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19751.

To differentiate between pentan -2-one andpentan -3-one a test is carried out. Which of the following is the correct answer?

Answer»

Pentan - 2 -ONE will give silver mirror test.
Pentan - 2 - one will give IODOFORM test.
Pentan - 3 - one will give iodoform test.
None of these.

Answer :B
Discussion
19752.

What is the reagent used in the preparation of chloro-acetic acid from acetic acid

Answer»

<P>`PCl_5`
`Cl_2//"RED P"`
`PCl_3`
`SOCl_2`

ANSWER :B
Discussion
19753.

When benzene reacts with l-chloro-2,2-dimethylpropane (neopentyl chloride) in the presence of aluminum chloride, the major product is 2-methyl-2-phenylbutane, not 2,2-dimethyl-1-phenylpropane (neopentylbenzene). Explain this result.

Answer»

SOLUTION : The carbocation FORMED by DIRECT reaction of `AICI_3`with 1-chloro-2,2-dimethylpropane would be a primary carbocation, however, it rearranges to the more stable tertiary carbocation before it can react with the benzene RING.
Discussion
19754.

Write the main product of the following reactions: (i) CH_(3)-underset(O)underset(||)(C)-NH_(2) overset(Br_(2)+NaOH)to (ii) CH_(3)CN overset(LiAlH_(4))to

Answer»

Solution :(i). `underset("Ethananamide")(CH_(3)-underset(O)underset(||)(C)-NH_(2)) underset(("Hofmann bromamide REACTION"))overset(Br_(2)+NAOH)to underset("Methanomine")(CH_(3)-NH_(2))`
(II) `underset("Ethanenitrile")(CH_(3)CN) overset(LiAlH_(4))to underset("Ethanamine")(CH_(3)CH_(2)NH_(2))`
Discussion
19755.

Why a galvanic cell cell stops working after some true?

Answer»

Solution :With TIME, CONCENTRATIONS of the electrolytic solutions charge. Hence, their electrode potentials change when the electrode potentials of the two half-cells BECOME EQUAL, the cell stops working.
Discussion
19756.

Which of the following is an example of anionic complex ?

Answer»

`[Ag(NH_(3))_(2)]Cl`
`[CO(NH_(3))_(6)]Cl_(3)`
`[Fe(Co)_(5)]`
`K_(4)[Fe(CN)_(6)]`

Answer :C::D
Discussion
19757.

Total number of atoms in 44 g CO_(2) is

Answer»

`6*02xx10^(23)`
`6*02xx10^(24)`
`1*806xx10^(22)`
`18*06xx10^(22)`.

Solution :TOTAL no. of MOLES of `CO_(2)` in 44 g `= (44)/(44) = 1`
1 mole `CO_(2)` = 1 mole C + 2 mole O atoms
= 3 mole atom
`= 3xx6*02xx10^(23) = 1*806xx10^(24)`
Discussion
19758.

Which of the following has PDI value = 1.

Answer»

PVC
SBR
CELLULOSE
DACRON

SOLUTION :Cellulose
Discussion
19759.

Which of the following aqueous solution will have a pH less than 7.0

Answer»

`KNO_(3)`
NaOH
`FeCl_(3)`
NaCN

Solution :`Fe^(2+)` IONS are hydrolysed to DEVELOP ACIDIC nature.
Discussion
19760.

What is the pHof 0.01M H_(2)S solution ? Also determine [HS^(-)] & [S^(2-)] Given: For H_(2)S ,K_(a_(1))=9xx10^(-8),K_(a_(2))=1.2xx10^(-13)

Answer»

Solution :ASSUMING `K_(a_(1)) lt ltK_(a_(2))`
`{:(,H_(2)S,HARR,H^(+),+,HS^(-),),(t=0,C,,0,,0,),(t=eq,C(1-alpha),,,,Calpha,Calpha):}`
`alpha=sqrt((K_(a_(1)))/(C))=sqrt((9xx10^(-8))/(10^(-2)))=3xx10^(-3)rArr [H^(+)]=Calpha=10^(2-)xx3xx10^(-3)=3xx10^(-5)M`.
`pH=5-log3=4.52`.
Discussion
19761.

