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17851.

Wurtz-Fittig reaction.

Answer»

Solution :WURTZ-Fittig reaction : When an alkyl HALIDE and an ARYL
halide is treated with sodium metal in DRY ether the corresponding
alkylarene (alkyl benzene) is FORMED. The reaction is known as Wurtz-
Fittig reaction.
Discussion
17852.

Which of the following is a narcotic analgesic?

Answer»

Ibuprofen
Aspirin
Paracetamol
Morphine

Answer :D
Discussion
17853.

Which one andofthe following lanthanoidshave completelyfilled Lu 4f orbital?

Answer»

GD and Eu
La and Ce
YB and LU
Pr and Pm

Solution :Yb and Lu
Discussion
17854.

What is meant by addition polymerization ?

Answer»

SOLUTION :Addition POLYMERIZATION is the type of polymerization in which a large number of molecules of the same or different monomers add to one another leading to the formation of a MACROMOLECULE without the ELIMINATION of simple molecules such as water. For EXAMPLE, formation of polyethene from ethene.
Discussion
17855.

Write the methematical from of Freundlich adsorption isotherm. Explain the different symbols used in the equation and is limitations.

Answer»
Discussion
17856.

Which one id least ionic in the following compounds ?

Answer»

`AgCl`
`KCL`
`BaCl_(2)`
`CaCl_(2)`

Answer :A
Discussion
17857.

Which chloride is covalent and soluble in ether?

Answer»

`BeCl_2`
`CaCl_2`
`SrCl_3`
`BaCl_2`

ANSWER :A
Discussion
17858.

Vinyl alcohol and ethanal are

Answer»

Metamers
TAUTOMERS
Position ISOMERS
Chain isomers

ANSWER :B
Discussion
17859.

What are the limitations of intermediate compound formation theory?

Answer»

Solution :Limitations :
(i) The intermediate COMPOUND theory FAILS to EXPLAIN the action of catalytic poison and activators (PROMOTERS). (ii) This theory is unable to explain the mechanism of heterogeneous catalysed REACTIONS.
Discussion
17860.

Whichone of thereagentdoes notreactwith glucose ?

Answer»

ACETICANHYDRIDE
Tollen's regent
Sodium BI sulphite
BROMINEWATER

ANSWER :C
Discussion
17861.

Two platinum electrodes were immersedin a solution of CuSO_(4) and electric current was passed through the solution. After some time, it was found that colour of CuSO_(4) disappeared with evolution of gas at the electrode. The colourless solution contains.

Answer»

PLATINUM sulphate
COPPER HYDROXIDE
copper sulphate
sulphuric ACID

Answer :D
Discussion
17862.

X, Y and Z are

Answer»

m-cresol, CATECHOL, Quinol
Catechol, RESORCINOL, Quinol
o-cresol, Resorcinol, Catechol
Resorcinol, Catechol, o-Creosol

Solution :It is the CORRECT ANSWER.
Discussion
17863.

Which of the following statements about low density polythene is FALSE :

Answer»

It is used in the manufacture of buckets, dust-bins etc.
Its synthesis REQUIRES HIGH pressure.
It is a poor conductor of electricity.
Its synthesis requires dioxygen or a peroxide initiator as a CATALYST

Solution :It is used in the manufacture of buckets, dust-bins etc.
Given statements (A), (B), (C) is TRUE and statement (D) is false.
Discussion
17864.

Which solvent allows smooth mutarotion of glucose ?

Answer»

CRESOL
PYRIDINE
cresol + pyridine

Solution :Cresol + pyridine
Discussion
17865.

Which of the following are intermediates in Sandmeyer reaction ? C_(6)H_(5)N^(+) = NCl^(-)(ii) C_(6)H_(5)N^(+) -= N (ii)C_(5)H_(5)(iv) C_(6)H_(5)Cl

Answer»

(ii) and (iii)
(ii) and (iv)
(i) and (ii)
(i) and (iv)

SOLUTION :`NA ` zeolite`+CA Cl_ 2 toCa`zeolite+`2Na Cl`
Discussion
17866.

