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23351.

To make PVC a flexible plastic , the additive used is called:

Answer»

Filler
Antioxidant
Stabilizer
Plasticiser

Answer :D
Discussion
23352.

Which of the following molecules will not show optical activity?

Answer»




Solution :
It has a CENTRE of SYMMETRY and hence is optically INACTIVE.
Discussion
23353.

Which of the following can participate in linkage isomerism ?

Answer»

`NO_(2)^(-)`
`H_(2)overset(••)(N)CH_(2)CH_(2)overset(••)(N)H_(2)`
`H_(2)O`
`""_(•)^(•)NH_(3)`

SOLUTION :`NO_(2)^(-)` may be bonded to metal through NITROGEN (nitro) or through oxygen (nitro). Hence `NO_(2)^(-)` can participate in linkage isomerism.
`underset("cobalt (III) CHLORIDE")underset("pentaanminenitro")([(NH_(3))_(5)CoNO_(2)]Cl_(2))`and`underset("cobalt (III) chloride")underset("pentaamminenitro")([(NH_(3))_(5)CoONO]Cl_(2))`
Discussion
23354.

What is limiting molar conductivity? Represent graphically the variation in molar conductivity with concentration for acetic acid.

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SOLUTION :The conductivity of electrolytic solution at INFINITE solution is called LIMITING molar conductivity.
Discussion
23355.

What happens when NH_4NO_3 is heated ?

Answer»

SOLUTION :`NH_4NO_3 oversetDeltararr N_2O + 2H_2O`
Discussion
23356.

Which of not a food preservation ?

Answer»

ACETIC acid
Citric acid
Sodium benzoate
Sodium bicarbonate

Answer :D
Discussion
23357.

Which of the following compounds will form significant amount of meta product during mono-nitration reaction

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Solution :
REASON: Aniline in acidic MEDIUM converts into anilinium ion and it is meta DIRECTING so SIGNIFICANT amount of meta product is OBTAINED.
Discussion
23358.

Which of the following halides is most reactive towards nucleophilic substitution reactions ?

Answer»

`C_2H_5Br`
`C_2H_5Cl`
`C_2H_5F`
`C_2H_5I`

ANSWER :A
Discussion
23359.

Which of the following carbonyl compounds undergoes aldol condensation ?

Answer»

Benzaldehyde
Benzophenone
Acetophenone
tert-Butyl PHENYL ketone

Answer :A::C
Discussion
23360.

Which of the following is an isomer of CH_(3)CH_(2)CH_(2)CH_(2)OH?

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`CH_(3)CH_(2)CH_(2)OH`
`CH_(3)CH_(2)OCH_(3)`
`CH_(3)underset(OH)underset("|")(CH)CH_(2)CH_(3)`
`CH_(3)CH_(2)COCH_(3)`

ANSWER :C
Discussion
23361.

Write suitable reagent to distiguish the following compounds.

Answer»


SOLUTION :N//A
Discussion
23362.

What is the relation between normality and molarity of a given solution of H_(2)SO_(4)?

Answer»

SOLUTION :`"Mormality"=2XX"MOLARITY"`.
Discussion
23363.

Which has zero dipole moment

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Cis-2-butene
Trans-2-butene
1-butene
2-methyl-1-propene

Solution :
`MU = 0` SYMMETRICAL STRUCTURE.
Discussion
23364.

Which of the following polymer is an example of fibre ?

Answer»

SILK
DACRON
Nylon-6, 6
All of these

Solution :Silk is protein fibre. Dacron is polyester fibre and Nylon-6, 6 is polyamide fibre.
Discussion
23365.

What is the effect of temperature on the rate constant of a reaction ?How can this effect of temperature on rate constant be represented quantitatively?

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SOLUTION :The RATE constant of reaction increases of temperature and becomes nearly double.This increase is generally two fold for 10K rise in temperature.
The effect temperature on rate of reaction is given Quantitatively.According to Arrhenius equation .
`k=A e^(-E_(a)//RT)`
Where,A=Frequency factor constant
R=Gas constant
`E_(a)`=ACTIVATION energy
T=Temperature
Using the above equation we can calculate the activation energy TAKING logarithm on both SIDE.
Discussion
23366.

