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19701.

Which is more stable among alpha-D- glucose and beta-D- glucose? Why?

Answer»

SOLUTION :`beta -D-` GLUCOSE is more stable. In `alpha-D` glucose -OH group at C-1 is in AXIAL position while in `beta`-D- glucose, -OH group at C-1 is equatorial.
Group at other CARBON atoms of `alpha-D-` glucose and `beta-D-` glucose in equatorial position.
Discussion
19702.

Which process is used for thepurification of Al metal ?

Answer»

HOOP's process
Bayer's process
Serpeak's process
Hall's process.

Answer :A
Discussion
19703.

Which of the following is stearyI trimethyl ammonium bromide

Answer»

`[CH_(3) - (CH_(2))_(15)-UNDERSET(CH_(3))underset(|)OVERSET(CH_(3))overset(|)(N)-CH_(3)]^(+) Br^(-)`
`[CH_(3)-(CH_(2))_(17)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)N-CH_(3)]^(+)Br^(-)`
`[C_(12)CH_(25)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)N-CH_(3)]^(+)Br^(-)`
`[CH_(3)-(CH_(2))_(10)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)N-CH_(3)]^(+)Br^(-)`

ANSWER :B
Discussion
19704.

Write the structure of the nucleophilic substitution products in each of the following

Answer»

SOLUTION :
(II) `PhS-CH2-CH=C(CH3)2`
Discussion
19705.

How can you get wrought iron from cast iron ?

Answer»

Solution :Main purpose is to LOWER the carbon content. So, cast IRON is HEATED in reverberatory FURNACE lined with `Fe_2O_3.Fe_2O_3` supplies OXYGEN and C,S,Mn,P get oxidised.
Discussion
19706.

Which one is the correct representation of peptide bond

Answer»

`H-overset(O)overset(||)underset(|)(C)-underset(|)(N)-`
`-overset(O)overset(||)(C)-underset(H)underset(|)(N)-`
`H-overset(OH)overset(|)underset(|)(C)-underset(|)(N)-`
none of these

Solution :Peptides are COMPOUND formed by the condensation of two or more same or DIFFERENT `ALPHA`-amino acid. The condensation occurs between amino acids with the ELIMINATION of water. In this case, the carboxyl group of one amino acid and amino group of another amino acid gets condensed with the elimination of water MOLECULE. The resulting `-overset(O)overset(||)(C)-underset(H)underset(|)(N)-` linkage is called peptide linkage or peptide bond
Discussion
19707.

Which of the following set of species are paramagnetic?

Answer»

<P>`ClO_(2),O_(3),NO_(2)`
`ClO_(2),O_(2),NO_(2)`
`O_(3),O_(2),P_(4)`
`N_(2),B_(2),C_(2)`

ANSWER :B
Discussion
19708.

Trimethyl ethyl (A) ammonium iodide is allowed to react with silver hydroxide and the product formed is heated strongly at about 400 K. The final products are

Answer»

`CH_(2)=CH_(2)` and `(CH_(3))_(2)CHCN`
`CH_(3)CH_(2)CN` and `C_(2)H_(5)NH_(2)`
`CH_(2)=CH_(2)` and `(CH_(3))_(3)N`
`(CH_(3))_(2)C=CH_(2)` and `NH_(3)`.

Answer :C
Discussion
19709.

Which of the following is/are inner orbital complexes as well as paramagnetic with magnetic moment equal to 3.78 (approximate)?

Answer»

`[Co(OX)_(3)]^(3_)`
`[CR(NH_(3))_(6)]^(3+)`
`[Fe(H_(2)O)_(5)NO]^(2+)`
`[ZN(NH_(3))_(6)]^(2+)`

Solution :(b) `d^(3)` PARAMAGNETIC
(c ) `[overset(+1)Fe(H_(2)O)_(5)overset(+1)NO]^(2+) d^(7)(3 u.p.e^(-))`
Discussion
19710.

The thermal decomposition of a compound is of first order.If a sample of the compound decomposes 50% in 120 minutes,in what time will it undergo 90% decomposition….

Answer»

NEARLY 240 minutes
nearly 480 minutes
nearly 450 minutes
nearly 400 minutes

Answer :D
Discussion
19711.

Which of the following does not show tyndal effect ?

Answer»

`CuSO_(4(AQ))`
Mist
Milk
Gum

Answer :A
Discussion
19712.

Which one of the following is used as an urinary antiseptic?

Answer»

UROTROPINE
Urea formaldehyde
Formalin
Aldimin

SOLUTION :Urotropine
Discussion
19713.

Which of the following statement about boron halides isWRONG ?

