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12701.

x and y moles/litre of A and B respectively were allowed to react A+2BhArr1/2C. At equilibrium, the concentrations of A, B and C were found to be 4, 2 and 2 moles/litre respectively, x and y are

Answer»

6 & 4
8 & 10
6 & 10
8 & 4

Answer :B
Discussion
12702.

Wrought iron, pig iron and steel differ in properties due to

Answer»

CARBON content
malleability
conductivity
softness

Solution :They CONTAIN DIFFERENT PERCENTAGE of carbon
Discussion
12703.

Two carboxylic acid groups are attached to benzene at ortho positions. What is the common name of the compound obtained ?

Answer»

SOLUTION :PHTHALIC
Discussion
12704.

The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0125. The molaliry of the solution is

Answer»

`0.70`
`0.50`
`0.60`
`0.80`

Solution :Relative LOWERING of vapour pressure of an aqueous solution CONTAINING nonvolatile solute is EQUAL to mole fraction of solute.
`THEREFORE (P^(@)-P_(s))/(P^(@))=(n)/(n+N)=0.0125`
`rArr (n+N)/(n)=(1)/(0.0125)rArr (N)/(n)=(1)/(0.0125)-1=(0.9875)/(0.0125)`
`therefore (N)/(n)=(0.9875)/(0.0125)`
Now, MOLALITY `=(0.0125xx1000)/(0.9875xx18)=0.70`.
Discussion
12705.

Which of the following is oxidant:

Answer»

HCl
HOCl
HI
HBr

Answer :B
Discussion
12706.

What is B in 3R-OH+PX_(3)to 3R-X+B ?

Answer»

Meta PHOSPHORIC acid
PHOSPHOROUS acid
Pyro phosphorous acid
Phosphoric acid

ANSWER :B
Discussion
12707.

Which of the following is incorrect regarding the first law of thermodynamics ?

Answer»

It is not applicable to any cyclic process
It is a RESTATEMENT of the principle of CONSERVA- tion of energy
It INTRODUCES the CONCEPT of the INTERNAL energy
It introduces the concept of the entropy

Answer :A
Discussion
12708.

Which of the following statement are incorrect about this molecule?

Answer»

`C_(1)-C_(2)` and `C_(3)-C_(4)` bond are of same LENGTH
`C_(1)-C_(2)` bond is shorter than `C_(3)-C_(4)` bond
`C_(1)-C_(2)` bond is longer than `C_(3)-C_(4)` bond
`C_(1)-C_(2)` and is `C_(2)-C_(3)` bonds are of same length

Solution :N/A
Discussion
12709.

What is the nature of graph of mole fraction of gaseous solute and its partial pressure ?

Answer»

STRAIGHT LINE
Perabola
ZIGZAG line
NONE of these

ANSWER :A
Discussion
12710.

Which vitamin is water soluble ?

Answer»

Vitamin-E
Vitamin-K
Vitamin-A
Vitamin-B

Solution :Vitamin-B
Discussion
12711.

When ethylene is bubbled through an aqueous solution of bromine containing sodium chloride, the product/s formed is/are

Answer»

1,2-dibromoethane
1-bromo-2-chloroethane
2-bromoethanol
all of the above

Solution :1,2-Dibromethane , 2-bromo-1-chloroethane and 2-bromoethanol all are FORMED .
Discussion
12712.

XeF_(2) molecule is

Answer»

Square PLANER
Trigonal bipyraidal
Trigonal planer
Linear

SOLUTION :`XeF_(2)` has `SP^(3)d-`hybridization with linear shape
Discussion
12713.

Which one of the following will most readily be dehydrated in acidic condition?

Answer»




Solution :Greater the CONJUGATION, greater the stability and hence, easier the DEHYDRATION. THUS, in acidic CONDITION (a) will most readily be dehydrated.
Discussion
12714.

Write the formula of the following coordination compound Dichloridobis(ethane-1,2-diamine)platinum(IV)nitrate

Answer»

SOLUTION :`[PtCl_2(EN)_2](NO_3)_2` Or `[PtCl_2(H_2N CH_2 NH_2)_2](NO_3)_2`
Discussion
12715.

Which is the correct order of ionic sizes ? At. Nos.Ce= 58, Sn=50 ,Yb=70 and Lu=71)

Answer»

`CE gt SN gt Yb gt LU`
`Sn gt Ce gt Lu gt Yb`
`Lu gt Yb gt Sn gt Ce`
`Sn gt Yb gt Ce gt Lu`

Solution :is THECORRECT answer.
Discussion
12716.

