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6951.

To one molar solution of a trivalent metal salt, electrolysis was carried out and 0.667 M was the concentration remaining after electrolysis. Calculate the quantity of electricity passed.

Answer»

Solution :Given : Initial concentration of the solution
`""=1M`
The concentration REMAINING after electrolysis
`""=0.667 M`
Solution :
`therefore` The amount deposited `=1-0.667 M`
`""=0.333M`
1F = FARADAY = `3 times 0.333 M`
`""=0.999 M`
`""=1M`
`therefore` 1 Faraday current is used.
Discussion
6952.

There is a solution fo p-hydroxybenzoic acid and p-amino benzoic acid . Discuss one method by which we can separate them and slso write down the confimatory test of the functional groups present .

Answer»

Solution :For the separation of p-hydroxy benzonic acid and p-aminobenzoic acid the solutuion is TREATED with `HCL` Therseore . p-aminobezoic acid REMAINS in solution as from of ammonium salt while p-hydroxoybenzion acid is not soluble (so it is separted easily ).

Test (1) With ` NaHCO_3` both evolce effervescenes of `CO_2`.

Test (2) : Azo due test : p-Aminobenzonic acid does not .
Test (3) : Liebermann nitrosos test : p-Huydroxy BENZOIC acid gives Liebemann nitroso test , while p-amino benzoic acid does not .
Discussion
6953.

When 50 cm^(3) of a strong acid is added to 50 cm^(3) of an alkali, the temperature rises by 5^(@)C. If 250cm^(3) of each liquid are mixed, the temperature rise would be

Answer»

`5^(@)C`
`10^(@)C`
`25^(@)C`
`20^(@)C`

Solution :No DOUBT heat evolved during neutralisation of `250cm^(3)` of eacch acid and BASE is five time the heat evolved during neutralisation of `50cm^(3)` of each acid and base but the quantity if solution taking heat is also five time and thus sam temperature rise is noticed.
Discussion
6954.

What is the basis of formation of spectrochemical series ?

Answer»

Solution :It is an experimentally determined series based on the absorption of light by complexes with different ligands. In general, the ligands can be ARRANGED in a series in order of increasing FIELD STRENGTH as given below :
`I^(-)LTBR^(-)ltSCN^(-)ltCl^(-)ltS^(2-)ltF^(-)ltOH^(-)ltC_(2)O_(4)^(2-)ltH_(2)OltNCS^(-)ltEDTA^(4-)ltNH_(3)ltenltCN^(-)ltCO`
Discussion
6955.

use the following data to calculate Delta_(" lattice")H^(@) for NaBr . Delta("sub")H^(-) fpr sodium metal = 108 .4 kJmol^(-1)lonisation enthaply of sodium = 496 kJ mol^(-1) ltbr gt Electron gain enthalpy of bromine =325 kJ mol ^(-1) bond dissociation enthalpy of bromine =192 kJ mol ^(-1) Delta_(t)H^(-)for NaBr (s) = -360 .1 kJ mol ^(-1)

Answer»

`-735.5 kJ mol^(-1)`
`+735.5kJ mol ^(-1)`
`-789.89 JK^(-1)mol ^(-1)`
`+735 . 5 J mol ^(-1)`

Solution :By applying Hess's law
`Delta_(F)H^(Theta)=Delta_("sub")H^(@)+lE+Delta_(diss)H^(@)+Delta_(EQ)H^(@) +U`
`-360.1 = 108.4 + 496 + 96 +(-325)+U`
` U =+ 735.5 kJ mol^(-1)`
Discussion
6956.

To thin coat of silver on metal surface of 80cm^(2)xx5xx10^(-3)cm, how long current of 3 ampere should be passed from silver nitrate solution (Density 1.05gm" "cm^(-3)) ?

Answer»

115 SECOND
125 second
135 second
145 second

Solution :Required weight of Ag=`Vxxd`
`=80xx5xx10^(-3)xx1.05`
`W=0.45`
`THEREFORE W=(Exxixxt)/(96500)`
`therefore 0.42=(108xx3xxt)/(96500)`
`=125.09`
`therefore t~~125` second.
Discussion
6957.

Write the chemical equation for the following reaction : A primary amine is prepared from a primary alkyl halide.

Answer»


ANSWER :`""RX+NH_(3) rarr RNH_(2)+HX`
Discussion
6958.

What is the aquaregia ?

Answer»

3 parts of CONE. HQ + 1 part of cone. `HNO_3`
2 parts of cone. HCl + 2 parts of cone. `HNO_3`
1 part of cone. HCl + 3 parts of cone.` HNO_3`
None of these

Answer :A
Discussion
6959.

