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5051.

Which of the following alcohol is secondary (2^(@)) alcohol ?

Answer»

ISOBUTYL alcohol
Ethylene glycol
Neo pentanol
Iso PROPYL alcohol

Solution :
Discussion
5052.

The reagent used for testing ammonia is:

Answer»


ANSWER :B
Discussion
5053.

Writenames of monomer/s of the followingand classify them as addition or condensation polymers . (a) Teflon(b) Bakelite. (c) Natural Rubber .

Answer»

Solution :(a) MONOMER of teflon is tetrafluoroethylene `(CF_(2) = CF_(2))` . It is anaddition polymer.
(b) Monomersof bakeliteareformaldehydeand phneol. Itis ca condensationpolymer.
(C) Monomer of natural rubberis ISOPRENE (2- methyl -1,3-butadiene( . It isan ADDITION polymer.
Discussion
5054.

What is the [H^(+)] in a 0.40 M solution of HOCl, K_(a)=3.5xx10^(-8)?

Answer»

`1.4xx10^(-8)M`
`1.2xx10^(-4)M`
`1.9xx10^(-4)M`
`3.7xx10^(-4)M`

Solution :`[H^(+)]=sqrt(K_(a)XXC)`
`=sqrt(3.5xx10^(-8)xx0.4)`
`=sqrt(140xx10^(-10))`
`=12XX10^(-5)`
`=1.2xx10^(-4)`
Discussion
5055.

Which of the following statements are not true?

Answer»

VACANCY defect results in a decrease in the density of the substance. 
Interstitial defects results in an INCREASE in the density of the substance. 
Impurity defect has no effect on the density of the substance. 
Frenkel defect results in an increase in the density of the substance. 

Solution :Impurity defects creats a HOLE at a site of cation and hence density of the lattice changes.
Ex. : Addition of `SrCl_2` to `NACL` crystal.
Frenkel defect cause no change in the density
Discussion
5056.

Which one of the following is an example of co-polymer?

Answer»

Buna-S
Teflon
PVC
Polypropylene

Solution :Buna-S is an EXAMPLE of co-polymer. These POLYMERS are formed by POLYMERISATION of more than one monomer are called co-polymers. Buna-S is formed by polymerisation of buta-1,3-diene and STYRENE.
Discussion
5057.

Which of the following order of relative strength of acid is correct ?

Answer»

`F - CH_(2) - COOH gt Cl CH_(2) COOH gt Br - CH_(2) - COOH gt CH_(3) COOH`
`CH_(3) COOH gt F - CH_(2) - COOH gt Cl CH_(2) - COOH gt CH_(3) Br - CH_(2) COOH`
`Br CH_(2) COOH gt Cl - CH_(2) COOH gt F - CH_(2) - COOH gt CH_(3) COOH`
`ClCH_(2) COOH gt FCH_(2) - COOH gt Br CH_(2) - COOH gt CH_(3) COOH`

ANSWER :A
Discussion
5058.

Tin reacts with conc. H_2SO_4 to give:

Answer»

STANNIC acid
Stannous SULPHATE
`BETA`-stannic acid
Stannic sulphate

Answer :D
Discussion
5059.

Which one is a test for proteins:

Answer»

Brillstein test
Biuret test
Benedict's test
Molisch's test

Answer :B
Discussion
5060.

Write the structures of the compound whose IUPAC names are as follows: (i) 2-Methylbutan-2-ol (ii) 1-Phenylpropan-2-ol (iii) 3,5-Dimethylhexane-1,3,5-triol (iv) 2,3-Diethylphenol (v) 1-Ethoxypropane (vi) 2-Ethoxy-3-methylpentane (vii) Cyclohexylmethanol (viii) 3-Cyclohexylpentan-3-ol (ix) Cycopent-3-en-1-ol (x) 5-Chloromethylpentan-1-ol.

Answer»

SOLUTION :
Discussion
5061.

Write the mathemtatical expression for limiting molar conductivity of sodiumm chloride [NaCI].

Answer»

SOLUTION :`lamda_(NACI)^(@) = lamda_(NA^+)^(@) + lamda_(CI^-)^(@)`
Discussion
5062.

The wt. of unhydrous sodium carbonate needed to prepare 500 ml of a decinormal solution would be

Answer»

5.3 g
10.6g
1.06 g
2.65 g

Solution :WT. PER `DM^(3) = N xx EQ. Wt.`
`= 0.1 xx 53 = 5.3 g`
Wt. in 500 ml `= (5.3)/2= 2.65 g.
Discussion
5063.

