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7551.

Which of the following is least volatile ?

Answer»

`H_(2)O`
`H_(2)S`
`H_(2)SE`
`H_(2)TE`

ANSWER :A
Discussion
7552.

Which type of amines are prepared by Gabriel phthalimide reaction?

Answer»

SOLUTION :PRIMARY ALIPHATIC AMINES and aralkyl amines.
Discussion
7553.

Which vitamin is not obtained from plants ?

Answer»

THIAMINE
Cyanocobalamine
Pyridoxine
`ALPHA` -Tocopherol

SOLUTION :Cyanocobalamine
Discussion
7554.

Which of the following halides is least statbled and has doubtful existence?

Answer»

`Cl_(4)`
`Gel_(4)`
`Snl_(4)`
`PbI_(4)`

SOLUTION :`Pbl_(4)` is least stable because of two reasons
(1) SIZE of iodine is biggest
(2) oxidation state of `PB` is more statble than state because of inert pair effect.
Discussion
7555.

Which metal forms an amphoteric oxide ?

Answer»

Cr
Fe
Cu
Zn

Answer :D
Discussion
7556.

Which of the following pairs of ions would be expected to form precipitate when dilute solutions are mixed?

Answer»

`NA^(+),SO_(4)^(2-)`
`NH_(4)^(+),CO_(3)^(2-)`
`Na^(+),S^(2-)`
`FE^(3+),OH^(-)`

SOLUTION :`Na_(2)SO_(4),(NH_(4))_(2)CO_(3)` and `Na_(2)S` are soluble in water, while `Fe(OH)_(3)` is insoluble in water.
Discussion
7557.

Which one of the following does not show optical activity ?

Answer»




SOLUTION :Compound (c) shows optical INACTIVITY as a PLANE of symmetry is PRESENT in this compound.
Discussion
7558.

Write the IUPAC names of the following co-ordination compounds ?

Answer»

Solution :(i) `[Pt(NH_(3))_(2)Cl(NO_(2))]` <BR> Diamminechloridonitrito - N-platinum(II)
(ii) `K_(5)[Cr(C_(2)O_(4))_(3)]`
Potassium trioxalatochromate (III)
(iv) `[Co(NH_(3))_(5)(CO_(3))]Cl`
Tetraamminecarbonatocobalt (III) chloride
(v) `[Co(NH_(3))_(4)(H_(2)O)Cl]Cl_(2)`
Tetraammineaquachlorideocobalt(III) chloride
(vi) `[CoCl_(2)(en)_(2)]^(+)`
Dichloidobis-(ethane-1,2-diamine)cobalt (III) ion.
(vii) `[Ni(CO)_(4)]`
tetracarbonylnickel(o) (III) ion
(viii) `[TI(H_(2)O)_(6)]^(3+)`
Hexaaquatitanium (III) ion
(ix) `[Co(NH_(3))_(5)Br]SO_(4)`
Pentaaminebromidocobalt (III) sulphate
(x) `[Cr(NH_(3))_(3)(H_(2)O)_(3)]Cl_(3)`
Triamminetriaquachromium(III) chloride
(xi) `[CoCl_(2)(NH_(3))_(4)]Cl`
Tetraamminedichloridocobalt (III) chloride
(xii) `[Co(en)_(3)]Cl_(3)`
TRIS(ethane-1, 2-diamine)cobalt(III) chloride
(xiii) `[Pt(NH_(3))_(5)Cl]Br`
Pentamminechloridoplatinum (II) bromide
(xiv) `K_(2)[Zn(OH)_(4)]`
Potassium tetrahydraxidozincate (II).
Discussion
7559.

Which one of the following is most reactive towaresunimolecular nucleophilic substituion reaction ?

Answer»

`CH_(2)=CH-CL`

`CH_(3)-CH=CH-Cl`
`CH_(2)=CH=CH_(2)-Cl`

Solution :Compounds which produess most STABLE CARBOCATION is more reactive in UNIMOLECULAR nucleophilic substituition reaction. Allyl chloride producesmost stable carbocation .
Discussion
7560.

Write the monomers used for getting the following polymers: Bakelite

Answer»

SOLUTION :PHENOL, `C_6H_5OH` and FORMALDEHYDE, HCHO
Discussion
7561.

The role of catalyst is to change:

Answer»

GIBBS ENERGY of REACTION
enthalpy of reaction
activation energy of reaction.
EQUILIBRIUM constant.

Answer :C
Discussion
7562.

When Cl_(2) gas is passed through hot and conc. Solution of KOH, following compound is formed :

Answer»

KCl
`KClO_(3)`
`KClO_(2)`
`KClO_(4)`

Solution :`6KOH + 3Cl_(2) RARR 5KCl + KClO_(3) + 3H_(2)O`
Discussion
7563.

