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5551.

The reduction of an oxide by aluminium is called :-

Answer»

Bayer.s process
Goldschmidt.s aluminothermite process
Hall.s process
van Arkel process

Answer :B
Discussion
5552.

The wrongly matched amongst the following is :

Answer»

BOILING point /`K-HClltHBrltHIltHF`
Acidic STRENGTH `-HFltHclltHBrltHI`
STABILITY `-HFltHClltH-BrltHI`
Bond DISSOCIATION energy `-HClltHBrltHIltHF`

ANSWER :D
Discussion
5553.

Wax is an example of:

Answer»

IONIC CRYSTAL
COVALENT crystal
Molecular crystal
Metallic crystal

Answer :C
Discussion
5554.

What is the reducing agent used in Clemmensen's reduction?

Answer»

Solution :Zinc AMALGAM and CONCENTRATED HCl is used.
Discussion
5555.

What is the repeating structural unit in polythene polymer ?

Answer»

SOLUTION :`(-CH_(2) - CH_(2)-)_(N)`
Discussion
5556.

Thermal decomposition of HI(g) on Gold surface follows Zero order kinetics. With initial pressure 1000 mm. If the pressure after 20 sec is 960 mm w.r.t HI(g) rate constant is

Answer»

40
20
2
`sqrt28`

ANSWER :C
Discussion
5557.

Total number of configurational isomers of taritaric acid is:

Answer»

2
3
4
5

Answer :B
Discussion
5558.

Write the structure of XeF_(4)

Answer»

SOLUTION :
Discussion
5559.

Which of the following alkene has the Z configuration along the double bond ?

Answer»




ANSWER :A::C
Discussion
5560.

Which are strong acids ? (P)HI, (Q)HNO_3 , (R)H_2SO_3

Answer»

Q only
P and Q only
Q and R only
P,Q and R

ANSWER :B
Discussion
5561.

Which of the following cations precipitates as their carbonates?

Answer»

`CA^(+2)`
`Sr^(+2)`
`Ba^(+2)`
`Zn^(+2)`

SOLUTION :`CaCO_(3), SrCO_(3), BaCO_(3)`
Discussion
5562.

Which of the following does not give any diffraction bands with X-rays ?

Answer»

`BaSO_(4)` 
Graphite
Diamond
Plastic

ANSWER :D
Discussion
5563.

When lead stroage battery discharges

Answer»

`SO_(2)` isevolved
`PbSO_(4)`is CONSUMED
Lead is formed
`H_(2)SO_(4)` is consumed

Solution :`H_(2)SO_(4)` is consumed when lead stroage BATTERY is DISCHARGED
Discussion
5564.

Write the structure of -D(+)glucopranose .

Answer»

SOLUTION :
Discussion
5565.

Which of the following will not give aldol condensation ?

Answer»

Phenyl acetaldehyde
2 - Methylpentanal
Benzaldehyde
1 - Phenylpropanone

Solution :Benzaldehyde will not give aldol CONDENSATION due to ABSENCE of `alpha`-H atom.
Discussion
5566.

Which of the following pairs of molecule have partically the same mass?

Answer»

`D_(2)O` and HTO
`H_(2)O` and HTO
`H_(2)O` and `D_(2)O`
DTO and HDO

Solution :`D_(2)O` or `(""^(2)H_(2))O and HTO` or `(""^(1)H^(3)H)O` have PRACTICALLY the same mass.
Discussion
5567.

Which of the following pairs are tautomers?

Answer»

`CH_(3)CH_(2)CHO and CH_(3)COCH_(3)`
`CH_(3)CHOandCH_(2)=CHOH`
`C_(2)H_(5)COC_(2)H_(5)andCH_(3)COC_(3)H_(7)`
`CH_(3)-CH=CH-CH_(3)andCH_(3)CH_(2)CH=CH_(2)`

ANSWER :B
Discussion
5568.

Which of the followingligands may be flexidentate ?

Answer»

EDTA
`CO_(3)^(-2)`
`NO_(3)^(-)`
All of these

ANSWER :D
Discussion
5569.

