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10251.

Write the statements of the products (A), (B), (C ), (D), and (E) in the following scheme.

Answer»

Solution :
NOTE: For reaction `C` to `D`: Replacement of halogen in haloarenes takes place under drastic conditions. Moreover, `EWG`, such as `(-NO_(2)), (-COOH)` group at `o-` and `p-` position (but not m-postion) w.r.t. halogens GREATLY ACTIVATES the halogens towards nucleophilic displacement, i.e., `ArSN` (aromatic SUBSTITUTION nucleophilic) reaction activated by `EWG` at `o-` and `p-`position.
Discussion
10252.

Whay is the product obtained when glycine hydrochloride reacts with two equivalents of NaOH ? Write the chemical reactions involved.

Answer»


SOLUTION :`Cl^(THETA)H_(3)overset(OPLUS)(N)-UNDERSET(underset(underset("glycinehydrochloride")(O))(||))(CH_(2))-C-OH + underset("1st eqv.")(NaOH) rarr overset(oplus)(N)H_(2)CH_(2) overset(overset(O)(||))(C)O^(Theta)+H_(2)+NaCl`
`overset(oplus)(NH_(3))CH_(3) underset(underset(O)(||))(C)-O^(Theta)+ underset("2nd eqv.")(NaOH) rarr H_(2)N-CH_(2)-overset(overset(O)(||))(C)-O^(Theta) Na^(oplus)+H_(2)O`.
Discussion
10253.

Which of the following complex has lowest molar conductivity ?

Answer»

`[Co(NH_(3))_(6)][Cr(NO_(2))_(6)]`
`[Cr(NH_(3))_(5)(NO)_(2)][Co(NH_(3))(NO_(2))_(5)]`
`[Cr(NH_(3))_(4)(NO_(2))_(2)][Co(NH_(3))_(2)(NO_(2))_(4)]`
`[Co(NH_(3))_(5)(NO_(2))][Cr(NH_(3))(NO_(2))_(5)]`

Solution :(c ) `[Cr(NH_(3))_(4)(NO_(2))_(2)]^(+)`
`[Co(NH_(3))_(2)(NO_(2))_(4)]^(-)`
has the LOWEST ionic charge.
Discussion
10254.

Which of the following is a monohasic non protic acid ?

Answer»

`H_(3)PO_(2)`
`HNO_(3)`
`H_(3)BO_(3)`
`H_(3)PO_(3)`

Solution :`H_(3)BO_(3) + H_(2)O hArr [B (OH)_(4)]^(-) + H^(+)`
Discussion
10255.

Which of the following is an example of a globular protein

Answer»

KERATIN
INSULIN
Collagan
MYOGLOBIN

ANSWER :D
Discussion
10256.

The sum of coordination number and oxidation number of the metal Min the complex [M(en)_(2)(C_(2)O_(4))]Cl (where en is ethylenediamine) is :

Answer»

7
8
9
6

Solution :`[M(en)_(2)(C_(2)O_(4))]^(+)`. If OXIDATION no. of Mis X, then `x+0+(-2)=+1orx=+3`
As en and `C_(2)O_(4)` are bidentate ligands, coordination no.=6
`therefore` SUM of oxidation no. and coordination no. = 3+6=9
Discussion
10257.

Which vitamin is not obtained from plants

Answer»

Thiamine
CYANOCOBALAMINE
Pyriodoxine
a- Tocopherol

Solution :Cyanocobalamine is chemical NAME of vitamine `B_(12)` and the main source of vitamin `B_(12)` is liver, cheese milk , EGG, fish, meat ,etc.
Discussion
10258.

Which of the following does not exist?XeOF_4,NeF_2,XeF_2,XeF_6.

Answer»

`XeOF_4`
`NeF_2`
`XeF_2`
`XeF_6`

ANSWER :B
Discussion
10259.

White phosphorus is very reactive, but not the red one. Why?

Answer»

Solution :White phosphorus is very reactive, DUE to the P-P-P bond angle strain at 60° Red phosphorus is very STABLE, due to chain like polymeric structure. P.1,6 Maximum covalency of nitrogen is four. Explain. Solution Nitrogen has no valence d-orbitals. Excitation of 2s electron to 3s orbital is difficult. Hence nitrogen does not form five bonds. `N(Z = 7): [He] 2s^(2)2p^(1)2p^(1)2p^(1)`
Nitrogen can form three covalent bonds and one dative bond as in `NH_(4)^(+)` or in `C_(6)H_(5)NH^(+)` ions.
Its maximum covalency is four.
Discussion
10260.

