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401.

Which of the following is Gutta -percha ?

Answer»

`"CIS" CH_2=OVERSET(CH_3)overset(|)C-CH=CH_2`
`"TRANS" CH_2=overset(CH_3)overset(|)C-CH=CH_2`
`"cis" CH_2=overset(CH_3)overset(|)C-CH_2-overset(CH_3)overset(|)C=CH_2`
`"trans" CH_2=overset(CH_3)overset(|)C-CH_2-overset(CH_3)overset(|)C=CH_2`

ANSWER :B
Discussion
402.

Which of the following will give yellow precipitate on shaking with an aqueous solution of NaOH followed by acidification with dil. HNO_(3) and addition of AgNO_(3) solution

Answer»




Solution :Substrate can GIVE `S_(N^(2))` reaction under the prevailing condition. By the way, `I^(-)` is released into the solution Dil. `HNO_(3)` NEUTRALISES excess NaOH. `AgNO_(3)` gives yellow ppt. of AgI.
Discussion
403.

Which of the following statements is // are correct ?

Answer»

The coordination number of each type of ION in CSCL crystal is 8
A metal that crystallizes in bcc structure has coordination number of 12
A unit cell of an ionic crystal SHARES some ot its ions with other unit cells
The length of the unit cell in NaCl is 552 pm `( r_(Na)^(+)`= 95 pm, `r_(Cl)^(-) `= 181 pm )

Answer :A,C,D
Discussion
404.

What amount of BaSO_4will dissolve in 500 mL of aqueous solution? Ksp (BaSO_4) = 1 xx 10^(-10).

Answer»

SOLUTION :`0.0011 G `
Discussion
405.

Write general reaction and its differential rate equaiton & rate law.

Answer»

Solution :General reaction:aA+bB `to` cC +dD
Where a,b,c and d are the STOICHIOMETRIC coefficients of REACTANTS and products
(b)Rate EXPRESSION:Rate `prop[A]^(x)[B]^(y)`……….(ii)
Where,exponents x and y may or may not be equal to the stoichometric coefficients (a and b)of the reactants.Above equation (ii)can also be written as:
Rate =`kl[A]^(x)[B]^(y)`
`therefore -(d[R])/(dt)=k[A]^(x)[B]^(y)` .........(iii)
Whre k is a proportionality constant and is called rate constant.The proportionality constant k of differential rate equation is called rate constant.
(c )Rate law or rate expression:Rate law is the expression in which reaction rate is given in terms of molar CONCENTRATION of reactants with each term reaised to some power,which may or may not be same as the stoichiometric coefficient of the reacting SPECIES in a balanced chemical eqaution.
For example :`2NO_((g))+O_(2(g))to2NO_(2(g))`
The differential form of this rate expression is given as rate =`-(d[R])/(dt)=k[NO_(2)]^(2)[O_(2)]`
Where ,x=2=coefficient of NO
and y=1=coefficent of `O_(2)` (Coefficient of `O_(2)` is not written but it is accepted)
Discussion
406.

Which of the following solvent useful to carry S_N2 reaction ?

Answer»

Acetone
DMF 
DMSO
Any of the above 

ANSWER :D
Discussion
407.

Which one of the following is an antacid?

Answer»

OMEPRAZOLE
RABEPRAZOLE
MILK of MAGNESIA
all the above

Solution :all the above
Discussion
408.

Which metal is used to make alloy steel for armour plates, safes and helmets

Answer»

Al
Mn
Cr
Pb

Solution :Mn used to make ALLOY STEEL for ARMOUR plates, safes and HELMETS.
Discussion
409.

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

Answer»

SOLUTION :This is DUE to partial DOUBLE bond character of C - O bond in phenol.
Discussion
410.

Which of the followingdoes not givesoxygen on heating

Answer»

`K_(2) Cr_(2) O_(7)`
`(NH_(4) ) _(2) Cr_(2) O_(7)`
`KCiO_(3)`
`ZN (CiO_(3))_(2)`

Answer :B
Discussion
411.