Which of the following statements(s) is // are correctly applicable to all the transition elements with atomic number 21-29 ? 1. Thelowest oxidation states is +1. 2.The 4s orbital is completely filled in the group state. 3.The 3d orbital is incompletelyfilled in the group state. 4. The ion in the +2 oxidation state is paramagnetic.

Answer»

1,2 and 3
3 and 4 only
4 only
3only

Solution :Lowest oxidation state is `+1` only in case of Cu. Hence, (1) is wrong.
4s orbital is not completely FILLED in Cu and Cr. Hence, (2) is wrong.
3d orbital is not incompletely filled in cae of Cu. Hence, (3) is wrong.
Ions is `+2` oxidation state of all elements ( 21-29) hav unpaired electrons and, therefore, PARAMAGNETIC. Hence, ( 4) is CORRECT.
Discussion
6960.

The type of isomerism shown by, C_(6)H_(5)C-=N and C_(6)H_(5)N-=C is :

Answer»

position
functional
enantiomerism
functional and tautomerism.

Answer :D
Discussion
6961.

The sodium carbonate beattestin which Na_(2)CO_(3) is used insteal ofborax .it issuitable to chromium and

Answer»

Mn
Cu
Fe
Ni

Answer :a
Discussion
6962.

Whatproduct is formed when 2-methylpropene is added to a large excess of benzene containing HF and the Lewis acid BF_(3)? By what mechanism is it formed?

Answer»


ANSWER :`(##MOT_CON_JEE_CHE_C05_E03_001_A01##)`
Discussion
6963.

Which one of the following is not a sulphide ore

Answer»

Magnetite
Iorn pyrites
Copper glance
Sphalerite

Solution :`{:("Magnetite",Fe_(3)O_(4)),("Iron pyrites",FeS_(2)),("Copper glance",Cu_(2)S),("Sphalrite", "Sulphife of" ZnFe):}`
Discussion
6964.

Which one of the following is a disaccharide : Starch , Meltose , Fructose, Glucose?

Answer»

Solution :Maltose is a disaccharide since it CONSISTS to two `ALPHA`-glucose UNITS.
Discussion
6965.

Write reactions with conditions for the following conversions: (i) Methyl bromide to acetic acid. (ii) Benzene to toluene.

Answer»

Solution :STEPS involved in the conversions are given below:
(i) `underset("BROMOMETHANE")(CH_(3)Br)+KCNntounderset("ETHANE NITRILE")(CH_(3)C-=N)+H_(2)Ooverset(H^(+))(to)CH_(3)-underset("Acetic acid")overset(O)overset(||)(C)-OH+NH_(3)`
Discussion
6966.

The standard enthalpies of formation of CO2(g), H_(2)O(?) and glucose(s) at 25^(@)C are -400kJ/mol, -300kJ/mol and -1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at 25^(@)C is

Answer»

`+2900kJ`
`-2900kJ`
`-16.11kJ`
`+16.11kJ`

ANSWER :C
Discussion
6967.

The vapour density of a gas is 35.5 . The volume occupied by 3.55g of the gas at N.T.P. is :

Answer»

1.12L
11.2L
22.4L
44.8L

Answer :A
Discussion
6968.

When benzaldehyde (or any other aromatic aldehyde) is heated with anhydride of an aliphatic acid (containing two alpha - hydroge atoms) in presence of its sodium salt, condensation takes place to form an unsaturated carboxylic acid. This reaction is called

Answer»

PERKIN REACTION
Claisen - SCHMIDT reaction
Witting reaction
BENZOIN condensation

Answer :A
Discussion
6969.

Which one of the following compounds will react with two mole of CH_(3)MgBr ?

Answer»

`CH_(3)COOH`
`CH_(3)-C=C-CH_(3)`
`HC-=C-CH_(2)OH`
`CH_(3)CH_(2)CH_(2)OH`

SOLUTION :`HC-=C-CH_(2)OH+underset("2 moles")(2CH_(3)MgBr)rarr`
Discussion
6970.

The weight ratio of Mg and AI deposited during the passage of same current through their molten salts:

Answer»

`12:9`
`9:12`
`6:2`
`2:3`

ANSWER :A
Discussion
6971.

Which of thefollowingis addict forming drug?

Answer»

pecicillin
Ibuprofen
AmyI metacresol
Morphine diacetate

Answer :D
Discussion
6972.

What is the predominant intermolecular force of attraction between the adjacent chains of polymer molecules in natural rubber?

Answer»

H- BONDS
dipole-dipole attraction
VAN DER WAAL's force
Ionic attraction

Answer :C
Discussion
6973.

Which of the following test is positive to acetone

Answer»

Tollen'stest
Benedict's TEST
LODOFORM test
FEHLING's test

ANSWER :C
Discussion
6974.