Zinc reacts with hot and concetrated H_(2)SO_(4) to give

Answer»

`H_(2)`
`SO_(2)`
`SO_(3)`
`H_(2)S`

Solution :Zink react with conc. And HOT `H_(2)SO_(4)` to GIVE `SO_(2)`
`underset("sulphuric acid")underset("(conc.)")(Zn+2H_(2)SO_(4))overset(DELTA)rarrunderset("zink sulphate")(ZnSO_(4))+2H_(2)O+underset("sulphur dioxide")(SO_(2))`
Discussion
5064.

The value of K_b is highest in case :

Answer»

p-methoxy aniline
p-chloroaniline
p-nitroaniline
p- METHYL aniline

Answer :D
Discussion
5065.

Which gives least basic oxide?

Answer»

Mg
Ba
Be
Ra

Answer :C
Discussion
5066.

Which vitamin deficiency leads to the disease megaloblastic anaemia?

Answer»

vitamin`B_(9)`
vitamin `B_(6)`
vitamin `B_(12)`
vitamin `B_(2)`

ANSWER :A
Discussion
5067.

What is the pH value of 0.1(M) HCOOH solution if its ionisation constant, K_ is 1.78xx10^(-4) at 25^(@)C ? How much water is to be added to 1L of this solution so that the pH of the solution becomes double of its initial value?

Answer»

Solution :100 ML. 0.075 (M) Ca`(OH)_2`
`=2xx(0.075)/(1000)xx100-=0.015mol OH^-`
100 mL of 0.1(M) `HCL-=(0.1)/(1000)xx100-=0.1mol` of `H^+` ions
0.01 mol of `H^+` ions react completely with the same amount of `OH^-` ions and the solution contains (0.015-0.01) mol =0.005 mL of `OH^-` ions
`:.` In the solution `[OH^-]=(0.005)/(200)xx1000=0.025(M)`
`:.` POH of the solution `=-log_(10)(0.025)=1.6`
`:.` pH of the solution `=-log_(10)(0.025)=1.6`
Discussion
5068.

When initial concentration of a reactant is doubled in a reaction, the half-life period is not affected. The order of reaction is

Answer»

second
more than zero but LESS than FIRST
zero
first

Solution :Half-life period of a first order reaction is INDEPENDENT of initial concentration of the reactant
`(t_(1//2) = (0*693)/(K))`
Discussion
5069.

The type of bond formed between H^+ and NH_3 in NH_4^- ion is:

Answer»

Ionic
Covalent
Dative
Hydrogen

Answer :C
Discussion
5070.

Which of the following compounds is square planar and does have any unpaired electron?

Answer»

`NI(CO)_(4)`
`[Ni(H_(2)O)_(6)]^(2+)`
`[NiCl_(4)]^(2-)`
`[Ni(CN)_(4)]^(2-)`

Solution :`[Ni(CN)_(4)]^(2-)`

Therefore, hybridisation is `DSP^(2)`, structure is square plnar and it is diamagnetic.
Discussion
5071.

Which of the following ions can be separated by using dil. HCI?

Answer»

`Ag^(+)` and `Cu^(+2)`
`Ag^(+)` and `HG^(+2)`
`Hg^(+2)` and `Cd^(+2)`
`Ag^(+)` and `Al^(+3)`

Solution :`Ag^(+), Pb^(2+), Hg^(+)` GIVEN WHITE ppt AGCL, `PbCl_(2), Hg_(2)Cl_(2)`
Discussion
5072.

Write the IUPAC name of K_3[Fe(CN)_6] ,[Co(NH_3)_6]Cl_3

Answer»

SOLUTION :Potassiumhexacyanoferrate(III)HEXAAMMINECOBALT(III)CHLORIDE
Discussion
5073.

Which among the following has the highest pH?

Answer»

`1 M" "NH_4 OH`
`1 M" " HCI`
`1M" " NAOH`
`0.1 M" " NaOH`

ANSWER :C
Discussion
5074.

Which of the following is the soft base?

Answer»

`CO_(3)^(2-)` ION :CO
 `Ce^(3+)`
`PB^(2+)`

Answer :B
Discussion
5075.

Which stoichiometric defect decreases the density of the crystal?

Answer»

Schottky
Frenkel
F-centre
Interstitial

Answer :A
Discussion
5076.

Which of the following is vinylic halide ?

Answer»

`H_(3)C-CH=underset("BR ")underset("| ")("C ")-CH_(2)-underset(CH_(3))underset("|")("C ")H-CH_(3)`

`CH_(3)CH_(2)-CH=underset("Br ")underset("| ")("C ")-CH_(2)-CH_(2)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-CH_(3)`

Answer :C
Discussion
5077.

