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18201.

Which change in [Mn(CN)_(6)]^(4-) results in symmetrical ditribution of electrons in non-degenerate d- orbitals of metal ion ? (P) [Mn(CN)_(6)]^(4-)underset(byO_(2))overset("oxidation")to [Mn(CN)_(6)]^(3-) (Q) [Mn(CN)_(6)]^(4-)underset(by Zn)overset("reduction")to [Mn(CN)_(6)]^(5-)

Answer»

<P>P only
Q only
P and Q both
None of these

Solution :`[overset(+2)Mn(CN)_(6)]^(5-) implies d^(5), t_(2G)^(2, 2, 2)e_(G)^(0, 0)`
`[overset(+1)Mn(CN)_(6)]^(5-) implies d^(6), t_(2g)^(2, 1, 1)e_(g)^(1, 1)`
[Due to low O.S. of `Mn(+1) Delta_(0) lt P`, hence, pairing does not occur.]
Discussion
18202.

Which of the following would enable you to remove SO_(4)^(2-) ions from a mixture of C_2O_(4)^(2-), and Cl^(-) ions?

Answer»

NaOH
KOH
`BA(OH)_2`
 `BaSO_4`

ANSWER :C
Discussion
18203.

Which Fischer structure represents the open chain form of the following two anomers ?

Answer»




ANSWER :D
Discussion
18204.

Which vitamin gets destroyed on heating ?

Answer»

E
C
K
A

Answer :D
Discussion
18205.

What will be the parital pressure of He and O_(2) respectively , if 200 ml of He at 0.66 atm and 400ml at O_(2) at 0.52 atm pressure are mixed in 400 ml vessel at 20^(@)C.

Answer»

0.33 and 0.56
0.33 and 0.52
0.38 and 0.52
0.25 and 0.45

Solution :`PV=nRT`
`n_(He)=(0.66xx200)/(RT )`
`n_(O_(2))=(0.52xx400)/(RT)`
`PV=nRT`
`P=((n_(He)+n_(O_(2)))RT)/(400)`
`P_(T)=(0.66xx200+400xx0.52)/(400)`
`:' X_(He)=(n_(He))/(n_(O_(2))+n_(He))`
`X_(He)=(0.66 xx 200)/(0.66 xx200+400xx0.52)=(132)/(132+208)`
`P_(He)=X_(He)P_(T)=(132)/(340)xx(340)/(400)implies P_(He)=0.33`
`X_(O_(2))=(208)/(400)`
So, `P_(O_(2))=0.52`
Discussion
18206.

The term invert sugar refers to an equimolar mixture

Answer»

D-Glucose and D-galactose
D-Glucose and D-fructose
D-Glucose and D-mannose
D-Glucose and D-ribose.

Solution :D-Glucose and D-Fructose.
Discussion
18207.

Which one of the following compounds most readily undergoes substitution by S_(N)2 mechanism?

Answer»

`CH_(3)CH_(2)CL`
`CH_(3)-OVERSET(CH_(3))overset("|")(CH)CH_(2)Cl`
`CH_(3)-UNDERSET(C_(2)H_(5))underset("|")(CH)-Cl`
`CH_(3)-underset(CH_(3))underset("|")overset(CH_(3))overset("|")("C ")-Cl`

Answer :A
Discussion
18208.

When Br_2 is treated with aqueous solutions of NaF, NaCl and NaI separately

Answer»

`F_(2),Cl_(2) ` and `I_(2)` are LIBERATED
Only `F_(2)` and `Cl_(2)` are liberated
Only `I_(2)` is liberated
Only `Cl_(2)` is liberated

SOLUTION :`Br_(2)` reacts with NaI only to get `I_(2)`.
`2NaI + Br_(2) to 2Na Br +I_(2)`
Discussion
18209.

Which of the following most readily undergoes hydrolysis ?

Answer»




SOLUTION :It is more ELECTRON DEFICIENT and carbonly CARBON.
Discussion
18210.

The value of Delta G^@ for formation of Cr_2O_3 is -540 kJ mol^(-1) and that of Al_2O_3 is -827 kJ mol^(-1). Is the reduction of Cr_2O_3 possible with Al ?

