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12151.

When concentration of the solution approaches zero, the molar conductivity is known as limiting molar conductivity.

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ANSWER :1
Discussion
12152.

Which of the following tests is not shown by Acetaldehyde : (Iodoform test, Lucas test, Benedict.s test, tollen.s Test).

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SOLUTION :LUCAS TEST
Discussion
12153.

Which of the following compound is metallic and ferromagnetic ?

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`TiO_2`
`CrO_2`
`VO_2`
`MnO_2`

ANSWER :B
Discussion
12154.

Which among the following does not give a silver mirror test with Tollen's reagent?

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Ethanal
Methanoic ACID
Acetone
Propanal

Answer :C
Discussion
12155.

Which of the following would exhibit geometrical as well as optical isomerism ?

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`[PT(EN)_(3)]^(4+)`
`[Co(NH_(3))_(3)Cl_(3)]`
`[PtCl_(6)]^(2-)`
`[Pt(gly)_(2)Cl_(2)]`

SOLUTION :`[M(AB)_(2)a_(2)]` form can exhibit both TYPES of isomerism.
Discussion
12156.

What would be the heat released when an aqueous solution containing 0.5 mol if HNO_(3) is mixed with 0.3 mol of OH^(-1) (enthalpy of neutralisation is -57.1 kJ)

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28.5 KJ
17.1 kJ
45.7 kJ
1.7 kJ

Solution :0.3 mole `OH^(-)`, NEUTRALIZE 0.3 mole of `HNO_(3)`
Evolved HEAT, `=57.1xx0.3=17.13 kJ`.
Discussion
12157.

What products would be formed when a nucleotide from DNA containing thymine is hydrolysed ?

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Solution :On complete hydrolysis, the FOLLOWING products are obtained:
(i) 2-deoxy-D-(-) ribose SUGAR
(ii) Two pyrimidine bases : GUANINE (G) and Adenine (A).
(III) Two purine bases : Cytosine (C) and Thymine (T)
(iv) Phosphoric ACID.
Discussion
12158.

Which of the following cell is working acidic medium ? (i) Dry cell (ii) Mercury cell (iii) Lead Storage cell (iv) Ni-cd cell

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(i), (II), (IV)
(i), (ii), (III)
(i), (iii)
Only (i)

ANSWER :C
Discussion
12159.

What is a semiconductor ? Describe two main types of semiconductors and explain mechanism for their conduction.

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Solution :Solids which have intermediate conductivities between those of conductors and insulators are called semiconductors. The range of conductivity for such solids is `10^(-6)` to `10^(4) ("ohm m")^(-1)`. The atomic orbitals of the semiconductor atoms form molecular orbitals which are too ciose to each other so as to form band. In the case of semiconductors, the gap between the valence band and conduction band is small. Some of the elections JUMP from valence band to conduction band and some conductivity is observed.
N-type semiconductor : When a silicon crystal is doped with group 15 element such as P or As, the dopant atom with 5 valence electrons occupies the site normally occupied by silicon atom. Four electrons of dopant form four covalent bonds with Si and the fifth electron is free to take part in conduction of electricity. This type of semiconductor is called n-type semiconductor. n stands for negative. Thus n-type semiconductor is one in which the conductance takes place through movement of electrons.
p-type semiconductor : When a silicon is doped with group 13 element like B, Al or Ga (having three valence electrons), one of the positions held by Si is taken up by the dopant (B, Al or Ga). The dopant in this case is short of one electron to form 4 bonds with Si. Thus, a positive charge is created. In an ELECTRIC FIELD, this positive charge (hole) moves through the solid and CONDUCTS electricity. This is called p-type semiconductor. p-represents positive charge. The semiconductors in which the conduction take place through positive holes are called p-type semiconductors.
Discussion
12160.

When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains

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Sulphides of COPPER (II) and IRON (II)
Sulphides of copper (II) and iron (III)
Sulphides of copper (I) and iron (II)
Sulphides of copper (I) and iron (III)

SOLUTION :Copper matte is `Cu_2S + FeS`.
Discussion
12161.

