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5251.

Two reaction A rarr B and C rarr D has the energy of activation 40 kJ and 60 kJ respectively. Which of the following statement is correct ?

Answer»

Comparison of rate cannot be DETERMINED
The REACTION `A rarr B` proceeds at a faster rate COMPARED to the reaction `C rarr D`
The reaction `A rarr B` proceeds at a slower rate compared to the reaction `C rarr D`.
Comparison of the cannot be determined

ANSWER :B
Discussion
5252.

Which will not give test of all the ions present in it?

Answer»

`K_(2)Fe_(2)(SO_(4))_(4).24H_(2)O`
`(NH_(4))_(2)FE(SO_()4))_(2).6H_(2)O`
`K_(3)[Fe(CN)_(6)]`
`Fe_(2)(SO_(4))_(3)`

Solution :`K_(3)[Fe(CN)_(6)]` GIVES test of `K^(+)`and not `Fe^(3+)`.
Discussion
5253.

Write the conditions to maximise the yield of H_2SO_(4)by Contact process.

Answer»

Solution :The important step in manufacture of sulphuric acid is CATALYTIC OXIDATION of `SO_2` to `SO_(3)`
`2SO_(2)(g) + O_(2)(g) overset(V_(2)O_(5))to 2SO_(3)(g), DeltaH = -196.6 kJ//"mol"^(-1))`
The reaction is exothermic and REVERSIBLE. Hence, low temperature and high pressure shifts the reaction toward product (`SO_(3)`) in accordance to Le-Chatelier.s principle. The process is carried out at 2 bar pressure and 720 K temperature.
Discussion
5254.

When dil. Hypo is treated with excess AgNO_(3) the chemical finally formed is

Answer»

`Na_(3)[AG(S_(2)O_(3))_(3)]`
`Na_(3)[Ag(S_(2)O_(3))_(2)]`
`Ag_(2)S`
`Ag_(2)S_(2)O_(3)`

ANSWER :C
Discussion
5255.

Which of the following statements is incorrect about enzyme catalysis ?

Answer»

Enzymes are mostly proteinous in nature
Enzymes ACTION is pecific
Enzymes are denatured by ULTRAVIOLET rays and at high temperature
Enzymes are least reactive at optimum temperature

SOLUTION :Enzymes are most reactive at optimum temperature.
Discussion
5256.

Which of the following gas turn starch iodide paper blue ?

Answer»

`CO_(2)`
`SO_(2)`
`NO_(2)`
`H_(2)S`

ANSWER :D
Discussion
5257.

Which is not correct statement ?

Answer»

Casseterite, chromite and haematitie are concentrated by HYDRAULIC WASHING (Tabling).
Pure `Al_(2)O_(3)` is obtained from the bauxite ore by leaching in the Bayer's process
Sulphide ore is concentrated by calcination method
Roasting can convert sulphide into oxide or dulphate and PART of sulphide MAY also act as a reducing agent

Answer :C
Discussion
5258.

When iron hydroxide colloidal sol which is positively charged, and colloidal gold which is negatively charged are mixed, which of the following observations is not correct?

Answer»

There is no EFFECT of mixing the sols.
Mutual coagulation in both can be takes place.
Ferric HYDROXIDE is COAGULATED
Gold sol is coagulated

Answer :A
Discussion
5259.

Which one of the following compound would not be oxidised by acidified K_2Cr_2O_7 ?

Answer»

`CH_3OH`
`(CH_3)_2CHOH`
`(CH_3)_3COH`
`C_2H_5OH`

SOLUTION :Because of absence of `ALPHA`-hydrogen ATOMS tertiary alcohols are resist OXIDATION. Compound (C) is t-butyl ALCOHOL.
Discussion
5260.

Which one of the following will give recemised product in C_(2)H_(5)OH ?