Which of the following metals requires radiation of highest frequency to cause emission of electrons?

Answer»

Na
Mg
K
Ca

Solution :Because it has HIGHEST ioisation ENTHALPY.
Discussion
23367.

Which of the following is/are correct reaction?

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`PhCH_(2)OME underset(/_\) overset(conc. HBR)to PhCH_(2)Br+MeBr`

SOLUTION :(A) & EtI obtained
(C) `HI` is ANHYD. So carbocation is not formed
(D) is formed
Discussion
23368.

Vapour densities of O_(2) and CH_(4) are 32 and 16 respectivley. The ratio of rate of diffusion of CH_(4) to that of O_(2) is

Answer»

`SQRT( 2) : 1 `
`1: sqrt( 2) `
`2: 1`
`1: 2`

SOLUTION :`( r ( CH_(4)))/( r( O_(2))) = sqrt((d ( O_(2)))/( d ( CH_(4)))) = sqrt(( 32 )/( 16)) = sqrt( 2) : 1 `
Discussion
23369.

Write the structure of the following compounds: (a)3-Hydroxypentane-2-sulphonic acid., (b)3-Oxopentanoic acid ( c)3-Chloromethylpentanoic acid , (d)2-Aminobutanamide (e)3-Bromobutanoyl chloride , (f)Ethyl methanoate (g)Cyclohexyl ethanoate , (h)Phemul ethanoate (i)2-Chloroethyl propanoate , (j)Diethyl pentanedioate (k)Dimethyl 3-oxopentanediate , (l)Methyl cyclohexanecarboxylate

Answer»


ANSWER :A::C::D
Discussion
23370.

What can be inferred from the magnetic moment values of the following camplex species? {:("Exampl e,,Magn etic Moment(BM)),(K_4[Mn(CN)_6],,2.2),([Fe(H_2O)_6],,5.3),(K_2(MnCl_4],,5.9):}

Answer»

SOLUTION :The value of magnetic MOMENT `(mu)` in `(BM)` are as follows:
When `n=1,mu=sqrt(3)=1.75`
`n=2,mu=sqrt(8)=2.76`
`n=3,mu=sqrt(15)=3.86`
`n=4,mu=sqrt(24)=4.80`
`n=5,mu=sqrt(35)=5.96`
(a). `K_4(Mn(CN)_6]^(4-),Mn^(2+)=3d^(5),mu=2.2BM`
`mu` value suggest that it has only ONE unpaired electron, which is due to the pairing of electrons by strong field `CN^(ɵ)` ligand.

(b). `[Fe(H_2O)_6]^(2+),Fe^(2+)=3d^(6),mu=5.3BM`
`mu` value suggest that it has 4 unpaired electrons. Since `H_2O` is a weak field ligand, thus no pairing of d-electrons occurs.

(c). `K_2[MnCl_4]Mn^(2+)=3d^(5),mu=5.92BM`
`mu` value suggests that it has 5 unpaired electrons. Since `Cl^(ɵ)` ion is a wak field ligand thus no pairing of d-electrons occurs.
Discussion
23371.

When (S)-2-methylbutan-1-ol is allowed to react with conc. HCl, (S)-1-chloro-2methylbutane is obtained. Explain with reason whether the reaction proceeds with inversion or retention of configuration.

Answer»

Solution :`##CHY_CHE_ORG_XII_P2_U10_E01_072_S01.png" WIDTH="80%">
In this reaction, bonds ATTACHED with chiral carbon ATOM are not broken. Thus, retention of configuration occurs.
Discussion
23372.

What is X in the following reaction?

Answer»

MgO
MG
`Mg(OH)_2`
`Mg(OH)CL`

SOLUTION :`MgCl_2+H_2Ooverset(Delta)toMgO+2HCl`
Discussion
23373.

Which of the following pairs of structures does not represent valid resontaing structures.

Answer»




ANSWER :A
Discussion
23374.

Which of the following compounds is the most reactive nucleophilic addtionreaction ?

Answer»

`OVERSET(O) overset(||) (CH_(3)-C-H)`
`overset(O) overset(||) (CH_(3)-C-H_(3))`

SOLUTION :`CH_(3)CHO` is the most reactive towards in nucleophilic addtion reaction.
Discussion
23375.