The root mean square soeed of hydrogen molecules at room temperature is 2400 ms^(-1) . At room temperature theroot mean square speed of oxygen molecules would be :

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400 m `s^(-1)`
`300 m s^(-1)`
`600 m s^(-1)`
`1600 m s^(-1)`

ANSWER :C
Discussion
12162.

Which of the following does not undergo disproportionation in the presence of

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`CH_(3)CHO`
`HCHO`
`C_(6)H_(5)CHO`
Chloral

Answer :A
Discussion
12163.

Which one of the following are prepared by electrolytic method ?

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MG
Sn
S
`F_2`

SOLUTION :`Mg and F_2` are PREPARED by ELECTROLYTIC METHODS.
Discussion
12164.

What is meant by coagulation of a colloidal solution ? Name any method by which coagulation of lyophobic sols can be carried out.

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Discussion
12165.

When copper is heated with conc. HNO_(3) , it produces-

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`CU(NO_(3))_(2)` and `NO_(2)`
`Cu(NO_(3))_(2)` and NO
`Cu(NO_(3))_(2)`, NO and `NO_(2)`
`Cu(NO_(3))_(2)` and `N_(2)O`

ANSWER :A
Discussion
12166.

Which of the following gas is coloured?

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`Cl_2`
`HCl`
`NH_(3)`
`SO_(2)`

Solution :`Cl_2` gasis greenish YELLOW
Discussion
12167.

Tumbull's andprussiant'sbluerespectively are KFe^(II)[Fe^(III)(CN)_(6)] andKFe^(II)(Fe^(11)(CN)_(6)]

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Solution :TURNBULL's bluecolour is oatained where `Fe^(2+)` salt REACTS with `K_(3)[(Fe^(III)CN)_(6)]` and prassion'sbluecolour is obtained when `Fe^(2+)` saltswith `K_(4)[(Fe^(II)CN)_(6)]`
`Fe^(II)CI_(2) + K_(3)[Fe^(III)Fe(CN_(6))] underset("turnball's blue")(KFe^(III)(CN)_(6)] + 2KCI`
`Fe^(III)CI_(3) + K_(4)[Fe^(II)(CN_(6))] rarr underset("prassion's blue")(KFe^(III)Fe(CN)_(6)] + 3KCI`
Hence true.
Discussion
12168.

Which of the following products are not correctly matched in the given raction ?

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`C_2H_2OCH_3+ HBR overset(373 k )rarrC_2H_5OH+CH_3Br`
`C_2H_5OC_2H_5 + @HI rarr C_2H_5OH+ CH_3 Br `
`C_2H_5OC_2H_5 +HCloverset("Cold")rarr [(C_2H_5)_2O^+H]CL^-`
`(CH_3)_3COC_2H_5 overset(HI)rarr (CH_3)_3CI+C_2H_5OH`

Solution :`underset((excess))(C_(2)H_(5)-O-C_(2)H_(5)+2HIrarr2C_(2)H_(5)I+H_(2)O)`
Discussion
12169.

Write the structures of the following compounds :1,4 -Dibromobut-2-ene

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SOLUTION :1,4 -Dibromobut-2-ene :<BR>`Br overset(1)(C )H_(2)-overset(2)(C )H=overset(3)(C )H-overset(4)(C )H_(2)Br`
Discussion
12170.

Two molecules of acetic acid are heated with P_(2)O_(5) . The product formed is

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TWO MOLES of ETHANOL
two moles of METHYL cyanide
acetic anhydride
FORMIC acid

Answer :C
Discussion
12171.

Which of the following is not a shortcoming of VBT ? (P) Quantitative interpretation of magnetic data (Q) Colour exhibited by coordination compounds (R ) Quantitative interpretation of the thermodynamic of kinetic stabilities of co-ordination compounds (S) Exact predictions regarding the octahedral structures of 6 co-ordination complexes (U) It does not distinguish between weak and strong ligands.