What are the units of conductance and specific conductance ?

Answer»

Solution :Conductance has units `OHM^(-1)` or S and SPECIFIC conductance has unit `ohm^(-1)cm^(-1)` or `ohm^(-1)m^(-1)` .
Discussion
19762.

What are the raw materials required to prepare Buna-S rubber?

Answer»

PHENOL + METHANAL
melamine + methanal
STYRENE + BUTADIENE
adipic ACID + methanal

Solution : styrene + butadiene
Discussion
19763.

Which of the following is the correcrt representation of Gay-Lussac's law?

Answer»




SOLUTION :MATHEMATICAL EXPRESSION of Gay-Lussac's LAW is
`ppropT or p=KT`
Discussion
19764.

[Y is used infire works, safety matches] 'Y' is

Answer»

`KClO_(3)`
`KBrO_(3)`
`NaIO_(3)`
`NaClO_(3)`

Solution :`UNDERSET("(X)")(3Cl_(2)) + 6KOH overset("HOT")(rarr) 5KCl+ underset("(Y)")(KClO_(3)) + 3H_(2)O, KClO_(3) overset("(Y)")(+ )con.HCl rarr`
Discussion
19765.

Which compound can exist in a dipolar (zwitter ion) structure ?

Answer»

`C_6H_5CH_2CH(N=CH_2) COOH`
` (CH_3)_2CHCH(NH_2) COOH`
` C_6H_5CONHCH_2COOH`
` HOOC CH_2CH_2COCOOH`

ANSWER :B
Discussion
19766.

Which of the following is an explosive component of dynamite ?

Answer»

Nitrobenzene
Trinitrobenzene
Glycol dinitrate
GLYCERYL trinitrate.

Solution :Glyceryl trinitrate is an EXPLOSIVE COMPONENT of DYNAMITE.
Discussion
19767.

Which element occurs freely in nature ?

Answer»

Iodine
Sulphur
Phosphorus
Magnesium

Answer :B
Discussion
19768.

Two liquids A and B boil at 145^(@)C and 190^(@)C respectively. Which of them has higher vapour pressure at 80^(@)C?

Answer»

SOLUTION :LIQUID A with lower boiling point is more VOLATILE and hence will have higher VAPOUR pressure.
Discussion
19769.

Wrtiea noteaboutglycogen ?

Answer»

SOLUTION :(i) Glycogen is thestoragepolysaccharideof animals . It ispresent in the liverand muscles of animals . Glycogen is calledas animal STARCH.
(II) Glycogen on HYDROLYSIS gives GLUCOGEN the branching occursevery 8-14 glucose unitsopposedto 24-30 unitsin amylopeticn. Theexcessiveglucose in the bodyis storedin thefromof glycogen .
Discussion
19770.

Which of the following acid is strongest

Answer»

`CH_(3) - COOH`
`Cl_(2)- CH_(2) - COOH`
`Cl_(2) CH - COOH`
`C Cl_(3) - COOH`

ANSWER :D
Discussion
19771.

Which among the following ion is not formed?

Answer»

`F_(3)^(-)`<BR>`Cl_(3)^(-)`
`Br_(3)^(-)`
`I_(3)^(-)`

ANSWER :A::C
Discussion
19772.

What are neutral oxides? Explain the nature of zinc oxide with the help of reaction. Define Molar Conductivity and Zero order reaction. In a first order reaction x to 40% of the given sample of compound rate constant of the reaction.

