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52251.

__________ is extensively used as a moderator in nuclear reactors.

Answer»

`H_2O`
`H_2O_2`
`D_2O`
`D_2O_2`

ANSWER :C
Discussion
52252.

.......... is extansive property.

Answer»

MOLAR conductivily
Electro MOTIVE force
Resistance
Heat capacity

Answer :A
Discussion
52253.

.......... is done, when 50 gm of Fe is reacted with HCl in open vessel at 25°C temperature.

Answer»

ZERO
`-2.2` kJ
2.2 kJ
0.22 kJ

Solution :`W =-pv= -nRT`
`w= (-50)/( 55.85) xx 8.314 xx 298`
`w= - 2218.05 J= - 2.218` kJ
Discussion
52254.

........ is corrosion resistant alloy.

Answer»

14% LI + 1% MG
11% Mg + 14% Li
14.1% Mg + 1% Li
41% Mg + 1.4% Li

Answer :A
Discussion
52255.

……………………… is an ideal solution ?

Answer»

SOLUTION :Xhloro BENZENE & BROMO benzene
Discussion
52256.

_______ isanexcellentabdorbent ofcarbondioxide .

Answer»

`NAOH`
`KCL`
`KOH`
`KHCO_(3)`

Answer :C
Discussion
52257.

.................. is an example of viable particulate

Answer»

SOLUTION :BACTERIA
Discussion
52258.

___________ is an example of intra molecular hydrogen bonding.

Answer»

salicylaldehyde
hydrogen fluoride
para NITRO phenol
both a and c

Answer :A
Discussion
52259.

…………… is an example for gaseous solution.

Answer»

SOLUTION :CAMPHOR in NITROGEN GAS
Discussion
52260.

........ is added to get precipitation of alkaline earth metals from their solution of soluble salts.

Answer»

`Na_(2)CO_(3)`
`Li_(2)CO_(3)`
`H_(2)CO_(3)`
`K_(2)CO_(3)`

Solution :Precipitation can be carried out by addition of sodium CARBONATE or AMMONIUM carbonate.
Discussion
52261.

________ is a radioactive in group one elements

Answer»

SOLUTION :FRANCIUM
Discussion
52262.

___________ is a greenhouse gas

Answer»


ANSWER :A::B::C::D
Discussion
52263.

....... is a component of toothpaste.

Answer»

`Mg CO_(3)`
`MgCl_(2)`
`MgSO_(4)`
`Mg(OH)_(2)`

ANSWER :A
Discussion
52264.

.......... is a better dehydrohalogenating agent as compared to .........

Answer»

SOLUTION :`NaNH_2`, ALCOHOLIC KOH
Discussion
52265.

......... ion concentration increases blood pressure.

Answer»

LITHIUM
Sodium
Potassium
Magnesium

Answer :B
Discussion
52266.

……… inductive effect increase the acidic strength and …….inductive effect decreases the strength of -COOH

Answer»

SOLUTION :`(-I), (+I)`
Discussion
52267.

. Incorrect statement among the following is

Answer»

X is isopropyl BROMIDE, Y is n-propyl bromide
X and Y are positional isomers
FORMATION of X is electrophilic ADDITION
Formation of Y is electrophilic addition

SOLUTION :Formation of .y. is electrophilic addition
Discussion
52268.

-I effect is shown by

Answer»

`-CI`
`-Br`
both (a) and(B)
`-CH_(3)`

ANSWER :C
Discussion
52269.

+I effect (inductive effect) is shown by

Answer»

`-CH_(3)`
`-OH`
`-F`
`-C_(6)H_(5)`

SOLUTION :Among the given groups `-CH_3` shows +I effect
Discussion
52270.

…… hydrides are non-stoichiometric hydride

Answer»

`LaH_(2.87)`
`YbH_(2.55)`
`VH_(0.56)`
All of

ANSWER :D
Discussion
52271.

, How many 2^@ carbon present in above compound ?

Answer»


ANSWER :5
Discussion
52272.

. Here , A refers to

Answer»




all of these

Solution :
Discussion
52273.

. Here the major product X and Y are

Answer»

`ClCH_2 - CH_2Cl , ClCH_2 - CH_2Cl`
`ClCH_2 - CH_2Cl, ClCH_2 - CH_2OH`
`Cl_2C = C Cl_2 , CLCH= CHCL`
`Cl_2 C = C Cl_2 , ClCH_2 - CH_2OH`

SOLUTION :`ClCH_2 - CH_2 - CL, ClCH_2 - CH_2OH`
Discussion
52274.

