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4901.

The suitable reagent for the following reactions is

Answer»

`LiAlH_(4)`
`Na//C_2H_(5)OH`
`H_(2)//NI`
`CH_(2)=O //BAR(O)H`

Answer :D
Discussion
4902.

What are the IUPAC names of the insecticide DDT and benzene hexachloride? Why is their use banned in india and toehr countries?

Answer»

Solution :The IUPAC NAME of DDT is 2,2-bis (4-chlorophenyl)-1,1,loroethane and that of BENZENE hexachloride is 1,2,3,4,5,6-hexachlorocyclohexane. Their use in in INDIA and other contries has been banned because they are not biodegradalb.e as a result, these insecticides enter the food chain of ANIMALS and get deposited in their FATTY tissues over a period of time and affect their reproductive systems.
Discussion
4903.

The solution of strong acid and weak base NH_(4)Cl is

Answer»

Acidic
Basic
Neutral
None of the above

Answer :A
Discussion
4904.

Which of the following is oxidised by SO_2 ?

Answer»

MG
`K_2Cr_2O_7`
`KMnO_4`
All

Answer :A
Discussion
4905.

Using IUPAC norms write the formulae for the following : Pentaamminenitrito-O-cobalt (III) chloride

Answer»

SOLUTION :`[Co(NH_(3))_(5)ONO]Cl_(2)`
Discussion
4906.

What is the sign of DeltaH and DeltaS for adsorption process.

Answer»

SOLUTION :`DELTAH=- ve , DeltaS=-ve`
Discussion
4907.

Which of the following transformation are feasible?

Answer»

`CH_(3)CH_(2)CH_(2)CH_(3) OVERSET(AlCl_(3),Delta)toH_(3)C-UNDERSET(H)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-CH=CH_(2)underset(200-300^(@)C)overset(AlCl_(3))toCH_(3)-CH_(2)-CH=CH-CH_(3)`
`CH_(3)CH_(2)CH=CH_(2)overset(AlCl_(3))to H_(2)O=underset(CH_(3))underset(|)(C)-CH_(3)`

Answer :A::B::C
Discussion
4908.

Which of the following cannot show electromeric effect ?

Answer»

Alkenes
Ketones
Aldehyde
Ethers

Answer :D
Discussion
4909.

Which of the following is true for the given reaction? overset( :overset(..)O:^-)overset(|)((S)-C_2H_5CHCH_3+CH_3I)rarroverset(OCH_3)overset(|)C_2H_5CHCH_3+I^(-)

Answer»

The configuration is unchanged and the product is `S`
The configuration is chnaged and the product is `R`
The configuration is chnaged and product is `S`
The configuration is unchanged and the product is `R`

Solution :Because the bonds to the chiral carbon ATOM are not distrubed, the configuration is unchanged. SINCE the priority order is unchanged, the product is `(S)`. Note that product (like REACTANT) is optically ACTIVE.
The products and reactants will have different specific rotations and their signs may DIFFER. specific rotations of reactants and products are independent of each other.
Discussion
4910.

What is the equilibrium constant, K for the following reaction at 400 K? 2NOCl (g) hArr 2NO(g)+Cl_(2)(g) DeltaH=77.2" kJ "mol^(-1) and DeltaS=122JK^(-1)mol^(-1) at 400K.

Answer»

`-3.708`
`1.95xx10^(-4)`
`2.8xx10^(4)`
`1.67xx10^(-5)`

Solution :`DeltaG=DeltaH-TDeltaS`
`=77.2-400xx122xx10^(-3)`
`=+28.4kJ" "MOL^(-1)=28400" J "mol^(-1)`
Further, `DeltaG=-2.303RTlogK`
or `28400=-2.303xx8.314xx400xxlogK`
`logK=-(28400)/(2.303xx8.314xx400)`
`logK=-3.708`
`K=`Antilog (-3.708)`=1.95xx10^(-4)`
Discussion
4911.

What is the pH value of N/1000 KOH solution.

Answer»

`10^-11`
3
2
11

Solution :`10^-3N` KOH will GIVE `[OH^-]=10^-3 M`
pOH=3
`pH+pOH=14`
`pH=14-3=11`
Discussion
4912.