Which of the following are outer orbital octahedral complexes?

Answer»

`[FeF_(6)]^(3-)`
`[Fe(CN)_(6)]^(3-)`
`[Fe(CN)_(4)]^(2-)`
`[Fe(H_(2)O)_(6)]^(2+)`

Solution :
Discussion
23376.

What is the molecular mass of polymers ?

Answer»

`10^(3) - 10^(7)U`
`10^(7) - 10^(12)u`
`10^(8) – 10^(10)u`
NONE of these

Solution :`10^(3)-10^(7)`
Discussion
23377.

When an excess of a very dilute aqueous solution of KI is addd 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»

`AGI//Ag^(+):I^(-1)`
`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 attracts the counter ions `(K^(+))` from the MEDIUM forming a second layer (diffused layer).
Discussion
23378.

The reason for double helical structure of DNA is dueto the presence of

Answer»

ELECTROSTATIC attractions
van DER Waals' forces
dipole - dipole interactions
HYDROGEN-BONDING.

SOLUTION :Hydrogen bonding.
Discussion
23379.

Which of the following give (s) aniline by reduction of nitrobenzene?

Answer»

`H_(2)//Ni`
Sn/HCI
Zn & NAOH
`LiAlH_(4)`

Solution :
Discussion
23380.

Which of the following is used as indelible ink

Answer»

Aq. `CuSO_(4)` solution
Aq. `AgNO_(3)` solution
Aq. `NaCl` solution
Aq. `NAOH` solution

Solution :Indelible INK means ink that cannot be ERASED or washed away.
Discussion
23381.

What typeofstoichiometricdefect is shownby ZnS ?

Answer»

SOLUTION :FRENKEL DEFECT
Discussion
23382.

Which polyhalo compound is obtained by reduction of CHCl_(3) in presence of (Zn+HCl) ?

Answer»

`C Cl_(4)`
`CH_(2)Cl_(2)`
`CHI_(3)`
DDT

Answer :B
Discussion
23383.

Two acid solutions A and B are titrated separately each with 25 mL of 1NNa_(2)CO_(3) solution. The volume of each acid used for titration is 10 mL and 40 mL respectively for the complete neutralization. The volume ratio ofv_(B)and v_(A)which is mixed to prepare one mL 1N solution is……

Answer»


Solution :LET the NORMALITY of acid solution A be `N_(A)`and the normality of acid solution B be`N_(B)`
`N_(A) xx V_(A) = N_(Na_(2)CO_(3)) xx V_(Na_(2)CO_(3)) , N_(A) xx 10 = = 1 xx 25 rArr N_(A) = 2.5`
Similarly `N_(B) xx V_(B) = N_(Na_(2)CO_(3)) xx V_(Na_(2)CO_(3)) , N_(B) xx 40 = 1 xx 25 , N_(B) = (5)/(8) N`
`N_(A) Y_(A) + N_(B)V_(B) = 1 xx 1, (2.5 xx V_(A)) + (5)/(8) xx V_(B) = 1, V_(A) + V_(B) = 1, V_(A) = 1- V_(B)`
So `2.5(1-V_(B)) + (5)/(8)V_(B) = 1, 2.5 - 2.5 V_(B) + 0.625 V_(B) = 1`
`rArr 1.5 = 1.875 V_(B) rArr 0.8 = V_(B) , V_(A) = 0.2` , So `(V_(B))/(V_(A)) = 4`
Discussion
23384.

Which of the following is the correct method for synthesising methyl tert-butyl ether ad why? (i) (CH_(3))_(3)CB r+NaOM eto (ii) CH_(3)Br+NaO-tert-Buto

Answer»

Solution :(ii) Substitution always competes with elimination. Since `3^(@)` alkyl halides PREFERENTIALLY UNDERGO elimination while `1^(@)` alkyl halides preferentially UNDERGOES substitution, THEREFORE, reaction (i) will undergo elimination to give isobutylene while reaction (ii) will undergo substitution to give t-butyl methyl ether.
Discussion
23385.

What is the IUPAC name of monomer of Neoprene ?

Answer»

2-chloro buta-1,2-diene
3-chloro buta-1,3-diene
2-chloro buta-1,3-diene
3-chloro buta-1,2-diene

SOLUTION :2-chloro buta-1,3-diene
Discussion
23386.