Answer»

Solution :The oxides which are neither acidic nor basic are called as neutral oxides. Ex. NO,CO,`N_(2)O` ETC.
Amphoteric natural of ZnO
`ZnO_((s)) + 2HCI_((aq)) to ZnCl_(2(s)) + H_(2) O_((1))`
`ZnO_((s)) + 2 NaOH_((aq)) to Na_(2) ZnO_(2(aq)) + H_(2) O_((1))`
Molar conductivity : The conductance of a volume of a solution containing 1 mole of dissolved electrolyte when PLACED between two parallel electrode 1 cm apart.
Zero order reaction : The reaction whose rate is independent of the reaction concentration adn remains CONSTANT throughout the course of the reaction.
Solution : ATT = 45 concentration `[A]_(0) = 100` final concentration `[A]_(R ) = 40`
`K = (2.303)/(t) log_(10) ([A]_(0))/([A]_(t))`
`= (2.303)/(45) log_(10) (100)/(40)`
`= (2.303)/(45) log_(10) 2.5`
`= (2.303 xx 0.3979)/(45)`
`= 0.02036 "min"^(-1)`
Discussion
19773.

The van der Waals equation reduces itself to the ideal gas equatio nat

Answer»

HIGH PRESSURE and LOW TEMPERATURE
low pressure and low temperature
low pressure and high temperature
high pressure and high temperature

Answer :C
Discussion
19774.

Which of the following is colourless?

Answer»

CuCl
`K_(3)[Cu(CN)_(4)]`
`CuF_(2)`
`[Cu(CH_(3)(N)_(4))] BF_(4)`

ANSWER :A::B
Discussion
19775.

Which is an application ofHenry's law?

Answer»

Spray paint
Bottled WATER
Filling up a tire
Soft drinks (soda)

SOLUTION :To increase the solubulity of `CO_(2)` in soft drinks and soda water, the bottlle is sealed under HIGHT PRESSURE.
Discussion
19776.

Transition elements occupy the central position of the periodic table between………….. elements.

Answer»

<P>

SOLUTION : s and p BLOCK
Discussion
19777.

Which of the following would decarboxylates readily when heated ?

Answer»

`HN=CH-CH_(2)-SO_(2)H`


ANSWER :B::C::D
Discussion
19778.

What is the electrode potential (in V) of the following electrode at25^(@)C? Ni^(2+)(0.1)|Ni_((s)) (standard reduction potential of Ni^(2+)|Niis -0.25V, 2.303RT//F=0.06 )

Answer»

-0.25
-0.28
`+0.25`
-0.31

Answer :B
Discussion
19779.

Which one of the following when reacts with CH_3MgBr followed by hydrolysis gives acetic acid?

Answer»

CO
`CH_(3) CHO`
`C_(2) H_(5) OH`
`CO_(2)`

ANSWER :D
Discussion
19780.

Two moles of pure liquid 'A' (P_(A)^(0)=80 mmof Hg) and 3 mole of pure liquid 'B' (P_(B)^(0)=120mm of Hg) are mixed . Assuming ideal behaviour

Answer»

Vapour PRESSURE of the mixture is 104 MM of Hg
Mole fraction of LIQUID 'A' in Vapour pressure is `0.3077`
Mole fraction of 'B' in vapour pressure is 0.692
Mole fraction of 'B' in vapour pressure is 0.785

Answer :A::C
Discussion
19781.

Which of the followingrespond to borax test ?

Answer»

NICKEL SALTS
Copper salts
Cobalt salt
Aliuminium salt

ANSWER :a,b,c
Discussion
19782.

Which of the following is the least basic amine ?

Answer»

ETHYL amine
Diethyl amine
Aniline
Benzyl amine

Solution :Basicity of amines is DUE to the availability of electron density on N atom for protonation. Presence of ALKYL group In alkyl amines increases the electron density on N-atom by virtue of +I effect. However, aniline is less basic as phenyl group exerts -I effect, i.e., it WITHDRAWS electron resulting i lower avaliability of electron on nitrogen for protonation.
Discussion
19783.

When the value of entropy is greater, then the ability of work

Answer»

Is MAXIMUM
Is minimum
Is medium
None of these

Solution :When the VALUE of ENTROPY is greater, then ability of work is maximum.
Discussion
19784.

The reagent used to bring about the transfermation of but-2-ene to acetaldehyde

Answer»

Pyridinumchlorochromate
`O_(3), H_(2)O` and ZN dust
Chromium trioxide
Acidified dichromate

Answer :B
Discussion
19785.