Which of the following is used as a local anaesthetic ?

Answer»

Caffeine
atropine
Novocaine
Nicotine.

Solution :Novocaine is used as a local anaesthetic. It CONTAINS a `1^(@)` and a `3^(@)` amino GROUP. It is ALSO called PROCAINE
Discussion
4913.

XeF_6 + x H_2O to XeO_3+ y HF, the y/x =________

Answer»


SOLUTION :`XeF_6 + 3H_2O to XeO_3 + 6HF , y/x = 3`
Discussion
4914.

Which of the following are methods of concentration of minerals

Answer»

girvity separation
Froth floation process
electromagnetic separation
smelting

Answer :A::B::C
Discussion
4915.

What kind of soaps are obtained by dissolving the soap in ethanol and then evaporating the excess solvent ?

Answer»

SOLUTION :TRANSPARENT SOAP
Discussion
4916.

The strongest base in the following is:

Answer»

`AL(OH)_2`
`MG(OH)_2`
`Ca(OH)_2`
`BA(OH)_2`

Answer :D
Discussion
4917.

Which one is found in ATP ribonucleotide

Answer»

Guanine
Uracil
Adenine
None of these

ANSWER :C
Discussion
4918.

Which oxy acids are stable only in aq. state not in solid state ?

Answer»

`HClO_(3), HClO_(4)`
`HBrO_(4), HIO_(4)`
`HBrO_(3), HIO_(3)`
`HBrO_(2), HIO_(2)`

ANSWER :D
Discussion
4919.

Transition metals are less reactive because of their

Answer»

HIGH I.P. and low MELTING point
 high I.P. and high melting point
low :P. and low melting point
 low I.P. and high melting point

Answer :B
Discussion
4920.

Which of the following is monosaccharide

Answer»

Galactose
Sucrose
GLYCOGEN
Cellulose

Solution :Galactose is monosaccharide because it cannot be hydrolysed
(b) Sucrose is disaccharide which on HYDROLYSIS gives 2 moles of monosaccharide i.e, glucose and fructose
(C) Glycogen is polymer of glucose, THEREFORE, it is polysaccharide.
(d) Cellulose is linear polymer of `beta`-glucose, therefore, it is polysaccharide.
Discussion
4921.

When ethyl Iodide is heated with dry silver oxide the product formed is

Answer»

`CH_3-CH_2 - OH`

`CH_3CHO`
`CH_3 - CH_2 -O - CH_2 - CH_3`

SOLUTION :`C_2H_5I + Ag_2O + I -C_2H_5 to 2AgI + C_2H_5 - O-C_2H_5`
Discussion
4922.

Which does not mutarotation

Answer»

SUCROSE
Maltose
Glucose
Fructose

Solution :Sucrose does not SHOW MUTAROTATION due to NON reducing NATURE.
Discussion
4923.

Which of correct against property mentioned ?

Answer»

`CH_(3)COCL GT (CH_(3)CO)_(2)O gt CH_(3)COOEt gt CH_(3)CONH_(2)` (Rate of hydrolysis)


`CH_(3)-OVERSET(O)overset(||)(C)-COOH gt CH_(3)-overset(O)overset(||)(C)-CH_(2)-COOH gt Ph-CH_(2)-COOH` (Rate of DECARBOXYLATION)

Answer :A::B
Discussion
4924.

What are different oxidation states exhibited by lanthanoids ?

Answer»

SOLUTION :The most common oxidation state of LANTHANOIDS is `+3` . However, some lanthanoids also hsow an oxidatin state of `+2` and `+4` . For example , Eu shows an oxidation state of `+2` and Ce shows an oxidation state of `+4`.
Discussion
4925.

Which of the following oxyacides of chlorine possesses least oxidising nature

Answer»

HOCL
`HClO_2`
`HClO_3`
`HClO_4`

ANSWER :D
Discussion
4926.

Which is the strongestacid ?

Answer»

`Cl-CH_2-CH_2-OH`
Discussion
4927.