Which plastic is obtained from CHCl_(3) as follows ? CHCl_(3)underset(SbF_(5))overset(HF)toXoverset(800^(@))toYoverset("Polymerization")to plastic

Answer»

BAKELITE
TEFLON
Polythene
Perspex

ANSWER :2
Discussion
7564.

The vapour pressure of benzene at 80^(@)C is lowered by 10mm by dissoving 2gof a non-volatile substance in 78g of benzene The vapour pressure of benzene at 80^@C is 750 mm. The molecular weight of the substance will be:

Answer»

15
150
1500
148

Answer :D
Discussion
7565.

What is chemical name og aspirin ?

Answer»

SOLUTION :2 - acetony BENZOIC ACID .
Discussion
7566.

Which halide among the following is used as methylating agent ?

Answer»

`CH_(3)I`<BR>`C_(2)H_(5)Cl`
`C_(2)H_(5)Br`
`C_(6)H_(5)Cl`

Solution :`CH_(3)I` is used as methylating agent.
Discussion
7567.

Which of the following substances will not react with PCl_5:

Answer»

METHYL alcohol
Acetic acid
Acetaldehyde
Ethane

Answer :D
Discussion
7568.

Which of the following compounds will take part in nucloephilic addition reaction most readily ?

Answer»

`CH_3COCH_3`
`CH_3CHO`
`C_6H_5CHO`
`C_6H_5COC_6H_5`

ANSWER :D
Discussion
7569.

Which among the following factors is the most imortant in making fluorine the strongest oxidising halogen ?

Answer»

Eelctron affinity
Bond DISSOCIATION energy
Hydration enthalpy
Ionisation enthalpy

Answer :B
Discussion
7570.

What reagent is used for converting a amide into an amine with the same number of carbon atoms?

Answer»

SOLUTION :`LiAIH_4`
`UNDERSET("ETHANAMIDE")(CH_3 CONH_2 ) + 4H OVERSET(LiAIH_4)to underset("Ethpanamine ")(CH_3 CH_2NH_2+H_2 O)`
Discussion
7571.

Which of the following has been arranged in order of increasing bond strength ?

Answer»

`Zn_2^(2+) LT Hg_2^(2+) lt Cd_2^(2+)`
`Cd_2^(2+) lt Hg_2^(2+) lt Zn_2^(2+)`
`Zn_2^(2+) lt Cd_2^(2+) lt Hg_2^(2+)`
`Hg_2^(2+) lt Cd_2^(2+) lt Zn_2^(2+)`

Solution :Due to poor shielding of 4f ELECTRONS, bond STRENGTH is maximum for `HG^(+)-Hg^(+)`.
Discussion
7572.

Which of the following diagrams shows correct change in the polarity of bond ?

Answer»




ANSWER :D
Discussion
7573.

Which one of the following is a covalent hydride ?

Answer»

`NAH`
`CaH_(2)`
`BrH_(2)`
`AsH_(3)`

Answer :D
Discussion
7574.

Which metal dissolves in NaOH with the evolution of H_2 ?

Answer»

Be
Ca
Mg
Sr

Answer :A
Discussion
7575.

Which compound exhibits maximum dipole moment among the following:-

Answer»




ANSWER :C
Discussion
7576.

Which product will be obtained in the following reaction? Reaction: P_(4)(s) + 3NaOH(aq) + 3H_(2)O_(l) to

Answer»

`PH_(3)(G) + 3Na_(2)HPO_(2)` (aq)
`PH_(3)(aq) + 3NaH_(2)PO_(2)` (aq)
`2PH_(3)(g) + 3Na_(2)HPO_(2)` (aq)
`2PH_(3)(g) + 3NaH_(2)PO_(2)` (aq)

Answer :B
Discussion
7577.

Which of the following properites is true for tooth paste ?

Answer»

it is acidic
it is neutral
it is basic
it is MADE up of CALCIUM phosphate the material of tooth enamel

Solution :Properites of tooth paste is basic tooth paste is a paste USED as an accessroty to clean and maintain health of TEETH
Discussion
7578.

The thermodynamic property that measuers the extent of molecular disorder is called entropy. The direction of a spontaneous process for which the energy is constant is always the one that increases the molecular disorder. Entropy change of phase transformation can be calculated using Trouton's furmula (DeltaS=(DeltaH)/(T)). In the reversible adiabatic process, however, DeltaS will be zero. The rise in temperature in isobaric and isochoric conditions is found to increase the randomness or entropy of the system. Q. DeltaS=2.303C" log "(T_(1)//T_(2)) C=C_(P) or C_(V). Q. The melting point of a solid is 300 K and its latent heat of fusion is 600 cal mol^(-1). the entropy change for the fusion of 1 mole of the solid (in cal K^(-1)) at the same temperature would be

Answer»

200
2
0.2
20

Answer :B
Discussion
7579.