The rms speed of N_(2) molecules in a gas in u. If the temperature is doubled and the nitrogen molecules dissociate into nitrogen atom, therms speed becomes

Answer»

2u
4u
14u
`SQRT(2)U`

ANSWER :A
Discussion
19786.

Which of the following statements is not true regarding alkali metals?

Answer»

The alkali metals exhibit only +1 oxidation state.
The alkali metals have HIGH CHEMICAL reactivity
Since the alkali metals have good tendency to LOSE s-electron, they behave as STRONG oxidising agents.
The alkali metals dissolve in liquid ammonia to give blue coloured solutions.

Solution :Behave as strong REDUCING agents.
Discussion
19787.

Write the biologically importance of coordination compounds.

Answer»

Solution :Biological important of coordination compounds:
(i) A red blood corpuscles (RBC) is composed of heme group, which is `Fe^(2+)`- Porphyrin complex. It plays an important role in carrying oxygen from LUNGS to tissues and carbon dioxide from tissues to lungs.
(ii) Chlorophyll, a GREEN pigment present in green plants and algae, is a coordination complex containing `Mg^(2+)` as central metal ion surrounded by a modified Porphyrin ligand called corrin ring. It plays an important role in photosynthesis, by which plants converts `CO_(2)` and water into carbohydrates and oxygen.
(iii) Vitamin `B_(12)` (CYANOCOBALAMINE) is the only vitamin consist of metal ion. It is a coordination complex in which the central metal ion is `Co^(+)` surrounded by Porphyrin like ligand.
(iv) Many enzymes are known to be metal complexes, they regulate biological processes. For example, Carboxypeptidase is a protease enzyme that HYDROLYTIC enzyme important in digestion, contains a zinc ion coordinated to the protein.
Discussion
19788.

Vapour pressure of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot p_("total"),p_("chloroform") and p_("acetone") as a function of x_("acetone"). The experimental data observed for different composition of mixture is: {:(100xx x_("acetone"),0,11.8,23.4,36.0,50.8,58.2,64.5,72.1),(p_("acetone")//"mm Hg",0,54.9,110.11,202.4,322.7,405..9,454.1,521.1),(p_("chloroform")//"mm Hg",632.8,548.1,469.4,359.7,257.7,193.6,161.2,120.7):} Plot this data also on the same graph paper. Indicate whether it has positive devition or negative deviation from the ideal solution.

Answer»

SOLUTION :`{:(x_("acetone"),0.0,11.8,23.4,36.0,50.8,58.2,64.5,72.1),(p_("acetone")//"mm Hg",0,54.9,110.1,202.4,322.7,405.9,454.1,521.1),(p_("chloroform")//"mm Hg",632.8,548.1,469.4,359.7,257.7,193.6,161.6,120.7):}`

As the plot for `p_("total")` dips downwards, hence the solution shows negative DEVIATION from the IDEAL BEHAVIOUR.
Discussion
19789.

Wavelength of red light is absorbed by the complex

Answer»

`[Cu(CN)_(4)]^(2-)`
`[Cu(NH_(3))_(4)]^(2=0`
`CuSO_(4)`
`Cu(CN)_(2)`

Solution :When `NH_(4)OH` is added to the solution containing `Cu^(2+)` ions, DEEP blue solution is obtained.
`Cu^(2+)+4NH_(4)OH to underset("deep blue solutio")([Cu(NH_(3))_(4)]^(2+))+4H_(2)O`
HYDRATED cupric compounds absorb RADIATIONS corresponding to red light and the transmitted colour is greenish blue (which is complementary to red colour). THUS, cupric compounds give greenish-blue colour.
Discussion
19790.

What happens when ammonia reacts with acetic acid?

Answer»

Solution :`UNDERSET("ACETIC acid")(CH_3COOH) + NH_3 to underset("AMMONIUM acetate ")(CH_3COO^(-) NH_4) OVERSET(DELTA)(to) underset("acetamide")(CH_3CONH_2) + H_2O`
Discussion
19791.

