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17301.

When molten suphur is quenched, the following is formed.

Answer»

Monoclinic sulphur
RHOMBIC sulphur
Crystex (PLASTIC
`gamma` - sulphur

SOLUTION :Molten sulphur gives plastic sulphur when POURED into WATER
Discussion
17302.

To synthesize the unsymmetrical alkyne CH_3-C-=C-CH_2-CH_3 the reagents needed would be

Answer»

Ethene, iodoethane, IODOMETHANE and potassium hydroxide
Acetaldehyde , 1-bromopropane and conc. `H_2SO_4`
1,2-dichloroethane , 1-propanol and ALCOHOLIC potassium hydroxide
Ethyne, iodomethane , iodoethane and sodamide

Solution :`CH-=Choverset(NaNH_2)to CH-=C^(-)NA^(+) UNDERSET"-NAI"overset(CH_3I)to CH-=C-CH_3`
`underset"Pent-2-yne"(C_2H_5-C-=C-CH_3)underset"-NaI"overset(C_2H_5I)larr Na^(+)C^(-) -=C-CH_3`
Discussion
17303.

What is called crystal lattice ?

Answer»

Solution :The ARRANGEMENT depicted in the form of a 3D array of POINTS is CALLED CRYSTAL lattice.
Discussion
17304.

Write the products obtained when propynide ion (CH_3C-=overset(Theta)C":") is allowed to react with - hexane. Also mention, where no reaction occurs.

Answer»

SOLUTION :No REACTION,
[Propyne is a weaker acid than `H_2O and CH_3OH` but it is a stronger acid than , `NH_3` 1-HEXANE and hexane.]
Discussion
17305.

Which of the following exhibit maximum oxdiation state of vanadium

Answer»

`VoCl_(3)`
`VCl_(4)`
`VCl_(3)`
`VCl_(2)`

ANSWER :A
Discussion
17306.

What is the boiling point of an azeotrope of non-ideal solution showing positive deviations as compared to the boiling points of its components ?

Answer»

Solution :The boiling point of such an azeotrope is LOWER than that of its COMPONENTS.
Discussion
17307.

Which one of the following is the product formed when acetamide is treated with P_2 O_5?

Answer»

ACETONITRILE
METHYLAMINE
ETHYL cyanide
Methanamine

SOLUTION :Acetonitrile
Discussion
17308.

Which of the following substance are green ?

Answer»

`Fe(BO_(2))_(3)`
`Cu`
`CR(BO_(2))_(3)`
`CO(BO_(2))_(2)`

ANSWER :a,c
Discussion
17309.

Which compound shows highest oxidation number for chlorine

Answer»

`KClO_4`
`KCLO`
`KClO_3`
`HCL`

ANSWER :A
Discussion
17310.

Write two difference between multimolecular colloids and macromoldcular colloids.

Answer»

Solution :(i) MULTIMOLECULAR colloids are formed by aggregation of small molecules (DIAMETER `LT1` nm) while macromolecular colloids are formed by macromolecules (polymers) and consist of SINGLE molecules.
(ii) Multimolecular colloids are generally lyophobic whereas macromolecular colloids are generally lyophilic.
Discussion
17311.

Write the difference between : (a) catalysts and enzymes

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SOLUTION :(a) Catalyst is a SUBSTANCE that alters the RATE of reaction without consuming itself in the reaction . Ezymes are biocatalysts, they are highly specific than catalysts.
Discussion
17312.

Whichof the following has a offensive odour?

Answer»

Phenol
BENZYL ALCOHOL
Acrolein
Benzyl BENZOATE

Answer :C
Discussion
17313.

The reduction of zinc oxide with coke occurs at temperature

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GREATER than that for for CuO
less than that for CuO
less than that for `Ag_2O`
EQUAL to that for CuO

Answer :A
Discussion
17314.

Write the structural formula of PCl_5(s).

