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19401.

Which of the following can be used to convert ._(7)^(14)N " into " ._(8)^(17)O

Answer»

Deutrons
Protons
`ALPHA-`particles
Neutron

Solution :`._(7)N^(14) + ._(2)He^(4) (alpha-"particle") rarr ._(8)O^(17) + ._(1)H^(1)`
Discussion
19402.

Which of the following compounds shows tautomerism

Answer»

HCHO
`CH_(3)CHO`
`CH_(3)COCH_(3)`
HCOOH

Solution :KETONES show tautomerism. They form keto and enol form
`{:(""O""OH),("||""|"),(CH_(3)-C-CH_(3)overset("Tautomerism")hArr CH_(3)-C=CH_(2)):}`
Discussion
19403.

Which of the following acid exists as zwitter ion ?

Answer»

Suphanilic ACID
Picric acid
Carbolic acid
Carbonic acid.

Solution :Suphanilic acid has both BASIC and acidic GROUP. As such can exist as a zwitter ION
Discussion
19404.

Which statement is correct about chemisorptions?

Answer»

It is irreversible in nature
It involves FORMATION MULTI layer of adsorbent on adsorbate
Decreases with increase of temperature
It involves the weak attractive forces between adsorbent and adsorbate

Answer :A
Discussion
19405.

Which of the following is not tetrahedral in shape ?

Answer»

`NH_(4)^(+)`
`SiCl_(4)`
`SF_(4)`
`SO_(4)^(2-)`

Solution :`SF_(4)`is trigonal bipyramidal (See-saw)
Discussion
19406.

What are biomolecules ? Give two examples occurring in living systems.

Answer»

SOLUTION :These are the imolecules which TAKE part in REACTION eg STARCH, cellulose.
Discussion
19407.

What should be done to increase filteration reaction in ultrafilteration process ?

Answer»

To INCREASE temperature
To DECREASE temperature
To decrease PRESSURE
To increase pressure 

SOLUTION :To increase pressure
Discussion
19408.

The reference electrode is made by using

Answer»

`ZnCl_2`
`CuSO_4`
`HgCl_2`
`Hg_2Cl_2`

ANSWER :D
Discussion
19409.

When the following reaction was carried out in a bomb calorimeter, DeltaE is found to be -742.7kJ/mol of NH_(2)CN(s) at 298 K. NH_(2)CN(s)+3/2O_(2)(g)toN_(2)(g)+CO_(2)(g)+H_(2)O(l) Calculate DeltaH_(298) for the reaction.

Answer»

SOLUTION :`-741.5kJ`
Discussion
19410.

Which of the following represents the Lewis structure of N_(2) molecule ?

Answer»

`""_(xx)^(xx)N-=N_(xx)^(xx)`
`OVERSET(xx xx)(""_(xx)^(xx)"N ")-=overset(xx xx)(" N"_(xx)^(xx))`
`overset(xx xx)UNDERSET(xx xx)(""_(xx)^(xx)"N ")-overset(xx xx)underset(xx xx)(" N"_(xx)^(xx))`
`overset(xx xx)underset(xx xx)(""_(xx)^(xx)"N ")=overset(xx xx)underset(xx xx)(" N"_(xx)^(xx))`

Solution :Lewis STRUCTURE of `N_(2)`molecule is
Discussion
19411.

Which of the following does the best represent the structure of the carboxylate ion.

Answer»




NONE of the above

ANSWER :B
Discussion
19412.

Which of the following statement(s) in (are) true ?

Answer»

IONISATION energy `prop 1/("Screening EFFECT")`
The first ionisation energies of Be and Mg are more than ionisation energies of B and Al respectively
Atomic and ionic radii of Niobium and Tantalum are almost same
Metallic and COVALENT radii of potassium are 2.3 Å and 2.03 Å respectively

Solution :(A)As screening effect increases, effective NUCLEAR charge decreases and thus valence shell ELECTRON is loosely bound.Hence ionization energy decreases.
(B)Be and Mg and have `ns^2` configuration (stable configuration)
( C)Due to lanthanide contraction.
(D)`r_("metallic")gtr_("covalent")`(covalent bond formation involves the overlapping of orbitals)
Discussion
19413.

The statement that doesnot belongto bohr 's model of atom is

Answer»

the energy of the eletrons in the orbit is quantized
the electron in the orbit NEAREST to the nucleus is in LOWEST energy state
the ELECTRONS revolvein different orbits AROUND the nucleus
the electrons emitenergy during revolutiondue to the PRESENCE of coulmbic forcesof attaraction

Answer :D
Discussion
19414.

