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2151.

Which of the following artificial sweeteners is methyl ester of a dipeptide ?

Answer»

Aspartame
Sucralose
Saccharine
Alitame

Answer :D
Discussion
2152.

The stable oxiation state of Cu, Ag and Au are respectively

Answer»

`CU^(+), AG^(+), Au^(+)`
`Cu^(2+), Ag^(+), Au^(2+)`
`Cu^(+), Ag^(+), Au^(3+)`
`Cu^(2+), Ag^(+), Au^(3+)`

ANSWER :C
Discussion
2153.

Which of the following set of properties belongs to PCl_5

Answer»

`sp^(3)`, tetrahedral , 4 VALENCE shell pairs of ELECTRONS
`sp^(3)d`, trigonal bipyramidal , 5 valence shell pairs of electrons
`sp^(3)d^(2)`, octahedral , 6 valence shell pairs of electrons
`sp^(3)d` , SQUARE planar , 4 valence shellpairs of ELECTRON

Solution :Valence shell electronic configuration of

Since there is no lone pair of electorns on P atoms, `PCl_(5)` has the expected trigonal bipyramidal shape.
Discussion
2154.

Which of the Grignard reagent will use to prepare 3-methyl 2-butanol ?

Answer»

2-butanon + METHYL magnesium bromide
Acetone + Ethyl magnesium bromide
ACETALDEHYDE + PROPYL magnesium bromide
Ethyl propionate bromide + Methyl magnesium

Solution :Acetaldehyde + Propyl magnesium bromide
Discussion
2155.

Which halogen has the gretest electron affinity?

Answer»

SOLUTION :CHLORINE.
Discussion
2156.

Thevapourpressureof waterat 20^(@)C is 17 mm Hg Calculatethe vapourpressureof asolutioncontaining2.8 g of urea (NH_(2)CONH_(2)) in50 g of water .

Answer»


Solution :Vapourpressureof a solvent (water) `=P_(o) =17 mm Hg`
MASS of solvent`= W_(1)= 50 g`
mass ofurea =`W_(2)= 2.8 g`
Molarmass ofwater `= M_(1) =18` g mol
Molar mass of urea `(H_(2)NCONH_(2)) 60 g mol^(-1)`
Vapourpressureof asolution=P= ?
ByRaoult 'slaw
`(P_(o) - P)/(P_(o)) = ( W_(2)xx M_(1))/(W_(1) xx M_(2)) `
`(17- P)/(17) = (2.8 xx 18)/(50 xx 60)= 0.0168`
`:. 17- P =0.0168 xx 17 =0. 2856`
`:. P = 17 - 0.2856 = 16.714 mm Hg`
Discussion
2157.

Write the reactions given below (a) Al(NO_(3))_(3) is heated (b) Al_(2)O_(3) is heated with carbon in presence of dry Cla_(2)(c) Sn is treated with hot and conc. HNO_(3)(d) Sn is treated with alkali (e) PbO is treated with NaOH (0 PbO is treated with NaCl (g) Fe is treated with (Cold, dilute), (hot, concentrated), concentrated HNO_(3), (sp.gr > 1.12) (h) Ferrous oxalate is heated (i) Ferrous sulphate is ignited 0. (j) Cuprous oxide is treated with ferric sulphate. "

Answer»