There are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. hybridization easily explains the ease of sigma donation capability of NH_(3) and PH_(3). phosphine is a flammable gas and is prepared from white phosphorous. White phosphorus on reaction with NaOH gives PH_(3) as one of the products. This is a

Answer»

DIMERIZATION reaction
Disproportional reaction
Condensation reaction
Precipitation reaction

SOLUTION :`P_(4) + 3NaOH + 3H_(2)O to PH_(3) + 3NaH_(2)PO_(2)`
disproportional reaction.
Discussion
4928.

Which of the following compounds cannot be prepared by direct reaction between the constituent elements

Answer»

`XeF_2`
`XeF_4`
`XeOF_4`
`XeO_3`

SOLUTION :`XeF_6 + H_2O to XeOF_4 + 2HF , XeF_6 +3H_2O to XeO_3 + 6HF`
Discussion
4929.

What is the action of HCN on (i) propanone (ii) 2,4-dichlorobenzaldehyde.

Answer»

SOLUTION :
Discussion
4930.

Explain the effect of electron withdrawing groups. [EWG]on the acidity of carboxylic acids. Give examples.

Answer»

Solution : ELECTRON with drawing group increases ACIDIC STRENGTH.
Electron DONATING group DECREASES acidic strength.
Discussion
4931.

Write short note on metal excess and metal deficiency defect with an example.

Answer»

Solution :Metal excess defect
Metal excess defect arises due to the presence of more number of metal ions as compared to ANIONS. Alkali metal halides NaCl, KCI show this type of defect. The electrical neutrality of the crystal can be maintained by the presence of anionic vacancies equal to the excess metal ions (or) by the presence of extra cation and electron present in interstitial position.
For example, when NaCl crystals are heated in the presence of sodium vapour, `Na^(+)` ions are formed and are deposited on the surface of the crystal. Chloride ions `(CI^(-))` diffuse to the surface from the lattice point and combines with `Na^(+)` ion. The electron lost by the sodium vapour diffuse into the crystal lattice and occupies the vacancy created by the `CL^(-)`ions. Such anionic vacancies which are occupied by unpaired electrons are called F centers. Hence, the formula of NaCl which contains excess `Na^(+)` ions can be written as `Na_(1+x) Cl`.
Metal deficiency defect :

Metal deficieney defect arises due to the presence of less number of cations than the anions. This defect is observed in a crystal in which, the cations have variable oxidation states.
For example, in FeO crystal, some of the `FE^(2+)` ions are missing from the crystal lattice. To maintain the electrical neutrality, twice the number of other `Fe^(2+)` ions in the crystal is oxidized to `Fe^(3+)` ions, In such cases, overall number of `Fe^(2+)` and `Fe^(3+)` ions is less than the `O^(2-)` ions. It was experimentally found that the general formula of ferrous oxide is `Fe _(x)O`, where x ranges from 0.93 to 0.98.
Discussion
4932.

What purine and pyrimidine bases are present in DNA and RNA ?

Answer»

SOLUTION :PURINES : adenine and GUANINE : pyrimidines : CYTOSINE and thymine in DNAand cytosine and uracil and RNA
Discussion
4933.

Write the total number of cyclic isomers possible for a hydrocarbon with the molecular formula, C_(4)H_(6).

Answer»


ANSWER :5
Discussion
4934.

What is effective atomic number?

Answer»

Solution :Total number of electrons present AROUND the central metal ion or atom INCLUDING those DONATED by the ligands.
OR
EAN = Z-X + Y
Discussion
4935.

Which of the following is true for allotropes of phosphorous?

Answer»

Yellow phsphorus is soluble in `CS_2` while red phosphorus is not
P - P - P bond angle is `60^@` in red phohorus
On heating in air, white phosphorus change to red
white phosphorus will slowly change to red phosphorus at ordinary temperatures.

Solution :(a)White phosphorous INSOLUBLE in water and soluble in `CS_2`
(b) White phosphorous `OVERSET(573K)underset("Several DAYS")rarr`Red phosphorous
Discussion
4936.

Which of the following pair of anions are identified by conc. H_(2)SO_(4).

