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12851.

Which one of the following will give carbylamine test ?

Answer»

`NH_2CONH_2`
`CH_3CONH_2`
`C_2H_5NH_2`
all of these

Answer :C
Discussion
12852.

The reagent that does not react with both acetone and benzaldehyde is ________.

Answer»

SODIUM HYDROGEN SUPHITE
Fehling's solution
Hydrazine
Semicarbazide

ANSWER :B
Discussion
12853.

Which of the following can show tautomerism here.

Answer»




Both B and C

Answer :D
Discussion
12854.

Which of the following reaction is used to make a fuel cell

Answer»

`Cd_((s))+2Ni(OH)_(3(s))toCdO_((s))+2Ni(OH)+H_(2)O_((L))`
`Pb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq))to2PbSO_(4(s))+2H_(2)O_((l))`
`2H_(2(g))+O_(2(g))to2H_(2)O_((l))`
`2Fe_((s))+O_(2(g))+4H_((aq))^(+)to2Fe_((aq))^(2+)+2H_(2)O_((l))`

SOLUTION :Overall reaction `-2H_(2(g))+O_(2(g))to2H_(2)O_((l))`
Discussion
12855.

What will be the emf of given cell - Pt |H_(2) (P_(1)) | H_((aq))^(+) | | H_(2)(P_(2))|Pt ?

Answer»

`(RT)/(2F) "LOG"_(e) (P_(1))/(P_(2))`
`(RT)/(F) "log"_(e) (P_(1))/(P_(2))`
`(RT)/(F) "log"_(e) (P_(2))/(P_(1))`
`(RT)/(2F) "log"_(e)(P_(2))/(P_(1))`

Solution :At anode , `H_(2)(P_(1)) to 2 H^(+) + 2E^(-)`
At cathode ` 2H^(+) + 2e to H_(2)(P_(2))`
`E_("cathode") = (-RT)/(2F) "ln" (P_(2))/([H^(+)]^(2))` and
`E_("anode") = (-RT)/(2F) "ln" ([H^(+)]^(2))/(P_(1))`
Discussion
12856.

Three arrangements are shown for the complexes [CoBr_(2)(NH_(3))_(2)(en)]^(o+). Which one is wrong statement?

Answer»

I and II are GEOMETRICAL ISOMERS
II and III are optically ACTIVE isomers
I and III are optically active isomers
II and III are geometrical isomers

Solution :II and III are geometrical isomers as II is TRANS while III is CIS of the given complex.
Discussion
12857.

Two students use same stoch solution of ZnSO_(4) and a solution of CuSO_(4). The e.m.f. of one cell is 0.03 V higher than the other. The concentration of CuSO_(4) in the cell with higher e.m.f. value is 0.5 M. find out the concentration of CuSO_(4) in the other cell (2.303RT/F=0.06)

Answer»

Solution :The TWO cells may represented as
`Zn|Zn^(2+)(conc=c)||Cu^(2+)(c=?)|Cu,EMF=E_(1)`
`Zn|Zn^(2+)(conc.=c)||Cu^(2+)(0.5M)|Cu,EMF=E_(2)`
The CELL reaction is: `Zn+Cu^(2+)toZn^(2+)+Cu`
`thereforeE_(1)=E^(@)-(2.303RT)/(2F)"log"(c)/([Cu^(2+)])`
`E_(2)=E^(@)-(2.303RT)/(2F)"log"(c)/(0.5)`
`thereforeE_(2)-E_(1)=(2.303RT)/(2F)("log"(c)/([Cu^(2)])-"log"(c)/(0.5))=0.03V` (given)
`THEREFORE(0.06)/(2)"log"(0.5)/([Cu^(2+)])=0.03` or `"log"(0.5)/([Cu^(2+)])=1` or `(0.5)/([Cu^(2+)])=10` or `[Cu^(2+)]=(0.5)/(10)=0.05M`
Discussion
12858.

Which statements is incorrect with reference to inner transition elements?

Answer»

Pm is radioactive element among actinoids
Only in the electronic configuration of lanthanoids lke CE, GD and Lu the electrons are filled in 5d orbitals
The values of ionisation ENTHALPY of actinoids are less than the values of ionisation enthalpy of lanthanoids
The oxides of lanthanoids are basic

Solution :Pm does not BELONGS to actinoids series
Discussion
12859.

Which of the following vitamins contains isoprene unit:

Answer»

A
C
`B_2`
D

Answer :A
Discussion
12860.

