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19251.

The statement that is NOT correct is

Answer»

a furnace lined with Haematite is used to convert CAST iron to wrought iron.
COLLECTORS enhance the wettability of mineral particles during froth FLOATATION
in vapour PHASE refining , metal should FORM a volatile compound.
copper from its low grade ores is extracted by hydrometallurgy.

Solution :Collectors are added to enhance the non - wettability of mineral particles during froth floatation.
Discussion
19252.

Which of the following statements is NOT TRUE about crystal field theory (CFT) ?

Answer»

Does not explain `pi`-bonding in COMPLEXES.
Explains Kinetic and THERMODYNAMIC properties of some complexes.
Explains COLOURS exhibited by complexes DUE to d-d transitions.
Explains only about the central metal ION with s ad p- orbitals

Answer :D
Discussion
19253.

Whattypeof linkageshold togethermonomersof DNA ?

Answer»

SOLUTION :Phospho diester linkagehold togethermonomers of DNA .
Phosphric ACID formphosphodiester bond betweenneucleotides .
The sugar- PHOSPHATE linkageforms the BACKBONE of eachstrandof DNA .
Discussion
19254.

Which of the following is present at the time of cracking of hydrocarbons?

Answer»

COPPER
Zeolite
Nickel
Molybdenum

Solution :Catalyst changes the ACTIVATION ENERGY `(E_(a))` .
Discussion
19255.

Which of the following represents the given mode of hybridisation sp^2-sp^2-sp-sp from left to right

Answer»

`H_2C=CH-C-=CH`
`HC-=C-C-=CH`
`H_2C=C=C=CH_2`

SOLUTION :`OVERSET(SP^2)CH_2=overset(sp^2)CH-overset(sp)C-=overset(sp)CH`
Discussion
19256.

The volume of water to be added to 100cm^(3) of 0.5 N H_(2)SO_(4) to get decinormal concentration is

Answer»

`100CM^(3)`
`450CM^(3)`
`500cm^(3)`
`400cm^(3)`

SOLUTION :`N_(1)V_(1)=N_(2)V_(2)", i.e., "0.5xx100=0.1xxV_(2)or V_(2)=500cm^(3)`
`therefore" Water to be added to "100cm^(3)" solution"=500-100=400cm^(3).`
Discussion
19257.

Which of the following is true about the polymer -(CH_2-CH(C_6H_5)_n-) ?

Answer»

It is a homopolymer and CONDENSATION POLYMER
It is a COPOLYMER and condensation polymer
It is a homopolymer and ADDITION polymer
It is a copolymer and condensation polymer .

Answer :C
Discussion
19258.

Which one of the following is an example of non-ionic detergent?

Answer»

SODIUM lauryl SULPHATE
n-HEXA decyl trimethyl ammonium chloride
PENTA erythrityl stearate
N,N,N-trimethyl hexa decan-1- aminium chloride

Solution :Penta erythrityl stearate
Discussion
19259.

Which of the following is second ion is more stable than the first

Answer»

`underset("I")(CH_(2)=Coverset(Theta)H) and underset("II")(CH=overset(theta)C)`
`underset("I")(C_(6)H_(5)-Coverset(Theta)H_(2)) and underset("II")(CH_(2)=CH-Coverset(Theta)H_(2))`
`CH_(3)-Coverset(Theta)H-CH=CH_(2) and Coverset(Theta)H_(2)-CH=CH_(2)`

ANSWER :A
Discussion
19260.

What is meant by Hydroboration - oxidation reaction? Illustrate it with an example. (b) Predict the major product of acid catalysed dehydration of 1 - methylcyclohexanol.

Answer»

Solution :Hydroboration - oxidation reaction
This reaction INVOLVES the addition of DIBORANE to an alkene followed by oxidation with alkaline `H_(2)O_(2)`
`6CH_(3)-CH=CH_(2)+B_(2)H_(6)overset("THF")RARR 2(CH_(3)CH_(2)CH_(@))_(3)B`
`(CH_(3)CH_(2)CH_(2))_(3)B+3H_(2)Ooverset(OH^(-),H_(2)O)rarr underset("Propan -1- ol")(3CH_(2)CH_(2)CH_(2))-OH+H_(3)BO_(3)`
The alcohol obtained is due to anti - Markownikov.s addition of water to alkene.
, 1 - Methylcyclohexene is the major product.
Discussion
19261.

x,y and z are respectively

Answer»

`1,2,3`
`1,5,3`
`1,3,5`
`5,3,1`

SOLUTION :`N` FACTOR of `KMnO_(4)`
Discussion
19262.

