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10651.

Which of the following transition metals of 3d series has the lowest melting point ?

Answer»

`Ti(Z= 22)`
`V(Z= 23)`
`Cr(Z= 24)`
`Mn(Z=25)`

Solution :In the first transition series,Mn has abnormally low melting point. This is due to the FACT that Mn has exactlyhalf-filled d-orbitals.As a result, electronic configuration is very stable, i.e., ELECTRONS areheldtightly by the nucleus so that the delocatization is less and the metallic bond ismuch WEAKER than the elements on its either side.
Discussion
10652.

Two reactions A to products and B to products have rate constants K_A and k_B at temperature, T and activation energies E_A and E_B respectively. If k_A lt k_B and assuming that A for both the reaction is same then

Answer»

at lower temperature `k_A` will be greater than `k_B`
at lower temperature `k_A and k_B` will DIFFER more and `k_A GT k_B`
as temperature rises `k_A and k_B`will be close to each other INMAGNITUDE
all

SOLUTION :`k_A=Ae^(-E_a//RT)and k_B=Ae^(-E_a//RT)`
Also `k_A gtk_B and E_A gt E_B`
Now notice that all the given FACTS are satisfied.
Discussion
10653.

Which of thefollowingis notan exampleof disaccharide ?

Answer»

SUCROSE
LACTOSE
Maltoes
CELLULOSE

ANSWER :D
Discussion
10654.

Which of the following gives Friedel Crafts reac- tion?

Answer»




ANSWER :A
Discussion
10655.

Which one is the diseases of skin ?

Answer»

Gonoria
Goiter
SYPHILIS
All of the given

Solution :Syphilis
Discussion
10656.

Which of the following shows electromeric effect ?

Answer»

ALKYL halides
alkyl amines
aldehydes
alkanes.

Answer :C
Discussion
10657.

What is the name of the following reaction ? CH_3CH_2CH_2Br underset("dry acetone")overset(NaI)(rarr)CH_3CH_2CH_2I.

Answer»

Sandmeyer Reaction 
GATTERMAN Reaction 
Finkelstein Reaction
Swarts Reaction 

ANSWER :C
Discussion
10658.

Write the full form of PHBV also write down its preparation and uses.

Answer»

SOLUTION :The full form of PHBV is poly `beta`-hydroxybutyrate - co - `beta`-HYDROXY valerate (PHBV)
It is obtained by the copolymerization of 2-hydroxybutanoic acid and 2-hydroxy- pentanoic acid.
PHBV is USED in speciality packaging, orthopaedic devices and in controlled release of drugs.
PHBV undergoes BACTERIAL degradation in the environment.
Discussion
10659.

When mercuric iodide is added to the aqueous solution of potassium iodide, the

Answer»

FREEZING POINT is RAISED
freezing point does not CHANGE
freezing point is lowered
boiling point does not change

Answer :A
Discussion
10660.

Which of the vitamins given below is water soluble ?

Answer»

VITAMIN C
Vitamin D
Vitamin E
Vitamin K.

Solution :Vitamin C is WATER SOLUBLE.
Discussion
10661.

Which of the following will be obtained on acetylation of aniline

Answer»

Paracetanol
N-acetyl amino benzene
o-amino ACETOPHENONE
p-amino acetophenone

Solution :`C_(6)H_(5)NH_(2)+CICOCH_(3)underset(-HCl)OVERSET("PYRIDINE")rarrunderset("N-acetylaniline")(C_(6)H_(5)NHCOCH_(3)`
Discussion
10662.

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true gt

Answer»

The `DeltaG_(f)^(@)` of the sulphide is greater than those for `CS_(2)` and `H_(2)S`
The `DeltaG_(F)^(@)` is negative for roasting of sulphide ore to oxide.
Roasting of the sulphide to the oxide is thermodynamically feasible.
Carbon and HYDROGEN are suitable reducing agents for METAL sulphides.

