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22101.

What is the co - ordination number of Fe in [FeCl_(2)(en)_(2)]Cl?

Answer»

SOLUTION :Here en is bidentate
`Clrarr` UNIDENTATE
Hence the coordination NUMBER of `FE` is six.
Discussion
22102.

What is meant by the term‘broad spectrum antibiotics’ ? Explain.

Answer»

Solution :Antibiotics which KILLS or inhibits WIDE range of BACTERIA.
Discussion
22103.

When 1-pentyne (A) is formed with 4N alcoholic KOH at 175^(@) C, it is converted into an equilibrium mixture of 1.3% 1-pentyne (A), 95.2 % 2-pentyne (B) and 3.5% of 1.2 pentadierie (C ). The equilibrium is maintained at 175^(@) C. Calculate DeltaG_(2)^(@) for the following equilibria. B

Answer»


ANSWER :`0012`
Discussion
22104.

Which of the following change the colour of aqueous solution of FeCl_(3)?

Answer»

`K_(4)[FE(CN)_(6)]`
`H_(2)S`
`NH_(4)CNS`
KCNS

Solution :A) `K_(4)(Fe(CN)_(6)) overset(Fe^(3+))to` Prussian blue
B) `H_(2)S overset(Fe^(3+))to` Oxidized to sulphere
C and D `Fe^(3+)3+ScNO to underset("Blood red colour")([Fe(SCN)_(3)])`
Discussion
22105.

What volume of O_2 is soluble in 100 cm^3 of water at 293 K.

Answer»

`3.08 CC`
`30.8 cm^3`
`1.02 cm^3`
`4.2 cm^3`

ANSWER :A
Discussion
22106.

Why a solution of [Ni(H_(2)O)_(6)]^(2+) is green while a solution of (Ni(CN)_(4)]^(2-) is colourless ?

Answer»

SOLUTION :`[Ni(H_(2)O)_(6)]^(2+)` is an octahedral COMPLEX while `[Ni(CN)_(4)]^(2-)` is a SQUARE planar complex. The two complexes are associated with different crystal field SPLITTING. The two compounds give different colours in d-d transition.
Discussion
22107.

The structure of the product P of the following reaction is

Answer»




ANSWER :C
Discussion
22108.

Which reaction sequence would be best to prepare 3-chloroanilne from benzene ?

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Chlorination, nitration, reduction
Nitration, chlorination, reduction
Nitration, reduction, chlorination
Nitration, reduction, acetylation, chlorination, hydrolysis

Solution :
(i)In CASE chlorination is done EARLIER than nitration, CHLOROBENZENE formed at first step would introduce `NO_2` group in ortho-position, not in m-position
(ii) Again if -`NO_2` group is REDUCED earlier than the chlorination step, -`NH_2` group formed on reduction will again introduce -Clin o-position
Discussion
22109.

(W) and (X) are optically active isomers of C_(5)H_(9)Cl (W) on treatment with one mole of H_(2) is converted to an optically inactive compound (Y). But (X) gives an optically active compound (Z) under the same conditions Give the structure of (Y) and configuration of (W),(X) and (Z) in Fischer projections.

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SOLUTION :
Discussion
22110.

Which of the following has no action with starch solution:

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`F_2 and Cl_2`
`Br_2`
`I_2`
None

Answer :A
Discussion
22111.

Which of the following will not function as a buffer solution

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NaCl and NaOH
NaOH and `NH_(4)OH`
`CH_(3)COONH_(4)` and HCl
Borax and boric ACID

Solution :Because BUFFER solution are MIXTURE of weak acid or weak base and their SALT.
Discussion
22112.

What happens when bromobenzene is boiled with 50% NaOH solution?

Answer»

SOLUTION :No REACTION TAKES PLACE.
Discussion
22113.

Which of the following gives rise to the formation of bond ?

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ANSWER :B
Discussion
22114.

Which of the following species does / do not exist ?

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`OF_(4)`
`NH_(2)^(-)`
`NCl_(5)`
`IC l_(3)^(2-)`

Answer :A::C::D
Discussion
22115.

Which of the statements (s) is/are not true?