Which is the coordination number of each atom in a simple cubic unit cell ?

Answer»

8
6
12
4

Answer :B
Discussion
19263.

What is the nature of photochemcial smog ?

Answer»

SOLUTION :It is OXIDIZING in NATURE.
Discussion
19264.

Whe a radioactive substance is kept in vacuum, the rate of its disintegration per second

Answer»

Increases considerably
Is not affected
Suffers a slight decrease
Increases only if the products are gaseous

Solution :As there is no physical CHANGE INVOLVED in case of RADIOACTIVE disintegration, so it will not be affected by external changes
Discussion
19265.

The species which can act both as Bronsted acid and base is

Answer»

`CO_3^2-`
`NO_3^-`
`HSO_4^-`
`SO_4^2-`

ANSWER :C
Discussion
19266.

Which method is used to remove silver impurities from lead?

Answer»

LEACHING with DILUTE `NACN `solution
Parke's process
Leaching with dilute `NaCN` in presence of AIR
Electrolytic PURIFICATION using `AgNO_3`

Answer :B
Discussion
19267.

The standard oxidation potentials, E^@ for the half reactions are : ZnrarrZn^(2+) +2e ,E^@=+0.76VAg rarr Ag^+ +e,E^@=-0.77V The standard emf of the cell, Ag^+ +Zn rarrZn^(2+)+Ag is :

Answer»

`+1.53`
`-1.53`
`+0.01`
`+0.01`

ANSWER :A
Discussion
19268.

What happens when vapoursisopropyl alcohol are passed over heated copper?

Answer»

Acetone
Ethyl alcohol
Methyl alcohol
Acetaldehyde

Answer :A
Discussion
19269.

What is symbolic representaiton of given following reaction. Fe_((S)) + Cd_((aq))^(2+) hArr Fe_((aq))^(2+)+Cd_((S))

Answer»

`""^(Theta)Fe_((S))|Fe_((1M))^(2+)||Cd_((S))|Cd_((1M))^(2+)o+`
`""^(Theta)Cd_((S))|Cd_((1M))^(2+)||Fe_((1M))^(2+)|Fe_((S))o+`
`""^(Theta)Cd_((S))|Cd_((1M))^(2+)||Fe_((S))|Fe_((1M))^(2+)o+`
`""^(Theta)Fe_((S))|Fe^(2+)(1M)||Cd_((1M))^(2+)|Cd_((S))o+`

Solution :`""^(Theta)Fe_((S))|Fe^(2+)(1M)||Cd_((1M))^(2+)|Cd_((S))o+`
`Fe_((S)) to Fe_((AQ))^(2+)+2e^(-)`Oxidation (Anode)
`Cd_((aq))^(2+)+2e^(-) to Cd_((S))`REDUCTION (Cathode)
`therefore ""^(Theta)Fe_((S))|Fe_((1M))^(2+)||Cd_((1M))^(2+)|Cd_((S))o+`
Discussion
19270.

Why a mixture of carbon disulphide and acetone shows positive deviation from Raoult's law ? What type of azeotrope is formed in this mixture ?

Answer»

SOLUTION :A mixture of carbon disulphide and acetone SHOWS positive DEVIATION. This is becauseintermolecular FORCES of ATTRACTION between carbon disulphide and acetone are weaker than between pure components. A minimum boiling azeotrope is formed at a specific composition.
Discussion
19271.

The sex hormone which controls the development and maintenance of pregnancyis

Answer»

Cortisone
THYROXINE
Progesterone
ESTRONE

ANSWER :C
Discussion
19272.

