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6701.

Which of the following does not decolourise bromine solution in carbon disulphide

Answer»

Acetylene
Propene
ETHANE
Propyne

SOLUTION :Ethane does not decolouise BROMINE solution because it is a SATURATED COMPOUND
Discussion
6702.

Which one of the following is used to absorb colourants from sugar?

Answer»

SILICA gel
Magnesia
CHARCOAL
Alumina

Solution :Charcoal
Discussion
6703.

When uncertainty in position and momentum are equal, then uncertainty in velocity is

Answer»

`sqrt(h/(PI))`
`1/2 sqrt(h/(pi))`
`1/(2M)sqrt(h/(pi))`
`2m sqrt(h/(pi))`

SOLUTION :Let `Deltax=Deltap=x`
`:.Deltax xx Deltap=h/(4pi)`
`x xx x =h/(RPI) `or `x^(2)=h/(4pi)`
`x=1/2s at (h/(pi))`
Now `x=mv`
`:.v=1/(2m)sqrt(h/(pi))`
Discussion
6704.

Which is amphoteric compound ?

Answer»

`Cr_2O_3`
`Al_2O_3`
`Mn_2O_3`
`Fe_2O_3`

ANSWER :B
Discussion
6705.

The shape of CHCl_3 molecule is :

Answer»

Pyramidal
Linear
Tertrahedral
Trigonal pyramidal

Answer :C
Discussion
6706.

When a zinc metal strip is placed in a copper sulphate solution the blue colour of the solution fades and copper is deposited on the zinc strip as red -brown crust. The oxidation half cell reaction of the above process is represented as _________.

Answer»

`Cu_((aq))^(2+)+2E^(-) RARR Cu_((s))`
`Cu_((s)) rarr Cu^(2+)+2e^(-)`
`Zn_((s)) rarr Zn_((aq))^(2+)+2e^(-)`
`Zn_((aq))^(2+)+2e^(-) rarr Zn_((s))`

ANSWER :C
Discussion
6707.

Violet coloured complex The formula of the complex formed in the above reaction, is

Answer»

`[Fe(OC_(6)H_(5))_(3)]^(3-)`
`[Fe(OC_(6)H_(5))_(3)]^(3+)`
`[Fe(OC_(6)H_(5))_(6)]^(3-)`
`[Fe(OC_(6)H_(5))_(6)]^(3+)`

SOLUTION :`Fe(OC_(6)H_(5))_(6)]^(3-)`
Discussion
6708.

Whichwillweighmore at STP:

Answer»

ONE LITRE of 02
One litre of H,
One litre ofN2
One litre of Cl2

Answer :D
Discussion
6709.

Which is not possible product of heating of ortho boric acid.

Answer»

`H_(2)B_(2)O_(6)`
`H_(2)B_(4)O_(7)`
`HBO_(2)`
`B_(2)O_(3)`

Solution :`H_(3)BO_(3)OVERSET(Delta)(rarr)HBO_(2)overset(Delta)(rarr)H_(2)B_(4)O_(7)overset(Delta)(rarr)B_(2)O_(3)`
Discussion
6710.

Which gas is essential constituent of almost all fuel gases?

Answer»

`CO_2`
`N_2`
`CO`
`H_2O`

ANSWER :C
Discussion
6711.

Which of the following thermodynamic relations is correct?

Answer»

dG = VDP-SDT
dE = PDV + TdS
dH=-VdP + TdS
dG = VdP + SdT

SOLUTION :dG = VdP-SdT
Discussion
6712.

What is the effect of denaturation on the structure of proteins ?

Answer»

Solution :Protein found in biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native FORM, is subjected to PHYSICAL change like change in temperature or chemical change like change in pH, the hydrogen bonds are disturbed. Due to this, the globules unfold and HELIX GET uncoiled and protein loses its biological activity. This is called denaturation of proteins.
During denaturation of `2^(@) and 3^(@)` proteins, the structures are destroyed but `1^(@)` structure remains intact. The coagulation of egg white on boiling is a common example of denaturation. Another example is curdling of milk which is caused due to formation of lactic acid by the bacteria present in milk.
Discussion
6713.

While assigning R,S configuration the correct order of priority of groups attached to chiral carbon atom is

Answer»

`CONH_(2) GT COCH_(3) gt CH_(2)OH gt CHO`
`CONH_(2) gt COCH_(3) gt CHO gt CH_(2)OH`
`COCH_(3) gt CONH_(2) gt CHO gt CH_(2)OH`
`CHO gt CH_(2)OH gt COCH_(3) gt CONH_(2)`

Answer :B
Discussion
6714.

When 50 cm^(3) of 0.2 N H_(2)SO_(4) is mixed with 50 cm^(3) of IN KOH, the heat liberated is

Answer»

11.46 KJ
 57.3 kJ
573 kJ
573 J.

Answer :D
Discussion
6715.