SOLUTION :(a) ` 4Al(NO_(3))_(3) rarr 2AlCl_(3) + CO`
(b) `Al_(2)O_(3) + C + Cl_(2) rarr AlCl_(3) + CO`
(c) `5Sn + 20HNO_(3) rarr H_(2)Sn_(5)O_(11).4H_(2)O + 20NO_(2) + 5H_(2)O`
(d) ` Sn + 2NaOH + H_(2)O rarr Na_(2)SO_(4) + 2H_(2) `
(e ) `PbO + 2NaOH rarr Na_(2)PbO_(2) + H_(2)O `
(f) `2PbO + NaCl rarr Pb_(2)O_(3) + NaCl`
(g) ` 4Fe + 10HNO_(3) rarr 4Fe(NO_(3))_(2) + NH_(4)NO_(3) + 3H_(2)O `
` 4Fe + 10HNO_(3) rarr 4Fe(NO_(3))_(2) + N_(2)O + 5H_(2)O `
`Fe + 4HNO_(3)rarr Fe(NO_(3))_(2) + NO + 2H_(2)O`
(h) `FeC_(2)O_(4) rarr FeO + CO + CO_(2)`
(i) ` 2FeSO_(4) rarr Fe_(2)O_(3) + SO_(2) + S)_(3) `
` Cu_(2)O + Fe(SO_(4))_(3) + H_(2)SO_(4) rarr 2CuSO_(4) + 2FeSO_(4) + H_(2)O`
Discussion
2158.

Which of the following will give yellow precipitate with l_(2)//NaOH?

Answer»

`lCH_(2)COCH_(2)CH_(3)`
`CH_(2)COOCOCH_(3)`
`CH_(3)CONH_(2)`
`CH_(3)CH(OH)CH_(2)CH_(3)`

Answer :A::D
Discussion
2159.

The standard potential of an electrode is its potential when the concentration of the salt solution is

Answer»

1N at 298 K
1 M at 298 K
1 M at 273 K
1 N at 125 K

Answer :B
Discussion
2160.

Using IUPAC norms, write the systematic names of the following: [Co(en)_(3)]^(3+)

Answer»

SOLUTION :TRIS(ethane-1, 2-diamine)COBALT(III) ION
Discussion
2161.

The standard electrode potential (E^(@)) for OC l^(-)//Cl^(-) and Cl^(-)//(1)/(2)Cl_(2) respectively are 0.94V and -1.36V. The E^(@) value for OC l^(-)//(1)/(2)Cl_(2) will be:-

Answer»

`-0.42V`
`-2.20V`
`0.52V`
`1.04V`

SOLUTION :`OC l^(-)toCl^(-),E^(o)=0.94V`
`Cl^(-)to(1)/(2)Cl_(2)+e^(-)E^(o)=-1.36V`
adding the TWO equations, we get
`OC l^(-)to(1)/(2)Cl_(2),E^(o)=0.94-1.36=-0.42V`.
Discussion
2162.

Write the reaction of Williamson's synthesis of 2-ethoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol

Answer»

SOLUTION :
Discussion
2163.

When one mole of each of the following complex salts is treated with excess of AgNO_(3) which of them gives maximum amount of AgCl?

Answer»

`[Co(NH_(3))_(6)]Cl_(3)`
`[Co(NH_(3))_(5)Cl]Cl_(2)`
`[Co(NH(_3))_(4)Cl]Cl`
`Na_(2)[PtCl_(6)]`

Solution :When `[Co(NH_(3))_(6)]Cl_(3)` is treated with excess of `AgNO_(3)` then 3 moles of AgCl are OBTAINED, as THEREARE 3 ionisable in the complex (present outside the coordination sphere). Compounds (b) and (c)have two and one ionisable `Cl^(-)` ions RESPECTIVELY, whereas d has none.
Discussion
2164.

Three moles of PCl_(5). three moles of PCl_(3) and two moles of Cl_(2) are taken in a closed vessel. IF at equlibrium the vessel has 1.5 moles of PCl_(5), the number of moles of PCl_(3) present in it is

Answer»

6
`4.5`
5
3

Solution :`PCl_(5(G))hArrPCl_(3(g))+Cl_(2(g))`
`{:("3",3,2,("Initially")),("(3-x)",(3+x),(2+x),("Aqulibrium")):}`
Given that, `(3-x)=1.5, thereforex=1.5,` THEREFORE no. of moles of `PCl_((g))Presentis =3+1.5=4.5`
Discussion
2165.

What will be the of Van't Hoff factor for benzoic acid if it dimerses in solution ? How will the experimental molecular wight vary as comp[ared to the normal molecular wight ?

