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18801.

The volume in ml of 0.1 N HCl required to react completely with 1.0 gm mixture of Na_(2)CO_(3)and NaHCO_(3) containing equimolar amounts of the two compounds is

Answer»

`157.9` ML
`152.6` ml
`200` ml
`98.5` ml

SOLUTION :N/A
Discussion
18802.

Value of Henry's constant K_(H) ………. .

Answer»

<P>increases with increase in TEMPERATURE
decreases with increases in temperature
remains consant
first increases, then decreases

Solution :`p_(A)=K_(H)x_(A)`. At higher temperature, `x_(A)` is less. Hence, at the same partial pressure, `p_(A),K_(H)` will be more.
Discussion
18803.

What happens when persistent dialysis of a colloidal solution is carried out?

Answer»

Solution :The STABILITY of a colloidal sol is due to the presence of a small amount of the electrolyte. On PERSISTENT DIALYSIS, the electrolyte is completely removed. As a result, colloidal solution becomes UNSTABLE. Hence, it gets coagulated.
Discussion
18804.

Which of the following ordersof stability are correct -

Answer»

`CH_(3)OVERSET(oplus)(C)HOCH_(3)gtCH_(3)overset(oplus)(C)HCH_(2)OCH_(3)`
`Foverset(oplus)(C)H_(2)gtFCH_(2)overset(oplus)(C)H_(2)`
`Foverset(oplus)(C)H_(2)gtFCH_(2)overset(oplus)(C)H_(2)`
`FCH_(2)COO^(Theta)ltCH_(3)COO^(Theta)`

Answer :A::B
Discussion
18805.

Which of the following is not globular protein?

Answer»

keratin
haemoglobin
insulin
thyroglobulin

Answer :A
Discussion
18806.

Which among the following statement are correct with regard to alkyl halides?

Answer»

Alkyl halides on heating with aq NaOH GIVES alcohols
`1^(@)` alkyl halides produced by `SN_(2)` MECHANISM
`2^(@)` and `3^(@)` alkyl halides undergo substiution by `SN_(1)` mechanism
all the above

Answer :D
Discussion
18807.

Which alkali metal bicarbonates does not exist as solid ?

Answer»

`LiHCO_3`
`KHCO_3`
`CSHCO_3`
`NaHCO_3`

ANSWER :A
Discussion
18808.

Which one of the following compound has R configuration ?

Answer»

I
II
III
IV

Answer :D
Discussion
18809.

What are the products formed when methoxy ethane is treated with hydroiodic acid?

Answer»

Phenol+ iodomethane
Iodomethane + Ethanol
IODOETHANE + METHANOL
Iodobenzene+ Methane

SOLUTION :Iodomethane + Ethanol
Discussion
18810.

The SOP, E^(@) for the half reactions are Zn to Zn^(2+) + 2e , E^(@) = + 0.76 V Ag to Ag^(+) + e , E^(@) = -0.77 V E^(@) of the cell , Ag^(+)+ Zn to Zn^(2+) + Ag is :

Answer»

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

Solution :`E_("CELL")^(@) = E_(OP_(Zn))^(@) + E_(RP_(Ag))^(@) = 0.76 + 0.77 = 1.53` V
Discussion
18811.

Write the IUPAC name of CH_(3)COCH_(2)COCH_(3)

Answer»

SOLUTION :PENTANE -2, 4 - DIONE.
Discussion
18812.

The reagent used for converting ethanoic acid to ethanol is

Answer»

`LiAlH_4`
`H_2//Ni`
`PCl_3`
`NaBH_4`

ANSWER :A
Discussion
18813.

The set of molecule having two different bond angles is 1. Cl_(3),2.XeF_(6),3.XeOF_(4),4.PCl_(5),5.BF_(3)

Answer»

`1,2,3,4`
`1,2,3,5`
`3,4`
`2,3,4`

Solution :`ICl_(3):180^(@)` and `90^(@),XeF_(6):72^(@),90^(@)`
`XeOF_(4):90^(@),120^(@),PCl_(5):120^(@),90^(@)`
Discussion
18814.

Which of the following oxoacids of halogen doesn't exist

Answer»

HOBrO
HOF
`HOBrO_2`
`HOIO_3`

ANSWER :A
Discussion
18815.

Which of the following ion has maximum Second ionisation enthalpy?

Answer»

`V^(+)`
`Sc^(+)`
`Cr^(+)`
`MN^(+)`

Solution :`Cr^(+) " has" d^(5)` CONFIGURATION
Discussion
18816.