Which diagram is correctly related to the extraction of Zn from Calamine?

Answer»

CALAMINE` overset("Roasting")rarr`
Roasted ore `overset("Heating with calamine")rarr ZN`
Calamine`overset ("Roasting") underset("with air")rarr `
Roasted ore `overset("CARBON")underset("reduction")rarr Zn`
Calamine `overset("CALCINATION")rarr`
Calcinated ore `overset ("Reduction by HG")rarr Zn`
Calamine `overset("Calcination") rarr`
Calcinated ore`overset("Reduction by carbon") rarr Zn`

Answer :4
Discussion
10261.

Which one of the following solution will have highest conductivity .

Answer»

`0.1 M CH_(3) COOH`
`0.1 M NaCl`
`0.1 M KNO_(3)`
`0.1 M HCl`

Solution :NaCl, `KNO_(3) , HCl` are strong ELECTROLYTES but the SIZE of `H^(+)` is smallest . Smaller size of the ions , greater is the CONDUCTANCE and hence greateris the conductivity ( k = `G XX` cell const.)
Discussion
10262.

The value of Delta H and Delta S for five different reaction are given below. |{:("Reaction",Delta H(kJ mol^(-)),Delta S(JK^(-)mol^(-))),(I,+98.0,+14.8),(II,+55.5,+14.8),(III,+28.3,-84.8),(IV,-40.5,+24.6),(V,+34.7,"0.0"):}| On the basis of these values, predict which one of these will be spontaneous at all temperature?

Answer»

Reaction I
Reaction II
Reaction III
Reaction IV

Solution :A SPONTANEOUS PROCESS is accompanied by decrease in enthalpy and increase in ENTROPY means `DeltaH` is NEGATIVE and `DeltaS` is positive.
Discussion
10263.

Why are defects created in crystals ?

Answer»

Solution :Defects in crystals are PRODUCED when the process of CRYSTALLISATION OCCURS at FAST or moderate rates.
Discussion
10264.

Which of the folloiwng is ammouium anionic detergent

Answer»

n-hexadecyI trimethyI AMMONIUM bromide
stearyI trimethyI ammonium choride
pentaerylthirtyI stearate
sodium lauryI sulphate

Answer :D
Discussion
10265.

Writethe majorclasses in which the carbohydratesare divided depending upon wheter theeundergohydrolysis and if so , the numberof producetsformed .

Answer»

Solution :On the basisof HYDROLYSIS, carbohydratesare divided into three majorclasses.
(i) Monosaccharides. Thesecannotbe hydrolysedintosimplermolecules. Theseare furthercalssifiedas aldose , and KETOSE .
(ii)Oligosaccharide. Thesecarbohydrateson hydrolysis give2-10 unitsof MONO - saccharides .
Forexample:Sucrose .
(iii) Polysaccharides . Theseare highmolecular mass carbohydrateswhich givemanymolecules of monosaccharides on hydrolysis . Form example: Cellulose ,strach .
Discussion
10266.

When inversion of sucrose is studied at pH=5, the half-life period is always found to be 500 minutes irrespective of any initial concentration but when it is studied at pH=6, the half-life period is found to be 50 minutes. Derive the rate law expression for the inversion of sucrose.

Answer»

Solution :At `pH=5,` as half-life period is FOUND to be independent of initial concentration of sucrose, this means with RESPECT to sucrose, it is a reaction of first order, i.e., Rate = k [Sucrose].
If n is the order with respect to `H^(+)` ION, `t_(1//2)PROP[H^(+)]^(1-n),`
`{:(i.e.",",,,500prop(10^(-5))^(1-n),,,[pH=5" means "[H^(+)]=10^(-5)M]""...(i)),("and",,,50prop(10^(-6))^(1-n),,,[pH=6" means "[H^(+)]=10^(-6)M]""...(ii)):}`
DIVIDING (i) by (ii), `10=(10)^(1-n)"i.e. "1-n=1" or "n=0," i.e., order with respect to "H^(+)" ion = 0. Hence, overall rate law is Rate = k [Sucrose] "[H^(+)]^(0).`
Discussion
10267.