The wave number of a wave of light is 2.0xx10^(14)cm^(-1). The frequency of this light is

Answer»

`6.6xx10^(3)s^(-1)`
`6.6xx10^(-3)e^(-1)`
`6.0xx10^(24)s^(-1)`
`6.0xx10^(-14)s^(-1)`

SOLUTION :`v=c/(lamda)=cxxbarv=3.0xx10^(10)xx2.0xx10^(-14)`
`=6.0xx10^(24)s^(-1)`
Discussion
23387.

Wurtz reaction is not suitable for preparation of following compound :-

Answer»

n-butane
n-hexane
n-pentane
Ethane

Answer :C
Discussion
23388.

What is meant by impurity defect? Explain with example.

Answer»

Solution :(i) A method of INTRODUCING defects in ionic solids by adding impurity ions.
(ii) If the impurity ions are in different valence state from that of host, vaccancies are created in the crystal lattice of thehost.
(III) For eg., addition of `CdCl_(2)` to silver chloride yields solid solutions where the divalent cation `Cd^(2+)` occupies the position of `Ag^(+)`
(iv) This will disturb the electrical neutrality of the crystal. In ORDER to MAINTAIN the same, PROPORTIONAL number of `Ag^(+)` ions leave the lattice. This produces a cation vaccancy in the lattice, such kindof crystal defects are called impurity defects.
Discussion
23389.

Which hormone regulates the sugarlevel in the blood ?

Answer»

SOLUTION :INSULLIN.
Discussion
23390.

Which of the following on treatment with hot concentrated acidified KMnO_4 gives 2 - methylhexane -1,6 - dioic acid the only organic product ?

Answer»




ANSWER :C
Discussion
23391.

When pyrolusite is fused with KOH in presence of air, the fused mass becomes:

Answer»

Pink
Green
Red
Black

Answer :A
Discussion
23392.

Which one of the following does not occur as sulphide ore?

Answer»

Zn
Cr
Ag
Fe

Answer :B
Discussion
23393.

Which enable to distinguish between formic acid and acetic acid :

Answer»

`Na_2CO_3`
AMMONIACAL `AgNO_3`
`FeCl_3`
LUCAS reagent

Answer :B
Discussion
23394.

The vapour pressure of water at 293 K is 2338 Pa and the vapour pressure of an aqueous solution is 2295.8 Pa. If solution density is 1010 kg//m^(3) at 313 K, calculate the omotic pressure at 313 K. (Molecular weight of solute = 60)

Answer»


ANSWER :`2.53 XX 10^(6) PA` ;
Discussion
23395.

Which of the following monosaccharide is pentose :

Answer»

Glucose
Fructose
Arabinose
Galactose

Answer :C
Discussion
23396.

Which of the following is not correctly named ?

Answer»

`NH_(2) - [CH_(2)]_(3) - NH_(2), 1, 3-`Diaminopropane or trimethylene diamine
`C_(6)H+_(5) - N (CH_(3))_(2)`, N-phenyl methylamine
`CH_(3) - NH - [CH_(2)]_(2) NH - CH_(3)` 2, 5-Diazohexane

SOLUTION :Correct name of `underset("N-Methyl-N-phenylmethylamine")(C_(6)H_(5)-N(CH_(3))_(2))`
Discussion
23397.

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

Answer»

SOLUTION :Antibiotics which kill or inhibit a WIDE range of gram-positive and gram-negative bacteria are SAID to be broad spectrum antibiotics.
Discussion
23398.

Which of the following cannot be used as plasticizers ?

Answer»

Di-n-octylphalate
Di-n-butylpthalate
TRICRESYL PHOSPHATES
SODIUM hexametaphosphate

ANSWER :D
Discussion
23399.

What is the atomic number of the next halogen if discovered ?

Answer»

85
117
167
104

Solution :The ATOMIC number `85` LIES in the sixth period and since the next halogen, If discovered, will LIE in the `7th` period. Hence, its atomic number MUST be `85+32=117`
Discussion
23400.

Which metal sulphide is not black?

Answer»

NiS
CoS
CuS
ZnS

Answer :D
Discussion