Toluene on oxidation with dil. HNO_(3) and alkaline KmnO_(4) gives

Answer»

Benzaldehyde
Nitrotoluene
Phenol
Benzoic acid

Answer :D
Discussion
17867.

Which of the following is arranged in order of incresing radius?

Answer»

`K^(+) (AQ) lt NA^(+)(aq) lt LI^(+)(aq)`
`Na^(+)(aq) lt K^(+)(aq) lt Li^(+)(aq)`
`K^(+)(aq) lt Li^(+)( aq) lt Na^(+)(aq)`
`Li^(+)(aq) lt Na^(+) (aq) lt K^(+)(aq)`

ANSWER :A
Discussion
17868.

Tyndall effect is applicable when

Answer»

The DIAMETER of the dispersed PARTICLE is not MUCH SMALLER than the wavelength of the light used.
The diameter of the dispersed particles is much smaller than the wavelength of the light used.
The refractive indices of the dispersed phase and the dispersed phase and the dispersion medium must be same.
The refractive indices of the dispersed phase andthe dispersion medium must differ GREATLY in magnitude.

Solution :N//A
Discussion
17869.

Which transition metal reduces steam to evolve hydrogen

Answer»

Mg
FE
Sc
Pt

Solution :Iron DECOMPOSES steam into hydrogen when it is passed over red hot iron. `2Fe+3H_(2)Orarr Fe_(2)O_(3)+3H_(2)UARR`
Discussion
17870.

Which of the following is not a broad spectrum antibiotic ?

Answer»

tetracycline
Chloromycetin
penicillin
none of these

ANSWER :C
Discussion
17871.

Which indicator works in ph range 8-9.8?

Answer»

Phenophthalein
Methyl orange
Methyl red
Litmus

Answer :A
Discussion
17872.

Which is not true in case of catalyst ?

Answer»

The catalyst is unchanged chemically at the end of a reaction
The catalyst accelerates the reaction
In a reversible reaction, the catalyst alters the equilibrium position
A small AMOUNT of catalyst is OFTEN SUFFICIENT to bring about a large CHANGE in reaction

Answer :C
Discussion
17873.

Which of the following coordination compounds would exhibit optical isomerism ?

Answer»

trans-dicyanobis (ETHYLENEDIAMINE) CHROMIUM (III) chloride
tris-ethylenediamine) COBALT (III) bromide
pentaamminenitrocobalt (III) iodide
diamminedichloroplatinum (II)

ANSWER :B
Discussion
17874.

Which of the following is not a pyrimidine base

Answer»

Uracil
Thymine
Cytosine
Guanine 

ANSWER :D
Discussion
17875.

Which of the following combinations cab be used to synthesize ethanol

Answer»

`CH_(3)Mgl and CH_(3)COCH_(3)`
`CH_(3)Mgl and C_(2)H_(5)OH`
`CH_(3)Mgl and CH_(3)COOC_(2)H_(5)`
`CH_(3)Mgl and HCOOC_(2)H_(5)`

Solution :
Discussion
17876.

Write the names, molecular formula and structural formula of oxoacids of sulphur.

Answer»

SOLUTION :
Discussion
17877.

Which one among the following can not exhibit enantiomerism?

Answer»

1-Bromo-2-chlorobutane
2-Butanol
1,2-Dichlorobutane
DIPHENYL methanol.

Answer :D
Discussion
17878.

The unit of rate constant for third order reaction is ..

Answer»

`"mole"^(-3) "LIT"^(3) s^(-1)`
`"mole"^(-2) "lit"^(-2)s^(-1)`
`"mole" "lit"^(-1) s^(-1)`
`"mole"^(-2) "lit"^(2) s^(-1)`

ANSWER :B
Discussion
17879.

Write the structural formula of isobutyronitrile.

Answer»

SOLUTION :`CH_3 - UNDERSET(CH_3) underset(|) (C H) -CN`
Discussion
17880.

Which is more electropositive ?