What will happen during the electrolysis of aqueous solution of CuSO_(4) in thee presence of Cu electrodes?

Answer»

COPPER will DEPOSIT at cathode.
Copper will DISSOLVE at anode.
Oxygen will be RELEASED at anode.
Copper will deposit at anode.

Answer :A::B
Discussion
12717.

Which of the following pairs of ions when mixed in dilute solutions may be precipitate

Answer»

`Na^(+),SO_(4)^(2-)`
`NH_(4)^(+),CO_(3)^(2-)`
`Na^(+),S^(2-)`
`Fe^(3+),PO_(4)^(3-)`

SOLUTION :`Fe_(3)(PO_(4))_2` is INSOLUBLE in water.
Discussion
12718.

Which of the following will be diamagnetic ?

Answer»

`Cu^(2+)`
`Ni^(2+)`
`Cd^(2+)`
`TI^(3+)`

ANSWER :C
Discussion
12719.

Two Daniel cells were set up one with 1 M ZnSO_(4) and1 MCuSO_(4) , the other with 2 M ZnSO_(4) and 2 M CuSO_(4) . Their emf's are E_(1) and E_(2) respectively . Then

Answer»

`E_(1) = 2 E_(2)`
`E_(2) = 2 E_(1)`
`E_(2) = 4 E_(1)`
`E_(1) = E_(2)`

Solution :As the factor `[ZN^(2+)]// [CU^(2+)]` remains same , `E_(1) = E_(2)`
Discussion
12720.

Which of the following can give aldehyde by the oxidation with Jones reagent?

Answer»


`CH_(2)=CH-CH_(2)OH`
`H_(3)C-UNDERSET(CH_(2)) underset(|) OVERSET(CH_(3)) overset(|)(C)-CH_(2)OH`

Solution :`A,B,D` because hydrate in unstable, `'C'` due to steric factor.
Discussion
12721.

Which of the following graphs is correct for a zero order reaction ?

Answer»




Solution :Out of (a) and ( c ), (a) is correct because in zero order reaction, RATE remains constant with time and FALLS to zero when WHOLE of reactant has reacted. Out of (b) and (d), (d) is correct.
Discussion
12722.

Which hydride possesses the maximum complex forming nature ?

Answer»

`NH_3`
`PH_3`
`BiH_3`
`SbH_3`

ANSWER :A
Discussion
12723.

Which of the following is a biodegradable polymer ?

Answer»

POLYTHENE
BAKELITE
PHBV
PVC

Answer :C
Discussion
12724.

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

Answer»

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

Solution :`C_(6)H_(12)O_(6) (s)+6O_(2)(g) rarr 6CO_(2)(g) +6H_(2)O(l)`
`DeltaH_("comb. "C_(6)H_(12)O_(6))^(@)=6 DeltaH_(f CO_(2))^(@)+6DeltaH_(f H_(2)O(l))^(@)-DeltaH_(f C_(6)H_(12)O_(6)(s))^(@)`
`=6XX(-400)+6 xx(-300) -(-1300)`
`=-2900" kJ/mol"`
`:.` Stadard enthalpy of combustion PER gram of glucose `=(-2900)/180=-16.11 kJ`
Discussion
12725.

Which of the following combination is CORRECT ?

Answer»

<P>(I) (II) ( R )
(II) (ii) (S)
(III) (i) (P)
(IV) (ii) ( R )

Answer :A
Discussion
12726.

Which of the following combination is CORRECT ?

Answer»

(II) (i) (S)
(II) (III) (Q)
(III) (iii) (Q)
(III) (i) (Q)

ANSWER :A
Discussion
12727.

When acetaldehyde undergoes reaction with Zn-HCl in the presence of Hg, The product obtained is

Answer»

Propane
ethane
methane
butane

ANSWER :B
Discussion
12728.

Which of the following lanthanide elements from tetrapositive ion in aqueous solution ?

Answer»

Sm
Gd
Pm
Ce

Answer :D
Discussion
12729.

Which of the following sol will be destabilised with ionic impurities - if present?

Answer»

Gum sol in WATER
Starch sol in water
Egg albumin sol in water
`Fe(OH)_(3)` sol in water

Solution :Only a lyophobic sols like `Fe(OH)_(3)` will be destabilised by IONIC impurities. All others are LYOPHILIC sols.
Discussion
12730.

