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9551.

The weakest Lewis acid is :

Answer»

`BF_3`
`BCl_3`
`BBr_3`
`BI_3`

ANSWER :A
Discussion
9552.

When methane is made to react with a halogen (X_2), halides are formed, the order of reactivity is:

Answer»

`F_2gtCI_2gtBr_2gtI_2`
`Cl_2gtF_2gtBr_2gtI_2`
`I_2gtBr_2gtCl_2gtF_2`
`CI_2gt F_2gt Br_2gt I_2`

ANSWER :A
Discussion
9553.

The values of observed and normal molar masses of acetic acid are 118 and 60 respectively. The Van't Hoff factor is

Answer»

1.97
0.51
0.9
1.6

Solution :`i=(118)/(60)=1.97`.
Discussion
9554.

Write the structures of all isomers having molecular fromula, C_(7)H_(7)Cl and containing a benzene ring. Which isomeric compounds contain a much weaker C-Cl bond and why?

Answer»

Solution :
In structrues,I , II and III, Cl atoms are attached with benzene ring. HENCE the LONE pairs of electrons of a Cl-atoms are in conjugation with `pi`- ELECTORN clouds of benzene ring. Thus, C-Cl bonds of I,II and III get partially double bond CHARCATER. But, in structure IV, Cl atom is attached with side chain C atom for which its lone pairs of electrons cannot take part in conjugation with `pi`-electron clouds of benzene ring. Hence, C-Cl bond of IV has weaker C-Cl bond.
Discussion
9555.

Which hydrocarbon reacts with sodium and liquid NH_3 ?

Answer»

`CH_3-CH_2-C-=CH`
`CH_3-C-=C-CH_3`
`CH_3-CH=CH-CH_3`
`CH_3-CH_2-CH=CH_2`

ANSWER :B
Discussion
9556.

Which of the following reaction is exothermic ?

Answer»

`CaCO_3rarrCaO+CO_2`
`Fe+SrarrFeS`
`NaOH+HCIrarrNaCI+H_2O`
`CH_4+2O_2rarrCO_2+2H_2O`

ANSWER :B
Discussion
9557.

What is the % of iron in pyrophoric alloy?

Answer»

0.2
0.5
0.95
0.05

Answer :D
Discussion
9558.

The root mean square speeds at STP for the gases H_(2). N_(2). O_(2) and HBr are in the order :

Answer»

`H_(2) LT N_(2) lt O_(2) lt HBR`
`HBr lt O_(2) lt N_(2) lt H_(2)`
`H_(2) lt N_(2) = O_(2)lt HBr`
`HBr lt O_(2) lt H_(2) lt N_(2)`

Answer :B
Discussion
9559.

Which of the following compounds undergoesnucleophilic substance reaction most easily?

Answer»




Solution :In `S_(n)` AR reactions, a carbanion is formed as an intermediate, so any substituent that increase the stability of carbanion and HENCE the transition STATE leading to its formation will enhance the `S_(n)` Ar reactions. To compare the rates of substitution in chlorobenzene, chlorobenzene having electron-withdrawing group, and chlorobenzene having electron-releasing group, we compare the structures carbanion (I) (from chlorobenzene). II (from chlorobenzene containing electron-withdrawing group) and III (from chlorobenzene containing electron-releasing group).
(i)
(ii)
G-withdraws electrons, neutralises (diperses) -ve charge of the ring, stabilities carbanion, facilitates, `S_(N)` reaction (activation effect)
(iii)
G-releases electrons, intensifies -ve charge, destabilizes carbanion, retards `S_(N)` reaction (deactivation)
`NO_(2)` is ACTIVATING group and `CH_(3) and OCH_(3)` are deactiveting group towards necluphilic aromatic substitution reactions.
Hence, the correct order of nucleophilic substitution reactions
Discussion
9560.

What is the equation form of Langmuir adsorption isotherm undre high pressure?

Answer»

It is VALID for chemisorption
`LN.(X)/(m)=-(DELTAH^(@))/(RT)+(DeltaS^(@))/(R )`\
`(X)/(m)=(a)/(b)`
At very high pressure rate of adsorption `GT` rate of desorption

Answer :D
Discussion
9561.

Wurtz-Fitting reaction is used to prepare

Answer»

ALKYL benzene
higher ALKANE
DIPHENYL
phyenyl benzene

Answer :A
Discussion
9562.

Which of the following ion has maximum unpaired electron?

Answer»

`FE^(+2)`
`CR^(+3)`
`Fe^(+3)`
`Co^(+2)`

Answer :C
Discussion
9563.

Write one difference in the following : Multimolecular colloid and associated colloid.