Answer»

<P>Mg
Al
P
S

Answer :A
Discussion
17881.

Which of the following is not known?

Answer»

`Cu^(2+)`
`Sc^(2+)`
`FE^(2+)`
`Cr^(2+)`

ANSWER :B
Discussion
17882.

Which of the following is a condensation polymer ?

Answer»

Teflon
PVC
Polyester
NEOPRENE

Solution :Polyester is CONDENSATION POLYMER of glycol and terephthalic ACID . Teflon , PVC and neoprene are the addition polymers.
Discussion
17883.

The same amont of electricity was passed through two separate electrolytic cells containing solutions of nickel nitrate and chromium nitrate respectively. If 2.935 g of Ni was deposited in the first cell. The amount of Cr deposited in the another cell? Give : molar mass of Nickel and chromium are 58.74 and 52 gm^(-1) respectively.

Answer»

Solution :`Ni_((aq))^(2+)+2e^(-) RARR Ni_((s))`
`Cr_((aq))^(2+)+3e^(-) rarr Cr_((s))`
The above reaction indicates that 2F charge is required to deposit 58.7g of Nickel from nickel nitrate and 3F charge is required to deposit 52g of chromium.
Given that 2.935 gram of Nickel is depostied
`therefore` The amount of charge PASSED through the cell
`=(2F)/(58.7g) TIMES 2.935`
`=0.1F`
`therefore` if 0.1 F charge is passed through chromium nitrate the amount of chromium DEPOSITED
`=(52g)/(3F) times 0.1F`
`=1.733g`
Discussion
17884.

The reagents which can not be used to distinguish ethanol acetone is :

Answer»

SCHIFF's REAGENT
FEHLING's solution
ceric AMMONIUM nitrate
iodine withNaOH

Solution :N//A
Discussion
17885.

XeF_(6)+3H_(2)Orarr P+6HF What is P?

Answer»

SOLUTION :`XeO_(3)` or Xenon TRI OXIDE.
Discussion
17886.

The salt of strong acid and strong base does not undergo hydrolysis. Explain

Answer»

Solution :(i) In this CASE, neither the cations nor the anions undergo hydrolysis. Therefore the solution remains neutral.
(ii) For example in the aqueous solution of NaCl, its ions `Na^+ and Cl^-` ions have no tendency to react with `H^+ or OH^-` ions of water. This is because the POSSIBLE PRODUCTS of such reaction are NaOH and HCl which are COMPLETELY dissociated. As a result, there is no change in the concentration of `H^+ and OH^-` ions and hence the solution CONTINUES to remain neutral.
Discussion
17887.

Which will have maximum pH?

Answer»

DISTILLED water
`1M NH_3`
1 M NAOH
Water saturated by chlorine

Solution :`NaOH` has MAXIMUM `[OH^-]` and MINIMUM of `[H^+]` and so maximum pH value.
Discussion
17888.

Which of the following compounds be detected by Molisch's test ?

Answer»

SUGARS
Amines
Primary ALCOHOLS
NITRO COMPOUNDS

Answer :A
Discussion
17889.

Write the ionic reaction for the reaction between MnO_4^(-) ions and oxalate ions at 333 K.

Answer»

Solution :`2MnO_(4)^(-) + 16H^(+) + 5C_2O_(4)^(2-) overset(333 K) RARR 2MN^(2+)+8H_2O + 10 CO_2`
Discussion
17890.

which of the following reactions depicts the reducing action of H_(2)O_(2)?

Answer»

`2MnO_(4)^(-) + 6H^(+) + 5H_(2)O_(2) to 2Mn^(2+) + 5O_(2) + 8H_(2)O`
`2I^(-) + 2H^(+) + H_(2)O_(2) to I_(2) + H_(2)O`
`C_(6)H_(6) + H_(2)O_(2) to C_(6)H_(5)OH + H_(2)O`
`PbS + 4H_(2)O_(2) to PbSO_(4) + 4H_(2)O`

SOLUTION :`2MnO_(4)^(-)+6H^(+)+5H_(2)O_(2)rarr 2Mn^(+)+8H_(2)O+5O_(2)`
`or 2KMnO_(4)+3H_(2)SO_(4)+5H_(2)O_(2)rarr K_(2)SO_(4)+2MnSO_(4)+8H_(2)O+5O_(2)`
Discussion
17891.