Answer»

Solution :`4/3 Al_((s)) + O_(2(g)) to 2/3 Al_2O_(3(s)) , Delta_f G^(@) = -827 kJ "".....(i)`
`4/3 Cr_((s)) + O_(2(g)) to 2/3 Cr_(2)O_(3(s)) , Delta_f G^@ = -540kJ "" ....(II)`
Subtracting EQUATION (ii) from (i) we get,
`4/3 Al_((s)) + 2/3 Cr_(2)O_(3(s)) to 2/3 Al_2O_(3(s)) + 4/3Cr_((s))`
`Delta_f G^@ = -287 kJ mol^(-1) "" .....(iii)`
SINCE net `Delta_fG^@` is negative, the reaction is thermodynamically feasible and therefore AL can reduce `Cr_2O_3`.
Discussion
18211.

What is secondary cell ? Give examples of it.

Answer»

SOLUTION :* A SECONDARY cell after USE can be recharged by passing current through it in the opposite directio so that it can be used again.
* (i) A GOOD secondary cell can undergo a large number of discharging and charging cycles.
*(ii) The most important secondary cell is the LEAD storage cell and Ni-Cd cell.
Discussion
18212.

What product is obtained when acetophenone is treated with hydrazine hydrate and KOH at 453-473K?

Answer»

SOLUTION :ketones are reduced to hydrocarbons.
`UNDERSET("ACETOPHENONE")(C_(6)H_(5)COCH_(3)) underset(("Wolff-Kishner reduction"))overset(NH_(2)NH_(2).H_(2)O,KOH," ethylene glycol, 453-473K")to underset("Ethylbenzene")(C_(6)H_(5)CH_(2)CH_(3))`
Discussion
18213.

Which of the following is man-made element?

Answer»

Ra
U
Np
C

Solution :The ELEMENTS present after URANIUM in the Periodic Table are synthesised artificially by nuclear reactions. Hence, these are called SYNTHETIC or MAN made elements. hence, Np is a man-made element.
Discussion
18214.

What is condensation polymer ? Give example.

Answer»

SOLUTION :condensation POLYMER : The polymer which is formed by the condensation polymer.
E.g. NYLON 6,6 poly ethylene TEREPHTHALATE.
Discussion
18215.

Which metal is extracted by a reduction process :

Answer»

Na
Al
Fe
Mg

Answer :C
Discussion
18216.

When equal weights of methyl alcohol and ethyl alcohol react with excess of sodium metal, the volume of H_(2) liberated is more in the case of

Answer»

`C_2H_5OH`
`CH_3OH`
EQUAL in both
`H_2` is not LIBERATED

ANSWER :B
Discussion
18217.

Which of the following is a highly deliquescent sold?

Answer»

`FeCl_(3)`
`FeSO_(4)`
`CuSO_(4)`
All of these

ANSWER :D
Discussion
18218.

The two functional groups present in a typical carbohydrate are :

Answer»

`-CHO` and `-COOH`
`GT C=O` and `-OH`
`-OH` and `-CHO`
`-OH` and `-COOH`

Solution :In a typical CARBOHYDRATE `-CHO` and `-OH` groups are present.
Discussion
18219.

Which of the following statementis not correct ?

Answer»

Lead(II) chloride is soluble in hot water and resppears on cooding
in dilute HCI TH E SOLUBILITY of `PbCI_(2`) is higher then the hot water
in concetrated `HCI,PbCI_(2)` is INSOLUBLE
Lead (II) chloride forms the complex are havingwhite ppt ?

Solution :The solubility of `PbCI_(2)` is alreadyvery LOW in water and is supporessed appreciably in the presence of dil `HCI`
`PbCI_(2) + "conc" HCIhArr[PbCI_(2)]^(2)` soluble complax
Discussion
18220.

What is the role of Bithional in toilet soups ?

Answer»

Solution :Bithionalacts as an ANTISEPTIC agent and REDUCES the ODOURS produced by bacterial DECOMPOSITION of organic matter on the skin.
Discussion
18221.

The reagent(s) for the following conversion :

Answer»

ALCOHOLIC KOH
alcoholic KOH followed by `NaNH_(2)`
aqueous KOH followed by `NaNH_(2)`
`Zn//CH_(3)OH`

Solution :The CONVERSION is carried out FIRST by treating with alc. KOH followed by `NaNH_(2)`.
Discussion
18222.