Which of the following statements are correct about stability of chelates ?

Answer»

As the no. of rings in complex increases, stability of chelate also increases
A chelate having FIVE memberd ring on more stable if it contains DOUBLE bonds
A chelate having six memberd ring in more stable if it does not contain double bonds
Chelating ligands are atleast bidentate ligands

Solution :The more rings that are formed by the polydentate ligand in chelation, the more stable the complex is Eg.. EDTA FORMS five rings as is a hexadentate ligand. Its complexes with even `Ca^(2+)` ion are stable. Chelate compounds are more stable, if they posses alternate single and double bonds which would HELP DELOCALISATION of electron cloud.
Discussion
18817.

What polymer is used in the manufacture of paints and lacquers ?

Answer»

BAKELITE
Glyptal
Polypropene
POLY VINYL CHLORIDE

Answer :B
Discussion
18818.

Which of the following is least reactive toward S_(N)Ar?

Answer»




ANSWER :C
Discussion
18819.

Which of the following reagents converts both acetaldehyde and acetone to alkanes

Answer»

`Ni//H_(2)`
`LiAlH_(4)`
`I_(2)//NAOH`
`Zn-Hg//HCl`

ANSWER :D
Discussion
18820.

When 6 faraday electricity is pass through aqueous solution of silver nitrate, copper sulphate and gold chloride (AuCl_(3)), then what ratio of mole of metals obtained at cathode ?

Answer»

`1:1:1`
`3:2:1`
`1:2:3`
`6:3:2`

Solution :`AgNO_(3) to Ag^(+)+NO_(3)^(-)`
`Ag^(+)+E^(-) to Ag`
`therefore 6Ag^(+)+6e^(-) to 6Ag` (6 moles of Ag obtained by 6F)
`CuSO_(4) to CU^(2+)+SO_(4)^(2-)`
`Cu^(2+)+2E^(-) to Cu`
`therefore 3Cu^(2+)+6e^(-) to 3Cu` (3 moles of Cu obtained by 6F)
`AuCl_(3) to Au^(3+)+3CL^(-)`
`Au^(3+)+3e^(-) to Au`
`therefore 2Au^(3+)+6e^(-)to2Au` (2moles of Au obtained by 6F)
So, mole reaction of Ag, Cu and Au metal is 6:3:2.
Discussion
18821.

Which of the following reagents may be used to distinguish between phenol and benzoic acid

Answer»

AQUEOUS NaOH
Tollen's reagent
Molisch reagent
Neutral `FeCl_(3)`

Solution :Neutral `FeCl_(3)` reacts with phenol and give VIOLET coloured COMPLEX.
Discussion
18822.

Which of the following is used in the reduced sleepiness?

Answer»

CAFFEINE
morphine
sulphanilide
p-aminobenzene sulphonic acid

Solution :caffeine
Discussion
18823.

Two liquids A and B form an ideal solution at temperature T. When the total vapour pressure above the solution is 400 torr, the mole fraction of A in the vapour phase is 0.40 and in the liquid phase 0.75. What are the vapour pressure of pure A and pure B at temperature T?

Answer»


ANSWER :`P_a^0=2.133.33" TORR",P_B^0=960.0" torr"`
Discussion
18824.

Which of the following will show optical isomerism as well as geometrical isomerism.

Answer»




ANSWER :A::C::D
Discussion
18825.

Which is true for the following isomeric forms I & II respectively :

Answer»

`{:(IgtII,IgtII,IIgtI,IgtII):}`
`{:(IIgtI,IIgtI,IIgtI,IIgtI):}`
`{:(IgtII,IgtII,IgtII,IgtII):}`
`{:(IIgtI,IIgtI,IgtII,IgtII):}`

ANSWER :D
Discussion
18826.

Which of the following is coloured compound

Answer»

`CuF_(2)`
`CUI`
`NaCl`
`MgCl_(2)`

Answer :A
Discussion
18827.

what is DeltaE for a system that does 500 cal of work pm surrounding and 300 cal of heat is adsorbed by the system ?

Answer»

`-200 CAL `
`- 300 cal `
`+ 200 cal `
` + 300 cal `

Solution :`DeltaE =q+W=300+(-500)=-200 cal `
Discussion
18828.

Which of the following is not an antipyretic ?

Answer»

Aspirin
Paracetamol
Barbituric ACID
Phenacetin

Answer :C
Discussion
18829.

Write the structure of perchloric acid (HCIO_4)

Answer»

SOLUTION :
Discussion
18830.