Which of the following compounds does not contain an- OHgroup ?

Answer»

Alcohol
PHENOL
Aldehyde
Carboxylic ACID

Answer :C
Discussion
5078.

The two type of bonds present in B_2H_6 are covalent and :

Answer»

Ionic
Coordinate
Hydrogen BRIDGE bond
None of the above

Answer :C
Discussion
5079.

Which of the following acid give positive Tollen's reagent test.

Answer»



`{:(CO_(2)H),("|"),(CO_(2)H):}`
`HCO_(2)H`

SOLUTION :
Discussion
5080.

Which of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?

Answer»

`(C_(2)H_(5))_(2)NH`
`CH_(3)-UNDERSET(CH_(3))underset(|)N-C_(6)H_(5)`
`CH_(3)NH_(2)`
`C_(6)H_(5)NHC_(6)H_(5)`

Solution :`C_(6)H_(5)SO_(2)Cl+NH_(2)-CH_(3)toC_(6)H_(5)SO_(2)NH-CH_(3)`
Discussion
5081.

What are emulsions ? Give an example of an emulsion.

Answer»

Solution : (a) Emulsions. A colloidal dispersion of one liquid in another liquid is called EMULSION. The two liquids used for making emulsions are IMMISCIBLE with each other. For example, milk is emulsion in which liquid fat is DISPERSED in water.
(b) Classification of emulsions. Emulsions are of two types: (i) Oil-in-water emulsions. In this type of emulsion, the dispersed phase is oil and dispersion MEDIUM is water. For example, milk is an example of soluble fats in water. Other examples are vanishing cream. (II) Water-in-oil emulsions. In this type of emulsion, the dispersed phase is water and the dispersion medium is oil. For example, butter is an example in which water is dispersed in oil. Other examples are cold cream, cod liver oil, etc.
Discussion
5082.

Write the complete nuclear reaction, (i) _(92)^(235)U+_(0)^(1)nto_(38)^(92)Sr+Xe+3_(0)^(1)n (ii) _(92)^(235)U+_(0)^(1)nto………………+_(52)^(137)Tc+_(40)^(97)Zr (iii) _(34)^(86)Se+to……………….2_(-1)^(0)e

Answer»


Answer :`(i) ""_(54)^(141)XE`
`(ii) 2_(0)^(1)n`
`(iii)""_(36)^(86)Kr`
Discussion
5083.

Write three distinct differences between physical adsorption and chemisorption.

Answer»

SOLUTION :
Discussion
5084.

What is vulcanisation ?

Answer»

Solution :Vulcanisation is a process of HEATING natural rubber with elemental SULPHUR or sulphur COMPOUNDS which give greater tensile STRENGTH and elasticity to the rubber.
Discussion
5085.

Which defect increases the density of a crystal lattice ?

Answer»

VACANCY 
FRENKEL 
SCHOTTKY 
INTERSTITIAL 

ANSWER :D
Discussion
5086.

Y is

Answer»




SOLUTION :
Discussion
5087.

What is orlon?

Answer»

SOLUTION :It is POLYMER of ACRYLONITRILE.
Discussion
5088.

Which of the following is ann oxidizing agent?

Answer»

`MN(CO)_(5)`
`Fe(CO)_(5)`
`Mn_(2)(CO)_(10)`
`Fe_(2)(CO)_(9)`

SOLUTION :`underset("LESS STABLE")(Mn(CO)_(5)+overline(e)tounderset("more stable, as EAN of Mn=36 (Kr)")([Mn(CO)_(5)]^(-))`
Discussion
5089.

Which among the following is very strong o-p-directing groups?

Answer»

`-CL`
`-OR`
`-NH_2`
`-NHR`

SOLUTION :The directive INFLUENCE ORDER is `O^(-) gt NR_2 gt NHR gt NH_2 gt OH gt OCH_3 ~~ NHCOCH_3 gt CH_3 gt X`
Discussion
5090.

The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25^(@)C. The equilibrium constant of the reaction would be

Answer»

`2.0xx10^(11)`
`4.0xx10^(12)`
`1.0xx10^(2)`
`1.0xx10^(10)`

ANSWER :D
Discussion
5091.

Which of the following complex(s) will have blue colour solution or ppt ?

Answer»

`[Cu(NH_(3))_(4)]SO_(4)`
`[Cu(NH_(3))_(4)](OH)_(2)`
`CO[Hg(SCN)_(4)]`
`K_(3)[Co(NO_(2))_(6)]`

Answer :a,b,C
Discussion
5092.

Which of the following is a network crystalline solid?

Answer»

`I_(2)`
AIN
NACL
Ice

Answer :B
Discussion
5093.