Which of the following curves is in accordance with Freundlich adsorption isotherm ?

Answer»




ANSWER :C
Discussion
12861.

The vapour pressure of acetone at 20^(@)C is 185 torr. When 1.2 g of a non-volatile was dissolved in 100 g of acetone at 20^(@)C, its vapour pressure was 183 torr. The molar mass ("g mol"^(-1)) of the substance is

Answer»

128
488
32
64

Solution :`(p^(@)-p_(s))/(p^(@))=(n_(2))/(n_(1))=(w_(2)//M_(2))/(w_(1)//M_(1))=(185-183)/(185)=(1.2//M_(2))/(100//58)`
`("Molar mass of "CH_(3)COCH_(3)="58 G MOL"^(-1))`
`=(1.2xx58)/(100xxM_(2)) or M_(2)=(1.2xx58)/(100)xx(185)/(2)`
`="64.38 g mol"^(-1)`
Discussion
12862.

Which of the following statements are incorrect? (P) In HCN liquid, hydrogen bonding is present. (Q) HBr_(2)^(-) does exist. (R) In P(CH_(3))_(3)(CF_(3))_(2) number of maximum atoms may lie in one plane is 6. (S) In solid PCl_(5), the maximum number of equal angles is 12.

Answer»

<P>Q, R, S
Q, R
R, S
S,P

Solution :`HBr_(2)^(-)` does not exist and in `P(CH_(3))_(3)(CF_(3))_(2)`,
7 atoms MAY lie in one plane.
(P) `H-C-=N…H-C-=N…`
Discussion
12863.

Which is the true covalent oxide of iodine:

Answer»

`I_2O_4`
`I_2O_5`
`I_2O_8`
`I_4O_9`

ANSWER :B
Discussion
12864.

Which among the following reactions is involved for the removal of permanent hardness by anion exchanger resi n:

Answer»

`Na_(2)Al_(2)Si_(2)O_(8).xH_(2)O+MG^(2+)rarr`Product
`Na_(2)[Na_(4)(PO_(3))_(6)]+Mg^(2+)rarr`Product
`R-NH_(3)^(+)OH^(-)+SO_(4)^(2-)rarr` Product
`Na_(2)CO_3+Ca^(2+)rarr` Product

Solution :`underset("Resin")(2RNH_(3)^(+)OH^(-))+SO_(4)^(2-)to(RNH_(3))_(2)SO_(4)+2OH^(-)`
Discussion
12865.

xA + yB to zC. (Here x, y, zare simplest whole number rations) If -(d[A])/(dt) =- (d[B])/(dt) = 1.5 (d[C])/(dt)="then"x+y+z is :

Answer»


ANSWER :8
Discussion
12866.

Which of the following conducts electricity in the fused state

Answer»

`BeCl_(2)`
`MgCl_(2)`
`SrCl_(2)`
`BaCl_2`

Solution :Generally `MgCl_2,SrCl_(2),BaCl_(2)` are ionic compounds so they CONDUCT electricity in fused state.
Discussion
12867.

What is glycogen ?

Answer»


ANSWER :The FORMULA of GLYCOGEN is `(C_6H_10O_5)`. It is an ANIMAL POLYSACCHARIDE.
Discussion
12868.

What happens when ? (i) Cumene hydroperocide is treated with dilute (H_(2)SO_(4)). (ii) Phenol is distilled with C C l_(4) in presenceof aqueous NaOH. (iii) Phenol is distilled with phthalic anhydride in the presence of concentration H_(2)SO_(4). (iv) Benzenediazonium chloride is treated with alkaline ice-cold aqueous solution of phenol. (v) Phenol reacts with acetic anhydride in presence of sodium acetate. (vi) Phenol is heated with ammonia in presence of anhydrous ZnCl_(2) at 573K. (vii) Phenol is refluxed with con. H_(2)SO_(4) at 373K. (viii) Phenol condenses with excess of formaldehyde in presence of sodium hydroxide for a long period. (ix) 2,4,6-Trinitrophenol is heated with zinc dust. (x) Phenol reacts with benzoyl in presence of NaOH. (xi ) Phenol is treated with neutral FeCl_(3). (xii) Phenol is treated with bromine water. (xiii) Phenol is treated with conc. HNO_(30 in presence of conc. H_(2)SO_(4). (xiv) Phenol is treated with methyl chloride in presence of anhydrous AlCl_(3) (xv) Phenol is hydrogenated in presence of nickel catalyst at 473K-533K.