Two gas cylinders having same capacity have been filled with 44 g of H_(2) and 44g of CO_(2) respectively. If the pressure in CO_(2) cylinder is 1 atmosphere at a particular temperature, the pressure in the hydrogen cylinder at the same temperature is

Answer»

2 atmosphere
1 atmosphere
22 atmosphere
44 atmosphere

Solution :44gg of `H_(2)=22` MOL `H_(2)`
44G of `CO_(2)=1` mol `CO_(2)`
`because` Pressure of 1 mol `CO_(2)=1` atm.
`therefore` Pressure of 22 mol. `H_(2)=22` atm.
Discussion
6716.

Which of the following will produce red color whentreated with (NH_(4))_(2)[Ce(NO_(3))_(6)]?

Answer»

`CH_(3)OH`


`PHOH`

Solution :In ceric ammonium nitrate test alcohol produce red color DUE to formation of `(NH_(4))_(2)[Ce(OR)(NO_(3))_(5)]` while phenol produces BROWN.
Discussion
6717.

Under identical conditions, the S_(N^(1)) reaction will occur most efficiently with :

Answer»

tert - BUTYL CHLORIDE
1-chlorobutane
2 - methyl - 1- CHLOROPROPANE
2- chlorobutane

Answer :A
Discussion
6718.

Which of the following is produced by reaction of RCN in sodium and alcohol ?

Answer»

`RCONH_(2)`
`RCO OVERSET(-)(O) NH_(4)^(+)`
`RCH_(2)NH_(2)`
`R(CH_(2))_(3) NH_(2)`

SOLUTION :`R-C equiv N+4[H] overset(Na//C_(2)H_(5)OH)(rarr) RCH_(2)NH_(2)`
Discussion
6719.

When excess of SnCI_(2)is addedto asoinof HgCI_(2)a whiteppt turninggrayis obtainedthehreycolouris due to the formationof

Answer»

`Hg_(2)CI_(2)`
`SnCI_(4)`
`Sn`
`HG`

Answer :d
Discussion
6720.

What are the concentration of H^+, H_2C_2O_4,HC_2O_(4)^(-) and C_2O_4^(2-) in a 0.1 M solution of oxalic acid ? [K_(1)=10^(-2)M and K_(2)=10^(-5)M]

Answer»


ANSWER :0.027M, 0.073M, 0.027M, `10^(-5)M`
Discussion
6721.

Which can act only as oxidising agent ?

Answer»

`O_3`
`O_2`
`CI_2`
`F_2`

ANSWER :D
Discussion
6722.

Which one of the following is the general electronic configuration of transition elements?

Answer»

`["Noble gas"] ns^(2) NP^(6)`
`["Noble gas"] (n-2) F^(1-14) (n-1) d^(1-10) ns^(2)`
`["Noble gas"] (n-1) d^( 1-10) (n-1) f^(1-14) ns^(2)`
`["Noble gas"] (n-1) d^( 1-10) ns^(2)`

SOLUTION :`["Noble gas"] (n-1) d^( 1-10) ns^(2)`
Discussion
6723.

What is the coordination entity formed when excess of liquid ammonia is added to an aqueous solution of copper sulphate?

Answer»

Solution :When excess of liquid ammonia is ADDED to an aqueous solution of copper sulphate to GIVE tetraamminecopper (II) sulphate
`underset(("Copper Sulphate"))(CuSO_(4)) + underset("(Ammonia)")(4NH_(3)) rarr underset(("TETRAMMINECOPPER (II) Sulphate"))([Cu(NH_(3))_(4)] SO_(4))`
Therefore, the coordination ENTITY is `[Cu(NH_(3))_(4)]^(2+)`
Discussion
6724.

Why C_(6)H_(5)N^(+)(CH_(3))_(3)OH ^(-) a stronger base than NH_(4)OH ?

Answer»

Solution :Due to -I EFFECT ofphenyl group, it decreases `E^(-)` DENSITY on NITROGEN atom but no such group in `NH_(4)OH`.
Discussion
6725.

Zn, Cd and Hg are only 'd' block elements but not transition elements because

Answer»

They have partly filled 'd'sub shells both in their ATOMIC and ionic STATES
They have COMPLETELY filled 'd' sub shells both in their atomic and ionic states
They have fully filled 'd' sub shells only in their atomic states
They have partly filled 'd' sub shells only in their atomic states

Answer :B
Discussion
6726.

Which of the following combination is correct for most stable carbocation ?

Answer»

<P>(I)(II)(R)
(I)(i)(P)
(IV)(i)(R)
(IV)(ii)(S)

SOLUTION :
Discussion
6727.