Answer»

They form tetrahedral molecules
They react with ethers to form addition compounds
They all HYDROLYSE in water
They are all strong Lewis acids

Solution :
In boron trihalides the boron atom is two electron short of the inert gas CONFIGURATION , Hence, they can accept a pair of ELECTRONS and are, therefore, Lewis acids. They hydrolyse in water forming `H_3BO_3` and `HX(BX_3 + 3H_2O to H_3BO_3 + 3HX)` . They form addition compounds with ethers one of the lone pairs of electrons on the O atom in the ether is donated to the electron deficient B atom is B x 3 . In boron trihalides, the central B atom is `sp^2` HYBRIDIZED and therefore the molecules are planar (and not tetrahedral )
Discussion
19714.

Which is used for stopping bleeding?

Answer»

FERRIC chloride
Mohr's salt
Green vitriol
Sodium nitroprusside

Answer :A
Discussion
19715.

When an optically active amine 'A' having molecular formula C_(4)H_(11)N is subjected to Hoffmann's exhaustive methylation followed by hydrolysis, an alkene 'B' is produced which upon ozonolysis and subsequent hydrolysis yields formaldehyde and propanal. The amine 'A' is

Answer»

`CH_(3)-underset(NH_(2))underset("|")"CH"CH_(2)CH_(3)`
`CH_(3)NH-underset(CH_(3))underset("|")"CH"-CH_(3)`
`CH_(3)-underset(CH_(3))underset("|")"NC"H_(2)CH_(3)`
`CH_(3)CH_(2)CH_(2)CH_(2)NH_(2)`

Answer :A
Discussion
19716.

The water vapour pressure at 293 K is 2338.5 Pa, and the vapour pressure of anaqueous solution is 2295.8 Pa. Determine the osmotic pressure of this solution at 313 K if the solution density at this temperature is 1010 kg//m^3. The molecular weight of the solute is 60.

Answer»

SOLUTION :`2.56 XX 10^6 PA`
Discussion
19717.

Which compound does not show mutarotation ?

Answer»

(+) MALTOSE
(-) FRUCTOSE
(+) SUCROSE
lactose

SOLUTION :(+) sucrose
Discussion
19718.

Which of these statements is not true ?

Answer»

`NO^(+)` is not isoelectronic with `O_(2)`
B is always covalent in its compounds
In aqueous SOLUTION, the `TI^(+)` IONS is much more stable than T(III)
`LiAIH_(4)` is a VERSATILE reducing agent in organic synthesis

Answer :A
Discussion
19719.

The standard molar heat of formation of ethane, CO_(2) and water (l) are -21.1, -94.1 and -68.3 kcal, respectively. The standard molar heat of combustion of ethane will be

Answer»

`-373kcal`
`162 kcal`
`-240kcal`
`183.5 kcal`

Solution :`DeltaH_("reaction")=SUM DeltaH` of product `-sum DeltaH` of REACTANTS
`DeltaH_(f)C_(2)H_(6)=-21.1kcal,""DeltaH_(f)""CO_(2)=-94.1kcal`,
`DeltaH_(f)""H_(2)O=68.3kcal`
`C_(2)H_(6)+(7)/(2)O_(2) to 2CO_(2)+3H_(2)O`
`DeltaH_("combustion")=[2DeltaH_(f)CO_(2)+3DeltaH_(f)" "H_(2)O]-[DeltaH_(f)" "C_(2)H_(6)+(7)/(2)DeltaH_(f)O_(2)]`
`=[2xx(-94.1)+3(-68.3)]-[-21.1+(7)/(2)XX(0)]`
`=(-188.2-204.9)+21.1`
`=-393.1+21.1=372kcal`
Discussion
19720.

Ultimate products of hydrolysis of proteins is

Answer»

aniline
ALIPHATIC ACID
AMINO acid
AROMATIC acid

Solution :amino acid
Discussion
19721.

Which of the followng equations is not correctly written

Answer»

`P_(4) + 2 OHNO_(3) rarr 4 H_(3) PO_(4) + 20 NO_2 + 4 H_(2)O`
`C + 4 NHO_3 rarr H_(2) CO_(3) + 4 NO_2 + H_2O`
`I_(2) + 10 HNO_(3) rarr 2HIO_(3) + 10 NO_(2) + 4H_(2)O`
`1/(8) S_(8) + 6 HNO_(3) rarr H_(2) SO_(4) + 6NO_(2) + H_(2)O`

Solution :`C+4HNO_3rarrCO_(2)+2H_(2)O+4NO_2`
Discussion
19722.

Which of the following has greatest reducing power ?

Answer»

HI
HBr
HCI
HF.

Answer :A
Discussion
19723.