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On passing `H_(2)S`through acidifid `K_(2)Cr_(2)O_(7)`solution, a milky colour is obseved
`Na_(2)Cr_(2)O_(7)` is preferred over `K_(2)Cr_(2)O_(7)` in volumetric analysis
`K_(2)Cr_(2)O_(7)` solution in acidic medium is orenge
`K_(2)Cr_(2)O_(7)`solution becomes yellow on increasing the pH beyond 7

Solution :Being HYGROSCOPIC, sodium DICHROMATE , `Na_(2)Cr_(2)O_(7)` cannot ne USED in volumetric analyasis.
All other given statements are true.
Discussion
22116.

The type of activity of disinfectants is checked by which microorganism ? (A)

Answer»

SALMONELLA typhosa 
Bacterio spermum 
PENICILLIUM notetum 
FUNGI 

SOLUTION :Salmonella typhosa
Discussion
22117.

Which of the following statements about (+) (-) sucrose is not correct ?

Answer»

it does not POSSES a FREE aldehydic (or) ketonicgroup
on hydrolysis , it PRODUCE invert SUGAR
it is an a -D-Glucoside
it UNDERGOES mutarotation

Answer :D
Discussion
22118.

Which of the following compounds is NOT a vitamin ?

Answer»

NICOTINAMIDE
THIAMINE
Testosterone
RIBOFLAVIN

ANSWER :C
Discussion
22119.

Which of the following pair has maximum number of unpaired electrons?

Answer»

`MN^(2+), FE^(3 +)`
`Co^(3 +), Fe^(2 +)`
`Cr^(3 +), Mn^(4 +)`
`Ti^(2 +), V^(3 +)`

Solution :`Mn^(2+), Fe^(3 +)`
Discussion
22120.

When 10 ampere current is passed for 80 min., volume of H_(2) gas liberated is

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`4.5 dm^(3)`
`5.5 dm^(3)`
`5.57 dm^(3)`
`6.2 dm^(3)`

Solution :QUANTITY of ELECTRICITY =Q=Ampere`xx`Second
`therefore Q=10xx80xx60=48000` COULOMB
`11.2 dm^(3) `of `H_(2)` LIBERATED by 96500 coulomb of electricity. Therefore `x dm^(3)` of `H_(2)` liberated by 4800 coulomb of electricity .
`therefore x=11.2xx4800//96500=5.57`
Discussion
22121.

The reagents, NH_4Cl and aqueous NH_3 will precipitate will recinitate

Answer»

 `CA^(2+)`
`Al^(3+)`
`BI^(3+)`
`MG^(2+)`

Answer :A::B
Discussion
22122.

Three element A,B and C crystallise into a cubic solid lattice. Atoms A occupy the corners, B occupy the cube centres and C occupy the edges. The formula of the compound is :

Answer»

ABC
`ABC_(2)`
`ABC_(3)`
`ABC_(4)`

Solution :No. of .A. ATOMS `= ( 1)/( 8 ) XX 8 = 1 `
No. of .B. atoms `= 1 xx1= 1 `
No. of .C. atoms `= ( 1)/( 4) xx 12 = 3 `
FORMULA `= ABC_(3)`
Discussion
22123.

Which of the following compound has the smallest (X-A-X) bond angle in each series repectively. (A)OsF_(2), OsCl_(2), OsBr_(2) (B) SbCl_(3), SbBr_(3), SbI_(3) (C) Pl_(3),AsI_(3),SbI_(3)

Answer»

`OSF_(2),SbCl_(3) and PI_(3)`
`OSBr_(2), SbI_(3) and PI_(3)`
`OSF_(2),SbI_(3) and PI_(3)`
`OSF_(2),SbCl_(3) and SbI_(3)`

SOLUTION :ORDER of decreasing bond angle.
Discussion
22124.

Which one of the following is not used to purify colloids?

Answer»

Dialysis
PEPTISATION
ELECTRO dialysis
Ultrafilteration

Solution :Peptisation
Discussion
22125.

Which of the following can exhibit cis-trans isomerism?

Answer»

`CH_(3)-CH(Cl)COOH`
`H-C-=C-Cl`
`ClCH=CHCl`
`ClCH_(2)-CH_(2)-Cl`

Answer :C
Discussion
22126.

