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11751.

Which reagents from the following give aldehyde by reacting with primary alcohol ?

Answer»

`PCC+ CH_(2)Cl_(2)`
`KMnO_(4)+ H_(2)SO_(4)`
`KMnO_(4)+KOH`
`Na_(2)Cr_(2)O_(7)+ H_(2)SO_(4)`

Solution :`PCC+ CH_(2)Cl_(2)`
Discussion
11752.

The stabilization of coordination compound due to chelation is called the chelate effect. Which of the following is the most stable complex species?

Answer»

`[Fe(CO)_(5)]`
`[Fe(CN)_(6)]^(3-)`
`[Fe(C_(2)O_(4))_(3)]^(3+)`
`[Fe(H_(2)O)_(6)]^(3+)`

Answer :C
Discussion
11753.

The size of colloidal particles is in the range:

Answer»

`0.1 nm - 1 nm `
` 1 nm-100 nm `
`100 nm-1000 nm`
`1000 nm-10000 nm.`

Answer :B
Discussion
11754.

Write the IUPAC name of the CH_3 - underset(OH)underset(|)CH- underset(OH)underset(|)CH-CH_3

Answer»

SOLUTION :butane-2,4-diol
Discussion
11755.

The standard reduction potentials of Cu^(2+)|"Cu and"Cu^(2+)| Cu^(+) are 0.337V and 0.153V respectively The standard electrode potential of Cu^(+)|Cu half cell is

Answer»

0.184V
0.827V
0.521
0.490V

Solution :We have, ltBrgt
From the half-cell REACTIONS, it follows that
`DeltaG_(3)^(o)=DeltaG_(1)^(o)-DeltaG_(2)^(o)` i.E., `-FE_(Cu^(2+)//Cu)^(o)=-2FE_(Cu^(2+)//Cu)^(o)-(-FE_(Cu^(2+)//C^(+))^(o))`
or `E_(Cu^(+)//Cu)^(o)=2E_(Cu^(2+)//Cu)^(o)-E_(Cu^(2+)//Cu^(+))^(o)=2(0.337V)-0.153V=0.521V`.
Discussion
11756.

The standard reduction potentialfor Fe^(2+)//Fe and Sn^(2+)//Sn electrodesare -0.44 and -0.14 Vrespecitvely for the cell reaction Fe^(2+)+SnrarrFe+Sn^(2+) the standard emf is

Answer»

`+0.30 V`
`+0.58 V`
`+0.58 V`
`-0.30 V`

Solution :`E_("CELL")^(@)=E_("oxi")^(@)("Sn")+ E_("RED")^(@)(Fe)`
`=+0.14 +(-0.44) =- 0.30 V`
Discussion
11757.

Write the stick,condensed and bond line structure of the following compounds: a.4-tertButyl-3-chloroheptane ,b.2-(2-Bromophenyl)-1-chloro octane c m-Bromochlorobenzene d Perchlorobenzene e.1-Bromo-4-ethyl cycohexane .f2-Fluoro-3-methyl pentane 1-Chloro-4sec butyl-2methyl benzene ,1,4-Dichloro but-2ene i4-tert-Butyl-3-fluoro heptane ,j1iodo-4-ethyl cyclohexane k2-Fluoro-3-methyl pentane

Answer»

SOLUTION :
Discussion
11758.

Who is known as the father of chemotherapy?

Answer»

Alexander Fleming
Howard Florey
PAUL Ehrlich
Ernst Boris Chain 

SOLUTION :Paul Ehrlich
Ehrlich synthesized COMPOUNDS for CHEMOTHERAPY, so due to succesive efforts about chemotherapy he is known as FATHER of chemotherapy.
Discussion
11759.

Which out of the two, 2-cyclopentenol or 3-cyclopentenol has a chiral centre?

Answer»

Solution :
2-Cyclopentenol has a chiral CENTRE at `C_(1)` because it is ATTACHED to four DIFFERENT atoms/groups: `H,OH,CH_(2),CH=CH`.
In contrast, in 3-cyclopentenol, `C_(1)` is attached to H, OH and two identical `CH_(2)` groups, one on either side. therefore, the molecule is symmetrical (i.e., has a plane of symmetry) and hence is not chiral.
Discussion
11760.

Which one of the following is diamagnetic ion?

Answer»

`Cu^(2+)`
`Mn^(2+)`
`NI^(2+)`
`ZN^(2+)`

Answer :D
Discussion
11761.

When electricity is passed through H_(2)SO_(4) and CaCl_(2) solution, the ratio of hydrogen and calcium liberated by weight will be(atomic mass of Ca = 40)

Answer»

`1:10`
`1:40`
`1:20`
`1:30`

Solution :Equivalent WEIGHT of `H_(2)` =1 and Equivalent weight of CA =`(40)/(2) =20`
`therefore ` RATIO of weights OBTAINED will be `1:20`
Discussion
11762.