Solution :The standard free energies of FORMATION `(DeltaG_(f)^(@))` of most of the sulphides are more negative than those of `CS_(2)` and `H_(2)S`. Hence, neither carbon nor hydrogen can reduce metal sulphides to metal. The standard free energies of formation of OXIDES are much LOWER than those of `SO_(2)` . Therefore , oxidation of metal sulphides to metal oxides is thermodynamically favourable. Hence sulphide ore is roasted to the oxide before reduction.
Discussion
10663.

The stability of arenediazonium ion is due to resonance.

Answer»


ANSWER :T
Discussion
10664.

Whichmetalsare generallyextractedbyelectrolytic processes ? Whichpositionsthesemetalsgenerallyoccupy in theperiodic table?

Answer»

SOLUTION :Electrolyticprocessis USED for the EXTRACTION of activemetalslike Na, Ca, Mg, AL, etc. where all other methodsfail. Except Al andfew other METALS, these metals belongtos -blockelements.
Discussion
10665.

Which of the following reactions is correctly represented

Answer»




ANSWER :A::B
Discussion
10666.

What does products would be formed when a nucleotide from DNA containing thymine is hydrolysed ?

Answer»

SOLUTION :THYMINE, 2-deoxy-D-ribose and PHOSPHORIC ACID are FORMED.
Discussion
10667.

Which of the following is not considered as antacids drug?

Answer»

Omeprazole
Lansoprazole
Cimetidine
PHENACETIN

Solution :Phenacetin is an ANTIPYRETIC DRUG.
Discussion
10668.

Which out of the following statements is false?

Answer»

Avogadro NUMBER `=6.02xx10^(21)`
The relationship between average velocity `(barv)` and ROOT MEAN square velocity (U) is `(barv)=0.912u`.
The mean KINETIC energy of an ideal gas is independent of the pressure of the gas.
The root mean square velocity of the gas can be calculated by the formula `(3RT//M)^(1//2)`.

Solution :Avogadro.s number is `6.02xx10^(23)`
Discussion
10669.

Which will react with acid and bases both (i.e., amphoteric):

Answer»

MgO
CaO
BaO
BeO

Answer :D
Discussion
10670.

What is mean by hydroboration - oxidation reaction ? Illustrate it with an example.

Answer»

Solution :The addition of diborane to alkenes to form trialkylboranes followed by their oxidation with alkaline hydrogen PEROXIDE to form alcohols is called hydroboration - oxidation. This addition reaction follows Anti Markovnikov's rule. For example,
`UNDERSET("Propene")(CH_(3)CH=CH_(2))+underset("Diborane")((BH_(3))_(2))overset("Dry")underset("ether")rarr CH_(3)-underset(H)underset("|")"CH"-underset(BH_(2))underset("|")(CH_(2))overset(CH_(3)CH=CH_(2))rarr (CH_(3)CH_(2)CH_(2))_(2)B-H overset(CH_(3)CH=CH_(2))rarr underset("Tri-n-propylborane")((CH_(3)CH_(2)CH_(2))_(3)B)`
`underset("Tri -n- propylborane")((CH_(3)CH_(2)CH_(2))_(3)B)+3H_(2)O_(2)overset(OH^(-),H_(2)O)rarr underset("Propan-1-ol")(3CH_(3)CH_(2)CH_(2)OH)+underset("Boric ACID")(B(OH)_(3))`
Discussion
10671.

Write downthereactions takingplace in Blastfurnacerelatedtothemetallurgyof ironin thetemperature range 500 - 900 K.

Answer»

SOLUTION :Zoneofreduction'
Discussion
10672.

Which of the following has the shortest N-N bond length ?

Answer»

`[Ru(NH_(3)_(5)N_(2)]^(3+)`
`N_(2)H_(4)`
`N_(2)H_(2)`
`N_(2)`

SOLUTION :`NequivN` has B.O. = 3 (SHORTEST B.L.)
Discussion
10673.

Which one of the following is a polyamide polymer ?

Answer»

Terylene
Nylon-6,6
Buna-S
Bakelite

Solution :
Discussion
10674.

What is a dispersion medium in a colloid ?

Answer»

Solution :In a colloidal, the substance present in larger amount is CALLED DISPERSION MEDIUM
Discussion
10675.