Answer»

Solution :Multimolecular colloid and ASSOCIATED colloid : On dissolution, a large number of atoms or smaller molecules of a SUBSTANCE AGGREGATE to form species having size in COLLOIDAL range. These species are called multimolecular COLLOIDS.
There are some substances which at lower concentration behave as normal electrolytes but at higher concentration exhibit colloidal behaviour. Such substances are called associated colloids.
Discussion
9564.

Which ordering of compounds is according to decreasing order of the oxidation state of nitrogen ?

Answer»

`HNO_(3), NO, NH_(4)CL, N_(2)`
`HNO_(3), NO, N_(2), NH_(4)Cl`
`HNO_(3), NH_(4)Cl, NO, N_(2)`
`NO, HNO_(3), NH_(4)Cl, N_(2)`

Solution :`Hoverset(+5)(NO)_(3), OVERSET(+2)(NO), overset(0)(N)_(2), overset(-3)(N)H_(4)Cl`
Discussion
9565.

Which of the following is an E isomer ?

Answer»




ANSWER :C
Discussion
9566.

What is the difference between multimolecular and macromolecular colloids ? Give one example of each type. How are associated colloids different from these two types of colloids?

Answer»

Solution :Multimolecular colloids: These are obtained when a large number of atoms or smaller molecules of a substance aggregate to form species having size in the colloidal range. Gold sol and sulphur sol are examples of multimolecular colloids.
MACROMOLECULAR colloids : Macromolecules (polymers) in suitable solvents form solutions in which the macromolecules have the size of colloidal PARTICLES. Examples : Solutions of starch, cellulose etc.
Associated colloids : Associated molecules at low concentration behave as normal STRONG electrolytes but at higher concentrations behave as colloids due to the formation of aggregates. The aggregated particles are called micelles. Surface active agents such as SOAPS belong to this CATEGORY.
Discussion
9567.

Which statement about aspirin is not true?

Answer»

Aspirin belongs to NARCOTIC analgesics
It is effective in relieving pain
It has ANTI blood-clotting action
It is a NEUROLOGICALLY ACTIVE drug.

Answer :A
Discussion
9568.

Which of the following complex entity can show optical activity?

Answer»

TRANS `-[Co(NH_(3))_(4)-Cl_(2)]^(+)`
`[CR(H_(2)O)_(6)]^(3+)`
CIS`-[Co(NH_(3))_(2)(en)_(2)]^(3+)`
trans-`[Co(NH_(3))_(2)(en)_(2))]^(3+)`

Answer :C
Discussion
9569.

Which of the following statement are correct ? (i)Smaller the gold number of lyophilic colloid, larger will be its protective power (ii) Lyophilic sols , in contrast to lyophobic sols are easily coagulated on addition of small amounts of electrolytes. (iii) Ferric chloride solution is used to stopbleeding from a fresh cut because it coagulating the blood (iv)The flocculatin value of arsenious sulphide sol is independent of theanion of the coagulating

Answer»

(i),(II) and (III)
(i) , (iii) and (IV)
(ii) , (iii) and (iv)
(i),(ii) and (iv)

ANSWER :B
Discussion
9570.

Who modified Bohr's theory by introducing elliptical orbits for electron path ?

Answer»

Hund
Thomson
Rutherford
Sommerfeld

Answer :D
Discussion
9571.

Which of the following represent(s) electrophilic substitution ?

Answer»




ANSWER :A::D
Discussion
9572.

Why can aryl halides not be prepared by reaction of phenol with HCl in the presence of ZnCl_(2)?

Answer»

SOLUTION :Due to resonance, C-O bond in phenols has some double bond character but in alcohols, it is a pure SINGLE bond. In other words, C-O bond in phenols is stronger than C-O bond in alcohols and hence difficult to bereak. As a result, phenols do not react WITHHCL in presence of anhydrous `ZnCl_(2)` to form the corresponding ARYL chlorides but alcohols react to form the corresponding ALKYL chlorides.
Discussion
9573.

The vapour pressure of mixture of ethanol and propanol is 290 mm at 300 K temp. If the vapour pressure of propanol is 200 mm at 300 K temp. and the mole fraction of ethanol is 0.6, then what will be the vapour pressure of ethanol at 300 K temp. ?

Answer»

350 MM
300 mm
700 mm
360 mm

Solution :`P=P_(A)^(@).X_(A)+P_(B)^(@).X_(B)`
`290=200xx0.4+P_(B)^(@)xx0.6`
`P_(B)^(@)=350 mm`
Discussion
9574.

Which of the following complexes can exist as diastereoisomers ?

Answer»

`[Cr(NH_(3))_(2)Cl_(4)]^(-)`
`[Co(NH_(3))_(5)Br]^(2+)`
`[FeCl_(2)(NCS)_(2)]^(2-)`
`[PtCl_(2)Br_(2)]^(2-)`

Solution :(a) and (d) can show G.I.
Discussion
9575.

