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13401.

The type of isomerism shown by : CH_(3)CH(OH)COOH is :

Answer»

POSITION ISOMERISM
Functional isomerism
Optical isomerism
cis-trans isomerism

ANSWER :C
Discussion
13402.

Which of the following contributes to the double helical structure of DNA?

Answer»

HYDROGEN bond
Covalent bond
Disulphide bond
van der WAALS force

Solution :In double HELICAL structure of DNA the complementary base PAIRS (A=T and G=C) are linked through hydrogen bond.
Discussion
13403.

Which product is obtained on addition of Br_(2) water to phenol at room temperature ?

Answer»

Bromobenzene
2, 4, 6 TRIBROMO PHENOL
2, 4, 6 Tribromo benzene
4 - bromophenol

Solution :2, 4, 6 Tribromo phenol
Discussion
13404.

When one faraday current is passed which of the followingwoulddeposit1 gatomicweight of the metal

Answer»

NaCI
`BaCI_(2)`
`AICI_(3)`
`CuSO_(4)`

Solution :1 G ATOMIC WEIGHTOF metal will be deposited by one faraday of currentwhen metalhas one unitpositivecharge
a `NacI or Na^()CI^(-)`
b `BaCI_(2) or Ba^(2+) 2CI^(-)`
c `AICI_(3) or AI^(3+) 3cI^(-)`
d `CuSO_(4) or Cu^(2+) SO_(4)^(2-)`
`therefore`1 g atomic weightof `Na^(+)`is deposited by 1 F of CURRENT
Discussion
13405.

Which of the following complex is differ from other three on the basis of geometry and magneticbehaviour ?

Answer»

`[PdCl_4]^(-2)`
`[NI(Cl)_4]^(-2)`
`[RHCL(PPh_3)_3]`
`[AgF_4]^(-)`

ANSWER :B
Discussion
13406.

Which of the following is an example of elimination reaction ?

Answer»

DEHYDRATION of alcohol
Chlorination of `CH_4`
HYDROXYLATION of `C_2H_4`
NITRATION of benzene

Answer :A
Discussion
13407.

Which of the following polymer is stored in the liver of animals ?

Answer»

AMYLOSE
CELLULOSE
Amylopectin
Glycogen

ANSWER :D
Discussion
13408.

Which of the following reacts with glass ?

Answer»

`H_(2)SO_(4)`
`HF`
`K_(2)Cr_(2)O_(7)`
`HNO_(3)`.

Answer :B
Discussion
13409.

Van't Hoff factor for a solution is more than one. what is the conculsion drawn form it ?

Answer»

SOLUTION :It UNDERGO DISSOCIATION.
Discussion
13410.

Which of the following ethers will not form peroxide ?

Answer»




ANSWER :D
Discussion
13411.

the rate of the reaction at 25^(@)C "3 mol L"^(-1)" min"^(-1) . The temperature coefficient of a reaction is 2 andCalculate the rateat the temperature 75^(@)C.

Answer»

SOLUTION :According to Arrhenius, for every `10^(@)C` RISE in the TEMPERATURE, the temperature `=75^(@)C-25^(@)C=50^(@)C`
`=5xx10^(@)C`
The increase in the rate of the reaction `=2^(5)=32` times
The rate of reaction `75^(@)C=3xx32`
`=94" mol L"^(-1)"min"^(-1)`.
Discussion
13412.

The Tyndall effect is observed only when following conditions are satisfied. The diameter of the dispersed particles is much smaller than the wavelength of the light used. (b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used. (c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude. (d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

Answer»

(a) and (d)
(b) and (d)
(a) and (c)
(b) and (c) 

SOLUTION :Because in Tyndall effect, diameter of DISPERSED particles is SMALLER then WAVELENGTH of light is used. DEVIATION angle of despersing pause and despersing medium are different.
Discussion
13413.

Whichofthefollowingstatementsiscorrectabout theroleofsubstancesaddedinthefroth floatationprocess ?

Answer»

Collectorsenhancethenon - WETTABILITY ofthemineralparticles.
Collectorsenhancethe wettabilityofgangueparticles
By usingdepressantsintheprocess twosulphieorescan beseparated
Frothstabilisersdecreasewettabilityofgangue

ANSWER :A::C
Discussion
13414.

Which is most difficult to oxidise ?

Answer»

HCHO
`CH_(3)COCH_(3)`
`CH_(3)CHO`
`C_(2)H_(5)CHO`

ANSWER :B
Discussion
13415.

Which oneof the following has the smallest heat of hydrogenation per mole ?