+ HBrto Product :

Answer»




SOLUTION :PROPYL BROMIDE
Discussion
52275.

__________ haswideapplicationinpurificationof sugar.

Answer»

`CA(OH)_(2)`
`CaCl_(2)`
`CAO`
`CaCO_(3)`

Answer :C
Discussion
52276.

........... has liquid state at STP.

Answer»

`H_(2)`<BR>`Br_(2)`
`O_(2)`
Fe

Answer :B
Discussion
52277.

.......... has given Delta G = Delta H- T Delta S.

Answer»

Faraday
Kirchof
Einstein
Gibs HELM holtz

Answer :D
Discussion
52278.

......... has a capacity to stop the flow of oxygen.

Answer»

SOLUTION :CARBON MONOXIDE
Discussion
52279.

………. group elements give saline hydrides.

Answer»

s
p
d
f

Answer :A
Discussion
52280.

……….. group elements give saltlike hydride.

Answer»

SOLUTION :S GROUP
Discussion
52281.

................... group is ortho para directing and deactivating group,

Answer»

amino
methyl
HALOGEN
aldehyde

Solution :halogen
Discussion
52282.

........ gas is used in aircondition.

Answer»

SOLUTION :Chloroflourocarbon (CFCS)
Discussion
52283.

............. gas potentially damage plant leaves and retard photosynthesis.

Answer»

SOLUTION :`NO_(2)`
Discussion
52284.

.... element is distinct from its group elements.

Answer»

Be
Ca
Sr
RA

ANSWER :A
Discussion
52285.

………. % dihydrogen is added in CNG.

Answer»

1
2
3
4

Answer :D
Discussion
52286.

____________ density of ice compared with water at 0^(@)C

Answer»

HIGHER
LOWER
retained
more

Answer :B
Discussion
52287.

The net work done by the system ____

Answer»

SOLUTION :EXPANSION WORK
Discussion
52288.

……… covers more than 70% of the earth's surface.

Answer»

SOLUTION :SEAWATER
Discussion
52289.

. Compounds is : C. Compound ( C) is :

Answer»




SOLUTION :
Discussion
52290.

. Compound (B) and (C) are

Answer»




(B) is (II) and (C) (III)

Solution :Hydrogenation of the triple bond to double bond by Lindlar.s catalyst or by P-2 or BROWN catalyst, i.e `H_2 + Ni_2 B` TAKES place by SYN addition, so product is CIS,cis(II).
Discussion
52291.

.......... Common unit is used for volume.

Answer»

`"(METER)"^(3)`
litre
pascal
atmosphere

Answer :B
Discussion
52292.

{:(, "column"-I,, "column-II"),((a) ,Fe^(2+), (p) ,"Set of quantum no . for last"e^(-)"is" n=2","l=1","),((b),Mn^(+4),(q),"magnetic moment "(mu)="zero"),((c ) , Zn^(+2),(r),"Spin muliplicaity (SM)=4"),((d),Na^(+),(s),"total no. of exchange pairs in 3d - subshell =10"),(,,(t),"paramagnetic species"):}

Answer»


SOLUTION :N/a
Discussion
52293.

{:(" Column I ( Crystal system)", "( Column II (Axial ratio)"),("(A) Tetragonal", "(p)" a ne b ne c"," alpha = beta = gamma = 90^(@)),("(B) Rhombic" , "(q)" a = b ne c"," alpha = beta = gamma = 90^(@)),("(C)Monoclinic" , "(r)" a ne b ne c"," alpha ne beta ne gamma ne 90^(@)),("(D) Triclinic" , "(s)"a ne b ne c"," alpha = gamma = 90^(@) ne beta):}

Answer»

A-s , B-r , C-p, D-q
A-q , B-r , C-q , D-p
A-r, B-p, C-q, D-s
A-p , B-q , C-r , D-s

ANSWER :b
Discussion
52294.