Which of the following is used as an antibiotic

Answer»

CIPROFLOXACIN
Ibuprofen
Paracetamol
Tocopherol

Solution :Ciprofloxacin is used as antibiotic while Paracetamol, Ibuprofen and tocopherol arerespectively antipyretic, PAIN KILLER and Vitamin E respectively.
Discussion
11763.

Which of the following is not the characteristic of ionic solids ?

Answer»

Very LOW value of ELECTRICAL conductivity in the molten STATE
Brittle nature
Very STRONG forces of interactions
Anisotropic nature

Solution :Ionic solids are very GOOD conductors in the molten state.
Discussion
11764.

The volume of a gas measured at 27^(@)C and 1 atm pressure is 10L. What final temperature would be required to reduce the volume to 5.0 L at 1 atm pressure ?

Answer»

450K
327K
150K
`100^(@)C`

SOLUTION :`V_(1) = ` 10L, `T_(1)` = 273 `+ 27 = 300K`,
`p_(1) = `1 ATM
`V _(2) =`5L,
`T_(2) = ?`
`p_(2) =` 1 atm
Since pressure is constant ,
`( V_(1))/( T_(1)) = ( V_(2))/( T_(2))`
or `T_(2) = ( V_(2))/( V_(1))xxT_(1) = ( 5)/( 10) XX 300`
Discussion
11765.

Which of the following will be dehydrated most readily in alkaline medium?

Answer»




Solution :Aldols i.e., `beta`-hydroxyaldehydes or `beta`-hydroxy-ketones (under ALKALINE or ACIDIC conditions) READILY UNDERGO dehydration to form `alpha,beta`-unsturated aldehydes or ketones.
Discussion
11766.

What is the advantageof using antihistamines over antacids in the treatment of acidity ?

Answer»

Solution :Usual antacids control only the symptoms and not the cause They work by neutralising the acid produced in the stomach but do not control the cause of production of more HCI Antihistamines, on the other hand, are drugs which suppress the action of HISTAMINE RESPONSIBLE for secretion of pepsin and HCI in the stomach. In other words. antihistamines prevent the binding of histamine with the receptors present in the stomach wall. As a result, LESS HCI is produced and hyperacidity is cured THUS, a better treatment for CURING acidity is to use antihistamines over antacids
Discussion
11767.

Writethemechanismofacidcatalyzed dehydrationofethanol to givenethene.

Answer»

Solution :Themechanism ofdehydrationofethanolinvolvesthefollowingorder:
Step 1: Initiallyethylalcoholgetsprotonatedto formethyloxonium ion.

Step 2 :Formationofcarbocation:It isthesloweststepandhence, theratedeterminingstepofthereaction.

Step : 3Formationofethene byeliminationofaproton

THEACID usedin step 1 isreleasedin step 3,theequilibriumisshiftedtotheright, etheneis removedas it is FORMED.
Discussion
11768.

Various combinations of n-type and p-type semiconductors are used for making electronic components. Diode is a combination of n-type and p-type semiconductors and is used as a rectifier. Transistors are made by sandwiching a layer of one type of semiconductor between two layers of the other type of semiconductor. npn and pnp type of transistors are used to detect or amplify radio or audio signals. The solar cell is an efficient photo-diode used for conversion of light energy into electrical energy. Germanium and silicon are group 14 elements and therefore, have a characteristic valence of four and form four bonds as in diamond. A large variety of solid state materials have been prepared by combination of groups 13 and 15 or 12 and 16 to simulate average valence of four as in Ge or Si. Typical compounds of groups 13 - 15 are InSb, AIP and GaAs, Gallium arsenide (GaAs) semiconductors have very fast response and have revolutionised the design of semiconductor devices. ZnS, CdS, CdSe and HgTe are examples of groups 12 - 16 compounds. In these compounds, the bonds are not perfectly covalent and the ionic character depends on the electronegativities of the two elements. 5. Comment on the nature of bonds in such compounds.

Answer»

Solution :The bonds are not perfectly COVALENT and the ionic CHARACTER DEPENDS UPON the electronegatives of the two elements.
Discussion
11769.

Which of the following is the first oxidation product of secondary alcohol?

Answer»

ALEKENE
ALDEHYDE
Ketone
CARBOXYLIC acid

ANSWER :C
Discussion
11770.

What kind of radioactive decay does not lead to the formation of a daughter nucleus that is an isobar of the parent nucleus

Answer»

`ALPHA-`rays
`beta-`rays
Positron
Electron capture

Solution :When a RADIOACTIVE element EMITS an `alpha`-PARTICLE, the atomic no. of the resulting nuclide DECREASES by two units and atomic mass decreases by 4 units
Discussion
11771.