Answer»

`CH_(3)-underset(CH_(3))underset(|)(CH)-Br`
`Ph-underset(CH_(3))underset(|)OVERSET(CH_(3))overset(|)C-Cl`
`Ph-underset(H)underset(|)overset(CH_(3))overset(|)C-Cl`

Answer :C
Discussion
5261.

Which of the following statement(s) is/are correct with respect to the crystal field theory ?

Answer»

It considers only the metal ion d-orbital and GIVES no CONSIDERATION at all to other metal orbitals.
It cannot account for the `pi-bonding ` in complexes.
The ligands are point CHARGES which are either ions or neutral molecuels.
The magnetic properties can be explained in term of SPLITTING of d-orbital enetgies in different cystal field.

Answer :A::B::C::D
Discussion
5262.

Which statement is correct about physical adsorption?

Answer»

It is highly specific
It is unimolecular layer adsorption
It DEPENDS on critical TEMPERATURE of adsorbate
It is IRREVERSIBLE 

Answer :C
Discussion
5263.

Which of the followingis mainly presentin proteins ?

Answer»

`BETA` - KETOACID
`ALPHA` - amino acid
`alpha,beta` - ketol
amide and acids

ANSWER :B
Discussion
5264.

Write short notes on Propoff's rule.

Answer»

SOLUTION :During oxidation of unsymmetric ketones with oxidising agent which brings about the cleavage of C-C bond, the SMALLER ALKYL group RESULTING in the carboxylic acids.
`CH_(3)-CH_(2)-CH_(2)-underset(O)underset(||)(C)-CH_(3)underset("CONC."HNO_(3))overset((O))tounderset("Propanoic acid")(CH_(3)CH_(2)-COOH)+underset("acetic acid")(CH_(3)COOH)`
Discussion
5265.

Which of the following statements is are NOT TRUE about the diagonal relationship of Be and Al (i) Both react with NaOH to liberate hydrogen (ii) Their oxides are basic(iii)They are made passive by nitric acid (iv)Their carbides give acetylene on treatment with water

Answer»

Only (i)
(II) and (III)
Only (IV)
(ii) and (iv)

ANSWER :D
Discussion
5266.

Which of the following properties are different for neutral atoms of isotopes of the same element

Answer»

Mass
Atomic NUMBER
General CHEMICAL reactions
Number of electrons

Solution :ISOTOPES have same atomic number but DIFFERENT mass number
Discussion
5267.

Which method is used for identification, detection and estimation of many substances even if they are in micro quantities?

Answer»

LASSAIGNE's test
Carius METHOD
Kjeldhals method
CHROMATOGRAPHY

Solution :Chromatography
Discussion
5268.

What is the difference between the following ? (i)2.5xx10^(3)g and 2.50 xx10^(3)g (ii) 160 cm and 160.0 cm.

Answer»

Solution :(i) `2.5xx10^(3)` has two SIGNIFICANT FIGURES while `2.50xx10^(3)` has three significant figures. Hence, `2.50xx10^(3)` represents GREATER accuracy than `2.5xx10^(3)` . (II) 160 has three significant figures while 160.0 has four significant figures. Hence, 160.0 represents greater accuracy.
Discussion
5269.

The structure of one of the enantiomers of the amino acid cysteine is shown below. Classify this structure as : (a) R or S (b) D or L.

Answer»


SOLUTION :(R)
Lowest PRIORITY atom is PRESENT on Horizontal line so cofiguration will be (R)
(L)
`NH_(2)` group is situated on L.H.S.
Discussion
5270.

Which of the following polymers are used as fibre ?

Answer»

Polytetrafluoroethane
POLYCHLOROPRENE
Nylon
Terylene

Solution :Nylon and terylenes are used as fibre DUE to strong intermolecular FORCES LIKE H-bonding which lead to close packing in chain and thus IMPART crystalline nature.
Discussion
5271.

What is tha molalilty of pure water at 273 K ?

Answer»

SOLUTION :55.55 m.
Discussion
5272.