The thermodynamic property that measuers the extent of molecular disorder is called entropy. The direction of a spontaneous process for which the energy is constant is always the one that increases the molecular disorder. Entropy change of phase transformation can be calculated using Trouton's furmula (DeltaS=(DeltaH)/(T)). In the reversible adiabatic process, however, DeltaS will be zero. The rise in temperature in isobaric and isochoric conditions is found to increase the randomness or entropy of the system. Q. DeltaS=2.303C" log "(T_(1)//T_(2)) C=C_(P) or C_(V). Q. If water in an insulated vessel at -10^(@)C, suddenly freezes, the entropy change of the system will be:

Answer»

`+10JK^(-1)MOL^(-1)`
`-10JK^(-1)mol^(-1)`
zero
equal to that of surroundings.

Answer :C
Discussion
7580.

Which among the following is a catalyst for the preparation of Grignard reagent ?

Answer»

IODINE POWDER
Iron powder
ACTIVATED charcoal
Manganese dioxide

Solution :N//A
Discussion
7581.

Which of the following is a major tranquilizer?

Answer»

diazepam
valium
CLOZAPINE
alprazolm

Solution : clozapine
Discussion
7582.

Whenwatervapours are passedoveraluminium carbide , weget :

Answer»

ACETALDEHYDE
ethylene
methane
methylalcohol

Answer :C
Discussion
7583.

The V.P. in mm Hg of an aqueous solution obtained by adding 18 g of glucose to 180 gof water at 100^(@)C is

Answer»

<P>`7.60`
`76.0`
759
752.4

Solution :`(p_(1)^(o)-p)/p_(1)^(o)=1 - p/p_(1)^(o) = (W_(2) xx M_(1))/(M_(2) xx W_(1))= (180 xx 18)/(180 xx 180)=1/100` `:. p/760 = 1 - 0.01 = 9.99`
`p=9.99 xx 760 = 752.4 mm`
`(p_(1)^(o) = V.P. "of water at " 100^(@)C = 760 mm)`
Discussion
7584.

Which of the following is least stable ?

Answer»

`PF_(5)`
`NCl_(3)`
`PCl_(3)`
`BiF_(3)`

Answer :B
Discussion
7585.

Which of the two is more stable- K_(4)[Fe(CN)_(6)] or K_(3)[Fe(CN)_(6)]

Answer»

Solution : `K_(4)[FE(CN)_(6)]` because Fe has `d^(6)` configuration in this case.
Discussion
7586.

What happens when?(a) Red lead is treated with nitric acid. . . (b) NaOH solution is added to SnCl_(2) solution.(c) Silica is heated with CaF_(2) and conc. H_(2)SO_(4)

Answer»

Solution : (a) `Pb_(3)O_(4)to2PbO+PbO_(2)`
`( [PbO + 2HNO_(3)to PB(NO_(3))_(2) +H_(2)O]xx2)/(Pb_(3)O_(4) + 4HNO_(3)to2Pb(NO_(3))_(2) +PbO_(2) +2H_(2)O)`
(b)` SnCl_(2) + 2NaOHto Sn(OH)_(2)+2NaCI`
`(Sn(OH)_(2) +2NaOHtoNa_(2)SnO_(2) +2H_(2)O)/(SnCl_(2) + 4NaOHtoSn(OH)_(2)+2NaCI)`
(c) `[CaF_(2)+H_(2)SO_(4)toCaSO_(4)+2HF]xx2`
`(SIO_(2)+4HFtoSIF_(4)+2H_(2)O)/(2CaF_(2) +SiO_(2)+2H_(2)to2CaSO_(4)+SIF_(4)+2H_(2)O)`
Discussion
7587.

What is wurts-Fittirg reaction ? Give general equation.

Answer»

Solution :When chlorobenzene is HEATED with CHLOROMETHANE in presence of SODIUM in dry ether, METHYL benzene (toluene) is formed.
Discussion
7588.

Why anhydrous salts like NaCl or CaCl_(2) are used to clear snow from roads on hills ?

Answer»

SOLUTION :They DEPRESS FREEZING POINT of WATER.
Discussion
7589.

The unit of rate constant for a zero order reaction is__________

Answer»

`sec^-1`
`MOLE lit^-1sec^-1`
`mole^-1litsec^-1`
`mole^-1lit^-1sec^-1`

ANSWER :B
Discussion
7590.

The r.m.s. velocity of molecules of a gas of density 4kg //m^(3) and pressure 1.2 xx 10^(5) N//m^(2)is

Answer»

`900ms^(-1)`
`120ms^(-1)`
`600ms^(-1)`
`300 ms^(-1)`

Solution :The r.m.s VELOCITY of a GAS `=sqrt((3P)/d)`
given `P=1.2xx10^(5)Nm^(-2)`
`d=4kgm^(-3)`
`:.v_(RMS)=sqrt((3xx1.2xx10^(5))/4)=sqrt(0.9xx10^(5))`
`=sqrt(9xx10^(4))=3XX10^(2)`
`=300ms^(-1)`
Discussion
7591.