The van't Hoff factor for 0.1 M Ba(NO_(3))_(2) solution is 2.74 . The degree of dissociation is :

Answer»

`91.3%`
`87%`
`100%`
`74%`

Solution :`BA(NO_(3))_(2)TOBA^(2+)+NO_(3)^(-)`
`alpha=(i-1)/(n-1)=(2.74-1)/(3-1)`
`=(1.74)/2=0.87`
DEGREE of dissociation =0.87xx100=87%
Discussion
412.

Time required to decompose SO_(2)Cl_(2) to half of the initial amount is 60 minutes .If the decomposition is a first order reaction ,calculate the rate constant of the reaction,=.

Answer»

Solution :60 minute =`60xx60` SEC.
But this time is `t_((1)/(2))` for half of the initial amount
`therefore t_((1)/(2)=60xx60` sec
For a FIRST order reaction
`K=(0.693)/(60xx60s)`
`=1.925xx10^(-4) s^(-1)`
Discussion
413.

Which of the following compounds is oxidised to prepare ethyl methyl ketone?

Answer»

2-Propanol
1-Butanol
2-Butanol
t-Butyl alcohol

Solution :`UNDERSET("2-Butanol")(CH_(3)-OVERSET(OH)overset(|)CH-CH_(2)-CH_(3)) overset([O])to underset("Ethylmethyl ketone")(CH_(3)-overset(O)overset(||)C-CH_(2)-CH_(3))`
Discussion
414.

Which of the following complexes is not expected to exhibit isomerism?

Answer»

(a) `[NI(NH_3)_4(H_2O)_2]^(2+)`
(B) `[Pt(NH_3)_2Cl_2]`
(C) `[Ni(NH_3)_2Cl_2]`
(d) `[Ni(en)_3]^(2+)`

Solution :`[Ni(NH_3)_2Cl_2]`
Discussion
415.

What is the role of lime stone and coke in the extraction of iron using blast furnace?

Answer»

SOLUTION :LIME stone-Flux.
Coke-Reducing AGENT.
Discussion
416.

Which of the esters shown, after reduction with LiAlH_(4) and aqueous workup, will yield two molecules of only a single alcohol?

Answer»

`C_(6)H_(5)COOCH_(3)`
`CH_(3)CH_(2)COOCH_(2)CH_(3)`
`CH_(3)COOCH_(3)`
`C_(6)H_(5)COOCH_(2)C_(6)H_(5)`

Answer :D
Discussion
417.

Which of the C-C- bond is strongest

Answer»

Formed by `sp^3-sp^3` hybridised carbon ATOM (as in alkanes)
Formed by `sp^2-sp^2` hybridised carbon atom (as in alkanes)
Formed by sp-sp hybridised carbon atom (as in alkanes)
All are equal

Solution :`sp-sp gt sp^2 - sp^2 gt sp^3 -sp^3`
ORDER of BOND STRENGTH
Discussion
418.

What is the end product in the following sequence of reaction ? Acetamide underset("Heat")overset(P_(2)O_(5))rarr A underset(Zn//HCl)overset([H])rarr B

Answer»

<P>Methylamine
Ethylamine
Methyl isocyanide
Ammonium acetate

Solution :`underset("Acetamide")(H_(3)C-OVERSET(O)overset("||")(C)-NH_(2)) underset(-H_(2)O)overset(P_(2)O_(5), DELTA)(RARR)H_(3)C-C equiv N underset(4[H])overset(Zn//HCl)(rarr) underset("Ethylamine")(H_(3)C-CH_(2)-NH_(2))`
Discussion
419.

Ziesel's method involves the estimation of

Answer»

`-OCH_3` and `-OC_2H_5` GROUPS
`-CH_3` and `-C_2H_5` groups
`CH_3COO-` and `C_2H_3CH_2COO-` groups
All the above.

SOLUTION :`-OCH_2` and `-OC_2H_5` groups.
Discussion
420.