Which of the following is tertiary alcohol :

Answer»

`CH_3-CH_2-OH`


ANSWER :B
Discussion
19415.

Write the structures of the major organic product in each of the following: CH_3CH_2CH_2Cl + NaI underset("heat")overset("acetone")(rarr).

Answer»

SOLUTION :`CH_3-CH_2-CH_2-I`
Discussion
19416.

The vapour pressure of benzene at 25^(@)C is 639.7mmHg and the vapour pressure of solution of a solute in benzene at the same temperature is 631.9mm of mercury. Calculate the molality of the solution

Answer»

<P>

SOLUTION :We have,
`(p^(0)-p)/(p^(0))=(n_(1))/(n_(2))` ……………….(Eqn. 1)
or `(n_(1))/(n_(2))=("MOLES of solute")/("moles of solvent")=(639.7-631.9)/(639.7)=0.0122`
Thus 1 mole of solvent `(C_(6)H_(6))` contains `0.0122` mole of solute, or `78g` of solvent`(C_(6)H_(6))` contains `0.0122` mole of solute `(C_(6)H_(6)=78)`
`:.` MOLALITY `=(0.0122)/(78)xx1000=0.156m`
Discussion
19417.

What is the reagent used in the conversion of alkyl halide into alkene?

Answer»

SOLUTION :ALCOHOLIC POTASSIUM HYDROXIDE
Discussion
19418.

Which among the following is a branched chain polymer.

Answer»

LDPE
NYLON
Phenol FORMALDEHYDE RESIN
Terylene

Answer :A
Discussion
19419.

Which of the statements about solutions of electrolytes is not correct ?

Answer»

Conductivity of SOLUTION depends UON SIZE of ions.
Conductivity depends upon viscosiy of solution.
Conductivity does not DEPEND upon solvation of ions present in solution.
Conductivity of solution INCREASES with temperature.

Solution :Conductivity does not depend upon solvation of ions present in solution.
Discussion
19420.

Why are low spin tetrahedral complexes not formed ?

Answer»

SOLUTION :For TETRAHEDRAL complexes, the CRYSTAL field stabilisation energy is lower than pairing energy.
Discussion
19421.

Which of the following is plant steroid?

Answer»

estrogen
testosterone
androsterone
sitosterol

Answer :A
Discussion
19422.

Which of the following order is incorrect?

Answer»

`HF gt HCL gt HBr gt HI`- Acidic strength<BR>`CL gt F gt Br GTI `-Electron affinity
`Cl_2 gt Br_2 gt F_2 gt I _2`- BOND dissociation energy
`F_2 gt CL_2 gt Br_2 gt I_2`- Oxidising power

Answer :A
Discussion
19423.

Which of the following reaction does not occur ?

Answer»

`F_(2)+2Cl^(- ) to 2F^(-)+ Cl_(2)`<BR>`Br_(2)+2I^(-) to 2Br^(-)+I_(2)`
`Cl_(2)+2Br^(-) to 2Cl^(-)+Br_(2)`
`I_(2)+2Cl^(-) to 2I^(-)+Cl_(2)`

Answer :D
Discussion
19424.

Which of the following is allylic alcohol

Answer»




ANSWER :B
Discussion
19425.

vant Hoff factor for 0.1 M ideal solution is

Answer»

`0.1`
1
`0.01`
NONE of these

SOLUTION :for any IDEAL solution, i=1.
Discussion
19426.

Which of the following statements regarding the manufacture of H_2SO_4, by contact process is not true

Answer»

Sis burmt in air to form `SO_2`
`SO_(2)` is oxidized to `SO_(3)`, in presence of `V_2O_(5)` as catalyst, (or finely divided SPONGY platinum as catalyst) at a PRESSURE of 2 ATM and a temperature of about 700K
`SO_(3)`, is dissolved in `H_(2)O` to GET 100% `H_(2)SO_(4)` acid
`H_(2)SO_(4)` obtained by contact process is of higher purity than that obtained by lead-chamber process.

Answer :C
Discussion
19427.

