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29401.

The internal energy change for the vapourisation of one mole water at 1 atm and 100°C will be (Enthalpy of vapourization of water is 40.66 kJ

Answer»

Zero
37.56 kJ
-37.56 kJ
40.6 kJ

Answer :3
Discussion
29402.

The internal energy change in the conversion of 1.0 mole of the calcite form of CaCO_(3) to the aragonite form is +0.21 kJ. Calculate the enthalpy change when the pressure is 1.0 bar , given that the densities of the solid are 2.71 g "cm"^(-3) and 2.93 g "cm"^(-3) respectively.

Answer»


ANSWER :0.20972 KJ `"MOL"^(-1)`
Discussion
29403.

The internal energy change (DeltaU) for the reaction CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(l) is -885 kJ mol^(-1) at 298K. What is DeltaH at 398 K?

Answer»

Solution :`DELTAH = DELTAU + Deltan_(g)RT, Deltan_(g) = 1-3=2`
Discussion
29404.

The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is :

Answer»

ion-ion interaction
ion-dipole interaction
London force
hydrogen BOND.

ANSWER :D
Discussion
29405.

The intramolecular hydrogen bond is present in

Answer»

<P>phenol
o - NITROPHENOL
p - nitrophenol
p - CRESOL

Answer :B
Discussion
29406.

The intermolecular interaction for which interaction energy that is inversely proportional to the cube of distance between the molecule is

Answer»

Ion-ion interaction
Ion-dipole interaction
London forces
Dipole-dipole forces

Answer :D
Discussion
29407.

The intermolecular forces of attraction (i.e., H-bonding and van der waal's forces) exist among polar and non-polar species which effect melting point, boiling point, solubility and viscosity of covalent compounds : Q. Select the incorrect order of boiling point between the following compounds:

Answer»

`N_(2)HltCH_(3)N_(3)`
`Me_(2)SO_(4)ltH_(2)SO_(4)`
`Me_(3)BO_(3)ltB(OH)_(3)`
`BF_(3)ltBI_(2)`

Solution :`to` Boiling point of `HN_(3)gtCH_(3)N_(3)` as in hydrazoic acid `(HN_(3))` intermolecular H-bonding occurs and its BOND ENERGY is higher than weak dipole-dipole interactions present in`CH_(3)N_(3)`
`to`Boiling point of `BI_(3)` is greater than that of`BF_(3)` as molecular weight of `BI_(3)` is higherhtan that of `BF_(3)` .
`to`Due to intermolecular H-bonding in `H_(2)SO_(4)` its boiling point is higher than `Me_(2)SO_(4)`.
`to` Similarly due to intermolecular H-bonding in `B(OH)_(3)` its boiling point than that of`Me_(2)BO_(3)`.
Discussion
29408.

The intermolecular forces of attraction (i.e., H-bonding and van der waal's forces) exist among polar and non-polar species which effect melting point, boiling point, solubility and viscosity of covalent compounds : Q.The type ofmolecular forceof attraction present in the following compounds is :

Answer»

INTERMOLECULAR H-bonding
Intramolecular H-bonding
VAN DER WAAL's force
All of these

Solution :
Discussion
29409.

The intermolecular forces of attraction (i.e., H-bonding and van der waal's forces) exist among polar and non-polar species which effect melting point, boiling point, solubility and viscosity of covalent compounds : Q. Meltingand boling points of halogen increasedown the group due to

Answer»

INCREASE in London dispersion FORCES
Increase in extentof polarity
Increase in Molecular mass
Both (a) and (b)

SOLUTION :`to` Halogens are non-polar species, hence London dipersion forces ACT among them and these forces are directly propotional to molecular weight.
`to`London dispersion forces `prop`B.P and M.P in such non-polar species.
Discussion
29410.

The intermidiate formed on electrolytic reduction of nitrobenzene in "conc."H_2SO_4 is……………

Answer»

`C_6H_5NH-NHC_6H_5`
`C_6H_5-NHOH`
`C_6H_5-N=N-C_6H_5`
All of these

Answer :B
Discussion
29411.

The intermetallic compound LiAg has a cubic crystalline structure in which each Li atom has 8 nearest neighbour silver atoms and vice-versa .What is the type of unit cell ?

Answer»

Body-centred cubic
Face-centred cubic
Simple cubic for EITHER LI atoms alone or AG atoms alone
None of the above

Answer :A
Discussion
29412.

The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is

Answer»

SIMPLE CUBE
Body-CENTRED cube
Face-centred cube
None of these

Solution :In body centred cubic, each atom/ion has a coordination number of 8.
Discussion
29413.

The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have co-ordination number of eight. The crystal class is

Answer»

SIMPLE cubic
body centered cubic
FACE centered cubic
NONE of these

ANSWER :B
Discussion
29414.

The intermetallic compound LiAg crystallizes in a cubic lattice in which both Li and Ag atoms have coordination numbers of 8. To what crystal class does the unit cell belong?