Answer»

1-butene
trans -2-butene
Cis-2-butene
1,3-butadiene

Answer :D
Discussion
13416.

Which of the following can exist as food storages and structural materials?

Answer»

MONOSACCHARIDES
DISACCHARIDES
OLIGOSACCHARIDES
Polysaccharides

Answer :D
Discussion
13417.

What type of linkage holds together the monomers of DNA ?

Answer»

SOLUTION :The monomers of DNAare polydeoxyribonucleotides. These are held together by H-bonds. There are three H-bonds between GUANINE and cytosine `(G-=C)` and TWO between adenine and THYMINE `(A-=T)`.
Discussion
13418.

Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither ? Write the structures of the expected products of aldol condensation and Cannizzaro reaction. (i) Methanal "" (ii) 2-Methylpentanal (iii) Benzaldehyde "" (iv) Benzophenone (v) Cyclohexanone "" (vi) 1-Phenylpropanone (vii) Phenylacetaldehyde "" (viii) Butan-1-ol (ix) 2, 2-Dimethylbutanal.

Answer»

Solution :(ii) 2-Methylpentanal (V) cyclohexanone, (vi) 1-Phenylpropanone and (vii) Phenylacetaldehyde contain one or more o-hydrogens and hence undergo aldol condensation. The reactions and the structures of the expected products are given below:
`underset("2-Methylpentanal")underset(""CH_3)underset(""|)(2CH_3CH_2CH_2-CH-CHO)overset("Dil.NaOH")(RARR)underset("3-Hydroxy-2,4-dimethyl-2-propylheptanal")(overset(7)(C)H_3overset(6)(C)H_2overset(5)(C)H_2-underset(CH_3)underset(|)overset("4 ")(C)H-underset(OH)underset("| ")overset(3)(C)H-underset(CHO)underset("1|")overset(CH_3)overset("2|")(C)-CH_2CH_2CH_3) `

(i) Methanal, (iii) Benezaldelhyde and (ix) 2,2-dimethylbutanal do not contain `alpha`- hydrogen and hence undergo Cannizzaro reaction. The reactions and hte structures of the expected products are given below:
(i) `underset("Methanol")(2HCHO)overset("conc.NaOH")(rarr)underset("Methanol")(CH_3OH)+underset("Sodium methanoate")(HCOONA)`

(ix) `underset("2,2-Dimethylbutanal")(CH_3CH_2-underset(CH_3)underset(|)overset(CH_3)overset(|)(C)-CHO)underset(NaOH)overset("conc.")(rarr)underset("2,2-Dimethylbutan-1-ol")(CH_3CH_2-underset(CH_3)underset(|)overset(CH_3)overset(|)(C )-CH_2OH)+underset("Sodium 2,2-dimethylbutanoate")(CH_3CH_2-underset("CH_3)underset(|)overset(CH_3)overset(|)(C )-COONa)`
(iv) Benzophenone is a ketone having no `alpha`-hydrogen while (viii) Butan - 1- ol is an alcohol. Both of them NEITHER undergo aldol condensation nor Cannizzaro reaction.
Discussion
13419.

Which of the following minerals does NOT contain copper ?

Answer»

Malachite
Cuprite
Azurite
Corundum

Answer :D
Discussion
13420.

Which of the following statements are correct ? (1) After degradation, biopolymers can be converted into life essential products (2) Non-biodegradable polymers are active towards environmental process (3) Non-biodegradable polymers can be converted into life essential products (4) PHBV undergoes bacterial degradation in environmental conditions

Answer»

(1) and (3)
(1) and (4)
(2) and (4)
(2) and (3)

SOLUTION :(1) and (4)
Discussion
13421.

Which of the following has largest size?

Answer»

AL
`Al^(+)`
`Al^(2+)`
`Al^(3+)`

ANSWER :A
Discussion
13422.

Which polymer is used in preparation of capsules ?

Answer»

DECRON
Nylon-6
PLA
PHBV

SOLUTION :PHBV
Discussion
13423.

The total pressure exerted in ideal binary solution is given by P=P_(A)^(@)X_(A)+P_(B)^(@)X_(B) where P_(A)^(@)&P_(B)^(@) are the respective vapour pressure of pure components and X_(A)&X_(B) are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Datton's law partial pressure: Y_(A)=(P_(A)^(@)X_(A))/(P) If total pressure exerted in an ideal binary solution is given by P=(5400)/(60+30Y_(A))mm of Hg. The value of P_(A)^(@) is:

Answer»

40 MM of Hg
30 mm of Hg
60 mm of Hg
90 mm of Hg

Answer :C
Discussion
13424.