The weight of HCl present in one litre of solution, if pH of the solution is one :

Answer»

3.65 g
36.5 g
0.365 g
0.0365 g

Answer :A
Discussion
421.

When C_(2)H_(5)OH is mixed with ammonia and passed over heated alumina, the compound formed is

Answer»

`CH_(3)OCH_(3)`
`C_(2)H_(5)NH_(2)`
`C_(2)H_(5)OC_(2)H_(5)`
`C_(2)H_(4)`

ANSWER :B
Discussion
422.

The trans-alkenes are formed by the reduction of alkynes with-

Answer»

`Na//liq.NH_3`
Sn/HCl
`H_2//Pd-C,BaSO_4`
`NaBH_4`

SOLUTION :
Discussion
423.

What weight of AgCl will be precipitated whena solution containing 4 . 77 g of NaCl is added to asolution of 5 . 77 g of AgNO_(3) ? (Na = 23, Cl = 35 . 5, Ag = 108 , N = 14 and O = 16)

Answer»

Solution :`NACL + Ag NO_(3) to NA NO_(3) + Ag Cl`
No . Of MOLESOF `NaCl = ( 4 . 77)/( 58 . 5) = 0 . 08154`
Noof moles of `ag NO_(3) = ( 5 . 77) /( 170) = 0 . 0 3394`
Sinceno. of moles of `AgNO_(3)`is lessthenthat of NaClthe whole of `AgNO_(3)` SHALL convertinto AgCl `AgNO_(3)` is a limitingreagent). Applyingthus the POAC forAg atomsas the Agatoms are conserved .
molesofAg in `AgNO_(3) ` = moles of Ag in AgCl
` 1 xx`moles of `AgNO_(3)= 1 xx ` molesof AgCl
`(wt. of AgNO_(3))/( mol. wt. of AgNO_(3)) = (wt.of AgCl)/( mol.wt.of AgCl)`
Wt. of AgCl = ` 0 . 0 3394 xx 143.5 = 4.87` g
Discussion
424.

The total no. of oxidation states of sulphur (only magnitude) in S_(8), SF_(2), H_(2)S is

Answer»


SOLUTION :`S_(8)=0 OVERSET(+2)H_(2)overset(-2)S""overset(+2)Soverset(-1)F_(2) :. (0+2-2)` So MAGNITUDE = 0
Discussion
425.

Which of the following has no net dipole moment ?

Answer»




Solution :cis FORM have some net DIPOLE moment.
Discussion
426.

What kind of reactions are not catalysed by the catalyst?

Answer»

SOLUTION :Non-spontaneous
Discussion
427.

Which one of the follwing is the is the correct order of oxidation nuimber of Iodine (I) in I_(2), HI HIO_(4) and ICI

Answer»

1
2
3
4

Solution :FORMULA of any compund can be formed by interchanging the VALENCIES of cation and anion and then written as SUBSCRIPT i.e
LTRBGT Hence the valency of GALLIUM is +3
Discussion
428.

When Acetaldehyde is treated with LiAlH_4 What is the product formed

Answer»

`CH_3COOH`
`CH_3-CH_2-OH`
`CH_3-OH`
`HCOOH`

ANSWER :B
Discussion
429.

Transition elements show high melting points . Why ?

Answer»

Solution :This is because all electrons FORM ( n-1) d orbitals and NS orbitals PARTICIPATE in forming metallic bonds. THUS, LARGE number of electrons of electrons participate forming large number of metallic bonds.
Discussion
430.

The type of isomerism shown by [Co(en)_2(NCS)_2]Cl and [Co(en)_2(NCS)Cl]NCS is,

Answer»

Co-ordination
Ionisation
Linkage
All above

Answer :B
Discussion
431.

Which has the highest oxidizing power?

Answer»

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

Answer :C
Discussion
432.

Which of the two : V (IV)or V (V) is paramagnetic?Give reasons. At No ofV =23

Answer»

SOLUTION :`._(23)V=[Ar]3d^(3)4s^(2) , V (IV)= [Ar]3d^(1) , V(V) = [Ar] 3d^(0)`
THUS, V(IV) has ONE UNPAIREDELECTRON while V(V) has no unpairedelectron. Hence, V(IV)is paramagnetic.
Discussion
433.

