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3701.

Which of the following statements about anhydrous aluminium chloride is correct?

Answer»

It EXISTS as `AlCl_(3)` molecules in vapour.
It is not easily hydrolysed.
It sublimes at `100^(@)C` under vaccum.
It is a strong LEWIS base.

Answer :C
Discussion
3702.

Which of the following polymers is generally used in making carry bags ?

Answer»

POLYESTER
BAKELITE
POLYTHENE
ALKYL resins

Answer :C
Discussion
3703.

When acetyl chloride reacts with any amine, the reaction is known as:

Answer»

SAPONIFICATION
ESTERIFICATION
acetylation
condensation

Answer :C
Discussion
3704.

Which of the following haloakane is hydrolysed b SN^(1)mechansims ?

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`CH_(3)BR`
`CH_(3)CH_(2)CH_(2)Br`
`C_(2)H_(5)Br`
`(CH_(3))_(3)CBR`

Solution : THUS, `SN^(1)` reactivity of haloakanes occurs in the order `CH_(3)lt 1^(@) lt 2^(@) lt 3^(2)`. The determining factor is stability of carbocation.
Discussion
3705.

What is a primary electrochemical cell?

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SOLUTION :A CELL that cannot be RECHARGED again and again is CALLED PRIMARY cell.
Discussion
3706.

Which of the following statement about H_(3)BO_(3) is not correct

Answer»

It is strong TRIBASIC acid
It is PREPARED by acidifying an aqueous solution of borax
It has a LAYER structure in which planar `BO_(3)^(3-)` units are joined by hydrogen bonds
It does not act as proton DONOR but acts as a lewis acid by accepting hydroxyl ion

Answer :A
Discussion
3707.

What is the free energy change DeltaG when 1.0mole of water at 100^(@)C and 1 atm pressure is converted into steam at 100^(@)C and 1 atm pressure

Answer»

540 CAL
`-9800` cal
9800 cal
0 cal

Solution :At EQUILIBRIUM `DeltaG=0`.
Discussion
3708.

Which is the most stable conformation of 3,4-dimethylihexane?

Answer»




ANSWER :D
Discussion
3709.

Zn(OH)_(2) undersetto(Delta)[X] Select the correctstatement (s) for the compound X.

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`X` on HEATING with cobalt nitrate gives green mass
`X` on heating alone, becomess yellow but turns white on cooling
Solution of `X` in dilute `HCl` gives bluish white// white precipitate with excees potassium ferrocyanide.
None Of These

Solution :`X` is `ZnO` which on heating with cobalt nitrate gives `ZnO. CoO`, the Rinmann's green
(B) It TURN yellow on heating and becomes white on cooling.
(C )` ZnCl_(2)` form bluish white//white precipitate. `Zn_(3)K_(2)[Fe(CN)_(6)]_(2)`
`3Zn^(2)+2K^(+)+2[Fe(Fe(CN)_(6)]^(4-)toK_(2)Zn_(3)[Fe(CM)_(6)]_(2)downarrow`
(D) `ZnO+2NaOHtoNa_(2)ZnO_(2)("Soluble complex")+H_(2)O`.
So, option`A,B& C` are correct.
Discussion
3710.

What is the productof the following reaction ?

Answer»




ANSWER :D
Discussion
3711.

What is the correct relation ship between the pH values of isomolar solution of Na_(2)(O(pH_(1)), Na_(2)S(pH_(2)), Na_(2)Se(pH_(3)) and Na_(2)Te(pH_(4)) ?

Answer»

`pH_(1) lt pH_(2) lt pH_(3)lt pH_(4)`
`pH_(1) gt pH_(2) gt pH_(3) gt pH_(4)`
`pH_(1) lt pH_(2) lt pH_(3)=pH_(4)`
`pH_(1) gt pH_(2)=pH_(3) gt pH_(4)`

Solution :`Na_(2)O=` BASIC. Basic nature gradually DECREASES.
Discussion
3712.

What is the major product of the following reaction ?

Answer»




ANSWER :B
Discussion
3713.

Which of the following on reaction with Br_(2) water will give2,4,6-tribromo phenol

Answer»

Phenol
4-hydroxy BENZENE sulphonic acid
Salicylic acid
None of these

Solution :
Discussion
3714.

Which of the following metal does not obtained by electrolysis of its aqueous salt solution ?