Answer»

Solution :[Hint]

(iii) Phenolphthalein.
(iv) p-Hydroxyazonbenzene (coupling reaction)
(v) Phenyl ethanoate ( an ester ) .
(VI) Aniline.
(vii) 4-Hydroxybenzenesulphonic ACID.
(viii) Bakelite (polymer)
(ix) 1,3,5-Trinitrobenzene
(X) Phenylbenzoate.
(xi) Violet coloured complex
(xii) 2,4,6-Tribromophenol.
(xiii) 2,4,6-Trinitrophenol (PICRIC acid)
(xiv) 4- Methylphenol (p-Cresol).
(xv) Cyclohexanol (`C_(6)H_(11)OH)`.
Discussion
12869.

Under what conditions will a system be in themodynamic equilibrium?

Answer»

SOLUTION :A system will be INI a thermodynamic equilibrium if it simultaneously maintains MECHANICAL equilibrium, thermal equilibrium and CHEMICAL equilibrium.
Discussion
12870.

Write one difference in the following : Homogeneous catalysis and heterogeneous catalysis

Answer»

SOLUTION :Homogeneous CATALYSIS and heterogeneous catalysis : In homogeneous catalysis, the catalyst and the reactants are in the same phase or physical state (liquid or solid). In heterogeneous catalysis, the catalyst and the reactants are in DIFFERENT PHASES or physical states.
Discussion
12871.

Write one difference in the following : Homogeneous catalysis and Heterogeneous catalysis.

Answer»

SOLUTION :Homogeneous catalysis and Heterogeneous catalysis : The catalytic process in which the REACTANTS and the catalyst are in the same PHASE (liquid or gas) is called homogeneous catalysis. The catalytic process in which the reactants and catalyst are not in the same phase (PHYSICAL STATE) is called heterogeneous catalysis.
Discussion
12872.

When plants and animals decay, the organic nitrogen is converted into inorganic nitrogen. The inorganic nitrogen is in the form of

Answer»

AMMONIA
elements of NITROGEN
nitrates
nitrides.

Solution :The inorganic nitrogen exists in the FORM of ammonia, which may be lost as gas to the atmosphere, may be acted UPON by nitrifying bacteria, or may be taken up directly by plants
Discussion
12873.

Which of the following is not purified by zone refining process?

Answer»

Ge
Si
Ga
Al

Answer :D
Discussion
12874.

What will be the number of spectral lines in infrared region when electron transition occur from n=7 to n=2 in hydrogen atom :-

Answer»

`5`
`10`
`15`
Zero

Solution :`N//A`
Discussion
12875.

Which of the followingpairs of substances on reaction will not evolve H_(2) gas

Answer»

FE and `H_(2)SO_(4)` (aqueous)
COPPER and HCl (aqueous)
SODIUM and ethyl alcohol
Iron and steam

Answer :B
Discussion
12876.

Which of the following has shortest carbon-carbon bond length ?

Answer»

`C_6H_6 `
`C_2H_6 `
`C_2H_4 `
` C_2H_2 `

ANSWER :D
Discussion
12877.

The temperature of a gas placed in an open container from 27^(@)C to 227^(@)C. The prevent of the original amount of the gas expelled from the container will be:

Answer»

20
40
60
80

Solution :Open container `rArr P & V` is constant
So, nT=constant
`n_(i)(300)=n_(F)=(500)`
`n_(f)=(3)/(5)n_(i)`
`n_(i)=n_(f)+n_("escape")`
`n_("escape")=(2)/(5)n_(i)rArr 40%`
Discussion
12878.

Which of the following carbanions are not resonance stabilized?

Answer»




SOLUTION :BD
Discussion
12879.

When an excess of a very dilute aqueous solution of KI is added to a very dilute aqueous solution of silver nitrate, the colloidal particles of silver iodide are associated with which of the following Helmholtz double layer ?

Answer»

`Ag:Ag^(+):I^(-)`
`AgI:K^(+):NO_(3)^(-)`
`AgI:NO_(3)^(-):Ag^(+)`
`AgI:I^(-):K^(+)`

Solution :As excess of KI has been added,` I^(-)` ions are adsorbed on AgI FORMING a fixed layer (and giving it a negative charge). It then atracts the counter ions `(K^(+))` from the medium forming a SECOND layer (DIFFUSED layer).`
Discussion
12880.

Which one is found in AlP ribonucleotide'

Answer»

GUANINE
URACIL
ADENINE
INULIN

ANSWER :C
Discussion
12881.

Which of the following reactions is not correctly matched ?