When heated strongly , KMnO_(4) decomposes to form"…..................." and "….................."

Answer»


ANSWER :`K_(2)MnO_(3) , O_(2)`
Discussion
10676.

Which of the following order of reagent is chosen to prepare 1,3-butadiene from C_2H_2

Answer»

`Cu_2Cl_2//NH_4Cl` and `H_2//Pb(BaSO_4)`
`NH_4Cl//CuCl` and `H_2//Pd(BaSO_4)`
`H_2//Pd(BaSO_4)` and `CuCl//NH_4Cl`
`H_2//Pb(BaSO_4)` and `NH_4Cl//CuCl`

ANSWER :A
Discussion
10677.

What are epimers?

Answer»

Solution :SUGAR DIFFERING in CONFIGURATION at an asymmetric centre is KNOWN as EPIMERS.
Discussion
10678.

Which of the following is formed when RNH_(2) reacts with RCHO ?

Answer»

Anils
Acetals
Ketals
Imines

Solution :
Discussion
10679.

The total number of ions produced when one molecule of [Co(NH_3)_6]Cl_3 undergoes ionisation is :

Answer»

1
2
3
4

Answer :D
Discussion
10680.

Which among the following isotope is not found in natural uranium

Answer»

`._(92)U^(234)`
`._(92)U^(235)`
`._(92)U^(238)`
`._(92)U^(239)`

ANSWER :D
Discussion
10681.

The vapour pressure of a solution of a non-volatile electrolyte (A) in solvent (B) is 95% of the vapour pressure of the solvent at the same temperature. If molarmass of B is 30% of molar mass of A, the same ratio of the solvent and solute are

Answer»

0.15
0.2
`4.0`
5.7

Solution :`p_(s)=95%" of "p^(@), i.e., p_(s)=0.95p^(@)`
`M_(B)=30%" of "M_(A), i.e., M_(B)=0.30M_(A)`
(B = solvent, A = electrolyte)
APPLYING COMPLETE formula
`(p^(@)-p_(s))/(p_(s))=(n_(2))/(n_(1))=(w_(2)//M_(2))/(w_(1)//M_(1))=(w_(2))/(w_(1))XX(M_(1))/(M_(2))=(w_(A))/(w_(B))xx(M_(B))/(M_(A))`
`(p^(@)-0.95p^(@))/(0.95p^(@))=(w_(A))/(w_(B))xx0.30 or (0.05)/(0.95)=(w_(A))/(w_(B))xx0.30`
`"or"(w_(B))/(w_(A))=(0.30xx0.95)/(0.05)=5.7`
Discussion
10682.

Which one of the isomeric alkanes (molecular formulaL C_(5)H_(12)) undergo free radial chlorination to yield - (i) only one monochloro derivative.

Answer»

SOLUTION :NEOPENTANE or, 2,2-dimethylpropane. `[(CH_3)_(4)C]`.
Discussion
10683.

Which one of the isomeric alkanes (molecular formulaL C_(5)H_(12)) undergo free radial chlorination to yield - (ii) three isomeric monochloro derivatives

Answer»

SOLUTION :n-pentane `[CH_(3)CH_(2)CH_(2)CH_(3)]`.
Discussion
10684.

Which of the following statements is false in relation to enzyme…

Answer»

PH AFFECTS their functioning
temperature affects their functioning
they always INCREASE activation energy
their reactions are specific

Answer :C
Discussion
10685.

What are the products formed when ammonia reacts with excess chlorine ?

Answer»

`N_(2)andNCl_(3)`
`N_(2)+HCL`
`NCl_(3)+N_(2)`
`N_(2)+NH_(4)Cl`

Answer :D
Discussion
10686.

Thomas slag is

Answer»

`Ca_(3)(PO_(4))_(2)`
`CaSiO_(3)`
MIXTURE of (a) and (b)
`FeSiO_(3)`

ANSWER :C
Discussion
10687.

Which of the following is a high spin complex?