Which follows EAN rule:

Answer»

`FE(Co)_5`
`NI(CO)_4`
`K_4Fe(CN)_6
All are Correct

Answer :D
Discussion
5273.

What will be the product when C_(6)H_(5)MgBr is treated with water?

Answer»

`CH_(4)`
Phenol
Benzene
Diphenyl

Answer :C
Discussion
5274.

Which is alloyed with copper to from bronze ?

Answer»

Iron
Manganese
Tin
Zine

ANSWER :C
Discussion
5275.

When HBr adds on hex-1-ene in the presence of benzoyl peroxide, the product is

Answer»

2-bromohexane <BR>2, 3-dibromohexane
1, 2-dibromohexane
1-bromohexane

Solution :`underset("Hex-1-ene")(CH_(3)-CH_(2) - CH_(2) - CH_(2) - CH = CH_(2)) underset("Peroxide")OVERSET(HBr)RARR underset("1-Bromohexane")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)Br)`
It is ACCORDING to anti-Markovnikov rule.
Discussion
5276.

The solubility of PbCl_(2) is

Answer»

`sqrt(K_(SP))`
`3sqrt(K_(sp))`
`3sqrt((K_(sp))/(4))`
`sqrt(8K_(sp))`

Solution :`{:(PbCl_(2) hArr,Pb^(2+),+,2CL^(-)),(,S,,S):}`
`K_(sp)` of `PbCl_(2) = [Pb^(2+)] xx [Cl^(-)]^(2) , K_(sp) = S xx (2S)^(2)`
`K_(sp) S xx 4S^(2) = 4S^(3), S^(3) = (K_(sp))/(4) , S = 3sqrt((K_(sp))/(4))`
Discussion
5277.

Which of the following complex exhibits the highest paramagnetic behaviour ? where gly = glycine, en = ethylene diamine and bpy = bipyridyl moities (At Nos. Ti = 22, V = 23, Fe = 26, Co = 27)

Answer»

`[V(gly)_(2)(OH)_(2)(NH_(3))_(2)]^(+)`
`[Fe(en)(bpy)(NH_(3))_(2)]^(2+)`
`[Co(OX)_(2)(OH)_(2)]^(2-)`
`[Ti(NH_(3))_(6)]^(3+)`

Solution :Ox. State of Vin (a) :
x+2(-1)+2(-1)+0=+1 or x=+5
`THEREFORE` Valence SHELL config. = `3d^(0)` (i.e., no unpaired ELECTRON)
Ox state of Fe in (b) : x+0+0+0=+2
or x = + 2
`therefore` Valence shell config. = `3d^(6)` (i.e., 4 unpaired electrons)
Ox. state of Co in (c ) : x+2(-2)+2(-1)=-2
or x=+4
`therefore` Valence shell config. `=3d^(5)` (i.e., 5 unpaired electrons)
Ox state of Tiin (d) : x+6(0)=+3 or x=+3
`therefore` Valence shell config. = `3d^(1)` (i.e., 1 unpaired electron)
THUS, complex of cobalt has MAXIMUM unpaired electrons (viz. 5) and hence has highest paramagnetism.
Discussion
5278.

What are the reagents required to prepare phenolphthalein?

Answer»

PHENOL +Phthalic ACID
Phenol+ BenzenePhenol + ANILINE

Solution :Phenol+ Phthalic anhydride
Discussion
5279.

Whatare theusesof aliphaticnitrocompound.

Answer»

SOLUTION :(i) Nitgromethane isusedas AFUEL forcars.
(II)CHLOROPICRIN `(CCI_(3)NO_(2))` is usedas aninsecticidle
(III)Nitroethane is usedas a fueladditive andprecurserto expolosiveandtheyare goodsolventsfor polymers.celluloseestersyntheticrubber anddyesetc.
Discussion
5280.

Write the structures of different dihalogen derivatives of propane.