Answer»

`2C_(2)H_(5)Br+2Na overset("dry ether")rarr C_(4)H_(10)+2NaBr` : WURTZ REACTION
`CH_(3)Br+AgF rarr CH_(3)F+AgBr` : Etard reaction
`C_(6)H_(5)Br+2Na+BrC_(2)H_(5)overset("dry ether")rarr C_(6)H_(5)C_(2)H_(5)+2NaBr` : Wurtz-Fitting reaction
`2C_(6)H_(5)Br+2Na overset("dry ether")rarr C_(6)H_(5)-C_(6)H_(5)+2NaBr` : Fitting reaction

Solution :It is known as Wwarth reaction.
Discussion
12882.

Which of the following statements is true about electronegativity?

Answer»

Electronegativity of an element depends UPON its effective nuclear CHARGE
Electronegativity of a cation is proportional to charge on the cation
Electronegativity INCREASES as the s-character in hybrid orbital increases
Electronegativity of a ANION is proportiona to charge on the anion

Answer :A::B::C
Discussion
12883.

The variation of (p)/((x//m)) as a function of p when Lanmuir's is isotherm is valid is :

Answer»




SOLUTION :N//A
Discussion
12884.

When I is oxidised by MnO_(4), in alkaline medium, I converts into

Answer»

` I0_(3) `
`I_(2)`
`IO_(4)`
`IO`

Solution : `2K_(2)MnO_(4) + 2KOH to 2K_(2)MnO_(4) + H_(2)O +O`
`2K_(2),MnO_(4), +2H_(2),O to 2MnO_(2), +4KOH+ 20`
`2KMnO_(4), +H_(2)Ooverset(alkaline) to 2MnO_(2) + 2KOH+3[O]`
`KI+[O] to KIO_(3)`
2KMnO_(4) +KI+H_(2)O to 2KOH + 2MnO_(2) +KIO_(3)`
Honce, (B) is the CORRECT answer
Discussion
12885.

What is the oxidation state of phosphorous element in cyclometa phosphoric acid ?

Answer»

`+3`
`+5`
`-3`
`+2`

ANSWER :B
Discussion
12886.

Whatmass of slaked lime would be required to decompose completely 4 grams of ammonium chloride and what would be the mass of each product?

Answer»

Solution :The equation representing the decomposition of `NH_(4)CL` by slaked time, i.e., `Ca(OH)_(2)` is :
`{:(Ca(OH)_(2),+,2NH_(4)Cl,rarr,CaCl_(2),+,2NH_(3),+,2H_(2)O),(40+2(1+16),,2(14+4+35.5),,40+2xx35.5,,2(14+3xx1),,2(2xx1+16)),(=74g,,=107g,,=111g,,=34g,,=36g):}`
(i) To calculate the mass of `Ca(OH)_(2)` required ot decompose 4 g `NH_(4)Cl`.
From the above equation, 107 g of `NH_(4)Cl` are decomposed by 74 g of `Ca(OH)_(2)`
THEREFORE` 4G` of `NH_(4)Cl` will be decomposed by `Ca(OH)_(2)=(74)/(107)xx4=2.766 g`
Thus, the mass of slaked lime required = 2.766 g.
(ii) To calculate the slaked lime required = 2.766 g.
107 g of `NH_(4)Cl` when reacted with `Ca(OH)_(2)` produce 111 g of `CaCl_(2)`.
`therefore" 4 g of "NH_(4)Cl` when reacted with `Ca(OH)_(2)` produce `CaCl_(2)=(111)/(107)xx4=4.15 g`
Hence, the mass of `CaCl_(2)` produced = 4.15 g.
(iii) To calculate the mass of `NH_(3)` produced.
107 g of `NH_(4)Cl` react with `Ca(OH)_(2)` to give 34 g of `NH_(3)`.
`therefore" 4g of "NH_(4)Cl` react with `Ca(OH)_(2)` to give produce `NH_(3)=(34)/(107)xx4=1.271 g`
Hence, the mass of `NH_(3)` produced = 1.271 g.
(iv) To calculate the mass of `H_(2)O` formed.
107 g of `NH_(4)Cl` react with `Ca(OH)_(2)` to yield 36 g of `H_(2)O`
`therefore` 4 g of `NH_(2)Cl` react with `Ca(OH)_(2)` to yield `H_(2)O=(36)/(107)xx4=1.3458 g`
So the mass of `H_(2)O` formed = 1.3458 g.
Discussion
12887.

