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5401.

Two liquids, A andB form an ideal solution. At the specified temperature, the vapour pressure of pure A is 20 mm Hg while that of pure B is 75 mm Hg. If the vapour over the mixture consists of 50 mol percent A, what is the mole percent A in the liquid?

Answer»


ANSWER :`27.3` MOLE `%`
Discussion
5402.

There is blue colour formation if:

Answer»

Cu electrode is PLACED inside `AgNO_(3)` solution
Cu electrode is placed inside `ZnSO_(4)` solution
Cu electrode is placed inside dil `HNO_(3)`
Cu electrode is placed inside dil `H_(2)SO_(4)`

Answer :A::C
Discussion
5403.

Which metal is used for making coins and ornaments along with gold and other metals?

Answer»

Zn
Al
Cu
Fe

Answer :C
Discussion
5404.

What happens when the following are dry distilled (i) Calcium formate (ii) Calcium acetate and calcium formate (iii) Calcium benzoate?

Answer»

SOLUTION :(i) Formaldehyde
(ii) ACETALDEHYDE
(III) Benzophenone
Discussion
5405.

Two tautomeric structures are possible for

Answer»

`H_(2)SO_(4)`
`H_(2)S_(2)O_(8)`
`H_(2)S_(2)O_(7)`
`H_(2)SO_(3)`

ANSWER :D
Discussion
5406.

Which of the following differ from the others

Answer»

ruby
elektron
BELL metal
amalgam

Answer :A
Discussion
5407.

Which of formed by the addition of halogen to alkenes?

Answer»

Vic-dihalide
Gem-dihalide
Propane
Propene

Answer :D
Discussion
5408.

Which of the following statement is not correct about an inert electrode in a cell -

Answer»

it does not PARTICIPATE in the CELL reaction
it provides surface either for oxidation of REDUCTION
it provides surface for conduction of electrons
it provides surface for redox reaction

Answer :D
Discussion
5409.

Which element is present in vitamin B_(12) ?

Answer»

Fe(II)
Co(III)
ZN (I)
Co (II)

SOLUTION :Co(III)
Discussion
5410.

When two atomic orbitals linearly combine, they form

Answer»

ONE MOLECULAR ORBITAL
TWO molecular orbitals
Three molecular orbitals
Four Molecular orbitals

Answer :B
Discussion
5411.

Which of the following complex/ion only show linkage isomerism ?

Answer»

`[Co(NH_(3))_(4)(H_(2)O)CL]CN`<BR>`[Co(NH_(3))_(5)SCN]^(2+)`
`[Co(H_(2)O)_(6)]Cl_(3)`
`[Co(NH_(3))_(5)SO_(4)]Br`

Answer :B
Discussion
5412.

Which of the following species in paramagnetic:

Answer»

`CN^(-)`
`SnCl_(2)`
`C_(2)H_(2)`
`NO_(2)`

Answer :B::D
Discussion
5413.

Which of the following is/are not ture?

Answer»

The most radioactive elementpresent in pitchblende is uranium
`.^(32)P` is USED for the treatment of LEUKAEMIA.
`CO_(2)` present in the air contains `.^(12)C` only
Emission of `gamma`-rays changes the mass number but not atomicnumber.

Answer :a,d
Discussion
5414.

When acetyl chloride is reduced with LiAlH_4, the product formed is :

Answer»

METHYL alcohol
Ethyl alcohol
Acetaldehyde
Acetone

Answer :B
Discussion
5415.

When benzene sulphonic acid and p-nitrophenol are treated with NaHCO_(3) , the gases released respectively are

Answer»

`SO_(2), NO_(2)`
`SO_(2),NO`
`SO_(2),CO_(2)`
`CO_(2),CO_(2)`

SOLUTION :
Discussion
5416.

Why are substance like platinum and palladium often used for carrying out electrolysis of aqueous soltion?

Answer»


ANSWER :Platinum and PALLADIUM are INERT electrodes and do not react with the ions of the electrolyte or with the PRODUCTS formed in ELECTROLYSIS. So they are used as electrodes.
Discussion
5417.