The total number of diprotic acids among the following is H_(3)PO_(4), H_(2)SO_(4), H_(3)PO_(3), H_(2)CO_(3), H_(2)S_(2)O_(7), H_(3)BO_(3), H_(3)PO_(2), H_(2)CrO_(4), H_(2)SO_(3)

Answer»


SOLUTION :DIPROTIC acids have TWO replaceable H-atoms. For example, `H_(2)SO_(4), H_(3)PO_(3), H_(2)CO_(3), H_(2)S_(2)O_(7), H_(2)CrO_(4) and H_(2)SO_(3)`.
Discussion
434.

The volume of 0.1 M HCl required to neutralise completely 2 g of an equimolar mixture of Na_(2)CO_(3)andNaHCO_(3) is

Answer»

318.76 mL
325 mL
215 mL
225 mL

Answer :A
Discussion
435.

Write IUPAC names for : (i) [Cr(NH_(3))_(6)]^(3+) (ii) [Ni(NH_(3))_(6)]Cl_(2)

Answer»

SOLUTION :(i) hexaamminechromium(III) ION(II) hexaamminenickel (II) CHLORIDE
Discussion
436.

Which one of the following is used in the manufacture of Bakelite?

Answer»

METHANAL
Ethanal
Phenyl methanal
Butanal

SOLUTION :Methanal
Discussion
437.

When S_(2)Cl_(2) is hydrolysed, the product formed is

Answer»

HCL
`SO_(2)`
S
All

ANSWER :D
Discussion
438.

Which of the following statements regarding the resonance energy of benzene is correct?

Answer»

The energy REQUIRED to break the C-H BOND in benzene.
The energy required to break the C-C bondin benzene.
The energy is a measure of stability of benzene.
The energy required to break both C-H bond and C-Cbond in benzene.

SOLUTION :Resonance energy is a measure of stability.
Discussion
439.

The work function for Cesium atom is 1.9 eV . Calculate the threshold frequency of the radiation . If the Cesium element is irradiated with a wavelength of 500 nm , calculate the kinetic energy of the ejected photoelectron .

Answer»

SOLUTION :`4.54xx10^(5)`
Discussion
440.

The rusting of iron takes place as follows 2H^(+)+2e^(-)+1//2O_(2)toH_(2)O_((l)),E^(@)=+1.23V Fe^(2+)+2e^(-)toFe_((s)),E^(@)=-0.44V Calculate DeltaG^(@) for the net process

Answer»

`-322kJ" "MOL^-1`
`-161kJ" "mol^(-1)`
`-152kJ" "mol^(-1)`
`-76kJ" "mol^(-1)`

Solution :`Fe(s)toFe^(2+)+2E^(-),DeltaG_(1)^(o)`
`underline("2H^(+)+2e^(-)+1//2O_(2)toH_(2)O(l),DeltaG_(2)^(o)"")`
`Fe(s)+2H^(+)+1//2O_(2)toFe^(2+)+H_(2)O,DeltaG_(3)^(o)`
APPLYING, `DeltaG_(1)^(o)+DeltaG_(2)^(o)=DeltaG_(3)^(o)`
`DeltaG_(3)^(o)=(-2Fxx0.44)+(-2Fxx1.23)`
`DeltaG_(3)^(o)=-(2xx96500xx0.44+2xx96500xx1.23)`
`DeltaG_(3)^(o)=-322310J`
`thereforeG_(3)^(o)=-322kJ`
Discussion
441.

When dilute ferrous sulphate solution is added lto an aqueous solution containing nitrate ion followed by careful addition of concentrated sulphuric acid along the sides of test tube a ,brown ring is formed at the iterface between the solution and sulphuric acid layers .Which is anion is confined by the appearance of brown ring .What the conposition of the brown ring ?