Which of the following has + I effect ?

Answer»

`O^(-)`
`(CH_(3))_(3)C-`
`CH_(3)`
F

Answer :D
Discussion
22127.

Which of the following is a neutral polymer ?

Answer»

Polyethylene
Nylon
Protein
Terylene

Answer :C
Discussion
22128.

Which of the anhydrous salts when come in contact with water turns blue

Answer»

Ferrous SULPHATE
Copper sulphate
Znic sulphate
Cobalt sulphate

Solution :CU(II) COMPLEXES are blue. The four water MOLECULES are attached with secondary valencies of the metal atom e.g. `[Cu(H_(2)O)_(4)] SO_(4).H_(2)O`.
Discussion
22129.

The species H_2O,HCO_3^(-), HSO_4^(-) and NH_3 can act both as Bronsted acid and base. For each case, given the corresponding conjugate acid and base.

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SOLUTION :
Discussion
22130.

Which will not give acetamide (no heating ) onreaction with ammonia:

Answer»

ACETIC ACID
ACETYL chloride
Acetic anhydride
methyl acetate

Answer :A
Discussion
22131.

Which of the following is first antibiotic ?

Answer»

Halinin
Chloramphenicol
Tetracyclin
Penicillin 

ANSWER :D
Discussion
22132.

Which one of the following statements is not true at room temperature and pressure?

Answer»

`p_(4) O_(10)` is a white solid.
`SO_(2)` is a colourless GAS.
`SO_(3)` is a colourless gas.
`NO_(2)` is a brown gas.

Solution :`SO_3` is a colourless gas, but TRANSPARENT crystalline solid at room TEMPERATURE.
Discussion
22133.

What is beta-elimination reaction ?

Answer»

Solution :When an alkyl HALIDE is heated with an alcoholic solution of KOH, it loses a molecule of hydrogen `"halide"_(HX)` to GIVE an ALKENE. This reaction is called dehydrohalogenation or `beta`-elimination reaction.
e.g.
`underset("ETHYL CHLORIDE")(underset(H)underset(|)CH_(2))-underset(Cl)underset(|)CH_(2)+underset("(alc.)")KOH overset(Delta)to underset("Ethene")CH_(2)=CH_(2)+KCl+ H_(2)O`
Discussion
22134.

Which is/are correct statements about the role of a catalyst in a reaction?

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It is reactant in a rate-determining step and then a product of some subsequent step.
It provides an alternate mechanism with a fower energy of activation.
It increases the rate of CHEMICAL reaction but does not itself undergo a permanent CHANGE during the course of the reaction.
ENZYME catalysts are protein MOLECULES.

Solution :N//A
Discussion
22135.

Which one is water-soluble:

Answer»

`MgSo_4`
`BeSo_4`
`CaSo_4`
All

Answer :D
Discussion
22136.

Which of the following factors is responsible for the property of fluorine as strong oxidising agent ?

Answer»

ELECTRON affinity
Ionisation enthalpy
Hydration enthalpy
Bond DISSOCIATION energy

Answer :C
Discussion
22137.

The yellow precipitate formed during the chromyl chloride test in chemically

Answer»

chromic acid
lead chromate
lead ACETATE
SODIUM chromate

Solution :Yellow precipitate FORMED during chromyl chloride test in DUE to `PbCrO_(4)`.
Discussion
22138.

Which of the following is the ore of zinc?

Answer»

BAUXITE
Magnetite
Malachite
Calamine

Answer :D
Discussion
22139.

What are essential and non-essential amino acids ? Give two examples of each type.

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Solution :`alpha`-AMINO acids which are needed for health and growth of HUMAN beings but are not synthesised by the human BODY are called essential amino acids. For example, VALINE, leucine, arginine, etc. On the other hand, c-amino acids which are needed for health and growth of human beings and are synthesised by the human body are called non-essential amino acids. For example, glycine, alanine, glutamine, etc.
Discussion
22140.

Which one is the strongest base?

Answer»

`AsH_3`
`NH_3`
`PH_3`
`SbH_3`

ANSWER :B
Discussion
22141.