Which of the following reactions will yield,2,2-dibromopropane:

Answer»

`HC-= CH + 2HBrrarr`
`CH_3-C-=CH + 2HBrrarr`
`CH_3-CH=CH_2 + HBr RARR`
`CH_3CH=CHBr+HBr rarr`

Answer :B
Discussion
5418.

When pure solvent flows out of the solution through the semipermeable membrane, thephenomenon is called :

Answer»

REVERSE OSMOSIS.
INVERSE osmosis.
REVERSIBLE osmosis.
IRREVERSIBLE osmosis

Solution :reverse osmosis.
Discussion
5419.

What is the significance of leaching in the extraction of aluminium ?

Answer»

Solution :LEACHING helps in removal of impurities such as `TiO_2, SiO_2` and `Fe_2O_3` from the Bauxite ore.
`Al_2O_(3(s)) + 2NaOH_((aq)) + 3H_2O_((l))UNDERSET(2Na[Al(OH)_(4)])OVERSET(473K - 523K)(rarr)"sodium aluminate"`
`SiO_(2(l)) + 2NaOH_((aq))overset(473K - 523K)(rarr) underset("Sodium silicate")(Na_2SiO_(3(aq))) + H_2O_((l))`
`2Na[Al(OH)_(4)]_((aq)) + 2CO_(2(g)) to Al_2O_(3)cdot xH_2O_((s)) + 2NaHCO_(3(aq))`
`Al_2O_3cdotxH_2O_((s)) overset(1473K)(rarr)Al_2O_(3(s)) + xH_2O`.
Discussion
5420.

Which of the following double salt does not exists?

Answer»

`(NH_(4))_(2)SO_(4)*CuSO_(4)*6H_(2)O`
`(NH_(4))_(2)SO_(4)*FeSO_(4)*6H_(2)O`
`(NH_(4))_(2)SO_(4)*ZmSO_(4)*6H_(2)O`
`(NH_(4))_(2)SO_(4)*NiSO_(4)*6H_(2)O`

ANSWER :A
Discussion
5421.

Z' in the following sequence of reactions is C_(6)H_(6)overset(HNO_(3)//H_(2)SO_(4))underset(Delta)rarr W overset(Zn//HCl)rarr X overset(NaNO_(2))underset(HCl)rarr Y overset(H_(2)O//H_(3)PO_(2))rarr Z

Answer»




SOLUTION :
Discussion
5422.

Whichof the following is identical in cis - 3- hexene and trans - 3- hydrogenation

Answer»

Rate of HYDROGENATION
Product of hydrogenation
Adsorption of ALUMINA
None of the three is identical

Solution :CIS - 3 - Hexane and trans - 3- hexenewill FORM same product on hydrogenation .
Discussion
5423.

Whatis theamountof glucose presentin human blood ?

Answer»

150 MG/DL
50 mg /dl
100 mg /dl
1000 mg / dl

ANSWER :C
Discussion
5424.

The solubility of N_(2) in watcr at 300 K and 500 torr partial pressure is 0.01 g L ^(-1). The solubility (in g L ^(-1)) at 750 torr partial pressure is :

Answer»

`0.0075`
`0.005`
`0.02`
`0.015`

Solution :ACCORDING to Henery law
`(P_(1))/(P _(2)). (S_(1))/(S_(2))`
`(500)/( 750) . (0.01)/( S_(2))`
`. S_(2). (750*0.01)/( 500) . 0.015 g //L`
Discussion
5425.

Which of the following is in the increasing order of the ionic character

Answer»

`PbCl_(4) LT PbCl_(2) lt CaCl_2 lt NaCl`
`PbCl_(2) lt PbCl_(4) lt CaCl_(2) lt NaCl`
`PbCl_(2) lt PbCl_(4) lt NaCl lt CaCl_(2)`
`PbCl_(4) lt PbCl_(2) lt NaCl lt CaCl_(2)`

Solution :`PbCl_(4) lt PbCl_(2) lt CaCl_2 lt NaCl` is the INCREASING order of ionic character.
Discussion
5426.