The time of decay for thermonuclear reaction is given by t=5xxt_(1//2). The relation between mean life T and time of decay t is given by

Answer»

`2 T ln 2`
`5 T ln 2`
`2 T ln 2`
`(1)/(T)ln2`

SOLUTION :`t=5xxt_(1//2)=5xx(ln2)/(lambda)`
`=5Tln2`
Discussion
10268.

Which of the following gives yellow oily liquid when treated with nitrous acid ?

Answer»

`CH_(3)NH_(2)`
`CH_(3)CH_(2)NH_(2)`
`(CH_(3))_(2)NH`
`C_(6)H_(5)NH_(2)`.

Answer :C
Discussion
10269.

Which of the following is N,N-dimethylaniline?

Answer»




Solution :TWO alkyl (methyl) groups BONDED to NITROGEN
Discussion
10270.

What is the colour of potassium dichromate in acidic medium ?

Answer»

SOLUTION :ORANGE red/orange.
Discussion
10271.

The relationshipbetween K_(p) and K_(c )is K_(p) = K_(c ) (RT) Delta n. What would be the value of Deltan for the reaction NH_(4) Cl (s) hArr NH_(3) (g)+ HCl(g) ?

Answer»

1
0.5
1.5
2

Solution :`DELTAN=` NUMBER of MOLES of GASEOUS - number of moles of gaseous REACTANTS
`=2-0=2`
Discussion
10272.

Which of the following compound gives carbylamine when heated with chloroform and alcoholic potash :

Answer»

Aldehyde
Primary amine
SECONDARY amine
PHENOL

ANSWER :B
Discussion
10273.

What happens when H_2S reacts with SO_2 ?

Answer»

SOLUTION :`SO_2`behaves as an OXIDISING agent and OXIDISES `H_2S` to S.
`2H_2S + SO_2 RARR 2H_2O + 3S darr`
Discussion
10274.

Which one of the following statements is incorrect regarding stereochemistry of most of the amino acids ?

Answer»

Amino acid containing 3 carbon ATOMS is OPTICALLY active
They have L-configuration
They have R-configuration
Glycine is optically inactive

Answer :C
Discussion
10275.

Which compound exhibits maximum dipole moment among the following ?

Answer»




Solution :In CASE of aromatic compounds, dipole moment `prop`ELECTRON TRANSFER or EXTENT of delocallsation of electrons.Since, in case of p-nitroaniline electron transfer is MAXIMUM. Hence, p-nitroaniline is more polar or has maximum dipole moment.
Discussion
10276.

What are vitamins?

Answer»

Solution :Vitamins are small ORGANIC . COMPOUNDS that cannot be SYNTHESISED by our body but are essential for certain function. HENCE, it must be obtained through DIET.
Discussion
10277.

The value of K_(sp) of two sparingly soluble salts Ni(OH)_2 and AgCN are 2.0 times 10^-15 and 6 times 10^-17 respectively. Which salt is more soluble ? Explain.

Answer»

Solution :`AgCN leftrightarrow AG^(+)+ CN^-`
`K_(sp)=[Ag^(+)][CN^(-)]=6 times 10^-17`
`NI(OH)_2leftrightarrowNi^(2+)+2OH^-`
`K_(sp)=[Ni^(2+)][OH^-]^2=2 times10^-15`
Let `[Ag^+]=S_1,then[CN^-]=S_1`
Let `[Ni^(2+)]=S_2, then[OH^-]=2S_2`
`S_1^2=6times10^-17,S_1=7.8 times10^-9`
`(S_2)(2S_2)^2=6times10^-17,S_1=0.58 times10^-4`
`Ni(OH)_2` is more stable than AgCN.
Discussion
10278.