Two reactions r_(1) and r_(2) proceed at 25^(@)C at the same rate. The temperature coefficient of the second reaction is 2.5 times of temperature coefficient of the first reaction. The ratio of rates of these reactions at 96^(@)C will be (r_(2)//r_(1)), approx

Answer»

`10 : 1`
`5 : 1`
`15 : 1`
`25 : 1`

ANSWER :B
Discussion
19428.

Which acts as an additive to petrol?

Answer»

GLYCEROL
ETHANOL
PHENOL
METHANOL

SOLUTION :Ethanol
Discussion
19429.

Which substance is used as basic refractory material in furnace :

Answer»

`Al_2O_3`
`SiO_2`
CAO
`Fe_2O_3`

ANSWER :C
Discussion
19430.

Which of the following order of bond strength is//are correct? (a) C-CgtCl-ClgtS-SgtP-PgtO-O (b) H-HgtNeNgtO-OgtF-F (c) Cl-ClgtBr-BrgtF-FgtI-I (d) H-FgtH-HgtC-CgtN-NgtO-O (e)2ppi-2ppigt2ppi-3ppigt2ppi-3ppigt3ppi-3ppi Options :-

Answer»

`a,B,C`
`a,b,c,d`
`a,c,d`
All

Solution :`N//A`
Discussion
19431.

Transition metals and their oxides are used in industrial processes as:

Answer»

Detergents
Insecticides
Catalysts
None

Answer :C
Discussion
19432.

White Sn belongs to one of the seven crystal systems. The number of Bravis lattices possible for that monoclinic crystal system

Answer»

2
1
4
3

Answer :A
Discussion
19433.

What happens when : (i) An alkyl halide reacts with AgNO_(2) and product is reduced. (ii) An alkyl halide is treated with AgCN and product is hydrolysed. (iii) Methyl magnesium bromide is treated with cyanogens chloride.

Answer»

Solution :(i) `R-X + AgNO_(2) underset("-AgX")to R-NO_(2) OVERSET("Sn/HCI") underset([H]) to R-NH_(2)`
(ii) `R-X + AgCN underset ("-AgX") to RNC overset(H_(2)O/H^(+))to RNH_(2)+HCOOH `
(iii) `CH_(3)MgBr + CN-CI rightarrow CH_(3)CN + MG lt_(Br)^(CI)`
Discussion
19434.

Which of the following statements is/are true for [Pt(NH_(3))(H_(2)O)(Cl)_(2)]?

Answer»

It has diamagnetic character
It has SQUARE PLANAR geometry
It SHOWS geometrical and OPTICAL isomerism
It shows only geometrical isomerism

Solution :All `Pt^(2+)` complexes are square planar and diamagenetic.
Discussion
19435.

Which of the following is a redox-reaction-

Answer»

`2NA[Ag(CN)_(2) ]+Zn rarr Na_(2) [Zn(CN)_(4) ]+2Ag`
`BaO_(2) + H_(2)SO_(4) rarr BaSO_(4) + H_(2) O_(2)`
`N_(2)O_(5) + H_(2) O rarr 2HNO_(3)`
`AgNO_(3) + KI rarr AGI + KNO_(3)`

Answer :A
Discussion
19436.

What is the product of the reaction of ethanoyl chloride with diethylcadmium followed by acid hydrolysis?

Answer»

Solution :`underset("Ethanoyl CHLORIDE")(2CH_(3)COCl)+underset("Diethylcadmium")((CH_(3)CH_(2))Cd) overset("DRY ether")tounderset("BUTANONE")(2CH_(3)COCH_(2)CH_(3))+CdCl_(2)`.
Discussion
19437.

Which of the following statements are correct for ethers?

Answer»

Being linked to carbon ATOMS, the oxygen atom in ether is comparatively inert.
The tendency of alkyl halides to UNDERGO dehydrohalogenation in Williamson's synthesis follows the order `3^(@)gt 2^(@)gt1^(@)`.
Traces of WATER present in ethers can be removed with Na metal because ethers do not REACT with sodium metal.
None is correct.

Answer :A::B::C
Discussion
19438.

Which of the following compounds will not undergo azo coupling reaction with benzene diazonium chloride ?

Answer»

Aniline
Phenol
Anisole
Nitrobenzene

Solution :DIAZONIUM cation being a weak ELECTROPHILE, does not REACT with COMPOUNDS containing electron-withdrawing GROUPS such as`NO_2`
Discussion
19439.

