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22701.

When a liquid is heated its vapour pressure

Answer»

continuously INCREASES
continuously decreases
increase and BECOMES CONSTANT at b.pt of LIQUID
records no PREDICTABLE change

Solution :It is a fact.
Discussion
22702.

The spontaneous flow of heat is always

Answer»

From LOW to HIGH pressure
From high to high pressure
Unidirectional from lower temperature to higher temperature
Unidirectional from the higher to lower temperature

SOLUTION :HEAT is always flow from the HIGHEST to lower temperature.
Discussion
22703.

Which of the following is Dow's reaction ?

Answer»




ANSWER :B
Discussion
22704.

Which of the following aqueous solution has the higherst boiling point ?

Answer»

`"0.1 M KNO"_(3)`
`"0.1 M "Na_(3)PO_(4)`
`0.1M BaCl_(2)`
`.1 M K_(2)SO_(4)`

Solution :Higher the CONCENTRATION of ions in the solution. Higher is the elevation in boiling point. As 0.1 M `Na_(3)PO_(4)`has highest concentration of ions, elevation of boiling point is highest for 0.1 M `Na_(3)PO_(4)` and so is the boiling point. ALTERNATIVELY, `DeltaT_(b)=iK_(b)m`. For the same VALUE of m, higher is the value of i, higher is `DeltaT_(b)`.
Discussion
22705.

The value of K_f for water is 1.86 calculated from glucose solution . The value of K_f for water calculated for NaCl solution will be :

Answer»

`=1.86`
`LT 1.86`
`GT 1.86`
Zero

Answer :A
Discussion
22706.

Which will make basic buffer?

Answer»

`50 ML` of `0.1M" "NaOH+25mL` of `0.1M" "CH_3 COOH`
`100 mL` of `0.1M" " CH_3 COOH+100 mL` of `0.1M" " NH_4 OH`
`100 mL` of `0.1M"" HCI+200 mL` of `0.1 M" " NH_4 OH`
`100 mL` of `0.1M"" HCI+100 mL` of `0.1M"" NaOH`

ANSWER :C
Discussion
22707.

Which of the following compounds have 10 isomers-

Answer»

`Cl_2C_6H_3NH_2`
`CH_3C_6H_4NO_2`
`BrClC_6H_3CHO`
`O_2NC_6H_3BrCH_3`

ANSWER :C::D
Discussion
22708.

The reagents like AgNO_(3),K_(4)[Fe(CN)_(6)],KCNS,KI,K_(2)CrO_(4) Nessler's ect, find extenstive and very important applicasionin quentitative analysis because these resgents form different type of produce with different cation for axample KI form yellow precipitate with Pb^(2+) but at form red iprecipitate with Hg^(2+) , Hence these reagents are widelyused in the quantitative amalysis of morgenic salts Which of the following hydroxide does not dissolve in ammounts solutionbut sisolves in sodiumhydroxide ?

Answer»

`ZN(OH)_(2)`
`Cd(OH)_(2)`
`Cu(OH)_(2)`
`AI(OH)_(3)`

Solution :`Zn(OH)_(2)` dissolves in both `NaOH` and `NH_(3)` forming `[Zn(OH)_(4)]^(2-)` and `[Zn(NH_(3))_(4)]^(2+)` RESPECTIVELY .
(B) `Cd(OH)_(2)` dissolves in ammonic but does not disolve in `NaOH`
(c ) `Cu(OH)_(2) + NH_(3) rarr [Cu(NH_(3))_(4)]^(2+)`, which is a soluble complax butdoes notdissolve in `NaOH`.
(d) `AI(OH)_(3) + OH^(Theta) rarr [AI(OH)_(4)]^(Theta)`.Which is a soluble complaxbut does not dissolve in `NH_(3)`.
Discussion
22709.

Which of the following cation forms inner orbital octahedral complex with NH_(3) ?

Answer»

`Ni^(2+)`
`Fe_(2+)`
`Pt_(2+)`
`Pt_(4+)`

ANSWER :D
Discussion
22710.

The reagents like AgNO_(3),K_(4)[fe(CN)_(6)],KCNS,KI,K_(2)CrO_(4) Nessler's ect, find extenstive and very important applicasionin quentitative analysis because these resgents form different type of produce with different cation for axample KI form yellow precipitate with Pb^(2+) but at form red iprecipitate with Hg^(2+) , Hence these reagents are widelyused in the quantitative amalysis of morgenic salts Which of the following cation (i.e. basic radicals) forms coloured (not white) percipitates with aqueous solution ofpotassium indide the precipitete does notdissolveis exiess og reagent?