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<P>P, Q, R, U
T
S, T
Q, R and S

Solution :(T) `to` VBT does not make EXACT predictions REGARDING the tetrahedral and square planar STRUCTURES of 4 co-ordinate complexes.
Discussion
12172.

Which ofthe following compounds is the weakest Bronsted base?

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Solution :AMONG the given COMPOUNDS, phenol is the strongest ACID and thus is the weakest Bronsted BASE.
Discussion
12173.

Which of the following compounds can exist in optically active form ?

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1-butanol
2-butanol
3-pentanol
4-heptanol

Answer :B
Discussion
12174.

Which of the following cations precipitates as their chlorides?

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`Pb^(2)`
`Ag^(+)`
`Hg_(2)^(+2)`
`CD^(+2)`

SOLUTION :`Pb^(+2), Ag^(+), HG^(+2)` cations ppt as their chlorides.
Discussion
12175.

What is the general molecular formula of the products obtained on heating lanthanoids (Ln) with sulphur?

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LnS
`LnS_(3)`
`Ln_(3)S_(2)`
`LN(2)S_(3)`

Solution :Lanthanides HEATED with Sulphur gives products with general FORMULA `Ln_(2)S_(3)`
Discussion
12176.

Which among the following statements is false?

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A) The adsorption may be monolayered or multilayered
B) Particle size of adsorbent will not afect the AMOUNT of adsorption
C) Increase of pressure increases amount of adsorption
D) Increase of temperature may decrese the amount of adsorption.

Solution :The MAGNITUDE of adsorption depends on
(i) the nature of the adsorbent and its state of subdivision.
(II) the nature of the ADSORBATE and its concentration.
(iii) the temperature.
Discussion
12177.

Which one of the following is not used as a filler in laundary soaps?

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Sodium SILICATE
GLYCEROL
Sodium rosinate
Borax

ANSWER :B
Discussion
12178.

What carbon atom of deoxy ribose sugar in DNA does NOT contain -overset(|)underset(|)C - OH bond?

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`C_(5)`
`C_(3)`
`C_(2)`
`C_(1)`

Solution :`C_(2) to` Removal OXYGEN from C-2.
Discussion
12179.

Which of the following will be produced when C_2H_2 reacts with excess of HCl?

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`CH_2 = CHCL`
`CH_3CHCl_2`
CLCH = CHCl
None of these

Answer :B
Discussion
12180.

XCl_(2)("excess")+Ycl_(2) to XCl_(4)+Y darr , YO underset(gt400^(@))overset(Delta)to (1)/(2)O_(2)+Y, Ore of Y would be :

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Siderite
Cinnabar
Malachite
Hornsilver

Answer :B
Discussion
12181.

The second law of thermodynamics says that in a cyclic process

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WORK cannot be converted into heat
heat cannot be converted into work
work cannot be completely converted into heat
heat cannot be completely converted into work

Solution :According to second LAW, work can always be completely converted into heat but heat cannot be completely converted into work
Discussion
12182.

When ethyl alcohol (C_(2)H_(5)OH) is mixed with ammonia and passed over heated alumina, the compound formed is

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`C_(2)H_(5)NH_(2)`
`C_(2)H_(4)`
`C_(2)H_(5)OC_(2)H_(5)`
`CH_(3)OCH_(3)`

Solution :`C_(2)H_(5)OH + NH_(3) OVERSET(Al_(2)O_(3))to C_(2)H_(5)NH_(2) + H_(2)O`
Discussion
12183.

The salts of which alkaline earth metal are used in the form of manure

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MG
CA
Ba
Sr

ANSWER :B
Discussion
12184.

Unit cell can be broadly classified into 2 categories-primitive and centred unit cells. Name the three types of centred unit cells.

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Solution :BODY CENTRED unit CELL (BCC), face centred unit cell (fcc), end centred unit cell.
Discussion
12185.

Which among the following true regarding adsorption? (i) Adsorption is a spontaneous process (ii) Adsorption is always accompanied by increase in free energy. (iii) Adsorption is an endothermic process (iv) Adsorption can occur in all interfacial surfaces.