The total pressure exerted in ideal binary solution is given by P=P_(A)^(@)X_(A)+P_(B)^(@)X_(B) where P_(A)^(@)&P_(B)^(@) are the respective vapour pressure of pure components and X_(A)&X_(B) are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Datton's law partial pressure: Y_(A)=(P_(A)^(@)X_(A))/(P) If total pressure exerted in an ideal binary solution is given by P=(5400)/(60+30Y_(A))mm of Hg. The more volatile liquid is:

Answer»

LIQUID A
liquid B
both are same
it DEPENDS on the AMOUNT of A and B

Answer :B
Discussion
13425.

The total pressure exerted in ideal binary solution is given by P=P_(A)^(@)X_(A)+P_(B)^(@)X_(B) where P_(A)^(@)&P_(B)^(@) are the respective vapour pressure of pure components and X_(A)&X_(B) are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Datton's law partial pressure: Y_(A)=(P_(A)^(@)X_(A))/(P) If total pressure exerted in an ideal binary solution is given by P=(5400)/(60+30Y_(A))mm of Hg. If the value of Y_(A)=0.4 then the value of X_(B) is:

Answer»

`0.6`
`0.25`
`0.4`
`0.5`

ANSWER :D
Discussion
13426.

Which of the following is an anionic detergent

Answer»

Sodium STEARATE
sodium lauryl sulphate
cetytrimethyl AMMONIUM chloride
glyceryl oleate

Solution :Colloidal sol is a heterogeneous MIXTURE where the dispersed phase is a solid and the dispersion medium is a liquid
Discussion
13427.

The substance used as a smoke in warfare is

Answer»

`SiCl_4`
`PH_3`
`PCl_5`
`C_2H_2`

ANSWER :B
Discussion
13428.

What are primary alcohols?

Answer»

Solution :ALCOHOLS in which -OH group is attached to a primary carbon, i.e., alcohols which CONTAIN the grouping `-CH_(2)OH` are called primary `(1^(@))` alcohols. For EXAMPLE.
`UNDERSET("ETHANOL")(CH_(3)-CH_(2)OH)""underset("Propan-1-ol")(CH_(3)CH_(2)-CH_(2)OH)""underset("Butan-1-ol")(CH_(3)CH_(2)CH_(2)-CH_(2)OH)`
Discussion
13429.

Write structures of the compound whose IUPAC names are as follows : Cyclopent-3-en-1-ol

Answer»

SOLUTION :
Discussion
13430.

Which of the folloiwng statements is true?

Answer»

When an chiral MOLECULE reacts to given a chiral molecule the product is always recemic.
In chemical reactions the change from an`(S)` reactant to an `(R)` product always signals an INVERSION of configuration
An optically inavtice substance must be achiral
An achiral COMPOUND can have chiral centers

Solution :An example of an achiral compound with chiral centers is a meso compound
(1) False because if an optically active chiral co-reactant, solvent or catayst such as an enzyme is used, the product will likely be optically active
(2) False because the priority sequence of LIGANDS may change
(3) False beacuse a racemate shows no optical activity
(4) False beacuse the sign of rotation is not related to the configuration.
Discussion
13431.

Write the structures of three pentenes that would all yield pentane on hydrogenation.

Answer»

SOLUTION :
Discussion
13432.

Which observation (s) will be correct about the major products X and Y of the following reaction >

Answer»




SOLUTION :
Discussion
13433.

Toluene can be prepared by

Answer»

Heated sodium SALT of p-toulic acid with soda lime
Distillation m-cresol with Zn dust
Treating phenylmagnesium BROMIDE with methanol
Reduction of BENZYL alcohols with HI and red P.

Solution :
Discussion
13434.

Which bonds are formed by a carbon atom with sp^(2)-hybridisation ?

Answer»

`4PI`-bonds
`2pi`-bonds and `2sigma`-bonds
`1pi`-bonds and `3sigma`-bonds
`4sigma`-bonds

Solution :By `SP^(2)`-HYBRIDISATION.
Hybridisation orbital =3 [`3 sigma`- bonds] Unhydrised orbital =1 `[1 pi` - BOND]
Discussion
13435.

Total number of electrons in 81 g of Al^(3+) are (Given : at. no. of Al = 13 and at mass = 27 u)

Answer»

`1.806 XX 10^(25)`
`6.02 xx 10^(24)`
`1.22 xx 10^(25)`
`2.347 xx 10^(25)`

ANSWER :A
Discussion
13436.

The values of observed and calculated molecular weights of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate is:

Answer»

`60%`
`83.5%`
`46.7%`
`60.23%`

ANSWER :B
Discussion
13437.