Answer»


ANSWER :CUBIC STRUCTURES
Discussion
29415.

The intermediate(s) formed during the reaction C_(6)H_(5)CH_(2)COOAg+Br_(2)overset("CC"l_(4))toC_(6)H_(5)CH_(2)Br is (are) :

Answer»

`C_(6)H_(5)-CH_(2)-overset(O)overset(||)OBr`
`C_(6)H_(5)-CH_(2)-overset(O)overset(||)(overset(**)O)`
`C_(6)H_(5)-overset(.)CH_(2)`
`overset(.)Br`

ANSWER :A::B::C::D
Discussion
29416.

The intermetallic compound LiAg crystallises in cubic lattice in which both Li and Ag have co-ordination number of eight. The class of crystal is:

Answer»

SIMPLE cubic
Body CENTRED cubic
Face centred cubic
None

Answer :B
Discussion
29417.

The intermetallic compound crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is

Answer»

SIMPLE CUBE
Body-centred cube
Face-centred cube
NONE of these

ANSWER :B
Discussion
29418.

The intermediate(s) formed during the reaction C_(6)C_(5)CH_(2)COOAg+Br_(2)overset("CC"l_(4))toC_(6)H_(5)CH_(2)Br, is (are):

Answer»

`C_(6)H_(5)-CH_(2)-overset(O)overset(||)-OBR`
`C_(6)H_(5)-CH_(2)-overset(O)overset(||)-overset(**)O`
`C_(6)H_(5)-overset(**)CH_(2)`
`Boverset(**)R`

ANSWER :A::B::C::D
Discussion
29419.

The intermediate product 'X' of following synthesis is identified as :

Answer»




SOLUTION :
Discussion
29420.

The intermediate product (X) formed in the following reaction is B_(2)H_(6)+6NH_(3)rarr 3K overset("heat")rarr 2B_(3)N_(3)H_(6)+12H_(2)

Answer»

`[BH(NH_(3))_(3)]^(+)[BH_(4)]^(-)`
`[BH_(2)(NH_(3))_(4)]^(+)[BH_(4)]^(-)`
`[BH(NH_(3))_(4)]^(+)[BH_(4)]^(-)`
`[BH_(2)(NH_(3))_(2)]^(+)[BH_(4)]^(-)`

Answer :D
Discussion
29421.

The intermediate product obtained during continuous etherification process is,

Answer»

ALKYL HYDROGEN sulphite
alkyl hydrogen sulphate
alkyl sulphate
alkyl sulphite

Answer :B
Discussion
29422.

The intermediate product in Gabriel phthalimide synthesis is N-Alkylphthalimide.

Answer»


ANSWER :1
Discussion
29423.

The intermediate product in the preparation of ethylene from ethanol and sulphuric acid is :

Answer»

`C_2H_5OC_2H_5`
`C_2H_5HSO_4`
`(C_2H_5)_2SO_4`
None

Answer :B
Discussion
29424.

The intermediate product formed when NH_(3) is prepared form urea is

Answer»

Ammonium BICARBONATE
Ammonium CARBONATE
Ammonium NITRATE
Ammonium nitrite

ANSWER :2
Discussion
29425.

The intermediate product formed when ethylene glycol is treated with periodic acid is……………………. .

Answer»

SOLUTION :CYCLIC periodate ESTER
Discussion
29426.

The intermediate never formed during chain growth polymerization is

Answer»

`-OVERSET("|")UNDERSET("|")(C^(-))`
`-overset("|")underset("|")(C^(o+))`

`-overset("|")underset("|")(C^(.))`

ANSWER :C
Discussion
29427.

The intermediate 'J' in the following Witting reaction is

Answer»




SOLUTION :
Discussion
29428.

Reaction of phenol with chloroform//sodium hydroxide to give o-hydroxy benzaldehyde involves the formation of

Answer»

DICHLORO carbene
Trichloro carbene
CHLORINE atoms
Chlorine MOLECULES

Answer :A
Discussion
29429.

The intermediate formed in the electrophilic addition of HBr to propene is a

Answer»

Carbocation
Carbanion
Carbene
Free radical

Answer :A
Discussion
29430.

The intermediate during the addition of HI to propene in presence of peroxide is _____________.

Answer»

`CH_(3)-OVERSET(*)CH-CH_(2)-I`
`CH_(3)-overset(*)CH-CH_(3)`
`CH_(3)-CH_(2)-overset(*)CH_(2)`
`CH_(3)-CHI-overset(*)CH_(2)`

ANSWER :B
Discussion
29431.

The intermediate formed in the nitration of benzene is…………..

Answer»

Arenium ion
Carbanion
Oxinium ion
Nitrite ion

Answer :A
Discussion
29432.

The intermediate during the addition of HCl to propene in the presence of peroxide is :

Answer»

`CH_3oversetdotCHCH_2Cl`
`CH_3overset+CHCH_3`
`CH_3CH_2oversetdotCH_2`
`CH_3CH_2overset+CH_2`

ANSWER :B
Discussion
29433.