Answer»

`NO_(3)^(-), CO_(3)^(2-)`<BR>`CL^(-), NO_(3)^(-)`
`Br^(-), CO_(3)^(2-)`
`CO_(3)^(2-), CH_(3)CO O^(-)`

Answer :B
Discussion
4937.

Which one of the following is used as an antacid?

Answer»

MAGNESIUM hydroxide
aluminium hydroxide
ranitidine
all the above

Solution : all the above
Discussion
4938.

Which is not a n-bonded complex:

Answer»

Zeise salt
Ferrocene
Dibenzene CHROMUM
Tbtraethyl lead

Answer :D
Discussion
4939.

The standard reduction potential of Ag^(+)|Ag electrode is 0.80 volt. Calculate the standard electrode potential of Cl^(-)|AgCl|Ag at 25^(@)C. Given solubility product, K_(sp)(AgCl)=1.8xx10^(-10).

Answer»

Solution :APPLY
`E_(cell)^(@)=0.0591xxlog [Ag^(+)][Cl^(-)]=0.591 log K_(sp) (AGCL)`
`E_(cell)^(@)=-0.576` volt
`E_(cell)^(@)`= OXID. pot. anode + RED. pot. CATHODE
Red. Pot. Cathode `[Cl^(-)|AgCl|Ag]=-0.576-(-0.80)`
`=-0.576+0.80=0.224` volt
Discussion
4940.

Which of the following is nonaromatic ?

Answer»




SOLUTION :It does not CONTAIN `PI`-ELECTRON SYSTEM.
Discussion
4941.

What will be the wavelength of oxygen molecule in picometers moving with a velocity of 660 ms^(-1) (h = 6.626 xx 10^(-34) kg m^2 s^(-1)).

Answer»

SOLUTION :18.8 PM
Discussion
4942.

Which of the following compounds onboiling with KMnO_(4)(alk.) and subsequent acidification will not give benzoic acid

Answer»

Benzyl alcohol
Acetophenone
Anisole
Toluence

Solution :
on `KMnO_(4)` OXIDATION does not GIVE BENZOIC acid .
Discussion
4943.

What happens when aldehyde reacts with Tollens' reagent ?

Answer»

SOLUTION :A SILVER MIRROR is OBTAINED
Discussion
4944.

Which of the following are known as mercaptans :

Answer»

Thio-alcohols
Thio-ethers
Thio-aldehydes
Thio-acids

Answer :A
Discussion
4945.

Which of the following is primary amine :

Answer»

Acetanilide
Dimethylamine
2 - aminopropane
N,N - DIMETHYL - 1,2 - aminopropane

ANSWER :C
Discussion
4946.

The speed of colloidal particles in a colloidal sol at different pH values during electrophoresis are given below : {:(pH, 4.20,4.56,5.20,5.65,6.30,7.0),("Speed",+0.50+,0.18,-0.25,-0.65,-0.90,-1.25):} (mums^(-1)) (opposite signs indicate opposite direction of travel) The isoelectric point of the colloidal sol will be

Answer»

`4.2`
`4.8`
`7.0`
`5.20`

Solution :Isoelectirc point of a COLLOIDAL sol is the pH at which colloidal particles carry no charge. Above this pH, colloidal particles varry positive or NEGATIVE charge and below this pH, the aharge is reversed. THUS, REVERSAL takes PLACE between `4.56 and 5.20.`
Discussion
4947.

Which of the following has highest magnetic moment?

Answer»

`Cr^(3+)`
`FE^(3+)`
`CO^(3+)`
`V^(3+)`

ANSWER :B
Discussion
4948.

Which one of the following cannot be used as monomer in a polymerization reaction

Answer»

`C_(2)H_(4)`
`C_(2)H_(2)`
`C_(2)H_(6)`
`C_(4)H_(6)`

ANSWER :C
Discussion
4949.

Which of the following is change with temperature ?

Answer»

Molality
% W/W
FORMALITY
Mole fraction

Solution :Formality is VOLUME dependent ND volume is change with change in TEMP.
Discussion
4950.

What is physical Adsorption?

Answer»

Solution :Accumulation of gas on the surface of a SOLID DUE to WEAK VANDER Waal.s force.
Discussion