Answer»

SOLUTION :A brown RING wall from at the junction of the TWO layers ,indicting the presence of NITRATE ion.The brown ring formed in the confirmatory test for the nitrate ion is DUE to the complexcalled nitros ferrous sulphate with the formula`[Fe(H_2O)_5(NO)]SO_4`
Discussion
442.

Which reagents would you see to synthesize this compound by an aldol condensation ? C_(6)H_(5)CH = Choversetoverset(O)("||")CC_(6)H_(5)

Answer»

`C_(6)H_(5)oversetoverset(O)("||")CH and C_(6)H_(5)CH_(2)oversetoverset(O)("||")CH`
`C_(6)H_(5)CH_(2)oversetoverset(O)("||")CH and C_(6)H_(5)CH_(2)oversetoverset(O)("||")"CC"H_(3)`
`C_(6)H_(5)CH = CHoversetoverset(O)("||")CH and C_(6)H_(5)OH`
`C_(6)H_(5)oversetoverset(O)("||")CCH_(3) and C_(6)H_(5)oversetoverset(O)("||")CH`

Answer :D
Discussion
443.

Which complex ion of the following possess 2.82 BM magnetic moment?

Answer»

`Ni(CO)_(4)`
`[NiCl_(4)]^(2-)`
`Ni("PPH"_(3))_(4)`
`[Ni(CN)_(4)]^(2-)`

Answer :B
Discussion
444.

What happens when ethanol is treated with thionyl chloride?

Answer»

SOLUTION :ETHYL chloride is obtained :
`underset("alcohol")underset("Ethyl")(C_(2)H_(5)OH)+SOCl_(2)overset("Pyridine")underset(Delta)rarr underset("Chloride")underset("Ethyl")(C_(2)H_(5)Cl)+SO_(2)uarr+Hcluarr`
Discussion
445.

Which of the following molecular orbital has two nodal plane?

Answer»

`alpha^(***)1s`
`pi2p_(x)`
`PI^(***)2p_(y)`
`sigma^(***)2p_(z)`

SOLUTION :`pi***2p_(y)` has two NODAL planes.
Discussion
446.

Why are aryl halides less reactive towards 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 because C-X bond in aryl halides has partial double bond CHARACTER due to resosnance. Therefore, its cleavage is very difficult as compared to ALKYL halides where C-X bond is not involved in any resosnace. for more details,
(a).
(b). By deactivating the ring: Benzene ring can be deactivated with the help of electron withdrawing GROUPS such as nitro `(-NO_(2))` groups and as a result, nucleophilic substitution can be carried under milder conditions. for Example .
Discussion
447.

Which one of the following is not a simple ether?

Answer»

`C_6H_5 - O - CH_2- CH_3`
`CH_3- O - CH_3`
`C_6H_5 - O - C_6H_5`
`C_2H_5 - O - C_2H_5`

SOLUTION :`C_6H_5 - O - CH_2- CH_3`
Discussion
448.

Write the Nernst equation for following cell : Sn(s)|Sn^(2+)|H^(+)|H_(2)(g)(1"bar")|Pt(s)

Answer»

Solution :The cell REACTION is :
`SN+2H^(+)toSn^(2+)+H_(2)`
n=2
`E_("cell")=E_("cell")^(@)+(2.303RT)/(nF)log""([H^(+)]^(2))/([Sn^(2+)])`
or `E_("cell")=E_("cell")^(@)+(0.0591)/(n)log""([H^(+)]^(2))/((Sn^(2+)))`
Discussion
449.

Write the IUPAC name of [PtCl_(2)(en)_(2)(NO_(3))_(2)].

Answer»

SOLUTION :Dichloridobis(ethylenediammine)nitratoplatinum(IV)
Discussion
450.

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity

Answer»

`N_2O_5`
`NO_2`
`N_2O`
NO

Solution :Nitrous oxide `(N_2O)` occurs naturally in environment.In automobile ENGINE , when FOSSIL is burnt DINITROGEN & dioxygen combine to yield NO & `NO_2`
Discussion