Answer»

`Hg^(2+)`
`Hg_(2)^(2+)`
`BI^(3+)`
`Cu^(2+)`

Solution :(a) `Hg^(2+) + 21^(Theta) rarr HgI_(2) darr (red //"scalet")`
`HgI_(2) + 21^(Theta) rarr [HgI_(4)]^(2-)` (soluble complax)
(b).`Hg_(2)^(2+) + 2I^(Theta) rarr Hg_(2)I_(2) darr` (green)
`Hg_(2)I_(2) + 21^(Theta) rarr [HgI_(4)]^(2-) + Hg darr` (BLACK).
(c). `Bi^(3+) + 3I^(Theta) rarr BIi_(3) darr` (black)
`BiI_(3) darr + 1^(Theta)[BiI_(4)]^(Theta)` (orange colour soluble complex)
(d).`2Cu^(2+) + 5I^(Theta) rarr 2CuI darr (white) + 1_(3)^(Theta)`
Discussion
22711.

The reagents like AgNO_(3),K_(4)[Fe(CN)_(6)],KCNS,KI,K_(2)CrO_(4) Nessler's ect, find extenstive and very important applicasionin quentitative analysis because these resgents form different type of produce with different cation for axample KI form yellow precipitate with Pb^(2+) but at form red iprecipitate with Hg^(2+) , Hence these reagents are widelyused in the quantitative amalysis of morgenic salts Which of the following is not currectly matched ?

Answer»

`Ag^(o+) + S_(2)O_(3)^(2-) rarr `WHITE ppt.
`Pb_((aq))^(2+)2CI_((aq))^(Θ) rarr` Black perecipitate
`Bil_(3)("Black preciplate") + H_(2)O(1) overset(Delta)rarr` orange turbidity
`Ca_((aq))^(2+) + K_(4)[Fe(CN)_(6)]_(aq) rarr` white precipitate

Solution :(a)`Ag^(o+)+S_(2)O_(3)^(2-) rarr Ag_(2)S_(2)O_(3)` (white ppt)
B. `Pb_((aq))^(2+)+ 2CI_ (aq)^(Theta) rarr PbCI_(2)`
c. `BiI_(1) darr ("black precipitate") + H_(2)O overset(Delta) to underset(("Orange"))(BIOI darr)`
d. `Ca^(2+) + 2K^(o+) + [Fe(CN)_(6)]^(4-) rarr underset(("White"))(K_(2)Ca[Fe(CN)_(6)) darr)`
Discussion
22712.

Which of the following is incorrect for 17 gm/L of H_(2)O_(2) solution.

Answer»

Volume strength is 5.6 V
Molarity of solution is 0.5M
1ml of this solution GIVES 2.8 ml `O_(2)` at 273 K and 2 atm
The molarity of solution is 2M

Solution :17 gm/L `H_(2)O_(2)` solution `rArrM=(1)/(2)M`
=0.5M
volume strenght =11.2xxM
=11.2xx0.5=5.6
so 1 ml solution gives 5.6 ml `O_(2)` at 273K `& 1atm`
=2.8 ml `O_(2)` at 273 and 2 atm
Discussion
22713.

Which of the following polymers of glucose is stored by animals?

Answer»

Cellulose
Amylose
Amylopectin
GLYCOGEN

Solution :Glycogen , a polymer of glucose is stored in ANIMAL BODY.
Discussion
22714.

Which is the weakest acid in the following :

Answer»

`CH_(3)OH`
`(CH_(3))_(2)CH-OH`
`CH_(3)CH_(2)OH`
`(CH_(3))_(3)C-OH`.

ANSWER :D
Discussion
22715.

Which is the hottest part of the flame?

Answer»

BLUE zone
zone of partial COMBUSTION
zone of complete combustion
zone of no combustion

Solution :The UPPERMOST part of the FLAME, the zone of complete combustion is the hottest part.
Discussion
22716.

Which of the chelating ligands maintain hapticity equal to denticity ?

Answer»

`eta^(5)-C_(5)H_(5)`
`eta^(6)-C_(6)H_(6)`
`eta^(2)-NO_(3)^(-)`
`eta^(2)-CO_(3)^(2-)`

Solution :`NO_(3)^(-)` and `CO_(3)^(2-)` are flexidentate ligands.
Discussion
22717.

Which one is more acidic ?

Answer»

`Al_2O_3`
`Na_2O`
MgO
CaO

Answer :A
Discussion
22718.