Which of the following products is/are correctly matched in the following reactions.

Answer»

`HCHOoverset(NaOD)toHCOONa+CH_3OD`
`HCDOoverset(NAOH)toDCOONa+CH_2DOH`
`HCDOoverset(NAOET)toDCOOEt+DCH_2ONa`
`D_2COoverset(NaOH)toDCOONa+CD_3OD`

SOLUTION :
Discussion
18223.

When aniline is nitratedwith nitrating mixturein ice cold condition , the major product obtained is ___________.

Answer»

p-nitroaniline
2,4-dinitroaniline
o-nitroaniline
m-nitroaniline

ANSWER :A
Discussion
18224.

Which of the following is not a basic flux ?

Answer»

`CaCO_3`
CAO
`SiO_2`
MgO

Answer :C
Discussion
18225.

Which is isomer ?

Answer»

ETHANOL and ethoxyethane
Methanol and methoxymethane
Propionic ACID and PROPYL acetate
Propanal and acetone

Answer :D
Discussion
18226.

Which is more basic in character?

Answer»

RbOH
KOH
LiOH
NaOH

Answer :A
Discussion
18227.

What are the different types of RNA found in a cell ?

Answer»

SOLUTION :`MRNA , RRNA , rRNA`
Discussion
18228.

Value of standard electrode potential for the oxidation of Cl^(-) ions is more positive than that of water, even then in the electrolysis of aqueous sodium chloride, why is Cl^(-)oxidised at anode instead of water ?

Answer»

Solution :Under the conditions of ELECTROLYSIS of aqueous sodium CHLORIDE, OXIDATION of water at ANODE requires over potential, HENCE `Cl^(-)` is oxidised instead of water.
Discussion
18229.

What happens when persistent dialysis of a colloidal solution is carried out ?

Answer»

Solution :The stability of a colloidal sol is due to the PRESENCE of a SMALL AMOUNT of the electrolyte. On persistent dialysis, the electrolyte is completely removed. As a result, the colloidal sol BECOMES UNSTABLE and gets coagulated.
Discussion
18230.

Total number of beta-keto monocarboxylic acids (including stereoisomers) which on heating give

Answer»


SOLUTION :
Discussion
18231.

Write the chemical reactions of the following conversions : (i) CH_3 - CH_2 - Clto CH_3 - CH_2 - CH_2 - NH_2 (ii) C_6H_5 - CH_2 - Cl to C_6 H_5 - CH_2 - CH_2 - NH_2

Answer»

Solution :(i) `CH_3 Cl + UNDERSET(("ALC"))(KCN) overset(Delta)to CH_3 CH_2 CN + KCl CH_3 CH_2 CN + 4(H) overset(Na//"ale")to CH_3 CH_2 -CH_2 - NH_2`
`(II) C_6 H_5 - CH_2 - Cl + underset("(ale)")(KCN) to C_2 H_5 - CH_2 CN + KCl C_6 H_5 CH_2 CN + 4(H) overset(Na//"ale")to C_6H_5 CH_2 NH_2`
Discussion
18232.

Using IUPAC norms write the formulas for the following: Hexaammineplatinum(IV)

Answer»

SOLUTION :`[Pt(NH_(3))_(6)]^(4+)`
Discussion
18233.

Which of the following is positional isomer of alpha-D glucose ?

Answer»




SOLUTION :N//A
Discussion
18234.

Van't Hoff factor(i):

Answer»

Is Less than ONE in CASE of dissociation
Is more than one in case of association
I = normal molecular mass / OBSERVED molecular mass
I = observed molecular mass / normal molecular mass

Answer :C
Discussion
18235.

Write the reaction between XeF_2 and KF ?

Answer»

SOLUTION :`XeF_4 + 4 KI RARR XE + 4KF + 2I_2`
Discussion
18236.

Which of the following are soures of antibiotcs?

Answer»

Bacteria
Moulds
fungi
All of these

Answer :D
Discussion
18237.

When AgNO_(3) solution is added in execss to 1lit. CoCl_(3),XNH_(3) solution, one mode of AgCl is formed,. What is the or x?

Answer»

1
2
3
4

Answer :D
Discussion
18238.

Which of the following alcohols does not give a red colour in Victor Meyer test-

Answer»

ISOBUTYL ALCOHOL
Isoamyl alcohol
Diethyl CARBINOL
Phenylcarbinol

ANSWER :C
Discussion
18239.