Which of the following are addition homo-polymer?

Answer»

Teflon
SBR
PVC
Natural rubber

Solution : Polythene, nylon-6 and polyester are CHAIN polymers WHEREAS BAKELITE is CROSS network polymer.
Discussion
11772.

Which of the following compound when treated with dibenzyl cadmium yields benzyl methyl ketone?

Answer»

Acetone
Acetaldehyde
Acetic acid
ACETYL chloride

Solution : Acetyl chloride when treated with dibenzyl CADMIUM yields benzyl methyl ketone.
`2CH_(3)-underset(O)underset(||)(C)-Cl+Ph_(2)CD to 2CH_(3)-underset(O)underset(||)(C)-Ph+CdCl_(2)`
Discussion
11773.

Which of the following species has lowest ionisation potentail

Answer»

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

ANSWER :D
Discussion
11774.

writethe structuralformulaeand IUPAC namesof thedifferentalkanes formed whena miture of1-bromopropane and2- bromopropane is reacted withsodiumin presence ofether. Whatis thenameof the reaction ?

Answer»

SOLUTION :`(a)UNDERSET("1-Bromopropane")(CH_(3)CH_(2)CH_(2)Br+2Na+Brunderset("1-Bromopropane ")(CH_(2)CH_(2)CH_(2))toCH_(3)underset("Hexane")(CH_(2))_(4) CH_(3)`
Discussion
11775.

Using the valence bond approach, deduce the shape and magnetic behaviour of [Cr(NH_(3))_(6)]^(3+) ion.

Answer»

Solution :Cr has electronic configuration [Ar] `4S^(1) 3d^(5)`
`Cr^(3+)` has electronic configuration [Ar] `4s^(0) 3d^(3)`

`d^(2)sp^(3)` HYBRIDISATION GIVES octahedral shape. The complex is PARAMAGNETIC due to presence of UNPAIRED electrons.
Discussion
11776.

Which of the property given below is not associated with glycerol :

Answer»

Formation of water and `CO_2` on reduction
Formation of tartaric acid on oxidation
Formatin of ACROLEIN on dehydration
Formation of ALLYL IODIDE with `PI_3`

ANSWER :A
Discussion
11777.

Which is the real order of basicity of hydrides of elements of Group-15 ?

Answer»

`NH_(3) LT PH_(3) lt AsH_(3) lt SbH_(3) GT BiH_(3)`
`BiH_(3) lt SbH_(3) lt AsH_(3) lt PH_(3) lt NH_(3)`
`NH_(3) gt PH_(3) gt BiH_(3) gt AsH_(3) gt SbH_(3)`
`NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)`

ANSWER :D
Discussion
11778.

Whichof the following is a polymide?

Answer»

TEFLON
NYLON-`6,6`
Bakelite
Terylene

Answer :B
Discussion
11779.

What is meant by vapour phase refining ? Write any one example of the process which illustrates this technique, giving the chemical equation involved .

Answer»

Solution : Vapour PHASE refining:It is a efining method in which the metal in which the metal is converted into its VOLATILE compound and collected somewhere else. It is then decomposed to abtain PURE metal .
EXAMPLE : Mond.s PROCESS for refining of zirconium .
Equation involved :
`Ni+4Co=Ooverset(330-350K)toNi(CO)_(4)`
`Ni(Co)_(4)overset(450-470K)toNi+4Co`
Or
Discussion
11780.

Which of the following is superimposable?

Answer»

Propan-2-ol
2,3 - Pentadiene
sec-Butyl ALCOHOL
AFF of these

Answer :A
Discussion
11781.

Which compound is zero valent metal complex?

Answer»

`[Cu(NH_(3))_(4)]SO_(4)`
`[Pt(NH_(3))_(2)CI_(2)]`
`[Ni(CO)_(4)]`
`K_(3) [FE(CN)_(6)]`

Solution :`[Cu(NH_(3))_(4)]SO_(4)` to oxidation no. of `Cu = +2`
`[Pt(NH_(3))_(2)CI_(2)]` to oxidation number of `Pt = +2`
` [Ni(CO)_(4)] to`oxidation number of `Ni = 0`
`K_(3)[Fe(CN)_(6)] to` oxidation number of `Fe = +3`
Discussion
11782.

Which of the following is not an antibiotics?

Answer»

CHLORAMPHENICOL
Bithional
Penicillin
Neomycin

Answer :B
Discussion
11783.

Which of the following is used in fruit juisces ?

Answer»

`SO^(2)`
Saccharin
Boric acid
Both a and B

ANSWER :D
Discussion
11784.