Which of the following products is formed on boiling tin with an alkali solution

Answer»

`Sn(OH)_(2)`
`Sn(OH)_(4)`
`SnO_(3)^(2-)`
`SnO_(2)`

ANSWER :C
Discussion
6975.

What is cementation ?

Answer»

SOLUTION :Gold can be recovered by reaching the deoxygenated leached solution with zinc.In this PROCESS the gold is reduced to its elemental state(zero ocidation sate) and the process is called cemetation `Zn_((s))+2[AU(CN)_(2)]_((aq))^(-)to[Zn(CN)_(4)]_((aq))^(-)+2Au_(s)`
Discussion
6976.

Which colour is obtained when an ammonia solution is added to a solution of copper salt?

Answer»

SOLUTION :DEEP BLUE
Discussion
6977.

Which of the following gives maximum energy in metabolic process

Answer»

Proteins
Carbohydrates
Vitamins
Fats

Answer :D
Discussion
6978.

underset"(excess)"(CH_3-CH_3) underset"hv"overset(Cl_2)to A underset"dry ether"overset"Na"to B undersetDeltaoverset(AlCl_3 +HCl)toC Identify C: -

Answer»




SOLUTION :
Discussion
6979.

Which one of the following shows isotopes?

Answer»

NITROGEN
Arsenic
Antimony
Bismuth

Solution :Nitrogen
Discussion
6980.

Write Williamson's synthesis reaction.

Answer»

Solution :`CH_(3)-Cl+CH_(3)O^(-)NA^(+) underset(DELTA)overset("Dry ether")to CH_(3)-O-CH_(3)+NACL`
Discussion
6981.

Which of the following statements is incorrect with respect to physisorption?

Answer»

The forces involved are van der Waal's forces
More EASILY liquefiable GASES are adsorbed easily
Under high pressure it RESULTS into Multi-molecular LAYER on adsorbent surface.
`DeltaH_(adsorption)` is high and positive

Answer :D
Discussion
6982.

When 0.1 mol of CoCl_(3)(NH_(3))_(5) is treated with excess of AgNO_(3), 0.2 mol ofAgcl is obtained. The conductivity of solution will correspond to

Answer»

1:3 electroylte
1:2 electroyle
1:1 electrolyte
3:1 electrolyte

Solution :0.2 mol of Agcl is obtained when 0.1 mol of `CoCl_(3)(NH_(3))_(5)` is treatd with EXCESS of `AgNO_(3)` which SHOWS that one MOLECULE of the complex gives two `Cl^(-)` ions in solution. THUS the formula of the complex is `[Co(NH_(3))_(5)Cl]Cl_(2)` i.e. 1:2 electrolyge.
Discussion
6983.

What is the maximum oxidation state of a d-block element ?

Answer»

SOLUTION :The maximum oxidation STATE of a d-block element is the TOTAL number of ELECTRONS present in both ns and (n-1)d SUBSHELLS.
Discussion
6984.

Which oxide of nitrogen becomes brown when released in air ?

Answer»

SOLUTION :NITRIC OXIDE
Discussion
6985.

The standard state Gibbs free energies of formation of C (Graphite) and C(diamond) at T = 298 K are Delta_(f)G^(@)["C(graphite)"]=0kJmol^(-1) Delta_(f)G^(@)["C(diamond)"]=2.9kJmol^(-1) The standard state means that the pressure should be 1 bar, and substance should be pure at a given temperature. The conversion of graphite [C(graphite)] to diamond [C(diamond)] reduces its volume by 2xx10^(-6)m^(3)mol^(-1). If C(graphite) is converted to C(diamond) isothermally at T = 298 K, the pressure at which C(graphite) is in equilibrium with C(diamond), is [Use information : 1 J = 1kgm^(2)s^(-2),1Pa=1kgm^(-1)s^(-2),1"bar"=10^(5)Pa]

Answer»

29001 bar
58001 bar
14501 bar
1450 bar

Answer :C
Discussion
6986.

Which single reagent can be used in the following conversions?

Answer»

a.`H_(2)+`Poisoned Pd
b.`H_(2)+`RANEY Ni
c.`H_(2)+Pd+C`
d.`H_(2)+Ni+B`

Solution :`H_(2)+Pd+C` (CHARCOAL) selectively reduces `(C-=C)` to `(C=C)` bond, benzyl alcohol to toluene, azides to AMINES, and `(-NO_(2))` to `(-NH_(2))` group. So the ANSWER is `(c )`.
Discussion
6987.

Which of the following is true for order of a reaction?

Answer»

It is eqaul to the sum of EXPONENTS of the MOLAR concentration of the reactants in the rate equation
It is always a whole NUMBER
It is never zero
It can be determined theoretically

Solution :By DEFINITION of order of reaction.
Discussion
6988.