Which of the following is not a protein ?

Answer»

HAIR
Silk
Nails
DNA

Solution :DNA
Discussion
13438.

Which of the following Allene is achiral?

Answer»




ANSWER :A
Discussion
13439.

Which of the following oxidation reactions can be carried out with chromic acid in aqueous actone at 5- 10^(@)C ?

Answer»

`CH_(3)(CH_(2))_(3)C-=C-CH(OH)CH_(3)rarrCH_(3)(CH_(2))_(3)C-=C-(CO)-CH_(3)`
`CH_(3)(CH_(2))_(3)-CH=CH-CH_(2)OHrarrCH_(3)(CH_(2))_(3)-CH-=CH-CHO`
`C_(6)H_(5)CH_(3)rarrC_(6)H_(5) COOH`
`CH_(3)(CH_(2))_(3)H_(2)OH rarrC H_(3)(CH_(2))_(3)CHO`

ANSWER :A::B::C::D
Discussion
13440.

What is the difference between the mass of a molecule and gram molecular mass ?

Answer»

SOLUTION :Mass of a MOLECULE is the actual mass of a single molecule expressed in grams whereas gram molecular mass is the mass in grams of Avogadro's number of MOLECULES.
Discussion
13441.

Which of the following statements are correct for van't Hoff factor 'i' for a solution of weak electrolyte A_(x)B_(y)?

Answer»

`o=1-a+Xa+Ya`
`igt1` at normal dilution
`i` increases more rapidly with dilution and attains a limiting alue of `(x+y
The increaes in `'i'` with dilution is due to increase in MOLALITY of SOLUTION with dilution

Solution :`i=1+(x+y-1)ALPHA`
Discussion
13442.

Which of the following soled salt on heating with solid K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) orange red vapours are evolved which turn aquous NaOH solution yellow?

Answer»

`NaBr`
`NaCl`
`NaNO_(3)`
`NAI`

Solution :`NaCl_((s))+K_(2)Cr_(2)O_(7)_((s))+H_(2)SO_(4)(few drops) overset("Non-redox")underset("reaction")(to) underset("Orange RED vapours")(CrO_(2)Cl_(2)(uarr)) +HO`
`CrO_(2)Cl_(2)+OH^(-)(aq.) to underset("Yellow solution")(CrO_(4)^(2-))(aq.)+CL^(-)+2H_(2)O`
Discussion
13443.

Which one of the foolowing ores is best concentrated by froth-floatation method?

Answer»

MALACHITE
Cassiterite
GALENA
Magnetite.

Solution :As galena is a SULPHIDE ORE.
Discussion
13444.

When a mixture of methane and oxygen is passed through heated molybdenum oxide, the main product formed is

Answer»

methanoic acid
ethanol
methanol
methanol

Solution :`CH_(4)+O_(2) UNDERSET(550K)overset(MoO)to HCHO+H_(2)O`
Discussion
13445.

Write one species which is Isoelectronic with carbon alom?

Answer»

SOLUTION :`N^(+)`
Discussion
13446.

Which of the following pairs of transition metal ions are the stronger oxidising agents in aquesous solutions

Answer»

`V^(2+)` and `Cr^(2+)`
`Ti^(2+)` and `Cr^(2+)`
`MN^(2+)` and `Co^(3+)`
`V^(2+)` and `Fe^(2+)`

Solution :OXIDISING agents are those which OXIDISE other COMPOUNDS and get reduced themselves.
`Mn^(3+)` and `Co^(3+)` can act as a stronger oxidising agents because their least oxidation state to +2 oxidation state hence act as STRONG oxidising agents.
Discussion
13447.

When Cl_2 gas is passed though hot and conc. Solution of KOH, following compound is formed

Answer»

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

Solution :`6KOH +3Cl_2 to 5KCl + KClO_(3) + 3H_(2)O`
Discussion
13448.

Which type of class of drugs does ranitidine belong to?

Answer»

ANTIHISTAMINES.
Neurologically ACTIVE DRUGS.
Antimicrobial drugs.
Antifertility drugs. 

SOLUTION :Antihistamines.
Discussion
13449.

Which one of the following bonds has the highest average bond energy (kcal/mol)

Answer»

S=O
`C-=C`
`C-=N`
`N-=N`

SOLUTION :By DEFINITION of HESS's LAW.
Discussion
13450.

The total number of maxima in the radial probabililty disribution curve of 2s is :

Answer»

ONE
TWO
six
four

Solution :2s orbital has two maxima in RADIAL probability DISTRIBUTION graph.
Discussion