The state of balance between evaporation and condensation of a liquid is called

Answer»

CRITICAL state
Sublimation
Dynamic equilibrium
Crystallisation

ANSWER :C
Discussion
5427.

The solubility of CaF_(2)is 2xx10^(-4)mol L^(-1) . Its solubility product is :

Answer»

`2.0xx10^(-8)`
`4.0xx10^(-12)`
`8.0xx10^(-12)`
`3.2xx10^(-11)`

Solution :`K_(sp)=[CA^(2+)][F^(-)]^(2)`
`[Ca^(2+)]=2xx10^(-4), [F^(-)]=2xx2xx10^(-4)`
`K_(sp)=(2xx10^(-4))(4xx10^(-4))^(2)`
`3.2xx10^(-11)`
Discussion
5428.

The temperature at which 10% aqueous solution (w/V) of glucose will exhibit the osmotic pressure of 16.4 atm, is (R=0.082 dm^(3)atm K^(-1)mol^(-1))

Answer»

`360^(@)C`
180 K
90 K
360 K

Answer :D
Discussion
5429.

Write structures of the compound whose IUPAC names are as follows : 3-Cyclohexylpentan-3-ol

Answer»

SOLUTION :
Discussion
5430.

Which of the following is pyrophosphorous acid ?

Answer»

`H_(3)PO_(3)`
`H_(4)P_2O_(6)`
`H_(4)P_2+O_(7)`
`H_(4)P_(2)O_(5)`

ANSWER :D
Discussion
5431.

Which of the following is a conjugate acid-base pair

Answer»

HCL, NaOH
`NH_(4)Cl, NH_(4)OH`
`H_(2)SO_(4), HSO_(4)^(-)`
KCN, HCN

Solution :`H_(2)SO_(4)HARR H^(+) + HSO_(4)^(-)`.
Discussion
5432.

Which one of the following compounds is capable of existing in a meso form?

Answer»

3,3-Dibromopentane
4-Bromo-2-pentanol
3-Bromo-2-pentanol
2,3-Dibromopentane

Answer :C
Discussion
5433.

The SN^2 mechanism for, R-X + KOH(aq) rarr R-OH+KX follows with:

Answer»

`100 %` INVERSION
`50 %` inversion
`40 %` inversion
`30 %` inversion

Answer :A
Discussion
5434.

Which of the following types of carbonyl groups will produce an oxime on reaction with:

Answer»

(`##MBD_HKR_CHE_XII_P02_C12_E07_513_O01##`)
(##MBD_HKR_CHE_XII_P02_C12_E07_513_O02##)
(##MBD_HKR_CHE_XII_P02_C12_E07_513_O03##)
(##MBD_HKR_CHE_XII_P02_C12_E07_513_O04##)

ANSWER :B
Discussion
5435.

Write the structure of following compound: Fe(CO)_5

Answer»

SOLUTION :TRIANGLED bipyramidal
Discussion
5436.

Which will eliminate CO_(2) only on heating?

Answer»

`Me-underset(O)underset(||)C-CH_(2)-COOH`
`Ph-underset(O)underset(||)C-CH_(2)-SO_(2)H`

`CH_(2)=CH-CH_(2)-COOH`

ANSWER :A::C::D
Discussion
5437.

Which of the following derivatives is same for glucose and fructose

Answer»

PHENYL hydrazine
Oxime
PENTA ACETYL derivatives
Osazone

ANSWER :D
Discussion
5438.

Three compounds I, II, and III are given. (I) (II) The compounds (A), (B) and (C ), respectively, are:

Answer»

I, II, and III
I, III, and II
III, II, and I
III, I, and II

Solution :`B_(2)H_(6)//THF` besides reacting at `(C=C)` also selectively REDUCES only `(-COOH)` group to `(-CH_(2)OH)` group in cyclic ester.
Discussion
5439.