What is average life and is percentage of argon in air ?

Answer»

Solution :AVERAGE LIFE = 5.5 DAYS
`%` of ARGON = 1
Discussion
5570.

Which of the following transition elements exhibit +8 oxidation state

Answer»

CU and Zn
Ru and OS
W and Pb
Ag and Au

Answer :B
Discussion
5571.

What is Tollen's reagent?

Answer»

SOLUTION :`CH_3CH_2underset(CH_3) UNDERSET(|)CHCHO`
Discussion
5572.

Which of the following undergoes haloform reaction?

Answer»

`HCHO`
`(CH_(3))_(2)CO`
`C_(2)H_(5)CL`
`CH_(3) - O - CH_(3)`

Answer :B
Discussion
5573.

Which of the following is novolac ?

Answer»




ANSWER :D
Discussion
5574.

Which compound cannot be used as Reducing agent -

Answer»

`CO_(2)`
`HNO_(2)`
`H_(3)PO_(3)`
`H_(2)SO_(3)`

ANSWER :A
Discussion
5575.

Which order of Boiling points is correct

Answer»

`He LT Ne lt Ar lt O_2 lt N_2`
`He lt Ne lt N_2 lt Ar lt O_2`
`He lt Ne lt N_2 lt O_2 lt Ar`
`He lt Ar lt N_2 lt Ne lt O_2`

SOLUTION :Order of b. PT : `{:(He lt Ne lt N_2 lt Ar lt O_2),(""darr),("Weak VANDER WALLS forces"):}`
Discussion
5576.

Which of the following statements about the composition of the vapour over an ideal 1:1 mol mixture of benzene and toluene is correct? Assume that the temperature is constant at 25^(@)C. (Given: vapour pressure Date at 25^(@)C, benzene=12.8 kP, toluene=3.85 kPa)

Answer»

<P>The vapour phase will contain EQUAL AMOUNTS of benzene and tollutene.
Not enough information is given to make a predication.
The vapour phase will contain a higher precentage of benzeene.
The vapour phase will contain a higher PERCENTAGE of toluene.

Solution :`P_("Benzene")=X_("Benzene")xxP_("Benzene")^(@)`
=`1//2xx121.8 K Pa`
`P_("tonene")=X_("toluene")xxP_("toluene")^(@)`
=`1//2xx3.85=1.925kPa`
Since `P_("Benzene")` is more than that of toluene the vapour phses will ciontain higher percentage of benzene
Discussion
5577.

Which of the following statements are correct ? (I) Among the species CO, CO_2, CO_3^(2-)and HCHO, CO_3^(2-)has the weakest carbon-oxygen bond. (II) Both Sphalerite and galena ores can be concentrated by froth floatation process. (III) Bosch process involves the process of coke at 1273 K. (IV) Heavy water differs only slightly from ordinary water in its chemical properties through the reaction of D_2O are slightlyfaster than those of H_2O.

Answer»

I, II, IV
II, III
I,III
I,II,III

Answer :D
Discussion
5578.

Which of the following is most reactive by S_(N)I ?(tBu = tert-Butyl group)

Answer»




SOLUTION :
Discussion
5579.

The solubility of a gas in water at 300 K under a pressure of 100 atmospheres is 4xx10^(-3)"kg L"^(-1). Therefore, the mass of the gas in kg dissolved in 250 mL of water under a pressure of 250 atmospheres at 300 K is

Answer»

<P>`2.5xx10^(-3)`
`2.0xx10^(-3)`
`1.25xx10^(-3)`
`5.0xx10^(-3)`

Solution :By HENRY's law`""m=K_(H)p`
at constant temperature, `K_(H)` is constant.
`therefore ` At two different pressures,
`(m)/(m')=(p)/(p')=(4xx10^(-3)"KG L"^(-1))/(m')=(100)/(250)`
`"orm'"=(250)/(100)xx4xx10^(-3)"kg L"^(-1)`
`=10^(-2)"kg L"^(-1)=(10^(-2))/(4)"kg in 250 mL"`
`=2.5xx10^(-3)kg.`
Discussion
5580.