Answer»

Solution :Since henzonic acid dimerises I benzene solution, the valueof Van't Hoff FACTOR
for benzonic acid will be 0.5. The experimental MOLECULAR WEIGHT will be twice the normal molecular weight for details, consult SECTION 13.
Discussion
2166.

Which of the following is/are not known ? PCl_(3), AsCl_(3), SbCl_(3), NCl_(5), BiCl_(5).

Answer»

SOLUTION :(i) `NCl_(5)` (due to absence of d-orbitals) (ii) `BiCl_(5) (Be^(5+)` being an oxidising AGENT oxidises `Cl^(-)` ION ot `Cl_(2) and Cl^(-)` ion being a reducing agent reduces `Bi^(5+)` to `Bi^(3+)`).
Discussion
2167.

Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?

Answer»

Solution :`Delta_(t)=((4)/(9))Delta_(0)`. THUS, `Delta_(t)` is smaller than `Delta_(0)`.Hence, less ENERGY (higher WAVELENGTH) is absorbed by tetrahedral complexes than by octahedral complexes of the same metal and ligands. THEREFORE, the observed colours are different.
Discussion
2168.

What is the oxidation state of chlorine in hypochlorous acid ?

Answer»

`+1`
`+3`
`+5`
`+7`

ANSWER :A
Discussion
2169.

Write the names of monomers of the following polymers: (i) (ii) (--CH_(2)-CH=CH-CH_(2)-CH_(2)-underset(CN)underset("|")"CH"--)_(n)

Answer»

SOLUTION :(i) Hexamethylenediammine, ADIPIC acid (or their IUPAC names)
(ii) Buta-1, 3-diene, Acrylonitide
Discussion
2170.

Which on mixing with water gives a hissing sound and becomes very hard:

Answer»

SLAKED lime
Quick lime
Limestone
Superphosphate of lime

Answer :B
Discussion
2171.

Which of the following compound is/are a pair of isomers ?

Answer»




SOLUTION :(a)`Ph-undersetunderset(O)(||)C-NH-CH_3` and `Ph-undersetunderset(CH_3)(|)C=N-OH` are STRUCTURAL isomers.
(B)These compounds are identicle
(c )These are CHAIN isomers
Discussion
2172.

Zinc oxide is :

Answer»

A BASIC oxide
An ACIDIC oxide
A NEUTRAL oxide
An AMPHOTERIC oxide

ANSWER :D
Discussion
2173.

What is the number of unpaired electrons in tetrahedral [Ni(CO)_(4)] complex ?

Answer»

2
4
0
8

Solution :`NI(CO)_(4)`
It is DIAMAGNETIC and TETRAHEDRAL
Discussion
2174.

What is standard reduction potential E^(@)?

Answer»

SOLUTION :The standard REDUCTION potential `(E^(@))` is a MEASURE of the oxidising TENDENCY of the species.
Discussion
2175.

The valency of sulphur in SO_(4)^(2-) is :

Answer»

2
1
4
6

Solution :
`X-8=-2 rArr x-6=0 rArr x= +6`
a) 2 B)1 c) 4 d) 6
Discussion
2176.

Which of the following is a mixed oxide

Answer»

`Fe_(2)O_(3)`
`PbO_(2)`
`Pb_(3)O_(4)`
`BaO_(2)`

Solution :`Pb_(3)O_(4)` is a mixed oxide. It can be represented as `2PbO-PbO_(2)`.
Discussion
2177.

Which of the following tripositive ion has half filled 4 f subshell ?

Answer»

Gd
Am
Pr
Yb

Answer :A
Discussion
2178.

Whichof the following is leavo rotatory?

Answer»

Fructose
Glucose
sucrose
all of these

Answer :A
Discussion
2179.

Whichof thefollowingpairsare notcorrectlymatched?