Which is correct :-

Answer»

`H_(2)O_(2)` oxidize `Mn^(2+)`
`HOCl` reduce `H_(2)O_(2)` in acidic MEDIUM
Rxn of `KMnO_(4)` with `H_(2)O(2)` in both `(H^(+))` medium `& (OH^(-))` medium give `O_(3)`
All

Answer :C
Discussion
19724.

Which of the following reagent produces 2- methyl propanoic acid with dry ice ?

Answer»

`CH_(3)MGI`
`C_(2)H_(5)MgI`
`(CH_(3))_(2) CHMgI`
`C_(3)H_(7)MgI`

Answer :C
Discussion
19725.

The simple prokaryotic cells evolved when life began on earth. Which of the following nutrients used for evolving more complex eukaryotic cells:

Answer»

`CO_2`
`N_2`
`CO_2` and `N_2`
`O_2`

ANSWER :C
Discussion
19726.

When thiosulphate ion is oxidised by iodine, which one of the following ion is produced?

Answer»

`SO_(3)^(2-)`
`SO_(4)^(2-)`
`SO_(4)^(2-) ("Terathionte")`
`S_(2)O_(6)^(2-)`

SOLUTION :`2Na_(2)S_(2)O_(3)+I_(2)rarr2Nal+Na_(2)S_(4)O_(6)`.
Discussion
19727.

Which shows the highest lattice energy?

Answer»

RbF
CsF
NaF
KF

Answer :B
Discussion
19728.

Which of following is/are steroid hormones?

Answer»

testosterone
progestogen
Estrogen
all of these

Answer :D
Discussion
19729.

Which of the following pairs have nearly the same atomic radii

Answer»

Zr and Hf
Rb and Cs
Pt and Pd
Zn and Cd

Solution :Due to lanthanide CONTRACTION ATOMIC radii of 4D and 5d elements are not SIGNIFICANTLY different.
Discussion
19730.

When no reaction takes place at an electrode then such an electrode having zero potential is called _______electrode .

Answer»

reference
standard
indicator
null

Solution :INACTIVE ELECTRODE.
Discussion
19731.

Values of dissociation constant,K_(a) are given as follows : Acid K_(a) HCN 6.2xx10^(-10) HF "" 6.6xx10^(-4) HNO_(2) "" 7.2xx10^(-4) Correct order of increasing base strength of the base CN^(-), F^(-) and NO_(2)^(-) will be :

Answer»

`F^(-) lt CN^(-) lt NO_(2)^(-)`
`NO_(2)^(-) lt CN^(-) lt F^(-)`
`F^(-) lt NO_(2)^(-) lt CN^(-)`
`NO_(2)^(-) lt F^(-) lt CN^(-)`

Solution :Higher the value of `K_(a)` lower will be the value of `pK_(a)` IE., higher will be the acidic nature. Further since `CN^(-),F^(-) and NO_(2)^(-)` are conjugate BASE of the acids HCN, HF and `HNO_(2)` respectively hence the correct order of base strength will be
`F^(-) lt NO_(2)^(-) lt CN^(-)`
`(because` stronger the ACID weaker will be its conjugate base)
Discussion
19732.

Which factor is important to determine stability of carbocation ?

Answer»

RATE of reaction
TRANSITION STATE
Resonance
Temperature

Answer :C
Discussion
19733.

Which of the following substace is paramag­netic ?

Answer»

`na_(2)o`
`na_(2)o_(2)`
`ko_(2)`
`k_(2)o_(2)`

ANSWER :C
Discussion
19734.

Which of the given compound(s) can act as Lewis acid in both monomer and dimer form?

Answer»

`BH_(3)`
`BeCl_(2)`
`BeH_(3)`
`AlCl_(3)`

Answer :A::B::C::D
Discussion
19735.

Write the dispersed phase and dispersion medium of smoke.

Answer»

Solution :Dispersed phase - CARBON (solid)
Dispersion MEDIUM - AIR (gas).
Discussion
19736.

Two solutions having the same osmotic pressure are called

Answer»

ISOCHORIC SOLUTIONS.
ISOTHERMAL solutions.
ISOTONIC solutions.
ISOBARIC solutions.

Solution :isotonic solutions.
Discussion
19737.

When aqueous ammonia is added to CuSO_4 solution, the solution turns deep blue due to the formation of tetramine copper (II) complex. [Cu(H_2O)_6]^(2+)(aq)+4NH_3(aq) leftrightarrow[Cu(NH_3)_4]^(2+)(aq) among H_2O and NH_3 which is stronger lewis base.