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only (II)
(ii) and (III)
only (i)
(i) and (IV)

ANSWER :D
Discussion
12186.

When is the value of van't Hoff factor more than one?

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Solution :`IGT 1` when the SOLUTE undergoes DISSOCIATION in the solution.
Discussion
12187.

Zero group elements are inert due to_______.

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SOLUTION :STABLE full-filled or CLOSED SHELL electronic-configuration
Discussion
12188.

Which of the following make up an isotonic traid?

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`""_(32)^(78)Ge,""_(33)^(77)As,""_(31)^(74)GA`
`""_(18)^(40)AR,""_(19)^(40)K,""_(20)^(40)Ca`
`""_(92)^(233)U,""_(90)^(232)Th,""_(94)^(239)Pu`
`""_(6)^(14)C,""_(8)^(16)O,""_(7)^(15)N`

Solution :All contain 8 neutrons.
Discussion
12189.

Which one of the following is an example of general anaesthetic?

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PROPOFOL
ISOFLURANE
ranitidine
omeprazole

Solution : isoflurane
Discussion
12190.

Trans-diglycinatoplatinum (II) has a shape

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trigonal
tetrahedral
square planar
octahderal

Answer :C
Discussion
12191.

Which of the following are used as chain transfer agents?

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`CCl_(4)`
`CBr_(4)`
BENZOQUINONE
BENZOYL peroxide

Answer :A::B
Discussion
12192.

What mass (in mg) of available O_(2) per liter is present in the a solution of H_(2)O_(2) 10 mL of which when treated requires 25 mL of N/20 KMnO_(4) for complete oxidation of it

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Solution :The given REACTION is
`2KMnO_(4) + 5H_(2)O_(2) + 4H_(2)SO_(4) to 2KHSO_(4) + 2MnSO_(4) + 8H_(2)O + 5O_(2)`
meq. Of `O_(2)` =MEG . Of `H_(2)O_(2) =` meq. Of `KMnO_(4)`
`Nxx10=25xx1/20`
`:. N_(H_(2)O_(2)) =25/200 =0.125 rArr N_(O_(2))=0.125`
or `W_(O_(2))=0.125xx16 =2g//L`
Discussion
12193.

The reducing agent added in the extraction of Iron from oxide one of iron is

Answer»

coke
Aluminium
CARBON MONOXIDE
ZINC

ANSWER :A
Discussion
12194.

Which one of the following is formed when acetone is treated with magnesium amalgam and water?

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PINACOL
Acetyl acetone
Aceto ACETIC ester
1,2 – DIMETHYL BUTANE 1,2 - diol

Solution :Pinacol
Discussion
12195.

Which of the following alcohol gives the best yield of dialky ether on being heated with a trace of sulphuric acid ?

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Pentan-2-ol
Cyclopentanol
2-Methyl butan-2-ol
Pentan-1-ol

Solution :PRIMARY alcohol (penton-1-ol) READILY forms ETHERS when HEATED with conc. `H_(2)SO_(4)` and gives best yield.
Discussion
12196.

Write the chemical reactions of CH_(3)COCH_(3) with the following: (i) NH_(2)-OH (ii) HCN (iii) R - MgX (iv) NaHSO_(3) (v) Zn-Hg // HCl

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SOLUTION :
Discussion
12197.

Zieglar natta catalyst is :-

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`R_3Al`
`TiCl_4`
`R_3Al + TiCl_4`
`R_3B + TiCl_2`

ANSWER :C
Discussion
12198.

Which of the following sequence represents atomic number of only representative elements?

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55,12,48,53
13,33,54,83
3,33,53,87
22,33,55,66

Answer :C
Discussion
12199.

Which of the following pentafluorides cannot be prepared?

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`PF_5`
`AsF_5`
`SbF_5`
`BiF_5`

ANSWER :D
Discussion
12200.

When AgCl is treated with KCN

Answer»

AG is precipitated
a compled ION is fomred
double decomposition takes place
no reaction takes place.

Solution :`AgCl+2KCNtoK[Ag(CN)_(2)]+KCL`
Discussion