Answer»

`[CO(NH_(3))_(6)]^(3+)`
`[Fe(CN)_(6)]^(4-)`
`[Ni(CN)_(4)]^(2-)`
`[FeF_(6)]^(3-)`

Solution :`[FeF_(6)]^(3-) implies t_(2g)^(1,1,1)EG^(1,1)`
Discussion
10688.

Which reagent can separate nitric oxide from nitrous oxide ?

Answer»

SODIUM nitroprusside SOLUTION
`FeSO_4` solution
Nessler.s reagent
Ammonical silver nitrate solution

Answer :B
Discussion
10689.

Which oxidation state of manganize is unstable ?

Answer»

`+2`
`+4`
`+5`
`+7`

Answer :C
Discussion
10690.

Which of the following has a bond formed by the overlap of sp-sp^(3) hybrid orbitals ?

Answer»

CH3​−C≡C−H
`CH_(3)-CH=CH-CH_(3)`
`CH_(3)=CH-CH=CH_(2)`
`CH-=CH`

ANSWER :A
Discussion
10691.

Which is hydrolysed bywater with greatest ease :

Answer»

`CH_3CONH_2`
`CH_3COOC_2H_5`
`CH_3COCl`
`(CH_3CO)_2O`

ANSWER :C
Discussion
10692.

The weight of silver (eq.wt,=108)displaced by that quanitiy of current which displaced 5600 mL of oxygenat STP is:

Answer»

`54G`
`108G`
`5.4g`
NONE of these

Answer :A
Discussion
10693.

What do you mean by exhaustive methylation of amines?

Answer»

Solution :The process of CONVERTING primary, secondary or tertiary amine into its QUATERNARY ammonium salt by using methyl iodide, is known as EXHAUSTIVE methylation.
`underset((1^@"amine"))(CH_3NH_2) underset(-HI)overset(CH_3 I)to underset((2^@ "amine"))((CH_3)_2)NH underset(-HI) overset(CH_3 I )to underset((3^@ "amine"))((CH_3)_3)N overset(CH_3 I)to underset("Quaternary-ammonium salt")([(CH_3)_4 N]^(+)I^(-))`
Discussion
10694.

Which polymer is used in capsule and orthopaedic devices ?

Answer»

ORLON
PTFE
SBR
PHBV

SOLUTION :PHBV
Discussion
10695.

Unit cell can be broadly classified into 2 categories-primitive and centred unit cells. What is unit cell?

Answer»

Solution :The smallest repeating UNIT of a space LATTICE or CRYSTAL lattice is CALLED unit cell.
Discussion
10696.

Which pair represent halogen acid with longest bond length and the one with highest bond energy respectively ?

Answer»

`CaF_(2)`
`HCL, HF`
`HI,HF`
`HBR,HCl`

Solution :Longest bond length is HI, due to large atomic size of `I_(2)` highest bond energy is HF, due to unlike poles more ATTRACTION SMALL bond length.
Discussion
10697.

Which of the rows in the following arrangements is not according to the property mentioned against it ?

Answer»

B lt C lt O lt N The first ionisation ENTHALPY increases.
`CO_2 ltSiO_2 ltSnO_2 ltPbO_2` The STRENGTH as oxidising AGENT increases.
`NH_3 ltPH_3 ltAsH_3 lt SbH_3` Basic strength increases.
`NH_3 lt PH_3 lt AsH_3 lt SbH_3` Basic strength increases.

Answer :D
Discussion
10698.

Which of the following cannot be made by using Williamson's synthesis?

Answer»

Methoxybenzene
Nenzyl-p-nitrophenyl ETHER
Tert-butyl METHYL ether
Di-tert-butyl ether

Solution :Tert-butyl methyl ether
Discussion
10699.

The substance which is a primary pollutant?

Answer»

`H_(2)SO_(4)`
`CO`
`PAN`
Aldehydes

Solution :CO is a PRIMARY pollutant
Discussion
10700.

Whichof thefollowingsubstance is usedas antiknockcompound ?

Answer»

TEL
LEAD trtrachloride
Lead acetate
`C_(2)H_(5) PbCl`

ANSWER :A
Discussion