Answer»




Solution :Not correctlymatched
` gtC=O OVERSET( N_2 H_5/// overset(Ө) OH)to `wolfkishnerreactiongives` gt ` Group
`(d )-C -= Noverset( SN +HCI)to`partialhydrogenation`-CH=NHoverset(SM +HCI) to- CH_2-NH_2`
Discussion
2180.

What is the atomic arrangement of P atom in orthophosphorous acid ?

Answer»

Tetrahedral
Octahedral
Square planar
None of the above

Answer :D
Discussion
2181.

The succeeding operations that enable this transformation of states are

Answer»

HEATING, COOLING, heating, cooling
Heating, cooling, cooling, heating
Cooling, heating, cooling, heating
Cooling, heating, heating, cooling

Answer :C
Discussion
2182.

Which product is formed by reaction between water and benzene diazo cloride salt ?

Answer»

DIPHENYL ether
Sodium phenoxide
No reaction
Phenol

Solution :
Discussion
2183.

Which of the following is an example of fibrous proteins?

Answer»

COLLAGEN in BONE
MYOSIN in muscles
Fibroin in silk
all of these

Answer :D
Discussion
2184.

When CEO_3^-, changes toCI^-

Answer»

It GAINS SIX electrons
It gains FOUR electrons
It LOSES six electrons
It gains THREE electrons

Answer :A
Discussion
2185.

Which of the following dimensio of a unit cell represent a cubic unit

Answer»

`a = b = C , alpha = beta =gamma = 90^(@)`
`a = b = c , alpha = beta = 90^(@) ne gamma`
`a = b NEC , alpha = gamma = 90^(@)`
`a ne b ne c , alpha ne beta ne gamma`

Solution :For SCC, a = b = c and`alpha = beta = gamma = 90^(@)`
Discussion
2186.

Vapour pressure of solution containing 6g of a non-volatile solute in 180 g of water is 20.0 torr.If 1 mole water is further added vapour pressure increases by 0.02 torr Which of the following is true ?

Answer»

The MOLECULAR weight of solute is `54 g "mol"^(-1)`
The vapour pressure of pure water is 20.22 TORR
Addition of more water in the solution will further raise the vapour pressure of solution
The vapour pressure of pure water is 22.22 torr

Solution :`(P-20)/20=6/Mxx18/180=6/Mxx1/10`...(1)
`(P-20.02)/20.02=6/Mxx18/198=6/Mxx1/11`...(2)
from (1) & (2) calculation gives `M=54` gm/mole
P=20.22 torr
& on dilution `DELTAP` DECREASES (lowering) so vapour pressure of solution increases.
Discussion
2187.

Which oxide is of different type then other ?

Answer»

`Na_2 O_2`
`PbO_2`
`TiO_2`
`MnO_2`

ANSWER :A
Discussion
2188.

What will be the initial rate of reaction if its rate constant is 10^(-3)s^(-1) and the concentration of the reactant is 0.2 mol L^(-1)? What fraction of the reactant will be converted into the products in 200 seconds ?

Answer»

SOLUTION :INITIAL rate `=K xx [A]`
Substituting the values, we get
Initial rate `=10^(-3)s^(-1) xx 0.2 "mol L"^(-1)=2xx10^(-4)"mol L"^(-1)s^(-1)`.
To obtain fraction of reactants that will be CONVERTED into products after 200 s, proceed as follows:
`t=(2.303)/(k)"log"(1)/(N)`
or `"log"(1)/(N)=(200sxx10^(-3)s^(-1))/(2.303) =(2xx10^(-1))/(2.303)=0.086`
or `(1)/(N)="Antilog of"0.086=1.219`
or `N=(1)/(1.219)=0.820 or 82%`
Per cent that will change into products `=100-82=18%`.
Discussion
2189.