What reaction is used for converting a primary amide into a primary amine containing one carbon atom less than the parent amide ?

Answer»

SOLUTION :Hofmann-bromamide REACTION, e.g.,
Discussion
22719.

What are the steps involved in the extraction of aluminium from bauxite?

Answer»

Solution :Aluminium is usually EXTRACTED from bauxite, `Al_(2)O_(3),2H_(2)O`.
The extraction involves the following steps:
(1) Purification (or concentration) of bauxite ore :
(a) Baeyer's process : Red variety of bauxite containing iron oxide as the main impurity is purified by Baeyer's process.
(b) Hall's process (Dry process) : Red bauxite is purified also by this method.
(c) Serpeck's process : Bauxite ore containing silica as the chief impurity is purified by this process.
Generally Hall's process is widely used for the purification of bauxite by fusing at high TEMPERATURE with `Na_(2)CO_(3)` in the presence of little lime, wvhen alumina, `Al_(2),O_(3)`dissolveformingsolubesodiumaluminate `NaAlO_(2)` .The filtrate of `NaAlO_(2)`is HEATED to 323-373k anda stram of `CO_(2)`is passedwhen `Al(OH_(3))` is precipitated.
`Al(OH_(3))` pprecipitated is filtered, washed and ignited at 1473 K to obtain pure alumina, `Al_(2)O_(3)`.
`underset("Bauxite")(Al_(2)O_(3)).2H_(2)O + Na_(2)CO_(3) overset(Delta)to2NaAlO_(2) + CO_(2) = 2H_(2)O`
`2NaAlO_(2) + 3H_(2) O + CO_(2)overset(323 - 373 k) tounderset(ppt)(2Al)(OH)_(3) + Na_(2)CO_(3)`
`2Al(OH)_(3) overset(1473k)to underset("pure alumina")(Al_(2)O_(3)) + 3H_(2)O`
(2)Electrolysis of fused alumina (Hall and Heroult's process) :
Purified alumina is dissolved in molten synthetic cryolite, `Na_(3)AlF_(6)`, and fused mixture is electrolysed with carbon electrodes.
The molten electrolyte is covered with a layer of powdered coke to prevent the oxidation and loss of heat by radiation.

(3) Reactionsof electrolysis :
`Na_(3)AIF_(6(l)) hArr 3NaF_((1)) + AIF_(3(1))`
`AIF_(3(I)) hArr Al^(3+) + 3F^(-)`
At cathode `: Al^(3+) + 3e^(-) to Al ""("reduce")`
At anode `F^(-) to F + e^(-) ""(2F to F_(2(g)))`
LIBERATED `F_(2)`reactswithaluminaand forms `AIF_(3)` .
`2Al_(2) O_(3)+ 6F to4AIF_(3) + 3O_(2)`
Theliberatedoxygenreacts with carbon of anodeformingCO and `CO_(2)`
Moltenaluminiumcollectedat thebottomof the cellis priodicallyremoved.
(4) Refiningof aluminium : Aluminiumis further purifiedby Hoop'selectrolyticprocess.
The lowestlayeris of impuraluminiumand with carbon liningit formsan anode . Themiddlelayerconsistof a mixtureof cryolite, andNaF and server as anelectrolyt. Thetop layeris fo puremoltenaluminiumhavingcarbonelectrodes dippingin itwhichact as cathode.
Duringelectrolysis `Al^(3+)`ions form middlelayerpass intotop layerandgetreducedat cathodeof formingpurealuminium. At thesame time,an equivlantamount of `Al^(3)` ions form thelowestlayer pass intomiddle layerbut impurities are leftin thelowestlayer.
Thus,purealuminiumproudced , is periodically romovedform the top .
Discussion
22720.

Which is an example of ferroelectric compound ?

Answer»

QUARTZ
`PbCrO_4`
BARIUM titanate
None

Answer :C
Discussion
22721.

Which one is malachite from the following ?

Answer»

`CuCO_3 CDOT Cu(OH)_(2)`
`CuFeS_2`
`Cu(OH)_2`
`Fe_3O_4`

SOLUTION :MALACHITE : `CuCO_3 cdot Cu(OH)_2`
Discussion
22722.

Which of the following bases is not present in DNA

Answer»

ADENINE
thymine
Cytosine
URACIL

Solution :Uracil is not PRESENT in DNA.
Discussion
22723.

Which is one the correct order of strength of carboxylic acid?