When the following ketose exists in its D-configuration, the total number of stereoisomers in its furanose form is :

Answer»


SOLUTION :NA
Discussion
5440.

Transition elements form alloys easily because they have :

Answer»

Same ATOMIC number
Same ELECTRONIC configuration
Nearly same atomic size
None

Answer :C
Discussion
5441.

What is action of 2 %HNO_3 on magnesium metal ? Give equation

Answer»

Solution :Magnesium liberates HYDROGEN with `2%` dilute `HNO_3` which reduces `HNO_3` to give `NH_4NO_3`.
2MG + 10HNO_3 RARR 4Mg (NO_3)_2 + NH_4NO_3 + 3H_2O`
Discussion
5442.

Two complexes PtCl_4.2NH_3 and PtCl_4.2KCl do not give precipitate of AgCl with AgNO_3 solution. The conductance studies indicate presence of zero and 3 ions per mol in their solutions. The structures of these complexes are ________.

Answer»

`[PT(NH_3)_2Cl_2]Cl_2, K_2[PtCl_6]`
`[Pt(NH_3)_2]Cl_4, K_2[PtCl_6]`
`[Pt(NH_3)_2Cl_4], K_2[PtCl_6]`
`[Pt(NH_3)_2Cl_4], K_2[PtCl_5]CL`

ANSWER :C
Discussion
5443.

What is retention of configuration?

Answer»

Solution :If there is no CHANGE in the configuration at asymmetric carbon during a chemical reaction is KNOWN as RETENTION of configuration.
Discussion
5444.

Which of the following can exhibit geometrical isomerism ?

Answer»

`[MnBr_(4)]^(2-)`
`[Pt(NH_(3))_(3)Cl]^(+)`
`[PtCl_(2)P(C_(2)H_(5))_(3)]_(2)`
`[Fe(H_(2)O)_(5)NO]^(2+)`

Solution :is a bridged complex and shows GEOMETRICAL isomerism.
Discussion
5445.

What is the final product?

Answer»

`C_2H_4`
`C_2H_5 - O - C_2H_5`
`C_2H_5OH `
`C_2H_5 - O - SO_3H`

ANSWER :B
Discussion
5446.

Which one of the following is a slow reaction ?

Answer»

Rusting of iron
Combustion of carbon
Reaction between `BaCl_(2)` and dil. `H_(2)SO_(4)`
Reaction between ACIDIFIED `K_(2)Cr_(2)O_(7)` with NaCl

Solution :Rusting of iron
Discussion
5447.

Two first order reactions half lives in the ratio 3:2. If t_(1) and t_(2) are the time periods for 25% and 75% completion for the first and second reactions respectively, find t_(1):t_(2)

Answer»

`0.0311:1`
`0.420:1`
`0.273:1`
`0.119:1`

SOLUTION :`((0.693/(3X)xxt_(1)))/((0.693/(2x)xxt_(2)))=(log(100/75))/(log(100/25)),(2x)/(3x)XX(t_(1))/(t_(2))=(log(4/3))/(2log2),(t_(1))/(t_(2))=3/2xx0.1249/(2xx0.3010)=0.311`
Discussion
5448.

Which statement is not correct for hydrogen peroxide ?

Answer»

Pure `H_2O_2` is fairly stable
It sometimes ACTS as a reducing agent.
It acts as an oxidising agent
Aqueous SOLUTION of `H_2O_2` is WEAKLY basic.

Answer :D
Discussion
5449.

Which on heating with aqueous KOH, produces acetaldehyde ?

Answer»

`CH(3)-CH-CL`
`CH_(3)-CO-Cl`
`CH_(3)-CH_(2)-Cl`
`UNDERSET(CH_(2)-Cl)underset(|)CH_(2)-Cl`

Answer :A
Discussion
5450.

Which of the following compounds does not give N_(2) on heating?

Answer»

`NaN_(3)`
`(NH_(4))_(2)SO_(4)`
`NH_(4)NO_(2)`
`(NH_(4))_(2)Cr_(2)O_(7)`

Answer :B
Discussion