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14301.

Which is not the property of ethanenitrile (CH_(3)CN)

Answer»

Undergoes acidic hydrolysis to give carboxylic acid
Undergoes ALKALINE hydrolysis to give salt of carboxylic acid
It tautomerises to give methyl isocyanide
It gives carbylamine reaction with CHLOROFORM

Solution :Carbylamine reaction is given by ALIPHATIC and aromatic PRIMARY AMINE.
`CH_(3)CN` does not give carbylamine reaction with chloroform because it is not an amine.
`CH_(3)CN` undergoes acidic hydrolysis to give carboxylic acid.
`CH_(3)CNoverset(H_(2)O //H^(+))rarrCH_(3)CONH_(2)overset(H_(2)O //H^(+))rarrCH_(3)COOH+NH_(3)`
`CH_(3)CN` undergoes alkaline hydrolysis to give salt of carboxylic acid.
`CH_(3)CN` tautomerises to give methyl isocyanide
`CH_(3)-C=NhArrC=N-CH_(3)`
Discussion
14302.

Which p-orbitals overlapping would give the strongest bond?

Answer»




ANSWER :C
Discussion
14303.

Which occurs to minmum extent in nature

Answer»

`Ag_(2)S`
`H_(2)S`
`Bi_(2)S_(3)`
`Cs_(2)`

ANSWER :d
Discussion
14304.

Which of the following gives ketone on oxidation

Answer»

`(CH_(3))_(3)COH`
`CH_(3)CH_(2)CH_(2)OH`
`(CH_(3))_(2)CHCH_(2)OH`
`CH_(3)CHOHCH_(3)`

Solution :`CH_(3)-underset(OH)underset(|)CH-CH_(3)overset([O])to CH_(3)-underset(O)underset(||)C-CH_(3)`
Discussion
14305.

Which of the following has the least boiling point ?

Answer»

n-Hexane
n-Pentane
2-Methyl butane
2, 2-Dimethylpropane

Solution :Branching of chain makes the molecule more compact and THEREFORE, decreases the surface area. As a result of decreased surface area, intermolecular attractive FORCES BECOME less and boilling point ALSO decreases.
Discussion
14306.

Which among the following can exhibit cis-trans isomerism

Answer»

`CoCl_(3).4NH_(3)`
`CoCl_(3).6NH_(3)`
`CoCl_(3).5NH_(3)`
All of these

Answer :A
Discussion
14307.

Write the monomers of the following : (i) Teflon (ii) Cellulose (iii) Neoprene (iv) Polythene.

Answer»

SOLUTION :
Discussion
14308.

The the reaction CH_(3)CHOoverset(PCl_(5))rarrXoverset(aq.KOH)rarrY,Y is

Answer»

Ethyne
Ethanediol
Ethene
Ethanal

Solution :`CH_(3)CHOoverset(PCl_(5))rarrCH_(3)CHCl_(2)overset("AQ. KOH")rarrCH_(3)CH(OH)_(2)rarrunderset("Ethanal")(CH_(3)CHO)`
Discussion
14309.

Which of the following is the weakest acid

Answer»

`HF`
`HCL`
`HBR`
`HI`

SOLUTION :HF has high bond DISSOCIATION energy.
Discussion
14310.

Which of the following complex has the highest stability constant at 298 K

Answer»

`[Cdcl_(4)]^(2-)`
`(CD(Br)_(4)]^(2-)`
`[CdI_(4)]^(2-)`
`[Cu(CN)_(4)]^(2-)`

Solution :As `CN^(-)` is strongest ligand it will form the most stable complex.
Hence, (D) is the correct
Discussion
14311.

What is the value equilibrium constant if E_(cell)^(@)=0?

Answer»

SOLUTION :`E^(@)=(0.0591)/(n)LOGK" or "=(0.0591)/(n)logK`
`K=0 "or "K=" Anti " LOG 0=1`.
Discussion
14312.

Write the structure of the main products of following reactions:

Answer»

SOLUTION :
Discussion
14313.

What happens when ethanol is treated with conc. H_(2)SO_(4) at 443 K ?

Answer»

Solution :`C_(2)H_(4)` is obtained.
`C_(2)H_(5)OH overset("Conc. "H_(2)SO_(4))UNDERSET(443 K)rarr C_(2)H_(4)+H_(2)O`.
Discussion
14314.

Which compound will absorb the maximum amount of heat when dissolved in the same amount of water ? (Integral heats of solution at 25^(@)C in kcal/mol of each solute are given in brackets)

Answer»

`HNO_(3)(DeltaH=-33)`
`KCL(DeltaH=+17.64)`
`NH_(4)NO_(3)(DeltaH=+25.5)`
`HCl(DeltaH=-74.1)`

Solution :More +ve is `DeltaH_(s)` more is HEAT of solution
Discussion
14315.