Which halogen compound in each of the following pairs will react faster in S_(N)2reaction : (i) CH_(3)Br " or " CH_(3) I "" (ii) (CH_(3))_(3) C - Cl " or " CH_(3) - Cl

Answer»

Solution :(i)`CH_(3)I`will REACT faster than `CH_(3)Br " in " S_(N)2`reaction because `I^(-)`is a better leaving group.
(ii)`CH_(3)CL`will react faster than `(CH_(3))_(3)C Cl `because the nucleophile will not face STERIC heindrace with `CH_(3)Cl`.
Discussion
7592.

The value of molar conductivity of HCl is greater than that of NaCl at a particular temperature because :

Answer»

MOLECULAR mass of HCL is less than that of NaCl
Velocity of `H^(+)` IONS is more than that of `Na^(+)` ions
HCl is strongly acidic
Ionization of HCl is greater than that of NaCl

Answer :B
Discussion
7593.

What happens when sulphur dioxide is passed through an aqueous solution of Fe(III) salt ?

Answer»

Solution :`SO_(2)` acts as a reducing agent and hence REDUCES an AQUEOUS solution of Fe(III) salt to Fe(II) salt.
`{:(SO_(2)+ 2H_(2)O rarr SO_(4)^(2-) + 4H^(+) + 2e^(-)),(2 Fe^(3+)+2 e^(-) rarr 2 Fe^(2+)),(bar(2Fe^(3+)+SO_(2)2H(2)O rarr 2 Fe^(2+)+SO_(4)^(2-)+4H^(+))):}`
Discussion
7594.

The relative rates of diffusion of U^(235)F_6 and U^(238)F_6 are

Answer»

1.6
1.2
1.4
1.0043

Answer :D
Discussion
7595.

Write name and structure of monomers of following polymer : Polystyrene

Answer»

SOLUTION :STYRENE
Discussion
7596.

Write thenumber of given reagents which can be used to differentiate the pair of following compounds in OMR sheet. (a) 2-gexyne and 3 hexyne (b) 2-pentanol and 3-pentanol (c ) 4-methyl aniline and N-methyl aniline (d) Phenol and cyclo hexanol (1) ZnHg//HCl""(2) ZnCl_(2)//HCl (3) aq.AgNO_(3)""(4)NaOI (5) NaNH_(2),/_\""(6) elc.AgNO_(3) (7) N_(2)H_(4)//H_(2)O_(2)"" (8) CHCl_(3)//KOH,/_\ [Hint : If differentiation of (a) can be done by reagent 1, (b) by 2, (c ) by 3 and (d) by 4, then write 1234 in OMR sheet.]

Answer»


SOLUTION :N//A
Discussion
7597.

Which of the two H_2O or H_2Shas higher boiling point ? Explain.

Answer»

Solution :`H_2O`has higher BOILING point than `H_2 S` . In `H_2O` , hydrogen is bonded to electronegative element oxygen and, therefore, it can form hydrogen bonds. As a result, water exists as associated molecules and therefore, exists as a liquid

On the other hand, `H_2 S`has NEGLIGIBLE tendency to form hydrogen bonding because of low electronegativity of S. The molecules are, therefore, held up by only van dar Waals. forces. Therefore, it exists as GAS. Thus, water has higher boiling point than `H_2S` .
Discussion
7598.

Which of the following statement is not true.

Answer»

The `hat(OXO)` angle in `CO_(2)` is greater than that in `SO_(2)`.
The `CH_(2)F_(2)` molecule MAY be polar or nonpolar depends UPON its geometry.
Ortho-Chlorophenol is having intramolecular H-bonding
`Ba^(2+)` is larger in size COMPARED to `Be^(2+)`

Solution :
Discussion
7599.

What will be the electrode potential for the given half cell reaction at pH=5 ? 2H_(2)O to O_(2)+4H^(+)+4e^(-),E^(@)=-1.23V (R=8.314" J "mol^(-1)K^(-1), temp.=298 K, oxygen under std. atm. Pressure of 1 bar.)

Answer»


Solution :`2H_(2)O to O_(2) + 4H^(+)+4E^(-),E^(@)=-1.23V`
`therefore E=+1.23-(0.0591)/(4)log[H^(+)]^(4)`
`=+1.23+(0.0591xxpH)`
`=+1.23+0.0591xx5implies1.23+0.2955`
`+1.5255V`
Discussion
7600.

What is the approximate diameter of colloidal particles ?

Answer»

SOLUTION :1-1000 NM.
Discussion