULPHUR and certain organic compound which accelerated the reaction between the rubber and sulphur. It introduced sulphur bridge between polymer chains thereby increasing its tensile strength, strength , elasticity and resistance to abrasion.
Discussion
15787.

Which of the following reagent may be used to distinguish between phenol and benzoic acid ?

Answer»

Aqueous `NAOH`
TOLLEN's reagent
Molisch reagent
Neutral `FeCl_(3)`

Solution :Neutral `FeCl_(3)` reacts with phenol and give VIOLET coloured COMPLEX:
Discussion
15788.

Which of the following is a trisaccharide ?

Answer»

Stachyrose
Sucrose
Raffinose
Ribose

Answer :C
Discussion
15789.

What is the significance of Henry'g Law constant K_(H) ?

Answer»

SOLUTION :HIGHER the VALUE of Henry's law constant, `K_(H)`, lower is the solubility of gas in the liquid.
Discussion
15790.

Which of the following is a criteria to calssify drugs ?

Answer»

CHEMICAL stucture
Moleclar TARGETS
DRUG action
All of these .

ANSWER :D
Discussion
15791.

Which of the following metal nitrates give oxides on heating ?

Answer»

Li
MG
Na
CA

Solution : `2LiNO_3overset(DELTA)rarrLi_2O+2NO_2+1/2O_(2),2NaNO_(3)overset(Delta)rarr2NaNO_2+O_2`
`Ca(NO_3)_(2)overset(Delta)rarrCaO+2NO_(2)+1/2O_(2),Mg(NO_3)_2overset(Delta)rarrMgO+2NO_(2)1/2O_2`
Discussion
15792.

Which nitrogen trihalides is least basic

Answer»

`NF_(3)`
`NCl_(3)`
`NBr_(3)`
`NI_(3)`

Solution :
it least basic because of the high electronegativity of 3F atoms. The LONE pair present on nitrogen ATOM is not easily AVAILABLE for donation.
Discussion
15793.

Which contains larger proportion of glycrides of unsaturated fatty acid :

Answer»

Oils
Fast
Both (a) and (B)
NONE

ANSWER :A
Discussion
15794.

When isobutane is treatedwith bromine at 127^(@) C, the product formedis

Answer»

a mixtureof isobutyl bromide and teri - butylbromide .
a mixtureof sec- butylbromideand tert - butyl bromide .
a mixture of isobutylbromide , sec - butyl bromide and tert - butylbromideas the majorproduct .
almost 100 % tert - butyl bromide .

SOLUTION :Bromineis LESS reactive thanchlorineand hencemoreselective , LEADING to the formation of the product CORRESPONDING to `3^(@)` FREE radical, i.e tert- butyl bromide.
Discussion
15795.

Write the IUPAC name of the following compound : CH_(2) = CHCH_(2)Br

Answer»

SOLUTION :`underset("3-Bromoprop -1-ene") (overset(1)CH_(2) = overset(2)CHoverset(3)CH_(2)Br) `
Discussion
15796.

The resistance of 0.15 M solution of an electrolyte is 50Omega. The specific conductance of the solution is 2.4 Sm^(-1). The resistance of 0.5 N solution of the same electrolyte measured using the same conductivity cell is 480Omega. Find the equivalent conductivity of 0.5 N solution of the electrolyte.

Answer»

Solution :Given that
`R_(1)=50 Omega""R_(2)=480Omega`
`kappa_(1)=2.4Sm^(-1) ""kappa_(2)=?`
`N_(1)=0.15N""N_(2)=0.5N`
`wedge=(kappa_(2)(SM^(_1)) times 10^(-3)("gram EQUIVALENT")^(-1)m^(3))/(N)`
`""=(0.25 times 10^(-3)S("gram equivalent")^(-1)m^(2))/(0.5)`
`wedge=5 times 10^(-4)Sm^(2)" gram equivalent"^(-1)`
We know that
`KAPPA="Cell constant"/R`
`therefore kappa_(2)/kappa_(1)=R_(1)/R_(2)`
`kappa_(2)=kappa_(1) times R_(1)/R_(2)`
`""=2.4Sm^(-1) times (50 Omega)/(480 Omega)`
`""=0.25Sm^(-1)`
Discussion
15797.

Two liquids A and B mix to form an ideal binary liquid solution On adding solid solute C to the solution, A starts polymerising into a hexamer soluble solid 'A'_(6) Following zero order kinetics with a rate constant =10^(-1)"moles"//min if initialy 10 moles of A and 20 moles of B were taken to form liquid solution and 5 moles of C were added then answer the following questions based on above information and data given below:[Data: vapour pressure of pure A=100 torr, vapour pressure of pure B=90 torr] The vapour pressure of the solution 1 hr after solid C is added will be given by :

Answer»

`220/3` TORR
`98` torr
`2200/29` torr
`2200/24` torr

Answer :A
Discussion
15798.

Tris (ethylenediamine) cobalt (III) cation, [Co(en)_3]^(3+), can have

Answer»

(a) three stereoisomers, all chiral and optically ACTIVE
(B) two chiral stereoisomers (ENANTIOMERS) and one achiral
(c) three stereisomers, all archiral
(d) two stereoisomers, both achiral

Solution :
Optical isomers (d and c) of `[Co(en)_3]^(3+)`
Optical isomers have mirror images that cannot be SUPERIMPOSED on one another. These are called as enantiomers. The molecules or IONS that cannot be superimposed are called chiral.
Discussion
15799.

Two liquids A and B mix to form an ideal binary liquid solution On adding solid solute C to the solution, A starts polymerising into a hexamer soluble solid 'A'_(6) Following zero order kinetics with a rate constant =10^(-1)"moles"//min if initialy 10 moles of A and 20 moles of B were taken to form liquid solution and 5 moles of C were added then answer the following questions based on above information and data given below:[Data: vapour pressure of pure A=100 torr, vapour pressure of pure B=90 torr] Which of the following statements is incorrect regarding the above process?

Answer»

The vapour pressure will keep on decreasing initially.
The vapour pressure will BECOME CONSTANT 100 min after ADDITION of C.
Two hours after addition of C, the vapour pressure will become 72 torr
Four hours after addition of C, the vapour pressure will BECOMES `67.5` torr.

Answer :C
Discussion
15800.

Which of the following is not a property of aniline

Answer»

It is BASIC in nature
It gives CARBYLAMINE test
It can react with 3 MOLES of alkylhalide
It turns BLUE LITMUS red

Answer :D
Discussion