Three compounds A,B and C all have molecular formula C_(6)H_(8) All the compound rapidly decolourise Br_(2) in C Cl_(4). All three give a position test with Baeyer's reagent. And all the three are soluble in cold conc. H_(2)SO_(4). Compound A gives a precipitate when treated with ammonical AgNO_(3) solution. but compounds B and C do not compounds A and B both yield pentane (C_(5)H_(12)) when they are treated with excess H_(2) in the presence of Pt catalyst. Under these conditions, compound C absorbs only one mole of H_(2) and gives a product with the formula C_(5)H_(10)

Answer»

SOLUTION :(a) `CH_(3)-CH_(2)-CH_(2)-C-=CH`
(B) `CH_(3)C-=C-CH_(2)CH_(3)`
Discussion
5581.

When ethyl alcohol reacts with acetic acid, the products formed are

Answer»

Sodium ethoxide + hydrogen
Ethyl acetate + water
Ethyl acetate + soap
Ethyl alcohol + water

Solution :`C_(2)H_(5)OH + CH_(3)COOH underset("Esterfication")overset(H_(2)SO_(4))to underset("Ethyl acetate")(CH_(3)COOC_(2)H_(5))+ H_(2)O`
Discussion
5582.

The species which does not show paramagnetism is:

Answer»

`O_2`
`O_2^+`
`O_2^(2+)`
`H_2^+`

ANSWER :C
Discussion
5583.

Write the IUPAC name of the following: CH_(3)-underset(Br)underset(|)(C)=overset(CH_(3))overset(|)(C)-CH_(2)OH

Answer»

SOLUTION :3-Bromo-2-methylbut-2-ene-1-ol.
Discussion
5584.

The resistnce of 0.1 N solution of a salt is found to be2.5xx10^(3) ohms. The equivalent conductance of the solution is ( cell constant =1.15cm^(-1))

Answer»

4.6
5.6
6.6
7.6

Answer :A
Discussion
5585.

When 3,3-dimethyl-2-butanol is heated with H_(2)SO_(4) the major product obtained is

Answer»

CIS and TRANS ISOMERS of 2,3-dimethyl -2-butene
3,3-dimethyl-1-butene
2,3-dimethyl-1-2-butene
2,3-dimethyl-1-butene

Solution :
Discussion
5586.

Which of the following statements is incorrect regarding physical adsorption?

Answer»

It occurs because of VAN der WAALS forces.
More easily liquefiable GASES are adsorbed readily.
Under high pressure it results in multimolecular layer on adsorbent surface.
ENTHALPY of adsorption `(DeltaH_(ADS))` is low and positive.

Solution :`DeltaH_(ads)` is low but negative
Discussion
5587.

Which of the following reaction occurs at the cathode of a common dry cell

Answer»

`MntoMn^(2+)+2E^(-)`
`2MnO_(2)+Zn^(2+)+2e^(-)toZnMn_(2)O_(4)`
`2ZnO_(2)+Mn^(2+)+2e^(-)toMnZn_(2)O_(4)`
`ZntoZn^(2+)+2e^(-)`

Solution :In COMMON dry cell.
Anode: `ZntoZn^(++)+2e^(-)`
CATHODE: `2MnO_(2)+Zn^(++)+2e^(-)toZnMn_(2)O_(4)`.
Discussion
5588.

Which hydride is neutral ?

Answer»

`H_2S`
`H_2O`
`H_2Se`
`H_2Te`

ANSWER :B
Discussion
5589.

The valency of the metal , if its at.mass and ECE respectively are 63.56 and 3.29 xx 10^(-4) is

Answer»

1
2
3
4

Solution :ELECTRO chemical equivalent = `("Eq.mass")/(96,500)`
Eq. wt = `("At.mass")/("VALENCY (N)")`
`3.29 XX 10^(-4) = (63.56)/(3.24 xx 10^(-4) xx 96,500) = 2.002 = 2`
Discussion
5590.

Which of the following compounds shows optical isomerism ?