Answer»

Solution :In the solid state `PCl_5` EXISTS as `[PCl_4]^+ [PCl_6]^-` in which the CATION `[PCl_4]^(+)` is TETRAHEDRAL while the anion `[PCl_6]^-` is OCTAHEDRAL.
Discussion
17315.

Which of the following C-H bond has the lowest bond dissociation energy

Answer»

Primary `(1^(@))C-H` BOND
Secondary `(2^(@))C-H` bond
Tertiary `(3^(@)) C-H` bond
All of these

Answer :C
Discussion
17316.

What is coordination entity? Give example.

Answer»

Solution :COORDINATION entity is an ion or a neutral MOLECULE composed of a central action, usually a metal and the ARRAY of other groups of ATOMS (ligands) that are attached to it.
For e.g, in potassium FERROCYANIDE `K_(4)[Fe(CN)_(6)]` the coordination entity is `[Fe(CN)_(6)]^(4-)`
Discussion
17317.

Which of the followingis not a colloid ?

Answer»

Foam
Cloud
Rooh Afza syrup
Egg

ANSWER :C
Discussion
17318.

When lead storage battery is charged ………………. .

Answer»

`PbO_(2)` is DISSOLVED
`H_(2)SO_(4)` is REGENERATED
`PbSO_(4)` is deposited on lead electrode
Lead is deposited on lead electrode

Solution :`PbSO_(4)` is deposited on lead electrode
Discussion
17319.

Which of the following pollutants is main product of automobile exhaust ?

Answer»

CO
`CO_2`
NO
Hydrocarbons

Answer :C
Discussion
17320.

Zeolite which shows ion-exchanging ability :

Answer»

Is an ION -exchange resin
Is a close - PACKED assembly of silicon and oxygen atoms
Is a sodium ALUMINOSILICATE
Can provide `H^+` IONS in place of `Na^+` ions

Answer :C
Discussion
17321.

Which of the following alkyl halides is hydrolysed by S_N^1 mechanism ?

Answer»

`CH_3-BR`
`CH_3CH_2-Br`
`CH_3CH_2CH_2-Br`
`(CH_3)_3C -Br`

ANSWER :D
Discussion
17322.

When 965 amp current is passed through aqueous solution of salt X using platinum electrodes for 10 sec, the volume of gasses liberated at the respective electrodes is in 1:1 ratio. Then X is

Answer»

`MgSO_4`
AGCL
`MgCl_2`
`KNO_3`

ANSWER :C
Discussion
17323.

What is effective atomic number ? Calculate effective atomic number of copper (Z = 29) in [C(NH_(3))_(4)]^(2+)

Answer»

SOLUTION :Effective atomic number : It is total number of electrons around the central METAL ion present in a complex and calculated as the sum of the electrons on the metal ion and the number of electrons donated by the ligands.
`EAN=Z-X+Y`
where, `""`Z = Atomic number of the metal
X = Number of electrons of the metal ion from its atom
Y = Number of electrons donated by the ligands `[CU(NH_(3))_(4)]^(2+)`
Z = atomic number 29
X= 2
Y = 8 `EAN = Z-X+Y`
`=29-2+8=35`
EAN of copper is 35.
Discussion
17324.

What is the maximum number of compounds with the molecular formula C_(4)H_(11)N, which give an alkali soluble precipitate with benzenyl sulfonyl chloride?

Answer»
Discussion
17325.

Which of the following reactions does not occure ?

Answer»

`F_(2)+2Cl^(-)+ to 2F^(-)+Cl_(2)`
`Cl_(2)+2F^(-) to 2Cl^(-)+F_(2)`
`Br_(2)+2I^(-) to 2Br^(-)+I_(2)`
`Cl_(2)+2Br^(-) to 2Cl^(-)+Br_(2)`

Solution :`Cl_(2)` cannot DISPLACED `F^(-)`
Discussion
17326.