Which of the following sequence of reactions (reagent ) can be used for the conversion of C_6H_5CH_2CH_3 into C_6H_5CH=CH_3

Answer»

`SOCl_2 , H_2O`
`SO_2Cl_2 , alc.KOH`
`Cl_2//hv , H_2O`
`SOCl_2` , alc. KOH

Solution :`SO_2Cl_2` causes free radical SUBSTITUTION at benzylic position and alc. KOH causes elimination
Discussion
10279.

underline(C)lO_(3)+H_(2)O to HClO_(3)+HClO_(4)

Answer»

If PRODUCT is oxy acid with -IC suffix.
If product is oxy acid with -ous suffix
If product are TWO oxy ACIDS one with -ic suffix and otherone with -ous suffix.
If product is not oxy acid, neither with -ic suffix nor with -ous suffix

Answer :a
Discussion
10280.

Which of the following is an allylic alcohol?

Answer»


Both (1) & (2) (`AAK_MCP_36_NEET_CHE_E36_001_A01`)

ANSWER :D
Discussion
10281.

The stable oxidation states of Mo are

Answer»

`+2, +3`
`+2, +7`
 `+3, +7`
`+3, +5`

ANSWER :B
Discussion
10282.

Which of the following compounds donot belong to the lipids

Answer»

Fats
Amino Acids
Phosphlipids
Carbohydrates

Answer :B::D
Discussion
10283.

Which of the following sequence is correct regarding field strength of ligands as per spectrochemical series?

Answer»

`SCN^(-) lt F^(-) lt CN lt CO`
`F^(-) lt SCN^(-) lt CN^(-) lt CO`
`CN^(-) lt F^(-) lt CO^(-) lt SCN^-`
`SCN^(-) lt CO lt F^(-) lt CN^-`

Solution :According to ligand STRENGTH SERIES
Discussion
10284.

VO_(4)^(-),CrO_(4)^(-2) " and " MnO_(4)^(-2) are pale yellow strong yellow and intense purpce respectively in aqueous solution. The darkening colour is due to

Answer»

Charge TRANSFER
d-d transition
Half filled d-dub shells
Half filled d-dub shells

Solution :`VO_(4)^(-), CrO_(4)^(-2)` has Ar configuration and shows COLOUR due to charge transfer
Discussion
10285.

Which of the following can act as Lowry - Bronsted acid as well as a base ?

Answer»

`Cl^(-)`
`HCO_(3)^(-)`
`H_(3)O^(+)`
`SO_(4)^(2-)`

Answer :B
Discussion
10286.

When succinic acid is heated, product formed is

Answer»

Succinic anhydride
ACETIC ACID
`CO_(2)` and methane
Propionic acid

Solution :When succinic acid is heated it FORMS succinic anhydride.
.
Discussion
10287.

van't Hoff factor x, y and z for association, dissociation and no change of solute in the solution respectively are in the order :

Answer»

X lt y lt Z
x GT z gt y
x lt z lt y
x gt y gt z

Solution :For association, `ilt1,` For DISSOCIATION, `igt1.`
For no change, `i=1`. Hence, order is `x lt z lt y`.
Discussion
10288.

Which cannot show tautomerism ?

Answer»




ANSWER :B
Discussion
10289.

Write down the structure of sugar present in DNA.

Answer»

SOLUTION :Dexoyribose.
Discussion
10290.

Which one of the following is aromatic

Answer»

Cyclopentadienyl cation
Cyclooctatetraene
CYCLOHEPTATRIENE
Cycloheptatrienyl cation

Solution :To be aromatic
(i)MOLECULE should have `(4n+2)pi` ELECTRONS in conjugation
(II)Molecular should be PLANAR Cycloheptatriene `(4n+2)pi` electrons but not in conjugation
Discussion
10291.

Which one is a mixed salt

Answer»

`NaHSO_(4)`
`NaKSO_(4)`
`K_(4)FE(CN)_(6)`
`Mg(OH)Cl`

Solution :It CONTAINS two cations and ONE anion.
Discussion
10292.

Which of the following complex will follow EAN rule ?

Answer»

`[MN(CO)_(5)]`
`[Mn(Co)_(6)]`
`[Fe(Co)_(5)]`
`[Co(Co)_(4)]`

Solution :`[NiBr_(2)(PE t_(3))_(2)]`
`Ni^(+2): sp^(3)` hybridised-tetrahedral structure, paramagnetic
`[Cu(NH_(3))_(4)]SO_(4),`
`Cu^(+)=dsp^(2)`- square PLANNER, paramagnetic
Discussion
10293.