Answer»

SOLUTION :(i) `CH_3-CH_2-CHBr_2`(II) `CH_3-CBr_2-CH_3` (III)`BrCH_2-CHBr-CH_3` (IV)`BrCH_2-CH_2-CH_2Br`
Discussion
5281.

Write the structure of the major organic product in each of the following reaction : CH_(3)CH(Br)CH_(2)CH_(3) + NaOH overset("water") to

Answer»

SOLUTION :Reactions giving the structure of MAIN ORGANIC product, are as under :
`underset("2-Bromobutane") (CH_(3) - underset(Br) underset(|)CH - ) CH_(2)CH_(3)+ NAOH underset(("Hydrolysis")) overset("Water") to CH_(3) - underset("Butane -2-ol") underset(OH) underset(|)CH - CH_(2)CH_(3) + NaBr + H_(2) O `
Discussion
5282.

The unitof rateconstant for firstorder reaction is

Answer»

`MIN""^(-2)`
`s`
`s^(-1)`
`min`

ANSWER :C
Discussion
5283.

Which oxide of nitrogen is the most stable:

Answer»

`2NO_2(G) ⇌ N_2(g) + 2O_2(g)
K = 6.7 xx 10 ^(16) MOL litre^(-1)`
`2NO(g) ⇌ N_2(g) + O_2(g) ,
K = 2.2 xx 10^(30) mol litre^(-1)
`2N_2O_5(g) ⇌ 2N_2(g) + 5O_2(g) ,
K = 3.5 xx 10 ^(33) mol^(-5) litre^(-5)`
`2 N_2O(g) ⇌ 2N_2(g) + O_2(g) , K = 3.5 xx 10^(33) mol litre^(-1)`

ANSWER :A
Discussion
5284.

Which one of the following pairs is mismatched ?

Answer»

FOSSIL FUEL burning release of `CO_(2)`
Nuclear power radioactive wastes
Solar ENERGY Greenhouse effect
Biomass burning release of `CO_(2)`

Solution :Solar energy is not responsible for green house effect instead it is a source of energy for the PLANTS and animals
Discussion
5285.

Write the equation for the preparation of phosphine.

Answer»

SOLUTION :`Ca_3P_2 + 6HCL RARR 3CaCl_2 + 2PH_3`
or, 2lP + 3H_2SO_4rarr Al_2(SO_4)_3 + 2PH_3`
Discussion
5286.

Which of the followingcurve gives the variation ofLambda_(m) "with" sqrtC " for "CH_(3)COOH ?

Answer»




NONE of these

ANSWER :D
Discussion
5287.

The thermochemical equation for the dissociation of hydrogen gas into atoms may be written as:H_2 to 2H, Delta H =436 kJWhat is the ratio of the energy yield on combustion of hydrogen atoms to steam to the yield on combustion of an equal mass of hydrogen molecule to steam? Heat of formation of H_2O(g) is- 241.81 kJ "mole"^(-1)

Answer»


ANSWER :2.8
Discussion
5288.

Which of the trivalent ions is colourless?

Answer»

`Gd^(3+)`
`PM^(3+)`
`TM^(3+)`
`Er^(3+)`

SOLUTION :`Gd^(3+)` has `f^(7)` configuration
Discussion
5289.

What are antibodies ? How do they function ?

Answer»

Solution :ANTIBODIES are these MICRO organs who fight against antigens in our BODY.
They are DRUG target.
Discussion
5290.

The SI unit of cell potential is ……………….. .

Answer»

AMPERE
OHM
VOLT
`Ohm^(-1)`

ANSWER :C
Discussion
5291.

Which set has different class of compounds?

Answer»

Tranquillizers : equanil, HEROIN, valium
Antiseptics : bithional, dettol, BORIC acid
Analgesics : naproxen, morphine, ASPIRIN
BACTERICIDAL:penicillin, AMINOGLYCOSIDES,ofloxacin

Answer :A
Discussion
5292.

While separating a mixture of ortho-and para - nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.