The value of k_2 for the reaction at 27^@C Br_2(l)+Cl_2(g)hArr2BrCl(g) is '1 atm'.At equilibrium in a closed container partial pressure of BrCl gas is 0.1 atm and at this temperature the vapour pressure of Br_2(l) is also 0.1 atm. Then what will be minimum moles of Br_2(l) to be added to 1 mole of Cl_2 , initially to get above equilibrium situation :

Answer»

`10/6` MOLES
`5/6` moles
`15/6` moles
`2` moles

Solution :`{:(Br_2(L)+,Cl_2(g)" "hArr,2BrCl(g)),(t=0,1,0),(,(1-x),2x):}`
`k_p=((P_(BrCl)))^2/P_(Cl_2)=1` so, `P_(Cl_2)=(P_(BrCl))^2=0.01` atm
then at equilibrium, `n_(BrCl)/n_(Cl_2)=0.1/0.01=10=(2x)/(1-x)`
So, `10-10x=2x or x=10/12=5/6` moles
Moles of `Br_2(l)` required for MAINTAINING vapour PRESSURE of 0.1 atm `=2xx5/6 "moles" =10/6"moles"="moles of" BrCl(g)`
Moles required for taking part in reaction=moles of `Cl_2` used up `=5/6` moles .
Therefore required total mole `=10/6+5/6=15/6` mole
Discussion
19440.

Which of the following are used to convert R-CHO to R – CH_(2)OH ?

Answer»

`H_(2)//PD`
`LiAIH_(4)`
`NaBH_(4)`
REACTION with R-MgX followed by hydrolysis.

Solution :`RCHO+ OVERSET(H_(2)//Pd)to RCH_(2)OH`
It can also be prepared by using `NaBH_(4)` and `LiAlH_(4)` as a reducing agent.
`RCHO+ overset(NaBH_(4))to RCH_(2)OH`
`RCHO+ overset(LiAlH_(4))to RCH_(2)OH`
Reaction of RMgX with any ALDEHYDE other than methanal gives secondary alcohols not the primary alcohols.
Discussion
19441.

The units of conducivity are :

Answer»

`"SIEMENS"^(-1) CM^(-1)`
siemens cm
siemens `cm^(-1)`
siemens `cm^(-2) mol^(-1)`

Answer :C
Discussion
19442.

Under Wolff- Kishner reduction the conversion may be brought about are

Answer»

BENZOPHENONE to DIPHENYL methane
benzaldehyde to BENZYL ALCOHOL
CYCLOHEXANONE to cyclohexene
cyclohexanone to cyclohexanol

Answer :A
Discussion
19443.

Which of the following order is correct for Delta_(0)"/"Delta_(t)"/"Delta_(sp) ?

Answer»

`[FE(SCN)_(6)]^(3-)gt[Fe(C_(2)O_(4))_(3)]^(3-)`
`[Co(H_(2)O)_(3)F_(3)]gt[Co(H_(2)O)_(5)]^(3+)`
`[NiF_(6)]^(-2)gt[NiF_(6)]^(4-)`
`[Fe(H_(2)O)_(6)]^(2+)gt[Fe(H_(2)O)_(6)]^(3+)`

Solution :`Ni^(4+)gtNi^(2+)` (C.F. SPLITTING)
Discussion
19444.

Which of the following compound is 'P' ?

Answer»




ANSWER :C
Discussion
19445.

Thermodynamic equilibrium involes

Answer»

CHEMICAL equilibrium
Thermal equilibrium
Mechanical equilibrium
All the three

Answer :D
Discussion
19446.

Which of the following is positively charged sol?

Answer»

`CR(OH)_(3) ` sol
`TiO_(2)` sol
Gold sol
Methylene BLUE sol

Answer :A
Discussion
19447.

Which of the following is a gas ?

Answer»

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

ANSWER :A
Discussion
19448.

Which noble gas does not form clathrates:

Answer»

Xe
Kr
He
Ar

Answer :C
Discussion
19449.

Which of the following is presipitated when an arsenate reacts withh a magnesium mixture?

Answer»

`MgHAsO_(3)`
`Mg_(2)AsO_(3)`
`MgNH_(4)AsO_(4)*6H_(2)O`
`Mg_(2)NH_(4)AsO_(4)*6H_(2)O`

Answer :C
Discussion
19450.

Which of the following polymer is formed by anionic addition polymerization ?

Answer»

Polythene
Butyl rubber
POLYSTYRENE
Teflon

Solution :Polystyrene
Discussion