Which of the following ions or compounds in a solution tend to produce an acidic ,a base or a neutral solution ? (a)C_(2)H_(5)O^(-),(b)Cu^(2-) (c ) SO_(3)^(2-) (d) F^(-) (e) NH_(4)^(+) CH_(3)COOHNa (g) KNO_(3) (h) NaOCl (i) Na_(2)CO_(3),(j) ZnCl_(2)

Answer»

Solution :(a) `C_(2)H_(5)O^(-)+H_(2)OrArr C_(2)H_(5)OH+OH^(-)("BASIC solution")`
`(b) Cu^(+2)+2H_(2)OhArr Cu(OH)_(2)downarrow +2H^(+)("Acidic solution")`
`(c) SO_(3)^(2-)+H_(2)OhArr HSO_(3)^(-)+OH^(-)("Basic solution")`
`(d) F^(-)+H_(2)OhArr HF+OH^(-)("Basic solution")`
(E)`NH_(4)^(-)+H_(2)OhArr NH_(4)OH+H^(+)("Acidic solution")`
`(f)CH_(3)COONa+H_(2)OhArr CH_(3)COOH+Na^(+)+OH^(-).("Basic Solution")`
`(G) KNO_(3)+H_(2)OhArr K^(+)+NO_(3)^(-)+H_(2)O.("NEUTRAL solution")`
`(h)NaOCl+H_(2)OhArr HOCl+Na^(+)+OH^(-).("Basic solution")`
`(i) Na_(2)CO_(3)+H_(2)OhArr HCO_(3)^(-)+2Na^(+)+OH^(-).("Basic solution")`
(j) `ZnCl_(2)+2H_(2)OhArr Zn(OH)_(2)downarrow+2Cl^(-)+2H^(+).("Acidic solution")`
Discussion
2190.

Which of the following can be included in the category of colloids -

Answer»

Milk
Blood
Latex
All

Answer :D
Discussion
2191.

Which mode of expressing concentration is independent of temperature :

Answer»

MOLARITY
Molality
Formality
Normality

Answer :B
Discussion
2192.

Anti Markonikov's rule only applicable for addition of:

Answer»

`Br_2`
`H_2S`
HF
HBr

Answer :D
Discussion
2193.

What is responsible from the following for innertransition elemtns having +3 stable oxidation state?

Answer»

IONISATION energy
Hydration ENTHALPY
(A) and (B) both
Electronic structure

Answer :C
Discussion
2194.

Which of the following is TRUE about secondary valence ?

Answer»

It is denoted by SOLID lines.
It corresponds to the OXIDATION STATE of the central metal.
It is non-directional and non-rigid
It can be satisfied by negative ions or neutral MOLECULES or both.

Answer :D
Discussion
2195.

Two alkyl halides A and B with molecular formula C_(7)H_(15)Cl have different boiling points. These are optically active in nature. On reacting with Mg dissolved in anhydrous ether and then with water, each compound gives 2,4-dimethylpentane. Suggest structures for these compounds.

Answer»

Solution :
the STRUCTURE of the hydrocarbons is:
The possible structures of the TWO isomeric haloalkanes [A] and [B] are:

These on reacting with Mg metal dissolved in anhydrous ether, form grignard reagetns which on reaction with WATER give hydrocarbon 2,4-dimethylpentane.
Discussion
2196.

Which of the following ions is most stable in aqueous solution ?

Answer»

`AG^+`
`CU^(2+)`
`Fe^(2+)`
`Na^+`

ANSWER :D
Discussion
2197.

To get n-type semiconductor, impurity to be added to silicon should have the following number of valence electrons

Answer»

2
3
1
5

Answer :D
Discussion
2198.

Which of the following substances cannot be used for the replacement of OH group in organic compounds by Cl:

Answer»

`S_2Cl_2`
SO`Cl_2`
`PCl_3`
`PCl_5`

ANSWER :A
Discussion
2199.

underset(MeOH) overset(H_(2)SO_(4))to Q (single) Q is

Answer»




SOLUTION :
Discussion
2200.

When butene-1 is mixed with HBr , the major reaction product is:

Answer»

1,2-dibromobutane
1-bromobutane
2-bromobutane
None of these

Answer :B
Discussion