Which of the following statements is incorrect regarding benzyl chloride ?

Answer»

It gives WHITE precipitate with alcoholic `AgNO_(3)`
It is an aromatic compound with SUBSTITUTION in the side chain
It undergoes nucleophilic substitution reaction
It is LESS reactive than vinyl chloride

ANSWER :4
Discussion
18831.

Which one of the following is used to cure headache, muscle strain, arthritis?

Answer»

ACETAMINOPHEN
IBUPROFEN
aspirin
all the above

Solution :all the above
Discussion
18832.

Valence shell electron pair repulsion theory (VSEPR) provides a method for predicting the shape of molecules, based on the electron pair electrostatic repulsion.According to VSEPR model, molecules adopt geometries in which their valence electron pairs position themselves as far from each other as possible.The VSEPR model consider double and triple bonds to have slightly greater repulsive effects than single bonds because of the repulsive effect of pi electrons.how ever, the lone pair creates the maximum repulsive effect. Which of the following does not represent the isostructural pair ?

Answer»

`SF_5^-` and `IF_5`
`CIO_2F_3` and `SOF_4`
`SeF_3^-` and `XeO_3`
None

Solution :(A)both square pyramidal having `sp^3d^2` HYBRIDISATION , (B)both TRIGONAL bipyramidal having `sp^3d` hybridisation, (C )both trigonal pyramidal having `sp^3` HYBRIDSATION.
Discussion
18833.

Valence shell electron pair repulsion theory (VSEPR) provides a method for predicting the shape of molecules, based on the electron pair electrostatic repulsion.According to VSEPR model, molecules adopt geometries in which their valence electron pairs position themselves as far from each other as possible.The VSEPR model consider double and triple bonds to have slightly greater repulsive effects than single bonds because of the repulsive effect of pi electrons.how ever, the lone pair creates the maximum repulsive effect. Incorrect order about bond angles is :

Answer»

`H_2OgtH_2SgtH_2SegtH_2Te`
`C_2H_2gtC_2H_4gtCH_4gtNH_3`
`SF_6lt NH_3ltH_2OltOF_2`
`CIO_2 gt H_2Ogt H_2SgtSF_6`

Solution :(A)According to VSEPR theory, as electronegativity of central atom decreases, bond angle decreases.So bond angle of `H_2O gt H_2S gt H_2Se gt H_2Te`
(B)`C_2H_2 gtC_2H_4 gt CH_4 gt NH_3`.In `NH_3` there is bp-lp repulsion so bond angle decreases to `107^@` from `109.5^@`
`{:(SP,sp^2,sp^3,sp^3),(180^@,120^@,109.5^@,107^@):}`
( C)The correct order is `{:(SF_6lt,OF_2lt,H_2Olt,NH_3),(90^@,102^@,104.5^@,107^@):}`
(D)`CIO_2 gt H_2O gtH_2S gtSF_6`

`{:(sp^2,sp^3,---,sp^3d^2),(~~117^@,104.5^@,92^@,90^@):}`
Discussion
18834.

What is the difference between coformation and configuration in open chain molecules?

Answer»

Solution :Stereo isomers are of two types : 1) Configurational iomers 2) Conformational isomers.
Difference : Configurational isomers possess certain types of rigidity in the molecules. These molecules can be interconverted only by bond breaking and reforming new bods.
Conformation can be easily interconverted by simply rotating about `C-C` sigma bonds.
Explanation:
Configurational isomers are oftwo types : A) GEOMETRICAL isomers and B) Option isomers.
A) Geometrical isomers : This is due to hte difference in the spatial ARRANGEMENT of groups about teh doubly bonded carbon atoms in the molecules.
EXx : Cis - 2- Butene and Trans -2- Butene

B) Optical isomers : This is due to the diffent spatial arrangements of FOUR different atoms or RADICALS in the MOLECULE.
Ex : `(+)` Lactc acid (1) and `(-)` Lactic acid (2)

Conformations: As a result or rotation about single `C-C` bond, the atoms or groups of a molecule assume different spatial arrangements. These different atomic arrangements are called 'conformations.'`
Ex : Eclipsed (E) and staggered (S) conformations of ethane.
Discussion
18835.

Which of the following is a mixed acid anhydride ?

Answer»

NO
`NO_(2)`
`N_(2)O_(5)`
`N_(2)O`

ANSWER :B
Discussion
18836.

Which of the following statement(s) is (are) con-ect ?