Which of the following is soluble in ammonia?

Answer»

`Cr(OH)_(2)`
`CU(OH)_(2)`
`Fe(OH)_(3)`
`AL(OH)_(3)`

ANSWER :B
Discussion
17327.

Write the structure of the aldehyde, carboxylic acid and ester that yield 4-methylpent-2-en-1-ol.

Answer»

Solution :4-methylpent-2-en-1-ol.
`CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-OH`
The STRUCTURE of ALDEHYDE, carboxylic acid and ester that WOULD yield the above compound are
(i) Aldehyde `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)=CH-CHO`
(ii) Acid: `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)=CH-COOH`
(iii) Ester:
`CH_(3) - underset(CH_(3))underset(|) CH-CH_(2)=CH-CH_(2)-COOR`
Discussion
17328.

The temperature at which most probable speed of CO molecules is twice that at 27^(@)C is :

Answer»

`108^(@)C`
108K
`927^(@)C`
`1200^(@)C`

ANSWER :C
Discussion
17329.

Using same quantity of current , which among Na, Mg and AI is deposited more during electrolysis of their molten salt :

Answer»

Na
Mg
AI
All in same amount

Answer :A
Discussion
17330.

When isopropyl iodide is treated with methyl iodide in the presence of sodium, the product is :

Answer»

Isobutene
ISOBUTANE
n-Butane
Isopentane

SOLUTION :`CH_(3)-overset(CH_(3))overset("|")(CH)-I+2Na+ICH_(3)rarrCH_(3)-underset("Isobutane")overset(CH_(3))overset("|")(CH)-CH_(3)`
Discussion
17331.

When chlorine is passed through acetic acid in presence of red phosporous, it forms

Answer»

ACETYL chloride
trichloro acetaldehyde
trichloro ACETIC acid
methyl chloride

Answer :C
Discussion
17332.

When the specific heat of a metallic element is 0.214 cal g^(-1)the atomic mass will be closed to which one of the following?

Answer»

1
12
30
66

Answer :C
Discussion
17333.

Which compound has appearence and conductivity similar to copper?

Answer»

TIO
`ReO_3 `
MNO
`Ti_2O_3`

ANSWER :B
Discussion
17334.

Which of the following compounds on thermal decomposition yields a basic as well as acidic oxides?

Answer»

`KClO_(3)`
`NaNO_(3)`
`K_(2)CO_(3)`
`MgCO_(3)`

SOLUTION :`2KClO_(3) to 2KCl +3O_(2)`
`NaNO_(3) to NaNO_(2)+O_(2)`
`K_(2)CO_(3) to X`
`MgCO_(3) to MGO +CO_(2)`
Discussion
17335.

The temperature of the Slag zone in the metallurgy of iron using blast furnace is…

Answer»

`1500 – 1600^@C`
`400 – 700^@C `
`800 - 1000^@C`
`1200 - 1500^@C`

ANSWER :C
Discussion
17336.

Which statement is/are about extrinsic conductor

Answer»

ADDITION of phosphorus as impurities in silicon makes p type SEMI conductor
addition of AL as impurities in silicon makes p type semi conductor
in n type semi conductor charge is carried by the HOLE
in p type semi conductor charge is carried by the ELECTRON

Answer :A::B
Discussion
17337.

Which of the following represents a plot of compressibility factor (Z) versus P at room temperature for helium?

Answer»




ANSWER :A
Discussion
17338.

Which of the following complexes can form d and I isomers:

Answer»

`[CO(NH_3)_4Cl_2]^+`
`[Co(NH_3)_2Cl_2]^+`
`[PT(NH_3)_2Cl_2]`
`CIS-[Co(EN)_2Cl_2]^+`

ANSWER :D
Discussion
17339.