Two containers are connected by stopcock as shown. If initially P_(O_(2))=P_(He)=P when stopcock is closed. Then after opening the stopcock (alter a long time keeping initial temperature in each same as initially).

Answer»

<P>`P_("final")=P`
`P_(O_(2))=(P)/(2)`
`P_(He)=P`
`T=600K`

Solution :After opening the stopcock (for long TIME)
`n'_(1)+n'_(2)=n_(1)+n_(2)`
`(P_(f)xx10)/(Rxx300)+(P_(f)xx20)/(Rxx600)=(Pxx10)/(300R)+(Pxx20)/(600R)`
For `O_(2) & He` before MIXING
`(P_(O_(2))V_(O_(2)))/(n_(O_(2))T_(O_(2)))=(P_(He)V_(He))/(n_(He)T_(He))`
`T=T_(He)=600K`
For `O_(2)` in `1^(st)` container and `2^(nd)` container its MOLE distribution
`(Pxx10)/(Pxx20)=((n_(O_(2)))_(1)xxRxx300)/((n_(O_(2)))_(2)xxRxx600)`
`(n_(O_(2)))_(1)=(n_(O_(2)))_(2)=(X)/(2)`
Similarily `(n_(O_(2)))_(1)=(X)/(2)`
Partial pressure of `O_(2)` in any container `P_(O_(2))=x_(O_(2))P_("total")`
`P_(O_(2))=(X//2)/(X)P=(P)/(2)`
Partial pressure of He in any container `P_(He)=P-P_(O_(2))=(P)/(2)`
T=600K
A,B,D
Discussion
14316.

Which of the following is low spin complex

Answer»

`[NiCl_4]^(2-)`
`[CoF_6]^(3-)`
`[Ni(CN)_4]^(2-)`
`[MnCl_4]^(2-)`

Answer :C
Discussion
14317.

What is saturated solution?

Answer»

SOLUTION :A solution in which ono more solute can be DISSOLVED at the same TEMPERATURE and pressure is CALLED a saturated solution.
Discussion
14318.

Write electronic configuration, calculate magnetic moment and predict magnetic properties of some 3d element ions.

Answer»

SOLUTION :
Discussion
14319.

What type of isomerism is exhibited by the complex [Co(en)_(3)]^(3+) ? (en = ethane-1, 2-diamine)

Answer»

Solution :`[CO(en)_(3)]^(3+)` exhibits OPTICAL ISOMERISM.
Discussion
14320.

Whichg of the following hydrides has the lowest boiling point?

Answer»

`H_(2)O`
`H_(2)S`
`H_(2)SE`
`H_(2)TE`

Solution :`{:(,H_(2)O,H_(2)S,H_(2)Se,H_(2)Te),(,373K,213K,269K, 232K):}`
`H_(2)S` has lowest boiling point and `H_(2)O` has HIGHEST boiling point because due to highest boiling point of `H_(2)O` is high.
Discussion
14321.

When a solution of conductance 1.342 mho "metre"^(-1) was placed in a conductivity cell with parallel electrodes, the resistance was found to be 170.5 oh. The area of the electrodes is 1.86 xx 10^(-4) sq metre. Calculate the distance between the two electrodes in metres.

Answer»

SOLUTION :`4.25 XX 10^(-2)` METRES
Discussion
14322.

Which one of the following anions is present in the chain structure of silicates?

Answer»

`(Si_(2)O_(5)^(2-))_(N)`
`(SiO_(3)^(2-))_(n)`
`SiO_(4)^(4-)`
`Si_(2)O_(7)^(6-)`.

SOLUTION :Chain silicates CONTAIN `(SiO_(3)^(2-))_(n)` units.
Discussion
14323.

What is an adsorption isotherm? Discuss the phenomenon of adsorption of gases on solids with the help of Freundllich adsorption isotherm.

Answer»

Solution :Adsorption ISOTHERM: The variation in the amount of gas adsorbed by the adsorbent with pressure at constant TEMPRETURE can be expressed by means of a curve known as adsorption isotherm.
`to` freundlich adsorption isotherm equation is
`(x)/(m)=k,p^(l//n)`
x=mass of the gas adsorbed
m= massof the adsorbent
p,k and n are constansts.
`to`k and n depend on the nature of the adsorbent and the gas at a paraticular tempreture .
`to` The relation ship is genrally represnted in the from of a curve where x/m is PLOTTED against pressure.
`to`These curves indicate that a fixed pressure there is a decrease in physical adsroption with rise of TEMPRATURE.
`(x)/(m)=k.p^(1//4)`
Applying logarithm
`Log ""(x)/(m) = log K + (1)/(n) log P`
`to` The validity of Freumdllich isotherm can be verified by plotting log`(x)/(m)`on y-axis and log p on x-axis. If is a straight LINE thenthe isothern is valid.
`to` The slope of the straight line give the value of `1/n`
`to` The intercept on the y-axis the value of log K.