When equal voluines of the following solutions are mixed, precipitation of AgCl (K = 1.8 xx 10-^(10)) will occur only with

Answer»

`10^(-4) M Ag^(+)and 10^(-4)M CI^(-)`
`10^(-5) M Ag^( +) and 10^(-5) MCI^(-)`
`10^(-6) M Ag^(+) And10^(-6)MCI^(-)`
`10^(-10)M Ag^(+) and10^(-10) M CI^(-)`

Solution :Aftermixing`[Ag^+] [CI^-] gt K_(SP) ` onlyfor(a)
Discussion
19273.

Which of the following processes can be used to prepare polystyrene?

Answer»

Anionic
Cationic
Free radicals
Zigler-Natta

Answer :A::B::C::D
Discussion
19274.

Which of the following is known as "Stranger" gas ?

Answer»

XE
`Cl_2`
`O_(3)`
`SO_(2)`

ANSWER :A
Discussion
19275.

Which of the following is a gas at room temperature ?

Answer»

`CH_(3)CHO`
`HCHO `
`CH_(3)COCH_(3)`
`C_(2)H_(5)OC_(2)H_(5)`

Answer :B
Discussion
19276.

What is the significance of lattice point ?

Answer»

Solution :Lattice point in a space lattice REPRESENTS the CONSTITUENT particle i.e., ATOM, ion or MOLECULE.
Discussion
19277.

What is the radius ratio range(r^+//r^-)for ionic solids with bcc structure?

Answer»

SOLUTION :0.732 to 1.0.
Discussion
19278.

Which of the following has the smallest size ?

Answer»

`NA^+`
`MG^(2+)`
`Al^(3+)`

Answer :C
Discussion
19279.

Which of the following plots represent the behaviour of an ideal binary liquid solutions?

Answer»

<P>Plot of`P_("total")vsY_(A)`(MOL FRACTION of`A`in vapour phase)
Plot of`P_("total")vsY_(B)`is linear
Plot of`(1)/(P_("total"))vsY_(A)`is linear
Plot of`(1)/(P_("total"))vsY_(B)`is non- linear

Solution :`Y_(A)=(P_(A)^(@).X_(A))/(P_("total"))`
Graph of `YA Vs (1)/(P_("total"))` is linear
Discussion
19280.

Which types of isomerism is shown by 2,3-dichlorobutane

Answer»

Distereo
Optical
Geometric
Structural

Solution :
Discussion
19281.

Write the IUPAC name for one of the isomers of [Co(NH_(3))_(5)NO_(2)] ^(2+).

Answer»

SOLUTION :The linkage ISOMER is `[CO(NH_(3))_(5)ONO]^(2+)`. Its name is pentaamminenitrito-O-cobalt(III) ion.
Discussion
19282.

When a metal sulphate is heated in dry test tube, the colour changes from blue to white. Then metal sulphate may be :

Answer»

`BaSO_(4)`
`CuSO_(4).5H_(2)O`
`Na_(2)SO_(4)`
NONE of these

Answer :B
Discussion
19283.

The statement ''If 0.003 moles of a gas are dissolved in 900 g of water under a pressure of 1 atmosphere, 0.006 moles will be dissolved under a pressure of 2 atmospheres'', illustrates

Answer»

DALTON's LAW of Partial Pressures
Graham's law
RAOULT's law
HENRY's law

Answer :D
Discussion
19284.

Why are benzenediazonium salts soluble in water?

Answer»

SOLUTION :Being IONIC they are SOLUBLE in WATER.
Discussion
19285.

The solar cell is an efficient ______________ used for the conversion of light energy into electrical energy.

Answer»

SOLUTION :PHOTODIODE
Discussion
19286.

The standard molar heat of formation ethane, CO_(2) and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustion of ethane will be

Answer»

`-372 kcal`
162 kcal
`240` kcal
183.5 kcal

Solution :Given,
(i) `2C+3H_(2)toC_(2)H_(6),DeltaH=-21.1` kcal
(II) `C+O_(2) to CO_(2),DeltaH=-94.1kcal`
(iii) `H_(2)+(1)/(2)O_(2) to H_(2)O,DeltaH=-68.3kcal`
MULTIPLYING Eq. (ii) by 2 and eq. (ii) by 3 then follow, 2(ii)+3
(iii)-(i)
`C_(2)H_(6)+(3)/(2)O_(2) to 2CO_(2)+3H_(2)O`
`Deltax=2(-94.1)+3(-68.3)-(-21.1)`
`=372` kcal
Discussion
19287.