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Ag
Ca
Cu
Cr

Solution :Because, Ca is active metal, it gives REACTION with water. So we can.t do REDUCTION of `Ca_((AQ))^(2+)`.
Discussion
3715.

The two electrons have the following set of quantum numbers: P=3,2,-2,+1/2 Q=3,0,0,=1/2 Which of the following statement is true?

Answer»

<P>P has lesser energy than Q
P and Q have same energy
P and Q REPRESENT same electron
P has greater energy than Q.

Solution :P electron corresponds to 3D electron Q elecron corresponds to 3S electron.
`:.` P has greater energy than Q.
Discussion
3716.

Which one of the following reaction will not result in the formation of carbonation bond ?

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Reimer-Tiemann reaction
Friedal CRAFT's ACYLATION
WURTZ reaction
Cannizaro reaction

Answer :D
Discussion
3717.

Which of the following anions is most easily polarised ?

Answer»

`Cl ^(-)`<BR>`Se ^(2-)`
`Br ^(-)`
`TE ^(2-)`

Answer :D
Discussion
3718.

Total number of possible structural isomers of C_(5)H_(11)Br.

Answer»

<BR>

SOLUTION :`[C_(5)H_(11)Br]` , Total =8
(a) `C-C-UNDERSET(Br)C-C-C-Br`
(b) `C-C-C-overset(Br)overset(|)C-C`
(c ) C-C-C-C-C
(d) `C-C-underset(C)underset(|)C-C-Br`
(E) `C-C-overset(Br)overset(|)underset(C)underset(|)C-C`
(f) `Br-C-C-underset(C)underset(|)C-C`
(h) `C-overset(C)overset(|)underset(C)underset(|)C-C-Br`
(i) `C-overset(Br)overset(|)C-C-underset(C)underset(|)C-C`
Discussion
3719.

To detect the reducing and non reducing sugars, which of the following test is used

Answer»

MOLISCH TEST
BIURET test
Fehling's test
MILLION's test

ANSWER :C
Discussion
3720.

Write IUPAC names of the following

Answer»

SOLUTION :i) 3-Bromo- 2 - methylpropene
II) 4-Bromo- 3-methylpent - 2 - ene
iii) 1 - Bromobut - 2 - ene
IV) 1-Bromo-2-methylbut-2-ene .
Discussion
3721.

The two ions A^+' and 'B^- have radii 85 and 200 pm respectively. In the closed packed crystal of compound AB, the coordination number of A^+ ion is

Answer»

3
4
6
8

Answer :C
Discussion
3722.

Which of the following statements is not true about low density polythene?

Answer»

Tough
Hard
Poor CONDUCTOR of electricity
Highly BRANCHED STRUTURE

ANSWER :C
Discussion
3723.

What happens when NH_3is treated with chlorine in small quantity?

Answer»

SOLUTION :`N_2` GAS is PRODUCED.
`8NH_3 + 3Cl_2 →N_2 + 6 NH_4 CL`
Discussion
3724.

Which is used in discomfort ?

Answer»

EQUANIL
Hexachlorophene
RESORCINOL
PICRIC ACID

ANSWER :A
Discussion
3725.

The vapour pressure of water is 12.3 kPa at 300 K. Calculate the vapour pressure of 1 molal solution in it.

Answer»

<P>

Solution :1 molal solution means 1 mol of the SOLUTE in 1 KG of the solvent (water).
`therefore"Mol fraction fraction of solute "=(1)/(1+55.5)=0.0177`
`"Now,"(p^(@)-p_(s))/(p^(@))=x_(2), i.e.,(12.3-p_(s))/(12.3)=0.0177"or"p_(s)="12.08 kPa."`
Discussion
3726.

To prevent oxidation of chloroform …….. is added.

Answer»

Orthophosphoric ACID
ETHANOL
UREA
ACETONE

SOLUTION :
Discussion
3727.

What is the action of ethanol on acetaldehyde ? What is the action of ethylene glycol on acetone?

Answer»

Solution :Aldehyde reacts with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to form an intermediate KNOWN as hemiacetal, which further adds another MOLECULE of alcohol to form a gem-dialkoxy compound known as acetal. Ketone reacts with ethylene GLYCOL under similar CONDITIONS to form cyclic PRODUCTS known as ethylene glycol ketals.
Discussion
3728.

Which is the simplest electrolytic cell ? Give detailed note on it.