When potassium iodide is added to silver nitrate solution. The sol formed may be written as :

Answer»

`AGLI^(-)`
`AglAg ^(+)`
`AgINO _(3)`
`NO_(3)AgI AG ^(+)`

Answer :B
Discussion
10294.

Which of the following can act as lowery- Bronsted acid well as base?

Answer»

`HCL`
`SO_4^(2-)`
`HPO_4^(2-)`
`Br^-`

Solution :`HPO_4^(2-)` can have the ability of accept to PROTON to FORM `H_2PO_4^-`.
It can also have the abilityto DONATE a proton to form `PO_4^(-3)`
Discussion
10295.

Which of the followingis an example of branchedchain polymer ?

Answer»

PVC
POLYESTER
Low DENSITY polthene
Nylon-66

Solution :Low density POLYTHENE is an exampleof branchedchain POLYMER .
Discussion
10296.

Which of the following reactions does not go to completion to give the stated product

Answer»




SOLUTION :Reaction CONDITIONS of these OPTIONS are not CORRECT SUFFICIENT
Discussion
10297.

Which of the following arrangements does not represent the correct order of the property stated against it ?

Answer»

`Sc ltTi lt CR lt Mn :` NUMBER of oxidation states
`V^(2+) ltCr^(2+) lt Mn^(2+) lt Fe^(2+) :` paramagnetic behaviour
`Ni^(2+) lt Co^(2+) lt Fe^(2+) lt Mn^(2+):` ionic size
`Co^(3+) lt Fe^(3+) lt Cr^(3+) lt Sc^(3+) :` STABILITY in aqueous solution.

Solution :(a) Number of oxidation states INCREASES along a period.Hence, (a) is correct.
(b) `V=3d^(3) 4s^(2) , V^(2+) = 3d^(3)= 3` unpaired `e^(-)`
`Cr= 3d^(5) 4s^(1) , Cr^(2+)= 3d^(4) = 4` unpaired `e^(-)`
`Mn= 3d^(5)4s^(2), Mn^(2+)= 3d^(2+)= 5` unpaired `e^(-)`
`Fe=3d^(6) 4s^(2), Fe^(2+)= 3d^(6) = 4` unpaired`e^(-)`
Hence, correct ORDEROF paramagnetic behaviour will be `V^(2+) lt Cr^(2+) = Fe^(2) lt Mn^(2+)`. Thus, `(b)` is incorrect.(c ) Ionic radii `(M^(2+))` increase along the period . Hence, (c ) is correct.
(d) Stability of `M^(3+)` ion is aqueoussoltuion increasesas `E_(M^(3+) //M^(2+))^(@)`values decrease. Hence, (d) is correct
Discussion
10298.

Which one of the following is used as an anti-freezer in automobile radiator?

Answer»

GLYCEROL
PHENOL
BENZYL alcohol
ETHYLENE GLYCOL

Solution :Ethylene glycol
Discussion
10299.

Which of the following molecules is (are) chiral ?

Answer»

I and II
III and IV
II, IV and VI
I, II, III and VI

Solution :Compound do not have plane & centre of symmetry are known as optically active compounds.
Discussion
10300.

Two liquids A and B form an ideal solution.The solution has a vapour pressure of 7000 torr at 80^@C.It is distilled til 2//3^(rd) of the solution is collected as contensate. The composition of the condensate is x'_A=0.75 and that of the residue is x''_A=0.30.If the vapour pressure of the residue at 80^@C is 600 Torr, which of the following is/are true ?

Answer»

The COMPOSITION of the original liquid was `x_A=0.6`
The composition of the original liquid was `x_A=0.4`
`P_A^C=2500/3` Torr
`P_B^C=500` Torr

Solution :`X_AP_A^@+X_BP_B^@=700`..(i)
`X_A''P_A^@+X_B''P_B^@=0.30P_A^@+0.70 P_B^@=600`..(ii)
if moles of A & B initially are x & y then
`x=0.75xx2/3(x+y)+0.30xx1/3(x+y)`..(III)
& `x_A=x/(x+y)` or `x_B=y/(x+y)`..(IV)
Solving gives
`X_A=0.6, " " , X_B=0.4, " " P_A^@=2500/3 "torr" & " " P_B^@=500` torr
Discussion