Which of the following solids is a covalent crystal ?

Answer»

SODIUM chloride
Quartz
Sucrose
Iodine

Answer :B
Discussion
5094.

The work done by a weightless piston in causing an expansion triangleV( at constant temperature), when the opposing pressure, P is variable, is given by:

Answer»

`W=-intPtriangleV`
W=0
`W=-PtriangleV`
None

Answer :A
Discussion
5095.

Write the complete nuclear reactions : ltbr. a.._(4)Be^(9)+ ._(9)He^(4) rarr._(6)C^(12)+................... b.._(1)H^(3)rarr ._(2)He^(3)+.............. c. ._(7)N^(14)+._(2)He^(4)rarr ._(8)O^(17)+......... d. ._(92)U^(235)+._(0)n^(1) rarr ._(38)Sr^(92)+....Xe3._(0)n^(1) e. ._(3)Li^(7)+ ._(0)n^(1)rarr2 ._(2)He^(4+).......... f. ._(92)U^(238)+........rarr._(92)U^(239)rarr._(93)Np^(239)+.... g. ._(7)N^(14)+._(0)n^(1)rarr ._(1)H^(3)+.......... h. ._(3)Li^(7)+............. rarr._(4)Be^(8)+gamma- radiations i.._(1)H^(2)+............ rarr ._(2)He ^(4)+._(0)n^(1)

Answer»


Answer :`{:(a. ._(0)N^(1),,,,b. ._(-1)e^(0)),(c. ._(1)H^(1),,,,d. ._(54)Xe^(141)),(e. ._(-1)e^(0),,,,f. ._(0)n^(1) ._(-1)e^(0)),(G. ._(1)H^(3),,,,h. ._(1)H^(1)),(i. ._(0)n^(1),,,,):} `
Discussion
5096.

Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1 molof X and 3 mol of Y is 550 mm Hg. At the same temperature if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be respectively

Answer»

200 and 300
300 and 400
400 and 600
500 and 600

Solution :`x_(A)=(1)/(4)=0.25,x_(y)=0.75`
`P_("total")=x_(X)xxp_(X)^(@)+x_(Y)xxp_(Y)^(@)`
i.e., `550=0.25p_(X)^(@)+0.75p_(Y)^(@)`
`"or"2200=p_(X)^(@)+3p_(Y)^(@)"...(i)"`
After adding 1 mol of Y,
`x_(X)=(1)/(5)=0.20, x_(Y)=0.80`
`THEREFORE""560=0.20p_(X)^(@)+0.80p_(Y)^(@)`
`"or"2800 = p_(X)^(@)+4p_(Y)^(@)"...(ii)"`
Solving the two EQUATIONS, we get
`p_(Y)^(@)=600mm, p_(X)^(@)=400mm`
Discussion
5097.

Which one of the following does not undergo iodoform reaction

Answer»

SECONDARY butylalconol
Isopropyl alchohol
DIETHYL ketone
Ethyl alcohol

Solution :
Discussion
5098.

Two reactants R_(1) and R_(2) have identical pre-exponential factors . Activation energy of R_(1) exceeds that of R_(2) by 10 kJ mol^(-1) . If k_(1) and k_(2) are rate constants for reaction R_(1) and R_(2) respectively at 300 K , then Ln(k_(2)//k_(1)) is equal to : ( R = 8.314 J mol^(-1) K^(-1))

Answer»

12
6
4
8

Solution :`k_(1) = Ae^(-E_(a_(1)) //RT) , k_(2) = Ae^(-(Ea_(1) - 10) //RT)`
Ln `((k_(2))/(k_(1))) = (10)/(RT) = (10)/(8.314 xx 10^(-3) xx 300) = 4`
Discussion
5099.

Whatis VanArkelmethodofobtainingultrapuremetals ?

Answer»

Solution :The impuremetal (TI orZr) isfirstconvertedintoitsvolatile iodilebyheatingwith ` I _2`at somelowtemperature. Thevolatile iodidethusformedisseparated fromimpurities.It isdecomposedatasuitable high temperatureto givethepuremetal. Forexample,
`underset (("Impure"))(Zr (s)) +2 I_2 (G) overset(870 K ) toZrl_4 (g)overset (2075 K )underset ("W filament") tounderset (("PURE"))(Zr(s)) +2I_2 (g) `
Discussion
5100.

Which is the correct for radius of atom in ccp unit cell?

Answer»

`R = 1/(2sqrt(2)) cdot a`
`r = (SQRT3)/4 cdot a`
`r = 4/(sqrt3) cdot a`
`r = 2sqrt(2) cdot a`

Answer :A
Discussion