Answer»

Solution :* One of the simplest electrolytic cells consists of two copper strips dipping in an AQUEOUS solution of copper sulphate.
* Construction : It consists of two strips dipping in an aqueous solution of copper sulphate. One is anode and another is cathode.
* Working : If DC voltage is applied to the two electrodes, then `Cu^(2+)` ions discharge at the cathode (negatively charged) and the following reaction TAKES place:
`Cu_((aq))^(2+)+2e^(-) to Cu_((S))`
* Copper METAL is deposited on the cathode.
At the anode, copper is converted into `Cu^(2+)` ions by the reaction:
`Cu_((S)) to Cu_((aq))^(2+)+2e^(-)`
* Thus, copper is dissolved (oxidised) at anode and oxidation is carried out.
So total reaction: `underset("Impure")(Cu_((S)))("anode") to underset("pure")(Cu_((S)))("cathode")`
* Uses: This is the basis for an industrial process in which impure copper is converted into copper of high PURITY. the impure copper is made an anode that DISSOLVES on passing current and pure copper is deposited at the cathode.
Discussion
3729.

Xenon tetrafluoride, XeF_4is :

Answer»

tetrahedral and ACTS as a FLUORIDE DONOR with `SbF_5`
square PLANAR and acts as a fluoride donor with `PF_5`
square planar and acts as fluoride donor with NaF
see-saw SHAPE and acts as a fluoride donor with `AsF_5`

Answer :B
Discussion
3730.

Which of the following solid has maximum melting points?

Answer»

`NACL`
ICE
Dry ice
`SiO_(2)`

ANSWER :D
Discussion
3731.

What type of solids are glass, rubber and plastics ?

Answer»

SOLUTION :AMORPHOUS SOLIDS
Discussion
3732.

When anisole is heated with HI, the product is

Answer»

PHENYL IODIDE and METHYL iodide
Phenol AD methanol
Phenyl iodide and methanol
methyl iodide and phenol

Solution :
Discussion
3733.

When a pinch of sodium bicarbonate is added to carboxylic acid brisk effervescence is produced . This effervescence is produced due to evolution of

Answer»

`H_2` gas
`H_2O` vapours
`CO_2` gas
large amount of HEAT.

Solution :When a pinch of sodium bicarbonate is added to carboxylic acid FOLLOWING reaction take PLACE .
`underset("Carboxylic acid ")(RCOOH) + underset("bicarbonate")underset("Sodium")(NaHCO_(3)) to RCOONa + CO_2 uarr + H_(2) O`
Large amount of `CO_(2)` gas is released in the reaction which produces brisk effervescence .
Discussion
3734.

The Van't Hoff 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 GIVE ION in the solution.
Discussion
3735.

Whichis morebasic La(OH)_(3)or Lu (OH)_(3)? Why

Answer»

SOLUTION :`La(OH)_(3)`, due to lanthanide contraction, LOWER SIZE, more covalent character,N least basic.
Discussion
3736.

Which reagent reduce aldehyde and ketone Alcohol ?

Answer»

SODIUM BOROHYDRIDE `(NaBH_(4))`
Lithium ALUMINIUM hydride
(A) and (B) both
Hydrogen peroxide

Solution :(A) and (B) both
Discussion
3737.

Which gives blue bead in borax bead test:

Answer»

`CR^(2+)`
`Co^(2+)`
`NI^(2+)`
`CD^(2+)`

ANSWER :B
Discussion
3738.

Which of the following is a Hydride of Nitrogen

Answer»

`NH_(3)`
`N_(2)H_(4)`
`HN_(3)`
All

Solution :HYDRIDES of nitrogen `NH_(3),N_(2)H_(4),HN_(3)` etc
Discussion
3739.

Which of the following solutions having same concentration will have lowest pH value?

Answer»

KCl
`MgCl_(2)`
`AlCl_(3)`
`Na_(3)PO_(4)`

Solution :`As_(2)S_(3)` is a negatively charged sol. To cause its coagulation , the ions must be positively charged. Greater the MAGNITUDE of positive charged, greater will be its coagulating power. Thus `AlCl_(3)` containing `Al^(3+)` ion will be most effective in causing coagulation of `As_(2)S_(3)`.
Discussion
3740.

Write the role of I_2 in the Arkel method of refining.

Answer»

Solution :Zr to Ti is HEATED with iodine to form a VOLATILE compound which on HEATING DECOMPOSES to give PURE Zr or Ti.
`{:(Zr+2I_(2) to ZrI_(4)),(" (Impure)(Volatile) "),(ZrI_(4) overset(1800K)(to) Zr+2I_(2)),("Pure "):}`.
Discussion
3741.