Discussion
14324.

The secondary valence of Pt^(4+) is six. Calculate the number of moles of AgCl participated, when excess of AgNO_3 solution is added to 2L of 0.1M PtCl_4. 4NH_3solution.

Answer»

Solution :Secondary valence of `Pt^(4+)` is six and it will be SATISFIED by four `NH_(3)` and two `CI^(-)` IONS. The remaining two `CL^(-)` ions satisfy only primary valence. `PtCl_(4).4NH_(3)` can be written as `[Pt(NH_(3))_(4)Cl_(2)]Cl_(2)`.
One mole of this complex GIVES 2 moles of chloride ions in the aqueous solution.
Number of moles of complex present in 2L of 0.1M `PtCl_(4).4NH_(3)=MxxV=0.1xx2=0.2`
Number of moles of chloride ions present in 2L of 0.1M `PtCl_(4).4NH_(3)` solution `= 2 xx0.2 = 0.4`.
Number of moles of AgCl precipitated from 2L of 0.1 M `PtCl_(4).4NH_(3)` is 0.4.
Discussion
14325.

Whichgroup - 15 elementshas thelowestionisationenthalpy ?

Answer»


ANSWER :BI;
Discussion
14326.

Which allotrope of sulfur exists in the form of zig-zag chains of sulfur atoms?

Answer»

SOLUTION :PLASTIC SULFUR
Discussion
14327.

Write IUPAC name of [Pt(NH_(3))_(2)Cl_(2)].

Answer»

SOLUTION :diamminedichloridoplatinum (II).
Discussion
14328.

Which of the following is correct about lyophillic sol?

Answer»

They are irreversible
They are FORMED by inorganic substances
They are readily co-ogulated by ADDITION of electrolytes
They are SELF stablised

Answer :D
Discussion
14329.

Which is used to preserve biological specimens ?

Answer»

Acetone
Chloroform
Ethanal
Formaldehyde.

Answer :D
Discussion
14330.

Which one of the following process is used to distinguish between the three types of alcohols?

Answer»

Reduction
Hydrolysis
Oxidation
Hydrogenation

Answer :C
Discussion
14331.

Which of the following is/are not lyophobic in nature?

Answer»

`AS_(2)S_(3)`
Sulphur
Starch
Protein

Answer :C::D
Discussion
14332.

Using option how many total number of statements are correct. (I) H-bond is also a one type of dipole-dipole interaction. (II) Hybrid orbital always form sigma bond (III) If molecule is polar then it must be planar. (IV) If bond is polar then compound must be polar. (V) In chloral hydrate molecule intramolecular H-bond is present. (VI) More electronegati ve element alswayshas more electron affinity (VII) Hardness present in water is due to presence of D_(2)O. (VIII) Order of boiling point H_(2)ltD_(2)ltT_(2). (IX)

Answer»

Solution :(I) TRUE (II) False (III) False (IV) False (V) True (VI) False (VII) False (VIII) True (IX) True
Discussion
14333.

Which of the followingis incorrect combination ?

Answer»

(I) (III) (R )
(II) (i) (P)
(III) (i) (S)
(IV) (iv) (Q)

Solution :N/A
Discussion
14334.

Which of the following does NOT result in increase in the entropy?

Answer»

CRYSTALLIZATION of SUCROSE from solution
Rusting of iron
Conversion of ICE to water.
Vaporization of camphor

Answer :A
Discussion
14335.

What is the oxidation potential of given hydrogen half cel at 1 bar pressure and 25^(@)C temperature? Pt|underset("1 bar")(H_(2(g)))|HCl_((aq))pH=3

Answer»

`0.059V`
`0.188V`
`0.177V`
`0.000`V

Solution :`Pt|underset(1" BAR")(H_(2(g))|HCl_((aq))pH=3`
So, `[H^(+)]=1xx10^(-3)M=0.001M`
And reaction : `underset("1 bar")(H_(2(g))) to underset(0.001M)(2H_((aq))^(+))+2e`
According to Nernest.s formula,
`E_(CELL)=E_(H^(+)//H_(2))^(Theta)-(0.059)/(n)"log"([H^(+)]^(2))/([H_(2)])`
`=0.0-(0.059)/(2)"log"((0.001)^(2))/(1)`
`=0.0295xx(-6.0)`
`=+0.177V`
Discussion
14336.