The value of II^(nd)Delta_(eg)H of O & S respectively in KJ/mole :-

Answer»

`+580, +780`
`+780, +580`
`+580, –780`
` –780, –580`

SOLUTION :`X_(p) = (I_(p)+EA)/(125) "KCAL mole"^(-1) , X_(p)=(275 +86)/(125)=2.8`
Discussion
11785.

Which of the allotropes of sulphur has no sharp melting point and is insoluble in CS_(2) ?

Answer»

RHOMBIC SULPHUR
Monoclinic sulphur
PLASTIC sulphur
None of the above

Answer :B
Discussion
11786.

Which represents and amide ?

Answer»




ANSWER :C
Discussion
11787.

Which of the following is most solubule in water?

Answer»

`MgSO_4`
`CaSO_4`
`SrSO_4`
`BaSO_4`

ANSWER :A
Discussion
11788.

what is the wavelength (in nm) of the spectral line associated with a transition from n=3 to n=2 for Li^2+ ion (R=109677 cm^-1)

Answer»

73.39
102
114
43.14

Answer :A
Discussion
11789.

What is the unit of molar conductance ?

Answer»

SOLUTION :`OHM^(-1)`,`cm^2 MOLE^(-1)`
Discussion
11790.

Which statementsare correct?

Answer»

Lactose is a DISACCHARIDE and is a reducing SUGAR.
`alpha`-D-glucopyranoside and `beta` - D-glucopyranose are anomers.
Methyl `-alpha`-D-glucopyranoside has an acetal STRUCTURE and is a non-reducing sugar.
`alpha`-D-Glucopyranose has a hemiacetal structure ans is a reducing sugar.

Answer :A::B::C::D
Discussion
11791.

The specific conductance of saturated solution of CaF_2 is 3.86 xx 10^(-5) ohm ch^(-1)and that of water used for solution is 1.15 xx 10^(-5). The specific conductance of CaF_2 along is

Answer»

`3.86 XX 10^(-4)`
`4.01 xx 10^(-5)`
`3.7 xx 10^(-4)`
`3.71 xx 10^(-5)`

ANSWER :D
Discussion
11792.

Which of the following reaction is true for preparation of methyl fluoride ?

Answer»

`CH_(4)+HF RARR`
`CH_(3)OH+HF rarr`
`CH_(4)+F_(2)rarr`
`CH_(3)Br+AgF rarr`

Answer :D
Discussion
11793.

Which of the following has smallest bond bond angle?

Answer»

`OF_(2)`
`Cl_(2)O`
`OBr_(2)`
`H_(2)O`

ANSWER :A
Discussion
11794.

What is the name given to the anionic sites occupied by unpaired electrons ?

Answer»

SOLUTION :F-centres
Discussion
11795.

Write the chemical equation for the reactions which occur when sodium iodate (NalO_3) is reduced with sodium hydrogen sulfite.

Answer»

SOLUTION :`NaIO_(3) + 3NaHSO_(3) RARR 3NaHSO_(4) + NAL.`
Discussion
11796.

The titanium ( atomic number 22) compound that does not exist I s

Answer»

TiO
`TiO_(2)`
`K_(2)TiF_(6)`
`K_(2)TiO_(4)`

Solution :OXIDATION STATES will be
`overset(+2)(Ti)O, overset(+4)(Ti)O_(2), K_(2)overset(+4)(Ti)F_(6), K_(2)overset(+6)(Ti)O_(4)`
Ti shows oxidation states of `+2, +3, `and `=4` only. So `K_(2)TiO_(4)` does not exist.
Discussion
11797.

Which metal will dissolve if the cell works Cu|Cu^(2+)||Ag^(+)|Ag

Answer»

CU
Ag
Both (1) and (2)
NONE of these

ANSWER :A
Discussion
11798.

Which of the below mentioned ether (s) is (are) not likely to form peroxides when exposed to air?

Answer»

`CH_(3)-CH_(2)-O-CH_(2)-CH_(3)`


`(CH_(3))_(2)CH-O-CH(CH_(3))_(2)`

ANSWER :C
Discussion
11799.

(x)/(m)=KC^(1//n) where C = Concentration of a m solution, x = wt of adsorbed solute m =Wt of adsorbent. The equation represents -

Answer»

Langmuir adsorption isotherm
Freundlich adsorption isotherm
Arhenius equation
CHEMI SORPTION isotherm

Answer :B
Discussion
11800.

Which one of the following statements is correct? The chlorides of grup II metals

Answer»

All HYGROSCOPIC in nature
Increase in littice enthalpy from `BeCl_(2) to BaCl_(2)`
DECREASE in m.p. from `BeCl_(2) to BaCl_(2)`
All insouble except `BaCi_(2)`

Answer :A
Discussion