Answer»

`H- oversetunderset(||)(O)(C ) - OH gt CH_3 - oversetunderset(||)(O)(C ) - OH gt CH_3-CH_2- oversetunderset(||)(O)(C ) -OH`
`CH_3- oversetunderset(||)(O)(C ) - OH LT H - oversetunderset(||)(O)(C ) -OH gt CH_3-CH_2- oversetunderset(||)(O)(C ) - OH`
`CH_3-oversetunderset(||)(O)(C ) - OH gt CH_3 - CH_2 -oversetunderset(||)(O)(C ) - OH gt H - oversetunderset(||)(O)(C ) - OH`
`CH_3-CH_2 - oversetunderset(||)(O)(C ) - OH gt H - oversetunderset(||)(C ) - OH gt CH_3 - oversetunderset(||)(O) (C ) -OH`

Solution :`H- oversetunderset(||)(O)(C ) - OH gt CH_3 - oversetunderset(||)(O)(C ) - OH gt CH_3-CH_2- oversetunderset(||)(O)(C ) -OH`
Discussion
22724.

Which statement is not correct about alcohol

Answer»

Alcohol is lighter than water
Alcohol EVAPORATES quickly
Alcohol of less no. of carbon ATOMS is less SOLUBLE in water than alcohol of HIGH no. of carbon atoms
All of these

Solution :Alcohols having less number of carbon atoms are more soluble in water.
Discussion
22725.

Which of the following compound number of p pi-dpi bond is equal to number of p pi-d pi bond?

Answer»

`SO_(2)`
`CO_(2)`
`SO_(3)`
`SOCl_(2)`

ANSWER :A
Discussion
22726.

Which of the following is provitamin A

Answer»

Carotene
Calciferol
Ascorbic acids
Ergosterol

Answer :A
Discussion
22727.

Thermal decomposition method is used to purify:

Answer»

NI
Ti
Zr
Cr

Answer :A
Discussion
22728.

Towards electrophilic substitution the most reactive species will be :

Answer»




ANSWER :A
Discussion
22729.

Three dimensional molecules with cross links are formed in the case of a___________.

Answer»

thermoplastic
thermosetting PLASTIC
NORMAL PLASTICS
all of these

Answer :B
Discussion
22730.

Which of following oxide is used for estimation of carbon monoxide?

Answer»

`IO_(2)`
`I_(2)O_(4)`
`I_(2)O_(7)`
`I_(2)O_(5)`

Answer :D
Discussion
22731.

Which of the following pairs of metals would liberate hydrogen gas with dilute nitric acid ?

Answer»

MN,Cu
Mn,Mg
Zn,Mg
Fe,Cu

Answer :B
Discussion
22732.

Which one of the following is the strongest acid

Answer»

2-nitrophenol
4-chlorophenol
4-nitrophenol
3-nitrophenol

ANSWER :C
Discussion
22733.

Trimethylamine is more basic than dimethylamine.

Answer»

SOLUTION : TRIMETHYLAMINE is LESS BASIC than DIMETHYLAMINE.
Discussion
22734.

There will be three different flourine-flourine distance in molecules CF_2 (C )_2CH_2.Assuming ideal bond angles for a particular hybridisation (assume no distortion due to double bonds) find out the smaller flourine-flourine distance and fill the result (in pm) in the increasing order in your answer sheet.Round off your answer to the nearest whole number. (Given that C-F bond length =134 pm, C=C bond length =134 pm sqrt3=1.73)

Answer»


SOLUTION :
`d_1=2xx134xxsin60^@ "PM"=231.8"pm"=232"pm"`
Discussion
22735.

Which of the following is homoleptic complex

Answer»

`[CO(NH_3)_6]Cl_3`
`[Co(NH_3)_4Cl_2]CL`
`[Co(NH_3)_3Cl_3]`
`[Co(NH_3)_5Cl]Cl_2`

ANSWER :A
Discussion
22736.

Violet colour appear in glass when we add-

Answer»

`Cr^(3+)`
`Mn^(4+)`
`I_(2)`
`K^(+)`

SOLUTION :`"Cr"^(3+)` GIVES violet colour (ACCORDING table in NCERT Class XII pg 222)
Discussion
22737.

Which of the following will be able to show geometric isomerism ?

Answer»

MABCD - Tetrahedral
MABCD - Square PLANER
`MA_2B_2` - Tetrahedral
`MA_3 B `- Square planar

Solution :Tetrahedral complexes do not show geometrical isomerism because relative POSITION of unintended ligands attached to central metal atom are same with respect to each other.
So, option (a) and (c ) are not correct.
Square planar complex `MA_3B` do not show geometrical isomersm becasue the possible speatial arrangement are EQUIVALENT.
Square planar complex MABCD type form three iosmer (cis-TRANS isomers), two of these are C is and one is trans.
Discussion
22738.