Whichof thefollowingisomericheptanes canyieldsevendiffernetmonochlorinatedproducts upon free radicalchorination ?

Answer»

2,3 Dimethypentane
2,2-Dimehtylpentane
3- METHYLHEXANE
2- methylhexane

ANSWER :C
Discussion
14337.

Which one of following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid ?

Answer»

Phenol
Benzoic acid
Butanal
Benzaldehyde

Answer :D
Discussion
14338.

Write expression for half-life in case of a reaction between hydrogen and chlorine to form hydrochloric acid gas.

Answer»

SOLUTION :Given reaction is a reaction of ZERO order. HENCE, `t_(1//2)=[A]_(0)//2" K (page 4/24)".`
Discussion
14339.

Which of the following metal is thrown as anode mud during electrolytic refining of copper?

Answer»

Zn
Fe
Ag
Ni

Answer :C
Discussion
14340.

Which can be used to prepare methane?

Answer»

CLEMMENSEN reduction
Wurtz reaction
Catalytic hydrogenation of METHYL IODIDE
Reduction of methyl iodide using Zn-Cu couple

Answer :A::B::C::D
Discussion
14341.

Which of the following halogens has basic properties :

Answer»

Fluorine
Chlorine
Bromine
Iodine

Answer :D
Discussion
14342.

Which one of the following complex ions has geometrical isomers? (en = ethylenediamine)

Answer»

`[Ni(NH_(3))_(5)Br]^(+)`
`[CO(NH_(3))_(2)(en)_(2)]^(3+)`
`[Cr(NH_(3))_(4)(en)]^(3+)`
`[Co(en)_(3)]^(3+)`

SOLUTION :`[Co(NH_(3))_(2)(en)_(2)]^(3+)` shows GEOMETRICAL isomerism.
Discussion
14343.

Which of the following is incorrect? 1) Catalyst undergoes permanent chemical change 2) Particle size of solute in true solutions is 10^(3-)m 3) Starch solution is a hydrosol 4) Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions

Answer»

1, 2 and 3
2 and 3
1, 2 and 4
2, 3 and 4

ANSWER :C
Discussion
14344.

When 1.0 g of a non-volatie solute was dissolved in 10 g benzene, elevation in boiling point temperature was found to be 1^(@)C. Calculate the molar mass of the dissoved substance. (K_(b) "for benzene = 2.53 K kg" mol^(-1)).

Answer»


Solution :`W_(B)=1.0g, W_(A)=10g=0.01 kg`
`DeltaT_(b)=1^(@)C or 1 K, K_(b)=2.53" K kg MOL"^(-1)`
`M_(B)=(K_(b)xxW_(B))/(DeltaT_(b)xxW_(A))=((2.53" K kg mol"^(-1))xx(1.0 G))/((1 K)xx(0.01" kg"))=253" g mol"^(-1)`
Discussion
14345.

The total number of Aldols (beta-Hydroxy carbonyl compounds) are formed in te following reaction. (ignore stereoisomers) PhCHO+CH_(2)CH=O+Ph-underset(O)underset(||)C-CH_(3)overset(Dil.NaOHDelta)to

Answer»

Solution :`PhCHO+CH_(3)CH=)+Ph-underset(O)underset(C)-CH_(3)overset(DIL NAOH,DELTA)to`
Total 6 aldol products
Discussion
14346.

underset("monochlorination")overset(Cl_2,hv)toA=no . Of total monochloroproducts (with stereo isomers).

Answer»


SOLUTION :
Discussion
14347.

Which alkali metal is most metallic in character

Answer»

Li
Na
K
Cs

Answer :D
Discussion
14348.

Write the structural formula and IUPAC names of all isomeric amines with molecular formula C_3 H_9 N. Which out of these will give carbylamine reaction ?

Answer»

SOLUTION : The three isomeric amines are:
(i) `CH_3CH_2CH_2 NH_2` (1-Propanamine)
(ii) `CH_3NHC_2H_5`(N-Methylethanamine)
(iii)`(CH_3)_3N` (N, N-Dimethylmethanamine)
Only 1-propanamine (`1^@`amine) will give carbylamine reaction.
Discussion
14349.

Tranquilizers affect

Answer»

stomatch
kindeny
liver
central nerveous system

Answer :D
Discussion
14350.

The van't Hoff 's factor (i) for a 0.2 molal aqueous solution of urea is

Answer»

`0.2`
`0.1`
`1.2`
`1.0`

Solution :UREA does not undergo dissociation or ASSOCIATION. Hence, van't Hoff factor (i)=1.
Discussion