Answer»

`[Cu(NH_(3))_(4)]^(3-)`
`(ZnCl_(4))^(2-)`
`[Cr(C_(2)O_(4))_(3)]^(3-)`
`[CO(CN)_(6)]^(3-)`

Solution :`[Cr(OX)_(3)]^(3-)` will SHOW optical isomerism.
Discussion
5591.

What is the chemical name of aspirin.

Answer»

Solution :Chemical NAME : 2-Acetoxy benzoic ACID (ACETYL salicylic acid).
Discussion
5592.

The vapour pressure of pure benzene at 88^(@)C is 957mm and that of toluene at the same temperature is 379.5mm. Calculate the composition of a benzene-toluene mixture boiling at 88^(@)C

Answer»

Solution :Since the b.p. is that TEMPERATURE at which the vapour PRESSURE of the liquid is equal to the ATMOSPHERIC pressure, i.e., 760mm.
we have,
`p=x_(A).p_(A)^(0)+x_(B).p_(B)^(0)`…….(Eqn.3)
`760=x_("benzene")957+x_("toluene")379.5`
As `x_("benzene")+x_("toluene")=1`
`:.760=957.x_("benzene")+379.5(1-x_("benzene")`
`:.x_("benzene")=0.6589`
Discussion
5593.

When dimethyl glyoxime solution is added to an aqueous solution of nickel chloride in presence of ammonium hydroxide

Answer»

a black PPT is formed
a blue ppt is formed
a rose red ppt is formed
violet ppt is formed

Solution :`Ni^(2+)+2dmg to underset("Red ROSY ppt")([Ni(DMG)_(2)])`
Discussion
5594.

Which of the following is the most electronegative element?

Answer»

O
S
Se
Te

Solution :OXYGEN , being first member of group 16 elements, has the smallest SIZE and HIGHEST ELECTRONEGATIVITY.
Discussion
5595.

Use the data given in the following table to calculate the molar mass of naturally occurring argon. {:("Isotope","Isotopic molar mass","Abundance"),(.^(36)Ar,"35.96755 g mol"^(-1),"0.337"),(.^(38)Ar,"37.96272 g mol"^(-1),"0.063"),(.^(40)Ar,"39.9624 g mol"^(-1),"99.600):}

Answer»

Solution :`"Molar MASS of Ar"=Sigmaf_(i)A_(i)`
`""=0.00337xx35.96755+0.00063xx37.96272+0.99600xx39.96925`
`""=39.948" G mol"^(-1)`.
Discussion
5596.

Which of the following can show tautamerism?

Answer»




All of these

Answer :D
Discussion
5597.

Which of the following concepts is (are) wrong?

Answer»

If for, `AtoB" "DeltaH=+q` CAL
then for, `BtoA" "DeltaH=-q` cal
If for, `AhArrB` eqb. CONSTANT = K
then for, `BhArrA` eqb. Constant = `1/K`
If for, `AtoB` RATE constant = k
then for, `BtoA` rate constant `nek`
If for, `AtoB` energy of ACTIVATION = E
then for, `BtoA` energy of activation = -E.

Answer :D
Discussion
5598.

Which of the following statements is not correct regarding halides of group 13 elements ?

Answer»

`BF_(3)` is a weaker Lewis acid than `BCl_(3)`
Boron halides act as Lewis acids.
The TENDENCY of form `ppi-ppi` double bond is less in `BF_(3)` than in `BCl_(3)`.
Aluminium halides exist as DIMERS but corresponding boron halides are monomers.

Solution :`BF_(3)` has maximum tendency to form `ppi-dpi` bonds.
Discussion
5599.

Which statement is wrong for polymer ?

Answer»

They are non-conductor of electricity
Their MOLAR MASS is very LESS
They scatter the LIGHT
They are more dense

Solution :Their molar mass is very less
Discussion
5600.

Which can show haloform reaction :

Answer»

HCHO
`(CH_3)_2CO`
`CL(_+3)-O-CH_3
`CH_3CH_2Cl`

Answer :B
Discussion