Which of the following is/are correct for potassium ferrocyanide ?

Answer»

It GIVES a brown precipitate with `Cu^(2+)` ions.
It gives a white precipitate of mixed salt with `Ca^(2+)` ions.
It in EXCESS gives a BLUISH white/white precipitate with `Zn^(2+)`
It develops a deep red COLOURATION with `Fe^(3+)`

SOLUTION :N//A
Discussion
3742.

What are inner - transition elements ? Decide which of the given atomic numbers are the number of the inner transition elements:29, 59, 74,95, 102, 104.

Answer»

Solution :The f-block ELEMENTS , i.e., in which the last ELECTRON enters into f-subshells are called inner - transition elements. These INCLUDE lanthanoids ( 58- 71) and actinoids ( 90 - 103) . Thus, elements with atomic numbers 59 , 95 and 102are inner transition elements.
Discussion
3743.

The yeild of production ofA_2(g) + 2B(g)

Answer»

HIGH TEMPERATURE and high pressure
High temperature and LOW pressure
Low temperature and high pressure
Low temperature and low pressure

Answer :C
Discussion
3744.

Which of the following statement is/are false ?

Answer»

`Delta_rS` for `1/2Cl_2(g)toCl(g)` is POSITIVE
`DeltaElt0` for combustion of `CH_4(g)` in a sealed container with rigid adiabatic system
`DeltaG` is always ZERO for a REVERSIBLE process in a closed system
`DeltaG^@` for an ideal gas reaction is a FUNCTION of PRESSURE

Solution :`(A)Cl_(2_(g))to2Cl_((g)) " " ` randomness is increasing
(B) In closed container `DeltaV=0` hence work cone is zero.
There is no heat exchange . Hence `DeltaE=q+W=0`
( C)`DeltaG` will be zero only when equilibrium is reached.
`:.` not a function of pressure
(D)`DeltaG^@= - RT` In `K_(eq)`
`:.` not a function of pressure
Discussion
3745.

What are condensation polymers? Given an example.

Answer»

Solution :The POLYMERS that are formed by repeated condensation reaction between two different bi-functional ortrifunctional monomeric UNITS with the ELIMINATION of simple molecules like water, methyl alcohol, ammonia, hydrogen chloride etc are called as condensation polymers.
Example: Nylon-6,6 is formed by the condensation hexamethylene diammine with adipic acid.
`n H_(2)n(CH_(2))_(6)NH_(2)+n HCOOC(CH_(2))_(4)COOH to [-NH(CH_(2))_(6)NHCO(CH_(2))_(4)CO-]n +2nH_(2)O`
Discussion
3746.

Which of the following can reduce Tollen's reagent?

Answer»




SOLUTION :HEMIACETALS give Tollen's TEST fructse (`alpha`-hydroxy KETONE) also gives Tollen's test.
Discussion
3747.

Which halogen does form oxyacid:

Answer»

`Br_2`
`Cl_2`
`F_2`
`I_2`

ANSWER :C
Discussion
3748.

The vapour pressure of a 5% aqueous solution of a non-volatile organic substance at 373 K. Is 745 mm. Calculate the molecular mass of the solute.

Answer»

Solution :A 5% aqueous solution means 5 g of solute in 100 g of solution.
Mass of solution (WATER)=100-5=95g
Vapourt pressure of solution at 373 K = 745 MM
Vapour pressure of water at 373 K 760 mm
According to Raoult's Law, `=(p_(A)^(@)-P_(S))/P_(S)=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`((760mm-745mm))/((745mm))=(%5gxx(18g MOL^(-1)))/(M_(B)XX(95g))`
`15/745=((5g)xx(18gmol^(-1)))/(M_(B)xx(95g))`
`M_(B)=((5g)xx(18gmol^(-1))xx745)/((95g)xx15)=47 g mol^(-1)`
Discussion
3749.

Which reactions distinguish aldehydes and ketones ?

Answer»

Fehling.s SOLUTION
`H_2SO_4` solution
`NaHSO_3`
`NH_3`

ANSWER :A
Discussion
3750.

Washing soaps are potassium and sodium salts of :

Answer»

Formic, acetic and maleic acid
Oleic, palmitic and STEARIC acid
Sulphur, chlorine and FLUORINE
ACETONE, KETONE and quinones

Answer :B
Discussion