What is the name of the bidentate ligand 'dmg' ?

Answer»

SOLUTION :DIMETHYL glyoxime.
Discussion
6728.

Write the name of monomers used for getting the following polymers: (i) Terylene (ii) Nylon 6, 6

Answer»

SOLUTION :(i) ETHYLENE GLYCOL (Ethane-1, 2-diol) and terephthalic acid (Benzene-1, 4-dicarboxylic acid)
(ii) Hexamethylenediamine and ADIPIC acid.
Discussion
6729.

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

Answer»

Halogenation<BR>Hydrogenation
Chlorination
Dehydro-halogenation

Solution :`CH_3-undersetunderset(Br)(|)CH-CH_2-CH_3overset"alc.KOH"to UNDERSET"2-butene"(CH_3CH=CHCH_3)`
The REACTION is DEHYDROHALOGENATION
Discussion
6730.

Which type of forces bind together the carbon atoms in diamond ?

Answer»

COULOMBIC forces
Dipole-dipole forces
van DER WAALS' forces
Covalent forces

Answer :D
Discussion
6731.

Which is the product of the following reactions C_(6)H_(5)-overset(O)overset(||)C-OCH_(3)underset(2.H^(+)//H_(2)O)overset(1.C_(2)H_(5)MgBr(2 "mole"))to

Answer»

`C_(6)H_(5)-CH_(2)-OH`
`C_(6)H_(5)-UNDERSET(OH)underset(|)CH-C_(2)H_(5)`
`C_(6)H_(5)-underset(OH)underset(|)overset(C_(2)H_(5))overset(|)C-C_(2)H_(5)`
`C_(6)H_(5)-overset(O)overset(|)C-OC_(2)H_(5)`

SOLUTION :
Discussion
6732.

Which of the following statements is/are not true?

Answer»

COLLAGEN in tendons is a globular protein
Keratin protein present in hair has a-helix structure
Coagulation of ALBUMIN present in WHITE of an egg is an example of denaturation of protein.
The enzymes are not SPECIFIC in nature.

Answer :B::D
Discussion
6733.

Which of the following is involved in polymerisation?

Answer»

`(BeH_(2))_(n)`
`(BeCl_(2))_(n)`
Both
NONE of these

Answer :C
Discussion
6734.

Power alcohol is :

Answer»

SOLUTION :A mixture of absolute alcohol (20%). Petrol (80%) and some benzene as a COSOLVENT is CALLED power alcohol.
Discussion
6735.

To reduce 1 mol MnO_(4)^(-1) into Mn^(2+), how much coulomb electricity is required ?

Answer»

96500 C
`1.93xx10^(5)C`
`4.83xx10^(5)C`
`9.65xx10^(6)C`

Solution :`UNDERSET(+7)(MnO_(4)^(-))+5E^(-) to underset(+2)(Mn^(2+))=5xx96500=4.825xx10^(5)C`
Discussion
6736.

Which of the following structures is enantiomeric with the molecule (A) given below?

Answer»




SOLUTION :It is the CORRECT ANSWER. It is an example of finkelstein REACTION
Discussion
6737.

Which of the following is a mixed ketone

Answer»

3-Pentanone
ACETONE
Benzophenone
2-Butanone

SOLUTION :MIXED ketones are those that have two different alkyl GROUPS on them for example 2-butanone
Discussion
6738.

Which of the polymer is used in making fibres, safety belts, tyre cords and ropes?

Answer»

TERYLENE
orlon
Nylon
bakelite

Solution :terylene
Discussion
6739.

Which species is the strongest oxidising agent

Answer»

`CU^(2+)`
`ZN^(2+)`
`Br^(-)`
`PB^(2+)`

ANSWER :A
Discussion
6740.

X overset(H_(3)O^(o+))rarrY+Z Y and Z both participate in haloform reaction, which of the following can't be X?

Answer»


`CH_(3)-OVERSET(O)overset(||)C-overset(O)overset(||)C-O-overset(CH_(3))overset(|)C=CH_(2)`
Discussion
6741.

What is the role of : ( i) Depressants in froth floatation ? (b) Carbon monoxied in Mond's process ? ( c) Concentrated sodium hydroxide in leaching of alumina from bauxite ?

Answer»

SOLUTION :SEE Q.12 (III) ,Paper - 2015 ,Outside Delhi ,Set-i[Page 304]
( b) See Q.13 (i) Paper - 2012 ,Delhi Board ,Set-I [Page 140]
(c ) Bauxite `(Al_2O_3.2H_2O)` contains more amount of `Fe_2O_3` as imortant than `SiO_2`impurity .Now since iron oxide is basic and aluminium oxide is amphoteric,using NaOH DISSOLVE aluminium oxide has silicates ,but iron oxide remainunreacted and insoluble which can be easily separated by filtration .
Discussion
6742.