The intermediate during the addition of HCl to propeneis:

Answer»

`CH_3CHCH_2Cl`
`CH_2overset+CHCH_3`
`CH_3CH_2CH_2`
`CH_3CH_2overset+CH_2`

ANSWER :B
Discussion
29434.

The intermediate during the addition of HCl to propene in the presence of peroxide is:

Answer»

`CH_(3)overset(**)(C)HCH_(2)Cl`
`CH_(3)overset(+)(C)HCH_(3)`
`CH_(3)CH_(2)overset(**)(C)H_(2)`
`CH_(3)CH_(2)overset(+)(C)H_(2)`.

Solution :A secondary free radical INTERMEDIATE is FORMED only in the addition of HBR to propene in the PRESENCE of peroxide.
Discussion
29435.

The intermediate during the addition of HCl to propene in presence of peroxide is

Answer»

`CH_(3)OVERSET(**)(C)HCH_(2)Cl`
`CH_(3)overset(+)(C)HCH_(3)`
`CH_(3)CH_(2)overset(**)(C)H_(2)`
`CH_(3)CH_(2)overset(+)(C)H_(2)`

Solution :Anti-Markovnikov's addition is observed only with HBr. Therefore, with HCl, even in the PRESENCE of peroxides, REACTION occurs through a more stable carbocation intermediate, i.e., option (b) is CORRECT.
Discussion
29436.

The intermediate compound in the conversion of starch to glucose is :

Answer»

Lactose
Maltose
Fructose
Sucrose

Answer :B
Discussion
29437.

The intermediate compound formed during the hydrolysis of CH_3CN is

Answer»

`CH_(3) COOH`
`CH_(3) COONH_(4)`
`CH_(3) CONH_(2)`
`CH_(3) CH_(2) NH_(2)`

Answer :C
Discussion
29438.

The intermediate compound formation theory does not explain

Answer»

action of catalytic poison
specificity of a catalyst
the MECHANISM of heterogeneous CATALYSED REACTIONS
both (a) and (c)

Answer :D
Discussion
29439.

The intermediate compound formation theory applies to ______ reactions.

Answer»

homogeneous
heterogeneous
both (a) & (B)
NONE of the above

Answer :A
Discussion
29440.

The interionic attraction depends on interaction of

Answer»

solute-solute
solvent-solvent
the charges
molecular PROPERTIES

ANSWER :C
Discussion
29441.

The interhalogen compound having dimeric structure is

Answer»

`ClF_(3)`
`BrF_(3)`
`IF_(3)`
`ICl_(3)`

Solution :Due to GREATER ability of Cl than F to donate electrons and larer SIZE of I, `ICl_(3)` exists as a dimer
Discussion
29442.

The interhalogen which does not exist is :

Answer»

`IF_(5)`
`ClF_(3)`
`BRCL`
`I Cl_(4)`

Answer :D
Discussion
29443.

The interatomic forces of attraction present in noble gas are __________.

Answer»

DIPOLE-dipole interaction
ion-dipole interaction
induced dipole-induced dipole interaction
ion-induced dipole interaction

Answer :C
Discussion
29444.

The interatomic distances in H_2 and Cl_2 molecules are 74 and 198 pm respectively the bond length of HCl is

Answer»

272pm
136pm
124pm
248pm

Answer :B
Discussion
29445.

The interaction of acetone with methyl magnesium chloride followed by hydrolysis

Answer»

ISOBUTYL ALCOHOL
TERTIARY BUTYL alcohol
n - butyl alcohol
Sec-butyl alcohol

Answer :B
Discussion
29446.

The inter-particle forces between linear chains in nylon-6,6 are

Answer»

IONIC bonds
covalent bonds
HYDROGEN BOND
none of these

Solution :hydrogen bond
Discussion
29447.

The intensive property/properties is/are

Answer»

TEMPERATURE
PRESSURE
INTERNAL enerrgy
HET capacity

Answer :A::B
Discussion
29448.

The intensive property is:

Answer»

FREEZING point
Temperature
Refractive index
All

Answer :D
Discussion
29449.

The intemediates formed during the reaction: C_(6)H_(5)CH_(2)COOAg+Br_(2)overset(C Cl_(4))underset(Delta)rarrC_(6)H_(5)CH_(2)Br

Answer»

`C_(6)H_(5)-CH_(2)-overset(O)overset("||")C-O^(.)`<BR>`C_(6)H_(5)overset(.)CH_(2)`
`Br^(.)`

ANSWER :A::B::C
Discussion
29450.

The integrated rate equations can be determined for

Answer»

ZERO order reactions
first order reactions
second order reactions
Both (a) and (B)

Solution :The integrated rate equations are DIFFERENT for the reactions of different reaction orders. We shall DETERMINE these equations only for zero and first order chemical reactions.
Discussion