Answer»

Solution :Copper (II) sulphate solution , for example contains the blue hexaaqua copper (II) complex ion. IN the first stage of the reaction, the ammonia acts as a Bronsted-Lowrybase. With a small amount of ammonia solution, hydrogen ions are pulled off two water molecules in the hexaaqua ion.
This PRODUCES a neutral complex, one carrying no charge. If you remove two positively charged hydrogen ions from a 2+ ion, then obviously there isn.t GOING to be any charge left on the ion. Because of the lack of charge, the neutral complex isn.t soluble in water and so you get a pale blue precipitate.
`[CU(H_2O)_6]^(2+)+2NH_3 leftrightarrow [Cu(H_2O)_4OH]+2NH_4^+`
This precipitate is often WRITTEN as `Cu(OH)_2` and called copper (II) hydroxide. The reaction is reversible because ammonia is only a weak base. That precipitate dissolves if you add an EXCESS of ammonia solution, giving a deep blue solution. the ammonia replaces four of the water molecules around the copper to give tetramine diaqua copper (II) ions. The ammonia uses it lone pair to form a coordinate covalent bond with the copper. It is acting as an electron pair donor-a lewis base.
`[Cu(H_2O)_4]^(2+)+4NH_3to[Cu(NH_3)_4(H_2O)_2]^(2+) +H_2O`
Discussion
19738.

Which substance is not used as food preservative ?

Answer»

COMMON salt
Sugar
Sodium benzoate
Sodium ACETATE 

ANSWER :D
Discussion
19739.

There are two isomers with the fomula CH_(3)NO_(2). How will you distinguish between them?

Answer»

SOLUTION :`CH_(3)NO_(2)` has two ISOMERS. They are
(i) `CH_(3)-NO_(2)` (Nitromethane)
(ii) `CH_(2)=underset(O)underset(DARR)(N)OH` (Methyl nitrite)
`to O overset("Tautomerises")(larr)CH_(2)=underset(("Aci-form"))underset(O)underset(darr)(N)-O-H`

Discussion
19740.

Which of the following isomerisms are exhibited by [Cr(NH_(3))_(2)(OH)_(2)Cl_(2)] is

Answer»

Geometrical
Optical
both
Co-ordinational

Solution :`[Ma_(2)b_(2)c_(2)]` type of COMPLEX COMPOUNDS EXHIBIT both optical and geometrical isomerism.
Discussion
19741.

What indicator should be used for the titration of 0.10 M KH_2BO_3 with 0.10 M HCl ? K_a (H_3BO_3)= 7.2 xx 10(-10)

Answer»


Answer :Methyl RED, one with PH =5.22 as MID point of colour CHANGE
Discussion
19742.

Which of the following chemicals can be added for sweetening of food items at cooking temperature and does not provide calories ?

Answer»

Sucrose
Glucose
ASPARTAME
SUCROLOSE

Solution :Sucrolose does not DECOMPOSE while aspartame does at COOKING TEMPERATURE.
Discussion
19743.

Which has the highest heat of vaporisation

Answer»

HF
HCl
HBr
HI

Answer :A
Discussion
19744.

Which forces are responsible for the stability of alpha-helical structure of proteins ?

Answer»


ANSWER :B::D
Discussion
19745.

The root mean square velocity of an ideal gas in a closed container of a fixed volume is increased from 5 xx 10^(4) cm s^(-1) to 10 xx 10^(4) cm s^(-1). Which of the following statements might correctly explain how the change is accomplished ?

Answer»

By HEATING the GAS, the temperature is doubled
By heating the gas, the PRESSURE is quadrupled ( i.e. made four times )
By heating the gas, the volume is tripled.
By heating the gas, the pressure is doubled.

ANSWER :B
Discussion
19746.

Which of the following is the a tranquilizer?

Answer»

Luminal
Seconal
Equanil
All the THREE

ANSWER :D
Discussion
19747.

The vapour pressure of a solution of a non-volatile electrolyte B in a solvent A is 95% of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is 0.3 times, the molecular weight of solute, the weight ratio of the solvent and solute are:

Answer»

<P>

Solution :From RAOULT's LAW
`(P_(0)-P)/(P_(0))=(W_(B)xxM_(A))/(W_(A)xxM_(B))`
or `1/20=(0.3xxW_(B))/(W_(A))`
`:.(W_(A))/(W_(B))=0.3xx20=6.0`
Discussion
19748.

Which is most basic of the following oxides

Answer»

`Al_(2)O_(3)`
`P_2 O_5`
`SiO_2`
`Na_(2)O`

ANSWER :D
Discussion
19749.

Whichhalideof nitrogendoesnot undergo hydrolysis ?

Answer»

SOLUTION :`NF_(3)` ( no d - ORBITAL in eitherN or F).
Discussion
19750.

Which one of the following is the mineral for tin?

Answer»

galena
cerussite
cassiterite
Anglesite

Answer :C
Discussion