Which of the following salts solution is/are acidic in nature

Answer»

`NaNO_(3)`
`LiCl`
`BeCl_(2)`
`KCN`

Solution :`BeCl^(2)` is the salt of weak base `Be^(OH)_(2)` and strong ACID HCl. It hydrolysis in water as
`BeCl_(2)+2H_(2)OrarrBe(OH)_(2)+2H^(+)+Cl^(-)`
Discussion
17340.

Which organic compounds is used in welding?

Answer»

`C_2H_4`
`C_2H_2`
`CH_4`
`C_2H_6`

ANSWER :B
Discussion
17341.

To stop bleeding from cut we use ferric chloride, it is because

Answer»

`FE^(3+)` ion coagulates blood, which is a negatively CHARGED SOL
`Fe^(3+)` ion coagulates blood, which is a POSITIVELY charged sol
`Cl^(-)` coagulates blood, which is a positively charged sol
`Cl^(-)` ion coagulates blood, which is a negatively charged sol

Answer :A
Discussion
17342.

What is the increasing oder of reactivity of the following in an E_(2) reaction with ethanolic KOH solution ?

Answer»

`IltIIltIIIltIV`
`IltII LT IV lt III`
`IIIltIltIIltIV`
`IV lt III lt II lt I`

SOLUTION :(III) is most reactive as it has most acidic Beta_H as WELL as it gives resonance stabilized alkene Next to (III) is (IV) as it is tertiary (I) is less reactive than (II) because (I) gives less substited alkene .
Discussion
17343.

When BaCl_(2) is added to an aqueous salt solution, a white precipitate is obtained. The anion among CO_(3)^(2-), SO_(3)^(2-) and SO_(4)^(2-) that was present in the solution can be

Answer»

`CO_(3)^(2-)` but not any of the other two
`SO_(3)^(2-)` but not any of the other two
`SO_(4)^(2-)` but not any of the other two
any of them

SOLUTION :`BaCl_(2)` REACTS with `CO_(3)^(2-), SO_(3)^(2-) and SO_(4)^(2-)` to form white ppt.
`{:(BaCl_(2)+CO_(2)^(2-) RARR underset("White ppt.")(BaCOdarr) + 2CL^(-)),(BaCl_(2)+SO_(3)^(2-) rarr underset("White ppt.")(BaSO_(3))+2Cl^(-)),(BaCl_(2)+SO_(4)^(2-) rarrunderset("White ppt.")(BaSO_(4))+2Cl^(-)):}`
Discussion
17344.

Write IUPAC name and formula of the alkane having formula C_8H_(18)and containing maximum number of methyl groups.

Answer»

SOLUTION :`H_3C-OVERSET(CH_3)overset(|)UNDERSET(CH_3)underset(|)C-overset(CH_3)overset(|)underset(CH_3)underset(|)C-CH_3`
IUPAC NAME 2,23,3-tetramethylbutane.
Discussion
17345.

To have practical applications why are cross links quetioined in rubber ?

Answer»

SOLUTION :By ADDING cross LINKS in RUBBER, leads to increasing in the elasticity of rubber, Thats why cross links are added to the rubber.
Discussion
17346.

Which of the following is radioactive alkali metal ?

Answer»

Fr
Ra
At
Rn

Answer :A
Discussion
17347.

Which is correct representation for a cell at equilibrium:

Answer»

`DeltaG^@=-2.303RTlogK_(eq)`
`E^@=(2.3.3RT)/(NF)logK_(eq)`
`- DeltaG^@=RT1nK_eq`.
All

Answer :D
Discussion
17348.

Which of thefollowing structure most closelyrespresentas intermedite in theelectrophilic brominatin of para -xylene ?

Answer»




ANSWER :C
Discussion
17349.

Write the structues of the product of the following reactons. (i)

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_007_S01##)`
Discussion
17350.

Write four name of antibiotics.

Answer»

Solution :(i) Pencillin
(II) Tetracycline
(iii) STREPTOMYCIN
(iv) Ampicilline
Discussion