Which of the statements given below is/are correct ? Permanent hardness of water is due to the presence of soluble. 1. chloride of calcium 2. bicarbonate of calcium 3. sulphate of magnesium 4. bicarbonate of magnesium Select the correct answer using the codes give below

Answer»

1 only
1 and 3
2 and 4
1 , 2 and 3

Solution :CHLORIDES and sulphates of calcium and magnesium are responsible for permanent hardness of water .
Discussion
6743.

Which of the following will exhibit maximum ionic conductivity ?

Answer»

`K_(4)[Fe(CN)_(6)]`
`[Co(NH_(3))_(6)]Cl_(3)`
`[Cu(NH_(3))_(4)]Cl_(2)`
`[NI(CO)_(4)]`

SOLUTION :`K_(4)[Fe(CN)_(6)]` GIVES five ions.
Discussion
6744.

Zone refining is based on the principle that…………

Answer»

impurities of low boiling metals can be separated by distillation
impurities are more soluble in molten metal than in solid metal.
different components of a MIXTURE are DIFFERENTLY adsorbed on an adsorbent.
vapours of volatile COMPOUND can be DECOMPOSED in pure metal.

Answer :B
Discussion
6745.

The value of (RT)/(PV) fora gas at critical condition is how many times of (RT)/(PV) at normal condition?

Answer»

`(8)/(3)`
`(3)/(8)`
3
`(1)/(3)`

ANSWER :A
Discussion
6746.

Write the reactions involved in extraction of silver from its ore by leaching process. Derive the equation : W = -P_("ext"*DeltaV) A unit cell of iron crystal has edge length 288 pm and density7*86 "g"cm^(-3) .Find the number of atoms per unit cell and type of the crystal lattice . Given : Molar ,mass of iron = 56 g"mol"^(-1) avogadro's number N_(A) = 6*022 xx 10^(23)

Answer»

Solution :(a) STEP -1 : The METAL is leached with doilute solution of NaCN or KCN in the presence of air `(O_(2))` , so that a soluble complex of the metal is obtained .
,
STEP - 2 : From TBE soluable complex `[M(CN_(2))]^(-)` , the metal Ag is precipitated by more electropositive or active metals like Zn .

(b) Consider a certain amount of an IDEAL gas enclosed in an ideal cylinder fitted with ,massless , frictionless rigid movable piston at pressure P, occupying volume `V_(1)` at Temperature T .
As the gas expands , it pushes the piston upward through a distance d against sternal force F , pushing the surroundings .
The WORK done by the gas is,
`W = "Opposing force" xx "Distance"`
`W = -Fxxd`
-ve sign indicates the lowering of energy of the system during expansion .
If a is the - section area of the cylinder or piston , then ,
` W = -F/a xx d xx a`
Now the pressure is,
` P _("ex") = F/a`
While volume change is ,
` Delta V = d xxa`
` :. W = -P _("ex") xx Delta V`
If during the expansion , the volume changes from `V_(1) and V_(2)` then ,
` Delta V = V_(2) - V_(1)`
` :. W = -P _("ex")(V_(2)-V_(1))`
(c )GIVEN that :

` d = 7*86 g//cm^(3)`
` a = 288 ` ppm
or ` = 2*88 xx 10^(-8)` cm
` N_(A) = 6*022 xx10^(23) "mol"^(-1)`
Molar mass = 56 g/mol
` d = (ZxxM)/(a^(3) xxN_(A))`
` Z = (d xx a^(3) xx N_(A))/M`
` = (7*86 xx(2*88 xx10^(-8))^(3)xx6*022 xx10^(23))/56`
` = 2*01 ~~ 2`
Hence, the unit cell of crystal lattice is of bcc type.
Discussion
6747.

Which of the following chemicals can be added for sweetening of food itmes at cooking temperatureand does not provide calories ?

Answer»

Sucrose
Glucose
ASPARTAME
SUCROLOSE

Solution :Sucrolose does not DECOMPOSE while aspartame does at COOKING TEMPERATURE.
Discussion
6748.

Which metals directly do not react with O_2

Answer»

`AU`
`PT`
Both 1 & 2 4
He, Ne

Solution :Noble metal do not react with OXYGEN.
Discussion
6749.

Which of the following is not a chromophone?

Answer»

`NH_(2)`
`-NO`
`-NO_(2)`
`-N=N-`

SOLUTION :Chromophore is colour BEARING group
`NH_(2)`
Discussion
6750.

Which set of the following compound(s) give benzene on reaction with PhMgBr?

Answer»




`CH_(3)NH_(2),CH_(3)-CH_(2)-SH`

SOLUTION :
Discussion