Which colligative property is more useful to determine the molecular weight of the substances like proteins and polymers ?

Answer»

Lowering of vapour pressure.
Elevation in boiling POINT.
DEPRESSION of FREEZING point.
Osmotic pressure.

Answer :D
Discussion
22142.

Which one of the following is the formula of chromyl chloride?

Answer»

`CrOCl_(2)`
`CrCl_(3)`
`CrO_(2)Cl_(2)`
`CrCl_(2)`

SOLUTION :`CrO_(2)Cl_(2)`
Discussion
22143.

Which of the following alkenes when passed through conc. H_(2)SO_(4) followed by hydrolysis with boiling water would give tert-butyl alcohol ?

Answer»

Ethylene
Isobutylene
PROPYLENE
1-Butene.

ANSWER :B
Discussion
22144.

Why are interhalogen compounds more reactive than halogens ?

Answer»

SOLUTION :This is because the interhalogen COMPOUNDS are polar and have lower BOND energies as COMPARED to halogen.
Discussion
22145.

Write resonance structures of arenium ions with : (i) NO_(2)^(o+).(ii) overset(o+)CH_(3)

Answer»


SOLUTION :N//A
Discussion
22146.

Which is strongest acidic?

Answer»

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

ANSWER :C
Discussion
22147.

When a sulphur sol is evaporated sulphur is obtained.On mixing with water sulphur sol is not formed.The sol is

Answer»

lyophilic
reversible
hydrophobic
hydrophilic

Solution :The colloidal solution in which the particles of the dispersal phase have no AFFINITY (rather have HATRED) for the DISPERSION MEDIUM is called lyophobic colloid.If the dispersion medium is water , then it is called hydrphobic colloid.
Discussion
22148.

What are reaction involved in the reductive removal removal of nitro group from an aromatic compound?

Answer»

Solution :`underset("Nitrobenzene")(C_(6)H_(5)-NO_(2)) underset("Reduction")overset(Sn//HCl)to underset("Aniline")(C_(6)H_(5)-NH_(2)) underset(("Diazotization"))overset(NaNO_(2)//HCl,273-278K)to underset("BENZENEDIAZONIUM chloride")(C_(6)H_(5)-overset(+)(N)-=NCl^(-)) underset(("Reduction"))overset(Aq.H_(3)PO_(2)//CU^(+))to underset(C_(6)H_(6))`
Discussion
22149.

What is the charge in coulomb of Fe^(3+) ion

Answer»

`6.4xx10^(19)C`
`8XX10^(-19)C`
`1.6xx10^(-19)C`
`4.8xx10^(-19)C`

ANSWER :D
Discussion
22150.

Two half-reactions of an electrochemical cell are given below : MnO_(4)^(-)(aq) + 8H^(+) (aq) + 5e^(-) toMn^(2+) (aq) + 4H2_O (I), E° = 1.51 V Sn^(2+) (aq) toSn^(4+) (aq) + 2e^(-) E° = + 0.15 V. Construct the redox reaction equation from the two half-reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured.

Answer»

Solution :`MnO_(4)^(-) (aq) + 8H^(+) (aq)+ 5e^(-) to Mn^(2+)(aq) + 4H_(2)O (l), E^(@) = +1.51 V`………..(i)
`Sn^(2+)(aq) to Sn^(4-) (aq) + 2E^(-), E^(@) = +0.15 V`……(ii)
Multiply EQUATION (i) by 2 and equation (ii) by 5, we have
`2MnO_(4)^(-) (aq) + 16H^(+) (aq) to 2Mn^(2+)(aq) + 8H_(2)O (l), E^(@) =+1.51 V`
`5Sn^(2+)(aq) to 5Sn^(4+) (aq) + 10E^(-), E^(@) = +0.15 V`
Adding equation (i) and (ii), we GET
`5Sn^(2+) (aq)to 5Sn^(4+) (aq) to 2Mn^(2+) (aq) + 5Sn^(4+)(aq) + 8H_(2)O (l) E^(@) = +1.66 V`
As the value is +ve, the reaction is PRODUCT favoured.
Discussion