Which of the following solutions will turn violet when a drop of lime juice is added to it?

Answer»

A solution of Nal
A solution mixture of KI and `NaIO_3`
A solution mixture of Nal and KI
A solution mixture of `KIO_3` and `NalO_3` .

Solution :`5I^(-) + IO_(3)^(-) + underset("(from LIME juice)") (6H^(+)) to underset("VIOLET")(3I_(2)) + 3 H_(2)O`
Discussion
19792.

Write the structural formula of the following compound. (i) Phenyl methanol (ii) 2-methyl-but-3-en-2-o1

Answer»

SOLUTION :(i) PHENYL methanol: `C_6H_5 - CH_2OH`
(ii) 2-methyl-but-3-en-2-ol: `CH_2 = CH -UNDERSET(CH_3) underset(|)overset(CH_3)overset(|)C-OH`
Discussion
19793.

What is the end product in the following sequence of operations ? C_(2)H_(5)NH_(2)overset(HNO_(2))rarrAoverset(PCI_(5))(rarr)Boverset(NH_(3))(rarr)C

Answer»

Ethyl cyanide
Mcthylaminc
ETHYLAMINE
Acetamide

Solution :`underset("Ethylamine")(C_(2)H_(5)NH_(2))OVERSET(HNO_(2))(rarr)underset((A))(C_(2))H_(5)OH underset((B))overset(PCI_(5))(rarr)C_(2)H_(5)CI overset(NH_(3))(rarr)underset("Ethylamine"(C))(C_(2)H_(5)-NH_(2))`
Discussion
19794.

Which of the following is not a semisynthetic polymer ?

Answer»

cis-polyisoprene
Cellulose nitrate
Cellulose ACETATE
Vulcanised rubber

Answer :A
Discussion
19795.

Which of the following are not soluble in excess of NaOH?

Answer»

`AL(OH)_(3)`
 `CR(OH)_(3)`
`Zn(OH)_(2)`
`Fe(OH)_(3)`

Answer :B::D
Discussion
19796.

Write the formulae of the following : (i) bis (acetylacetonato) oxovanadium (IV) (ii) dichloridoplatinum (IV) tetrachloridoplatinate (II)

Answer»

Solution :(i) `[V (acac)_(2)O] (ii) [PtCl_(2)][PtCl_(4)]`
Discussion
19797.

Which one of the following is an incorrect statement for physisorption?

Answer»

It is a reversible process
It requires LESS heat of adsorption
It requires activation energy
It TAKE place at low TEMPERATURE

Solution :It requires activation energy
Discussion
19798.

Which one of the following statements is noy correct ?

Answer»

PLANT LATEX is colloidal solution of RUBBER particles which are negatively charged
Haemoglobin is a positively charged sol
On prolonged DIALYSIS the colloid is stabilized
The process of settling down of colloidal particle of coagulation

Answer :C
Discussion
19799.

Which is most basic in character

Answer»

RbOH
KOH
NaOH
LiOH

Solution :`OVERSET("LiOH lt NaOH lt KOH lt RbOH")underset("Down the GROUP basic character INCREASES")to`
Discussion
19800.

What are X and Y in the following reaction sequence C_(2)H_(5)OH overset(Cl_(2))rarr X overset(Cl_(2))rarr Y.

Answer»

`C_(2)H_(5)Cl, CH_(3)CHO`
`CH_(3)CHO, CH_(3)CO_(2)H`
`CH_(3)CHO, C Cl_(3)CHO`
`C_(2)H_(5)Cl, C Cl_(3)CHO`

SOLUTION :Vinyl chloride `CH_(2)=CHCl` can be represented as a resonance hybrid of the following structures.

As such C-Cl bond ACQUIRES some double bond character, i.e., Cl is attached to C by little more than a single pair of electrons consequently C-Cl bond in vinyl HALIDES is little stronger than in alkyl halides and hence cannot be easily broken.
Discussion