Which of the following statements are correct about solid catalyst ?

Answer»

Same reactants may give different product by using different catalyst. 
Catalyst does not change `DeltaH` of the reaction. 
Catalyst is required in large quantities to CATALYSE reactions. 
Catalytic activity of a solid catalyst does not depend UPON the strength of chemisorption. 

Solution :Catalysts show selectivity. They direct the chemical reactions to YEILD a definite product. The catalyst INCREASES reaction RATES by decreasing activation energy, hence `DeltaH` is constant.
Discussion
9576.

Which of the following salts undergoes anionic hydrolysis ?

Answer»

`CuSO_(4)`
`Na_(2)CO_(3)`
`NH_(4)Cl`
`FeCl_(3)`

SOLUTION :`Na_(2)CO_(3)` undergoesanionic HYDROLYSIS as given below
`CO_(3)^(2-) +HOH hArrH_(2)CO_(3)+2OH^(-)`
Discussion
9577.

Which of the following reaction is of Daniell cell ?

Answer»

`Zn_((S))+2AG^(+)toZn_((AQ))^(2+)+2Ag_((S))`
`Cu_((S))+2Ag_((aq))^(+) to Cu_((aq))^(2+)+2Ag_((S))`
`Zn_((S))+Cu_((aq))^(2+) to Zn_((S))^(2+)+Cu_((S))`
`Zn_((S))+2H_((aq))^(+) to Zn_((aq))^(2+)+H_(2(G))`

Solution :`Zn_((S))+Cu_((aq))^(2+) to Zn_((S))^(2+)+Cu_((S))`
Discussion
9578.

What is the end product of the following sequences of operations :'CaC_2H_2O Adil.H_2SO_4Hg++Bunderset(H_2)overset(Ni)rarrC'

Answer»

METHYL alcohol
Acetaldehyde
`C_2H_5OH`
`C_2H_4`

ANSWER :C
Discussion
9579.

Which of the following anion behaves in a different manner than other on heating with conc. H_(2)SO_(4) ?

Answer»

`CL^(-)`<BR>`I^(-)`
`Br^(-)`
All BEHAVE in a SIMILAR manner

Answer :A
Discussion
9580.

Which of the following reactions give benzophenone

Answer»

`2C_(6)H_(6)+C CI_(4) OVERSET((i)AICI_(3))underset((ii)H_(2)O)RARR`
`C_(6)H_(6)+C_(6)H_(5)COCI overset(AICI_(3))rarr`
`o-CH_(3)C_(6)H_(4)COC_(6)H_(5) overset("heat")rarr`
`o-HOOC-C_(6)H_(4)-COC_(6)H_(5) overset(Cu)underset(260^(@)C)rarr`

Solution :
Discussion
9581.

Which one of the following is a non- steroidal hormone

Answer»

Estradiol
PROSTAGLANDIN
Progesterone
Estrone

Solution :Prostaglandin is non-steriodal HORMONE.
Discussion
9582.

When sodium metal is dissolved in liquid ammonia, a blue solution is formed. The blue colour is due to

Answer»

SOLVATED` NA^+` ions
Solvated electrons
Solvated `NH_2^-`
Solvated protons

Answer :B
Discussion
9583.

Which of the following are not true ?

Answer»

addition of `HgI_(2)` SOLID to aq KI solution INCREASES the B.Pt.
Addition of liter solid `AgNO_(3)` to KCL solution decreases freazing point
Addition of litre solid `NaOH` to HCN solution increases the B.Pt.
0.1M NaCl ffreazes at a LOWER temperature than 0.2 M NaCl solution

Answer :A::B::D
Discussion
9584.

What is difference between an emulsion and a gel?

Answer»

Solution :Emulsion–both dispersed PHASE and dispersion MEDIUM are LIQUID.
Gel–Dispersed phase is liquid while dispersion medium is SOLID.
Discussion
9585.

Which of the following reaction will give 2, 2-dibromopropane ?

Answer»

`CH_(3)-C -= CH + 2HBr RARR`
`CH_(3)CH = CH_(2) + HBr rarr`
`CH_(3)CH = CHBR + HBr rarr`
`HC -= CH + 2HBr rarr`

Solution :`CH_(3)C -= CH overset(HBr)rarr CH_(3) - underset(Br)underset(|)(C) = CH_(2) overset(HBr)rarr underset("2, 2-Dibromopropane")(CH_(3) - underset(Br)underset(|)overset(Br)overset(|)(C) - CH_(3))`
Discussion
9586.