{:("Column-I",,"Column-II"),("A) Esters and Carboxylic acid",,"P) Chain isomerism"),("B) n-Butanol and Iso butanol",,"Q) Tautomerism"),("C) Acetone and 2-propenol",,"R) Functional Isomerism"),("D) Maleic acid and fumeric acid",,"S) Geometrical Isomerism"):}

Answer»


SOLUTION :ESTER and Carboxylic acids are Functional isomers.
n-Butanol and Isobutanol are CHAIN isomers Acetone and 2-propenol are Tautomers Maleic acid and Fumaric acid are geometrical isomers
Discussion
52295.

{:("Column-I",,"Column-II"),("A) "C_(7)H_(16)"(No. of structural isomers)",,"P) 6"),("B) "C_(2)FCl" Br I(No. of structural isomers)",,"Q) 3"),("C) "C_(6)H_(4)" Br Cl(No. of Benzonoid Aromatic isomers)",,"R) 5"),("D) "C_(5)H_(10)"No. of cyclic isomers)",,"S) 9"):}

Answer»


SOLUTION :A-S,B-P,C-Q,D-R
Discussion
52296.

{:(" Column -I" , "Column -II") ,( (A)" pH of a basic buffer mixture ", (P) pK_a+log"" (["salt"])/(["Acid"])),((B) "pH of an acidic buffer mixture ",(Q) (pK_a)_(C,Acid) +log""(["Base"])/(["salt"])),((C) "pH of salt solution of weak acid + strong base ", ( R ) (1)/(2) [pK_(W) +pK_a+logc)), ((D) "pH of a salt solution of strong acid + weak base ", (S) (1)/(2) [pK_W -pK_b -log c ]):}

Answer»


Solution :Basic BUFFER ` to POH =pKb+ log ""(S)/(B) `
` rArr PH =(pK_a) +log ""( B)/(S) ` ACID buffer ` to pH =pK_a +log ""(S)/(A) `
`WA + SB rArr ` anion hydrolysis
`rArr pH =7+ ((pKa+ logc )/( 2))`
` WB+SA rArr ` cation hydrolysis
` rArr pH =7- ((pK_b+log c)/( 2))`
`WB +SA rArr ` cation hydrolysis
` rArr pH= 7- ((pK_b+log c)/(2))`
Discussion
52297.

What is the pH of a salt which was produced by a strong acid and a strong base ?

Answer»


Solution :Basic BUFFER ` to pOH =PKB+ log ""(S)/(B) `
` rArr PH =(pK_a) +log ""( B)/(S) ` acid buffer ` to pH =pK_a +log ""(S)/(A) `
`WA + SB rArr ` anion hydrolysis
`rArr pH =7+ ((pKa+ LOGC )/( 2))`
` WB+SA rArr ` cation hydrolysis
` rArr pH =7- ((pK_b+log c)/( 2))`
`WB +SA rArr ` cation hydrolysis
` rArr pH= 7- ((pK_b+log c)/(2))`
Discussion
52298.

{:("Column-I (Benzene derivative)",,"Column-II (No. of isomersTheoretical)"),("A) Dichloroborazine",,"P) 3"),("B) Bromochloroborazine",,"Q) 4"),("C) Trichlorobenzene",,"R) 6"),("D) Bromodichlorobenzene",,"S) 8"):}

Answer»


SOLUTION :A-Q,B-R,C-P,D-R
Discussion
52299.

{:("List-I","List-II"),((A) 1xx10^(-8) "M KOH",P.pH=1.3),((B)1xx10^(-8)"MHBr" ,Q.pH=6.95),((C )1"MHCI"+1 "MNaOH",R.pH=7.0414),((D) 0.02 MH_(2)SO_(4),S.pH=7),(,"acidic solution"):}

Answer»


Solution :KOH is basic ,HBr is acidic
` HCl + NAOH ` complete NEUTRALISATION
` 0.02 M H_2SO_4 RARR [H^(+) ] =0.04 `
` rArr pH = 2 - log 4 = 1.4`
Discussion
52300.

{:(""CHO),("|"),(""H-C-OH),("|"),(A overset(H_(2)//NI)rarrHO-C-Hoverset("Heating with HI")rarrB),("|"),(""H-C-OH),("|"),(""H-C-OH),("|"),(""CH_(2)OH):} A and B can be :

Answer»

Both are n-Hexane
Both are Hexan-1,2,3,4,5,6-hexaol
A is n-Hexane B is Hexan-1,2,3,4,5,6-hexaol
A is Hexan-1,2,3,4,5,6-hexaol and B is n-Hexane

Answer :D
Discussion