Which of the following has highest heat of combustion ?

Answer»




ANSWER :C
Discussion
19288.

Which of the following contains P-O-P bond ?

Answer»

Hypophosphorus ACID
Pyrophosphoric acid
Phosphorus acid
Orthophosphoric acid

Solution :Pyrophosphoric acid
Discussion
19289.

Whichone of the following compounds is most reactive towards electrophilic nitration reaction-

Answer»

toluene
benzene
benzoic acid
nitrobenzene

Solution :Due to `+I` and hyperconjugative effect of `-CH_(3)` group, toluene is the most REACTIVE TOWARDS electrophilic nitration reaction.
Discussion
19290.

Which ion gives coloured solution ?

Answer»

`ZN^(2+)`
`Ti^(4+)`
Cu
`V^(3+)`

SOLUTION :`V^(3+)` has `3D^(2)` CONFIGURATION and therefore, it is coloured.
Discussion
19291.

Which of the following plot represents the graph of pH against volume of alkali added in the titration of NaOH and HCl

Answer»




ANSWER :C
Discussion
19292.

Which is formed with lithium is heated in air?

Answer»

Only `Li_2O`
Only `Li_3N`
Both `Li_2O and Li_3N`
Both `Li_2O_2 and Li_3N`

ANSWER :C
Discussion
19293.

Write the complete set of reactions occurring in the zone of reduction in the blast furnace in the metallurgy of iron.

Answer»

Solution :In ELLINGHAM diagram, the graph of `CO rarr CO_(2)` CONVERSION remains below `Fe rarr Fe_(2)O_(3)` upto 1073 K
(for `Fe rarr FeO`). SO , CO(g) act is reducing agent upto this temperature.
`3Fe_(2)O_(3) + CO rarr 2Fe_(3)O_(4)` (IE. `FeO.Fe_(2)O_(3)) + CO_(2)`
`Fe_(3)O_(4) + CO rarr 3FeO + CO_(2)`
`FeO + CO rarr Fe + CO_(2)`
Also, graph of `C rarr CO` is below the graph of `Fe rarr Fe_(2)O_(3)` after 1123 K. So, carbon ACTS as reducing agent above this temperature.
`Fe_(2)O_(3) + C rarr 3CO + 2Fe`.
Discussion
19294.

Tin plague is the :

Answer»

CONVERSION of stannous to stannic
Conversion of WHITE TIN to GREY tin
Emission of sound while bending a tin rod
ATMOSPHERIC oxidation of tin

Answer :B
Discussion
19295.

Which does not react with Fehling's solution ?

Answer»

ACETALDEHYDE
Benzaldehyde
GLUCOSE
FORMIC acid

Answer :B
Discussion
19296.

Which of the following statements is not characteristic of free radical chain reaction

Answer»

It gives MAJOR product derived from most stable free radical
It is usually sensitive to change in solvent polarity
It proceeds in three MAIN steps like INITIATION, propagation and termination
It may be initiated by U.V. light

SOLUTION :This option is not characteristics of free radical chain reaction.
Discussion
19297.

The vapour density of the compound C_2H_5OH is:

Answer»

23
46
64
32

Answer :A
Discussion
19298.

Which one of the following is the smallest In size ?

Answer»

`N^(3+)`
`O^(2+)`
`F^-`
`NA^+`

Answer :D
Discussion
19299.

Which amongst the following are organometalic componds :- (i) Al_(2)(CH_(3))_(6) (ii) K[PtCl_(3)(C_(2)H_(2))] (iii) N(CH_(3))_(3)

Answer»

i only
iii only
i, II, and iii
i and ii only

Answer :D
Discussion
19300.

Which of the following reactions is quite violent in nature ?

Answer»

Between HYDROGEN and FLUORINE
Between hydrogen and CHLORINE
Between hydrogen and BROMINE
Between hydrogen and iodine

Answer :A
Discussion