Which of the following ligands is ambidentate ligand?

Answer»

`OVERSET(Ө)0CN`
`NO_(2)^(Ө)`
`NOS^(Ө)`
All of these

Answer :D
Discussion
12731.

Which of the followign statements about zerolites is not correct ?

Answer»

ZEOLITES are open STRUCTURES of silica in which trivalent aluminium is substituted by a fraction of silicon atoms.
Shape SELECTIVITY of zeolites depends upon porous structure of the catalyst
Zeolites are SYNTHETIC microporous aluminosilicates which do not exist naturally.
Zeolites are aluminosilicates having three DIMENSIONAL network.

Solution :Zeolites are naturally occuring or synthetic microporous aluminosilicates.
Discussion
12732.

Which is incorrect statement-

Answer»

Boric ACID in DILUTE aqueous solution is weak antiseptic for eye.
Chloramphenicol used in the treatment of TYPHOID, eye INFECTION and pneumonia.
BROAD spectrum antibioyics sffective against both gram positive and gram negative bacteras.
Bithional is used as antifertility drug.

Answer :D
Discussion
12733.

Which of the following will give benzoic acid on oxidation?

Answer»

BENZYL alcohol
Benzaldehyde
Acetophenone
All of these

Answer :D
Discussion
12734.

Which of the following will occur if0.1 M solution of a weak acid is diluted to 0.01 M at constant temperature

Answer»

`[H^(+)]` will decrease to 0.01 M
pH will decrese
percentage IONIZATION will INCREASE
`K_(a)` will increase

Solution :Ostwald.s dilution LAW, dilution increases ionisation.
Discussion
12735.

Which one of the following elements show different oxidation states ?

Answer»

SODIUM
Fluorine
Chlorine
POTASSIUM

ANSWER :C
Discussion
12736.

Which one of the following compounds cannot be used for the preparation of Grignard reagent

Answer»

`C_(2)H_(5)Br`
`HO-CH_(2)CH_(2)Cl`
`C_(6)H_(5)CH_(2)Cl`
`CH_(2)=CH-CH_(2)Cl`

Solution :GRIGNARD reagent cannot be prepared from a COMPOUND which consist in ADDITION to halogen, some reactive group such as -OH because it will react rapidly with the grignard reagent.
Discussion
12737.

Which one of the following impurities present in colloidal solution cannot be removed by electrodialysis?

Answer»

SODIUM chloride
Potassium SULPHATE
Urea
CALCIUM chloride

SOLUTION :Electrodialysisinvolvesmovementofionstowardsoppositelychargedelectrodes.
Ureabeingacovalentcompounddoes notdissociatetogiveionsand hence itcannotberemovedby ELECTRODIALYSIS. Howeverallthe other given compoundsareionicwhichcanundergodissociation to giveoppositelychargedionsandthuscanbeseparated.
Discussion
12738.

Which one of the following amines can be directly oxidised to the corresponding nitro compound by potassium permanganate?

Answer»

`CH_(3)NH_(2)`
`(CH_(3))_(2)CH-NH_(2)`
`(CH_(3))_(2)NH`
`C_(6)H_(5)NH_(2)`
Discussion
12739.

Which is not a mineral of Al?

Answer»

DIASPORE
BAUXITE
CORUNDUM
GALENA

ANSWER :D
Discussion
12740.

Which of the following species is not expected to be a ligand ?

Answer»

NO
`NH_(4)^(+)`
`NH_(2)CH_(2)CH_(2)NH_(2)`
CO

Solution :`NH_(4)^(+)`ion has no lone pair of ELECTRONS.
Discussion
12741.

Which alkyl halide from the following pairs would you expect to react more rapidly by an S_(N)2 mechanism ? Explain your answer.(i) CH_(3)CH_(2)CH_(2)CH_(2)BrORCH_(3)CH_(2)underset("Br")underset("| ")("C ")HCH_(3)(ii) CH_(3)CH_(2)underset("Br")underset("| ")("C ")HCH_(3)ORH_(3)C-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-Br(iii)CH_(3)underset(CH_(3))underset("|")("C ")HCH_(2)CH_(2)BrOR CH_(3)CH_(2)underset(CH_(3))underset("|")("C ")HCH_(2)Br

Answer»