Which of the following has the largest de Broglie wavelength provided all have equal velocity?

Answer»

Carbon dioxide molecule
Ammonia molecule
nitrogen molecule
Oxygen molecule

Solution :`lamda=h/(mv)`
Since among these `NH_(3)` has smallest MASS, it will have largest DE -BROGLIE WAVELENGTH.
Discussion
18240.

Which of the following statements regarding sulphur dioxide is not true?

Answer»

`SO_(2)` is an ANGULAR molecule
`SO_(2)` MAY be regarded as the resonance hybrid of two CANONICAL structures
`SO_(2)` is anhydride of sulphuric acid
`SO_(2)` is anhydride of SULPHUROUS acid

Answer :C
Discussion
18241.

Which of the following statements are correct about HCOOH

Answer»

It is a stronger ACID than `CH_(3)COOH`
It forms formyl CHLORIDE with `PCl_(5)` It gives CO and `H_(2)O` on heating with conc. `H_(2)SO_(4)`
It REDUCES TOLLEN's reagent
Tert butyl benzene

Solution :Formyl chloride being unstable DECOMPOSES to form CO+HCl.
Discussion
18242.

Which of the following amines docs not react with Hinsbcrg's reagent?

Answer»

`CH_(3)CH_(2)NH_(2)`
`(CH_(3)CH_(2))_(2)NH`
`(CH_(3)CH_(2))_(3)N`
all will react .

SOLUTION :`3^(@)`Amines (i.e., `(CH_(3)CH_(2))_(3)N` in the PRESENT case) do not react with IIinsberg.s reagent SINCE they do not have a REPLACEABLE HYDROGEN on N-atom.
Discussion
18243.

Which halogen acid is a liquid:

Answer»

HF
HCl
HBr
HI

Answer :A
Discussion
18244.

Which one of the following formulae representsthe first order reaction ?

Answer»

`k=2.303/(t) log ([A])/([A]_0)`
`k=2.303/t log (a-x)/a`
`[A]=[A_0]E^(-KT)`
`k = 2.303/t log (a)/(a+x)`

Solution :For 1st ORDER reactions, `[A] = [A]_(0) e^(-kt)`
Discussion
18245.

Which is not member of vitamin B complex group :

Answer»

Retinol
Thiamine
Riboflavin
Pyridoxine

Answer :A
Discussion
18246.

The values of oxidation number of S in S_(8), S_(2) F_(2) and H_(2)S are respectively

Answer»

`-2, +1 and -2`
`-2, -1 and +2`
0, +1 and +2
0, +1 and -2

Solution :`S_(8) (0), S_(2)F_(2) (+1), H_(2)S(-2)`
Discussion
18247.

The tendencies of the electrodes made up of Cu,Zn and Ag to release electrons, when dipped in their respective salt solutions decreases in the order:ZngtAggtCu,CugtZngtAg,ZngtCugtAg,AggtCugtZn.

Answer»

`ZngtAggtCu`
`CugtZngtAg`
`ZngtCugtAg`
`AggtCugtZn`

ANSWER :C
Discussion
18248.

What is thepH of the buffer solutioncontaining0.15 mol of NH_(4)OHand 0.25 mol of NH_(4)Cl ?K_(b)for NH_(4)OH is 1.98 xx10^(-5)

Answer»

10
9
`9.2`
`10.2`

SOLUTION :`14 - PH = pK_(b) + log. (["SALT"])/(["Base"])`
` - log (1.98 xx10^(-5))+ log. ((0.25)/(0.15))`
`pH = 9 `
Discussion
18249.

Which reaction occurs at cathode during electrolysis of fused lead bromide :

Answer»

`PB rarrPb^(2+) +2e`
`Br +E rarrBr^-`
`Br^- rarrBr +e`
`Pb^(2+) +2e rarrPb`

ANSWER :D
Discussion
18250.

What is the normality of 250 mL. H_(2)SO_(4) having pH = 0.0 ?

Answer»

0.50 N
0.25 N
2 N
1 N

SOLUTION :`PH = 0 "" LOG[H^(+)]=0 "" [H^(+)] =1`
Molarity = 0.5M
Normality = 1 N
Discussion