Write the structures of the following compounds 1-Bromo-4-sec butyl-2-methylbenzene

Answer»

SOLUTION :
Discussion
17892.

The SI unit of molar conductivity is

Answer»

`S cm^(2)"MOL"^(-1)`
`S "DM"^(2)"mol"^(-1)`
`SM^(2)`
`S m^(2) "mol"^(-1)`

ANSWER :A::B::D
Discussion
17893.

The vapour density of an organic compound is 23.0. It contains 52.17% C and 13% H. It gives iodoform test. The compound is :

Answer»

Ethanol
dimethyl ether
Acetone
Methanol

Answer :A
Discussion
17894.

Which is a wrong statement?

Answer»

Rate CONSTANT, k = ARRHENIUS constant A: if `E_(a)`=0
`e^(-E_(a),//RT)` gives the fraction of REACTANT molecules that are activated at the given temperature.
In k vs `l/T` plot is a STRAIGHT line.
presence of catalyst will not alter the VALUE of `E_(a)`.

Answer :D
Discussion
17895.

Which process is used for the purification of Zirconium ?

Answer»

MOND PROCESS
Van Arkel
HALL- Heroult
NONE of the above.

Answer :B
Discussion
17896.

Which is correct in case of van der Waal's adsorption ?

Answer»

HIGH TEMPERATURE, LOW pressure
Low temperature, high pressure
Low temperature, low pressure
High temperature, high pressure

Answer :B
Discussion
17897.

Which of the following pair(s) is/are incorrectly matched? (i) R (resistance) -ohm (Omega) (ii) rho (resistivity)-ohm metre (Omegam) (iii) G (conductance)- seim ens or ohm (S) (iv) k (conducjtivity)-scimens metre"^(-1) (SM^(-1))

Answer»

`(i), (ii) and (ii)`
`(ii) and (iii)`
`(i), (ii) and (iv)`
`(iii)` only

SOLUTION :Correct matching for pair (iii) will be
[G (conductance)- SIEMENS of `OHM^(-1)(S).`]
Discussion
17898.

Which is fat soluble vitamin:

Answer»

VITAMIN A
Pyridoxine
Riboflavin
Thiamine

Answer :A
Discussion
17899.

When the new enzyme is synthesized ?

Answer»

When body degrade the enzyme INHIBITOR complex.
When there is no enzyme in body
When body degrade competitive inhibitors
When RECEPTOR not work. 

SOLUTION :When body degrade the enzyme inhibitor complex
Discussion
17900.

Write the postulates of Werner's theory.

Answer»

Solution :`(i)` The central metal ion in any complex ion/compound exhibits two types of valencies, these are (a) Primary valency (b) Secondary valency.
`(ii)` The primary valency is ionisable and corresponds to the OXIDATION state of the metal joining the centralion
`(iii)` The secondary valency is non-ionisable. Every central ion has a fixed number of secondary valencies. This number is called the coordination number of the central ion.
`(iv)` The primary valency of the metal ion is always SATISFIED by a negative ion. The attachment of the central metal ion to the negative ligand is shown by dotted lines.
`(v)` The secondary valencies are satisfied by either negative ions are neutral molecules .The secondary valencies are shown by their lines. The molecules or ions that satisfy secondary valency are called ligands.
`(vi)` The ligands which satisfy the secondary valencies must POINT out in the definite directions in space. Whereas the primary valencies are non-directional in nature. The spatial arrangement of the secondary valencies around the central metal ion is called coordination polyhedron.
`(VII)` The secondary valencies are responsible for isomerism in the coordination compounds.
`(viii)` Werner.s REPRESENTATION of `[Co(NH_(3))_(6)]Cl_(3)`
Discussion