Solution :The `S_(N)2` REACTION procceeds through transition state where the leaving group and the NUCLEOPHILE are bonded to carbon. The nucleophile always attacks from the opposite side of the leaving group and the attack is FAVOURED if there is no crowding near the carbon. Hence `1^(@)` - halide is most reactive where `3^(@)` is least reactive.
`1^(@)R-X gt 2^(@)R-X gt 3^(@)-R-X`
(i) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br` will be more reactive.
(ii) `CH_(3)-CH_(2)-underset("Br ")underset("| ")("C ")H-CH_(3)` will be more reactive.
(III) `CH_(3)underset(CH_(3))underset("|")(C ")HCH_(2)CH_(2)Br` will be more reactive,because `-CH_(3)` group is at greater distance from halogen.
Discussion
12742.

Titanium metal crystallises in a BCC arrangement and radius of an atom is 142 picometre. Determine atomic weight of titanium if density is 16.6 g/cm^(3). Also determine the number of unit cells present in a 5 cm^(3)block of titanium metals.

Answer»

Solution : In BCC arrangement of atoms the relatioship between edge length radius of atom is
`4r=sqrt(3a)`
Density `(rho)=(NM)/(N_(A)V)`
Where, N = Number of atoms per unit cell,
M = Molar mass, NA = Avogadro's number
V = Volume of unit cell
`implies16.6=(2M)/(6.023xx10^(23)((4)/(sqrt3)xx142xx10^(-10))^(3)`
Here, radius is taken in cm unit since, density is in g/`cm^(3)` unit. Solving : M = 176. Also mass of 5 `cm^(3)` BLOCK
`=5xx16.6`=83 g
`implies` Number of atoms is 5 `cm^(3)` block
`=(83)/(176)xx6.023xx10^(23)`
`implies` Number of unit CELLS=`(No. of atoms)/(2)`
`(83xx6.23xx10^(23))/(176xx2)=1.42xx10^(23)`
Discussion
12743.

Which is pseudo solid?

Answer»

Glass
Diamond
Sodium CHLORIDE
`CaCO_3`

ANSWER :A
Discussion
12744.

When propanal reacts with 2- methylpropanal in presence of NaOH, four different products are formed. The reaction is known as

Answer»

ALDOL CONDENSATION
CROSS aldol condensation
Cannizzaro reaction
HVZ condensation.

ANSWER :B
Discussion
12745.

The second order Grag diffraction of X-rays with lamda=1.0 Å from a set of parallel planes in a metal occurs at an angle of 60^(@). The distance between the scattering planes in the crystal is

Answer»

0.575 Å
1.00 Å
2.00 Å
1.15 Å

Solution :`n lamda=2dsin theta,`
`2xx1`Å`=2xxd SIN 60 implies d=1.15` Å `because (sin60=(SQRT(3))/(2))`
Discussion
12746.

Which of the following species is/are coloured ?

Answer»

`K_(2)Cr_(2)O_(7)`
`CrO_(2)Cl_(2)`
`Na[Ag(CN)_(2)]`
`Cl_(2)(g)`

Solution :(a) `K_(2)Cr_(2)O_(7) to "Due to CHARGE transfer"`.
(b) `CrO_(2)Cl_(2) to "Due to charge transfer"`.
(C )`Na[Ag(CN)_(2)] ton "Colourless"`.
(d) `Cl_(2)(g) to "Due to HOMO-LUMO ELECTRONIC transition"`.
Discussion
12747.

What type of isomerism is shown by benzaldoxime ?

Answer»

OPTICAL
Functional
Methamerism
GEOMETRICAL

Solution :Geometrical.
Discussion
12748.

What volume of H_(2)O_(2) solution of "11.2 volume"strength is required to liberate 2240 ml of O_(2) at NTP?

Answer»

300 ml
500 ml
100 ml
200 ml

Answer :D
Discussion
12749.

30 g Ba(MnO_(4))_(2) sample containing inertimpurity is completely reacting with 100 ml of "28 volume" strength of H_(2)O_(2) in acidic medium then what will be the percentage purity of Ba(MnO_(4))_(2) in the sample ? (Ba=137, Mn=55, O=16)

Answer»

`10%`
`40%`
`62.5%`
`80%`

ANSWER :C
Discussion
12750.

What is the percentage strength of "15 volume" H_(2)O_(2) ?

Answer»

`6.086 %`
`4.55%`
`3.03%`
`1.5%`

ANSWER :B
Discussion