Write Raoult's law for a solution containing (alpha) volatile solute and (b) non-volatile solute.

Answer»

SOLUTION :For ANSWER CONSULT SECTION 5.
Discussion
9587.

What is the geometry of [Cu(H_(2)O)_(4)]^(2+) ?

Answer»

SOLUTION :SQUARE PLANAR
Discussion
9588.

What is phosphorescence?

Answer»

Solution :WHITE (YELLOW) phosphorous glows in the dark due to oxidation which is called PHOSPHORESCENCE.
Discussion
9589.

Which of the following derivatives of benzene would undergo hydrolysis most readily with aq. KOH?

Answer»





Solution :`-NO_(2)` group INCREASES the REACTIVITY in nucleophilic substitution on benzene ring DUE to -R and -I EFFECT.
Discussion
9590.

What are the limitations of Ostwald's dilution law?

Answer»

Solution :Ostwald's dilution LAW is APPLICABLE only for WEAK electrolyte and does not hold GOOD for concentration solution.
Discussion
9591.

Which of the following oxides of nitrogen is notcommon air pollutant

Answer»

`NO_(2)`
`N_(2) O`
`NO`
`N_(2) O_(5)`

ANSWER :D
Discussion
9592.

Which one is more soluble in water ?

Answer»

AgI
AgCI
AgBr
AgF

Answer :B
Discussion
9593.

Which of the following compounds can show geometrical isomerism :(i) Pent-1-ene(ii) 1-chloropropene(iii)2-Methylbut-2-ene(iv) CH_(3)-CH=CH-CH_(3)

Answer»


ANSWER :(II), (iv), (V), (vi), (vii)
Discussion
9594.

What are the oxidation states of phosphorous in the following : (i) H_3PO_3 (ii) PCl_3 (iii) Ca_3P_2 (iv) Na_3PO_4 (v) POF_3?

Answer»

Solution :LET the OXIDATION STATE of P be taken as x. Substitutingthe oxidation STATES of other element we can calculate the oxidation state of P as done below :
(i) `OVERSET(+1)(H_3) overset(x-2)(PO_3) or 3 (+1) + x + 3 (-2) = 0 or x = +3`
(ii) `overset(x)(P) overset(-1)(Cl_3) or x +3 (-1) = 0 or x = +3 `
(iii) `overset(+2)(Ca_3) overset(x)(P_2) or 3 (+2) +2 xx x =0 or x =-3`
(iv) `overset(+1)(Na_3) overset(x)(P)overset(-2)(O_4) or 3 (+1) + x + 4 (-2) =0 or x = +5`
(v) `overset(x)(P) overset(-2)(O)overset(-1)(F_3)` or `x + 1 (-2) + 3(-1) =0 or x = +5` .
Discussion
9595.

Which of the following 0.1 M aqueous solutions will have the lowest freezing point :

Answer»

POTASSIUM sulphate
Sodium chloride
Urea
Glucose

Answer :A
Discussion
9596.

Which of the following is the correct order of stability of the following four distinct conformation of n-butane?

Answer»

Gauche `GT` Staggered `gt` PARTIALLY eclipsed `gt` FULLY eclipsed
Staggered `gt` Gauche `gt` Partially eclipsed `gt` Fully eclipsed
Staggered `gt` partially eclipsed `gt` Gauche `gt` Fully eclipsed
Fully eclipsed `gt` Staggered `gt` Partially eclipsed `gt` Gauche.

Answer :B
Discussion
9597.

What are the products expected in the following reactions? C_(6)H_(5)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)underset("Ether")overset(CH_(2)N_(2))rarr

Answer»

`C_(6)H_(5)overset(OCH_(3))overset(|)C=CH-overset(O)overset(||)C-CH_(3)`
`C_(6)H_(5)overset(O)overset(||)C-CH=overset(OCH_(3))overset(|)C-CH_(3)`

SOLUTION :N//A
Discussion
9598.

Which one of the following contains C_(sp^(2))-OH bond ?

Answer»

tert-butyl alcohol
allyl alcohol
benzyl alcohol
carbolic acid

Answer :A
Discussion
9599.

Which one of the following complex has magnetic moment a 4.899B_(M)?

Answer»

`[Fe(CN)_(6)]^(3-)`
`[Fe(CN)_(4)]^(3-)`
`[CoF_(6)]^(3-)`
`[NI(CO)_(4)]`

Answer :C
Discussion
9600.

Which one of the following is an anionic detergent?

Answer»

n - hexa decyl tri METHYL ammonium CHLORIDE
Penta erythrityl STEARATE
Sodium lauryl SULPHATE
3-hydroxy - 2,2 bis (hydroxy methyl) PROPYL heptonoate

Solution :Sodium lauryl sulphate
Discussion