Answer»

`HgCl_(2)` dissoloves in HOT water
`HgCl_(2)`gives HCI when treated with SULPHURIC acid
`HgCl_2` gives yellow precipitate with NaOH
gives white ppt with ammonium `HgCl_2` hydroxide

SOLUTION :Hg can not displaces `H^+` IONS from HCl
Discussion
18837.

When a radioactive substance is subjected to vacuum, the rate of disintegration per second

Answer»

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

Solution :Rate of DISINTEGRATION is not affected by ENVIRONMENTAL conditions
Discussion
18838.

What is basic difference between calcination and roasting?

Answer»

Solution :During calcination, the concentrated ore is HEATED either in the ABSENCE or in the limited supply of air. On the other HAND, roasting is carried out in EXCESS of air.
Discussion
18839.

What is the free energy change for (a) galvanic cell (b) electrolytic cell?

Answer»

Solution :(a) `DeltaG lt 0` (as REDOX REACTION is spontaneous) (b) `DeltaG GT0` (as redox reaction is non-spontaneous).
Discussion
18840.

Which of the following decarboxylates most easily:-

Answer»

`Ph-CH_(2)-COOH`
`Ph-CO-COOH`
`Ph-CO-CH_(2)-COOH`
`Ph-COOH`

SOLUTION :It's a `beta-`keto ACID.
Discussion
18841.

Which of the following statements is INCORRECT about Werner's theory ?

Answer»

Primary valence is the same THING as oxidation state.
Secondary valence is the same thing as COORDINATION number.
Primary valence are satisfied by NEUTRAL molecules.
Secondary valences are directional whereas primary valences are non-directional.

Answer :C
Discussion
18842.

Which one of the following is used to get propan-2-ol by the reaction with CH_3MgBr?

Answer»

ETHANOL
ETHANAL
ETHYL methanoate
PROPANONE

SOLUTION :Ethyl methanoate
Discussion
18843.

Which of the following mixtures can be separated by using an NH_(3) solution?

Answer»

`FE^(3+)` and `Al^(3+)`
`Al^(3+)` and `ZN^(2+)`
`SN^(2+)` and `Pb^(2+)`
`Cu^(2+)` and `Cd^(2+)`

SOLUTION :`Zn^(+2)` forming SOLUBLE complex but not `ne^(+3)`
Discussion
18844.

Which of the following is an ore of calcium ?

Answer»

EPSOM salt
Gypsum
Sylvine
Asbestos

Answer :B
Discussion
18845.

What are essential amino acids?Is glycine an essential amino acid ?

Answer»

Solution :Amino acids which the body cannot SYNTHESIZE are called essentiaI amino acids. For EXAMPLE, phenylalar valine, teucine ETC. THEREFORE, these MUST be supplied in diet.
Discussion
18846.

Which of the following Colloid possesses positive charge ?

Answer»

`Fe(OH)_(3)`
`As_(2)S_(3)`
`PT`
`AU`

Solution :`Fe(OH)_(3)`
Discussion
18847.

Write the formula and IUPAC name of aspirin. Why it should not be taken on empty stomach ?

Answer»

Solution :
It generates salicylic acid on hydrolysis. THEREFORE, it should not be TAKEN on empty STOMACH.
Discussion
18848.

Which of the following statements regarding an optically active halide is correct

Answer»

`SN^2`REACTION gives a racemic mixture
`SN^1`reaction gives a racemic mixture
` SN^2`reaction, give a product with opposite OPTICAL ROTATION of that of reactant
`SN^1` reaction gives a SINGLE stereoisomer

Answer :B
Discussion
18849.

Which of the following is not correct for D_(2)O

Answer»

BOILING POINT is HIGHER than `H_(2)O`
`D_(2)O` reacts slowly than `H_(2)O`
Viscosity is higher than `H_(2)O` at `25^(@)`
SOLUBILITY of NaCl in it is more than `H_(2)O`

ANSWER :D
Discussion
18850.

Which is a tertiary alkyl halide in the following? Explain with reasons. (a) CH_(3)-(CH_(2))_(2)-CHCl-CH_(3) (b) (CH_(3))_(3)CI (c) CH_(3)-CH_(2)-"CCl"_(2)-CH_(3) (d) (CH_(3))_(3)C-CHBr_(2)

Answer»

Solution :(b) `(CH_(3))_(3)CI` is a tertiary alkyl halide, `[{:(""CH_(3)),("|"),(CH_(3)-C-I),("|"),(""CH_(3)):}]` since I is attached to a tertiary CARBON atom which is attached to THREE carbon atoms.
Discussion