Which one is a polyprotic acid :

Answer»

ACETIC ACID
Oxalic acid
BENZOIC acid
SALICYLIC acid

ANSWER :B
Discussion
22739.

Write the name of gas released when Cu added to dilute HNO_(3)

Answer»

SOLUTION :NO gas/Nitric OXIDE
Discussion
22740.

Which liberates SO_2 with dilute H_2SO_4

Answer»

`Na_2SO_4`
`NaHSO_4`
`Na_2SO_3`
`Na_2s`

ANSWER :C
Discussion
22741.

What do the notations G and G* represent ?

Answer»

SOLUTION :G represents CONDUCTANCE of a substance. G* represents the CELL constant.
Discussion
22742.

Which of the following statements are applicable to a balanced chemical equation of an elementary reaction ?

Answer»

ORDER is same as molecularity
Order is LESS than the molecularity
Order is GRATER than the molecularity
Molecularity can NEVER be zero.

Answer :A::D
Discussion
22743.

Write the reduction and oxidation half reactions for Daniell cell.

Answer»

Solution :(i) `CU^(2+) + 2e^(-) to Cu` (s) (REDUCTION half reaction)
(II)`Zn (s) to Zn^(2+) (aq) + 2e^(-)`(oxidation half reaction)
Discussion
22744.

Which of the following reactions gives H_(2)C=C=C=CH_(2)

Answer»

`CH_(2)Br-CBr=CH_(2)overset(ZN//CH_(3)OH)to`
`HC-=C-CH_(2)-COOHunderset(40^(@)C)overset(Aq.K_(2)CO_(3))to`
`CH_(2)Br-C-=C-CH_(2)Brunderset("HEAT")overset(Zn)to`
`2CH_(2)=CH-CH_(2)-Ito`

Solution :`CH_(2)Br-C-=C-CH_(2)Br underset(DELTA)overset(Zn)toCH_(2)=C=C=CH_(2)`.
Discussion
22745.

Which is not correct for catalyst It :

Answer»

ENHANCES the RATE of REACTION in both directions
Changes ENTHALPY of reaction
Reduces activation energy of reaction
Specific in nature

Answer :B
Discussion
22746.

Which of the following can disperse benzene in water?

Answer»




ANSWER :C
Discussion
22747.

Which of following reagents does not give isobutane when reacted with isobutyl magnesium bromide?

Answer»

`CH_(3)-C-=CH`
`CH_(3)-OVERSET(O)overset(||)C-CH_(2)-overset(O)overset(||)C-O-CH_(3)`
`CH_(3)-CH_(2)-OH`
`PhOCH_(3)`

ANSWER :D
Discussion
22748.

Which one of the following two methods is appropriate for the preparation of neopentyl chloride (Me_(3)C CH_(2)Cl) and why? (1) (CH_3)_(3)C CH_(2)Ohoverset(HCl)rarr (CH_3)_(3)C CH_(2)Cl+H_(2)O (ii) (CH_3)_(4)Coverset(Cl_(2)//hv)(rarr)(CH_3)_(3)C CH_(2)Cl+HCl

Answer»

Solution :All the H-atoms of neopentane `(Me_(4)C)` are equivalent and the intermediate radical does not undergo rearrangement. So, the second method leads to the formation of neopentyl chloride as the only product. This method is, therefore, appropriate for the preparation of neopentyl chloride.

On the other hand in the first reaction, the interediate `1^(@)` carbocation is highly unstabel and READILY rearranges to a more STABLE `3^(@)` carbocation. So, 2-chloro-2-methylbutane is OBTAINED ALMOST exclusively instead of neopentyl chloride. Therefore, the first method is not appropriate for the preparation of neopentyl chloride.
.
Discussion
22749.

To get n-type doped semiconductor, the impurity to be added to silicon should have the following number of valence electrons ?

Answer»

5
2
1
3

Solution :When a pure semiconductor of Ge or SI is doped with a controlled amount of pentavalent atoms, say arsenic or phosphorus or ANTIMONY or BISMUTH, it is called N-type semiconductor because the conduction of electricity in such semiconductor is due to MOTION of ELECTRONS i.e., negative charges.
Discussion
22750.

Which of the following is proteins:

Answer»

TERRY cotton
Natural silk
Nylon
Reyon

Answer :A
Discussion