When acetic acid reacts with ketone , the product formed is :

Answer»

aceto -ACETIC acid
acetone
Acetic ANHYDRIDE
ethyl acetate.

Solution :`CH_(3)COOH` reacts with KETONE to FORM acetic anhydride.
Discussion
6989.

X=5Å Y=8Å Molar mass of solid ="259.8 g mol"^(-1) A solid crystallises in hexagonal lattice as shown in above figure. Density of the solid is 5g/ml. How many molecules are their in the given unit cell? ("Avagadro's number "=6.023xx10^(23))

Answer»

2
3
4
6

Answer :A
Discussion
6990.

Which of the following is most easily hydrolysed with aqueous KOH solution ?

Answer»

`CH_3Cl`
`C_6H_5CH_2Cl`
`CH_2=CHCl`
`C_6H_5-UNDERSET(CL)underset(|)(CH)-CH_3`

ANSWER :D
Discussion
6991.

Which one of the following undergoes reaction with 50% sodium hydroxide solution to गिव the corresponding alcohol and acid

Answer»

Phenylmethanal
ethanal
ETHANOL
METHANOL

SOLUTION :Phenylmethanal
Discussion
6992.

Which polymer manufactured by condensation polymerization is

Answer»

POLYESTER
POLYSTYRENE
polyethylene PROPYLENE
Polyvinyl CHLORIDE

SOLUTION :Polyester is manufactured by condensation polymerization, but polystyrene, polyethylene propylene and polyvinyl chloride are manufactured by addition polymerization.
Discussion
6993.

Which has maximum paramagnetic nature ?

Answer»

`[Cu(H_(2)O)_(4)]^(2+)`
`[Cu(NH_(3))_(4)]^(2+)`
`[Mn(H_(2)O)_(6)]^(2+)`
`[Fe(CN)_(6)]^(4-)`

Solution :(i) `[Cu(H_(2)O)_(4)]^(+2)Cu^(+2)= 3D^(9)`No. of unpaired
`e^(-)=1`
(ii) `[Cu(NH_(3))_(4)]^(+2) Cu^(+2)=3d^(9)`

No. of unpaired ELECTRON =1
(iii) `Mn^(+2)=3d^(5) 4s^(0)` No. of unpaired `e^(-)=5`
(iv) `Fe^(+2)= 3d^(6)`

No. of unpaired electron =0
Discussion
6994.

Which of the following is used to attain very low temperature during cryoscopic studies?

Answer»

Ar
He
Ne
Kr

Answer :B
Discussion
6995.

Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyls, polystyrene.

Answer»

SOLUTION :Polythene, POLYVINYLS and polystyrene. They are called THERMOPLASTIC polymers.
Discussion
6996.

When HCl is passed over one mole of K_(2) Cr_(2) O_(7) , the no. of moles of Cl_(2) formed is "_____________".

Answer»


Solution :`K_(2)Cr_(2) O_(7) + 14 HCl rarr 2KCL + 2CrCl_(3) + 7 H_(2)O + 3Cl_(2)`
Discussion
6997.

Which of the following is basic dye?

Answer»

ALIZARINE
Aniline YELLOW
Orange - 1
MARTIUS yellow

Solution :Aniline yellow is a basic dye.
Discussion
6998.

What are the reagents used in Hofmann reaction? What is the organic product ?

Answer»

Solution :Reagents : ACID amide, `Br_2, KOH `
Organic PRODUCT : Primary AMINE having one carbon atom less than the parent amide.
Discussion
6999.

When HCl reacts with powdered iron, ferrous chloride is formed, but not ferric chloride. Why?

Answer»

Solution :Reasction of IRON with hydrochloric acid produces FERROUS chloride and liberate hydrogen.
`Fe+2HCl toFeCl_(2)+H_(2)`
This LIBERATED hydrogen prevents the FORMATION of ferric chloride .
Discussion
7000.

What is self-reduction in metallurgy? Give example.

Answer»

Solution :Self reduction (Auto-reduction) : During the process of roasting , the sulphides of same metals like Cu, Pb nd Hg are partly converted into corresponding oxides . These metal oxides reduce the REMAINIG metal sulphides into corresponding metals . This process of reduction is CALLED self redution .
In case of copper pyrite or copper GLANCE,
`2Cu_2S + 3O_2 RARR 2Cu_2O + 2SO_2` ,
`2Cu_2O + Cu_2SoversetDeltararr6Cu + SO_2` ,
In case of lead from galena ,
`2PbS + 3O_2 rarr 2PbO + 2SO_2`
PbS + 2PbO `rarr` 3Pb +` SO_2`
Discussion