Answer»

SOLUTION :o-NITROPHENOL is steam - volatile due to INTRAMOLECULAR H - bonding and hence can be separated by steam distillation. P- nitrophenol is not steam volatile because of INTERMOLECULAR H - bonding.
Discussion
5293.

What are the applications of adsorption in chemicaal analysis ?

Answer»

SOLUTION :(i) In TLC (ii) As ADSORPTION INDICATORS (III) In separation of inert gases
Discussion
5294.

What type of hybridisation is associated with N in NH_3 ? What is the expected bond angle in NH_3 ?

Answer»

Solution :`sp^(3), 109.5^(@)`. But actual ANGLE is ` 107^(@)` .
Discussion
5295.

When bleaching powder is treated with insufficient quantity of dil. H_(2)SO_(4)the products form are

Answer»

`CaCl_(2) + CaSO_(4) + HOCL`
`CaCl_(2) + CaSO_(4) + HCL`
`CaCl_(2) + CaSO_(4)`
`CaSO_(4) + HCl`

Answer :A
Discussion
5296.

What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaOH

Answer»

`CH_(3)Cl`
`C_(2)H_(5)Cl`
`"CC"l_(3)CHO`
`CHCl_(3)`

SOLUTION :When chlorine reacts with ethyl alcohol in the presence of NaOH, chloroform is obtained as a final product.
`CH_(3)CH_(2)OH + Cl_(2) overset("Oxidation")to underset("ACETALDEHYDE")(CH_(3)CHO)+2HCl`
`CH_(3)CHO+3Cl_(2) overset("Chlorination") to underset("Chloral")("CC"l_(3)CHO)+3HCL`
`"CC"l_(3)CHO + NaOH overset("Hydrolysis")to underset("Chloroform")(CHCl_(3))+ HCOONa`
Discussion
5297.

Write the equations for the preparation of 1-iodobutane from (i) 1-butanol (ii) 1-chlorobutane (iii) but-1-ene.

Answer»

Solution :(i) `underset("1-Butanol")(CH_(3)CH_(2)CH_(2)CH_(2)OH) OVERSET(P+I_(2))to underset("1-Iodobutane")(CH_(3)CH_(2)CH_(2)CH_(2)I)`
(ii) `underset("1-Chlorobutane")(CH_(3)CH_(2)CH_(2)CH_(2)CL) underset(("Finkelstein REACTION"))overset("KI?acetone, "DELTA)to underset("1-Iodobutane")(CH_(3)CH_(2)CH_(2)CH_(2)I)`
(iii) `underset("But-1-ene")(CH_(3)CH_(2)CH=CH_(2)) underset("Anti-Mark. addn.")overset("HBr, PEROXIDE")to underset("1-Bromobutane")(CH_(3)CH_(2)CH_(2)CH_(2)Br) underset(("Finkelstein reaction"))overset("KI/acetone, "Delta)to underset("1-Iodobutane")(CH_(3)CH_(2)CH_(2)CH_(2)I)`
Discussion
5298.

Which one of the following is used as catalyst in Friedel Crafts reaction?

Answer»

ANHYDROUS `ZnCl_2`
Anhydrous `CuCl_2`
Anhydrous `AICI_3`
Androus `CaCl_2`

SOLUTION :Anhydrous `AICI_3`
Discussion
5299.

Which of the following is used to produce and sustain powerful superconducting magnets to form an essential part of NMR spectrometer?

Answer»

Ar
Ne
Rn
He

Answer :D
Discussion
5300.

Which of the given polymer is condensation polymer as well as Homopolymer?

Answer»

Nylon-6,6
Nylon-6
Dacron
Glyptal

SOLUTION :`Na_(2)B_(4)O_(7)+ZnSO_(4)overset(Delta)rarr UNDERSET("BEAD")underset("COLOURLES")(ZN(BO_(2))_(2))+2NaBO_(2)+SO_(3)uarr`
Discussion