Which one of the following is formed when Butyl magnesium bromide is treated with propanone followed by hydrolysis?

Answer»

TERTIARY BUTYL ALCOHOL
ISOPROPYL alcohol
2-methyl hexan-2-ol
Propan-1-ol

SOLUTION : 2-methyl hexan-2-ol
Discussion
12888.

Which one of the following conditions will favour maximum formation of the product in the reaction, A_(2)(g)+B_(2)(g)hArrX_(2)(g)Delta_(r)H=-XkJ?

Answer»

<P>Low temperature and high pressure
Low temperatue and low pressure
High temperatue and high pressure
High temperature and low pressure

Solution :For reaction `DeltaH=-veand Deltan_(G)=-ve`
`therefore` High P, Low T, favour PRODUCT FORMATION.
Discussion
12889.

Which reaction occurs at the fastest rate ?

Answer»




ANSWER :A
Discussion
12890.

When a metal rod M is dipped into an aqueous colourless concentreted solution ofcompound N, the solution tuns light blue. Addition ofaqueousn NaCI to the blue solution gives a white precipitate 'O'. Addition ofaqueous NH_3 dissolves 'O' gives an intese blue solution The compund N is

Answer»

`AgNO_3`
`ZN(NO_3)_2`
`AL(NO_3)_3`
`PD(NO_3)_2`

Solution :
Discussion
12891.

When a metal rod M is dipped into an aqueous colourless concentreted solution ofcompound N, the solution tuns light blue. Addition ofaqueousn NaCI to the blue solution gives a white precipitate 'O'. Addition ofaqueous NH_3 dissolves 'O' gives an intese blue solution The metal rod M is

Answer»

Fe
Cu
Ni
Co

Solution :
Discussion
12892.

Which is useful for separating benzoic acid frommethyl benzoate?

Answer»

`NaHCO_3(AQ)`
DIL. HCI
Dil. `H_2SO_4`
Dil. `HNO_3`

ANSWER :A
Discussion
12893.

Which of the following gives M^(3+) ion most readily:

Answer»

P
N
Sn
As

Answer :B
Discussion
12894.

Which are functional isomers :

Answer»

Methanol and methoxy methane
Ethyl ALCOHOL and ether
ACETONE and acetaldehyde
N-methylethanamine and N, N- dimethyl-methanamine

Answer :D
Discussion
12895.

Which of the following repressents correct dissociation of nitrate salts on heating

Answer»

`2LiNO_(3) RARR Li_(2)O + 2NO_(2) + (1)/(2)O_(2)`
`Pb(NO_(3))_(2) rarr PbO + 2NO_(2) + (1)/(2) O_(2)`
`NH_(4)NO_(3) rarr N_(2)O + 2H_(2)O`
`NH_(4)NO_(2) rarr N_(2) + 2H_(2)O`

ANSWER :A::B::C::D
Discussion
12896.

Which of the following is NOT TRUE for wilkinson catalyst

Answer»

Hybridization of CENTRAL metal atom is `dsp^(2)`
OVERALL molecule is non planar
cis form is used for HYDROGENATION of alkenes
Repelled by magnetic field

Answer :C
Discussion
12897.

Which would undergo S_(N) 2 reaction faster in the following pair and why ? CH_(3) - CH_(2) - Br " and " CH_(3) - underset(Br)underset(|)overset(CH_(3))overset(|)C - CH_(3)

Answer»

Solution :`CH_(3)- CH_(2) - Br` would undergo `S_(N)2`REACTION faster because the NUCLEOPHILE would not face steric HINDRANCE.
Discussion
12898.

Which one of the following is called 3 – oxopentanal?

Answer»

`C_6H_5 - undersetoverset(||)(O)(C ) - C_6H_5`
`CH_3CH_2 - undersetoverset(||)(O)(C ) - CH_2-CHO`
`(CH_3)_2C = CHCOCH_3`
`C_6H_5CH=CH - CHO`

SOLUTION :`CH_3CH_2 - undersetoverset(||)(O)(C ) - CH_2-CHO`
Discussion
12899.

To which ring size cycloalkanes, Baeyer's strain theory is not valid ?

Answer»

3 CARBON
4 carbon
5 carbon
`GE`6 carbon

Answer :D
Discussion
12900.

Which statement is not true among the following :

Answer»

AMINES are bases
They turn red litmus blue
Trimethyl amine is less BASIC than DIMETHYL amine
Amines yield alkanols on AQUEOUS hydrolysis

Answer :D
Discussion