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13451.

Two cyclic hemiacetal forms of glucose given below are called as

Answer»

Enantiomers
Optical antipodes
Anomers
Tautomers

Answer :C
Discussion
13452.

The systematic name of : CH_(3)-CHBr-CH_(2)OH is

Answer»

3-Hydroxy-2-bromopropane
1-Hydroxy-2-bromopropane
2-Bromo-1-propanol
3-Hydroxy ISOPROPYL BROMIDE.

ANSWER :C
Discussion
13453.

Which of the following is strongest Lewis Base

Answer»

`H_(2)O`
`CH_(3)OH`
`CH_(3)OCH_(3)`
`C_(6)H_(5)OH`

Answer :C
Discussion
13454.

When aqueous KCN is added to a solution of CuSO_(4), a whitie precipitate solube in RCN is formed. But no precipate to formed when H_(2)S gas is bubbled through this solution. Explain.

Answer»

Solution :The white PRECIPATE FORMED dissolves in EXCESS of KCN to form a soluble complex. LTRBGT `CuSO_(4) + 2KCN to underset("white ppt")Cu(CN)_(2) + K_(2)SO_(4)`
`Cu(CN)_(2) + 2KCN to underset("Soluble complex")(K_(2)[Cu(CN)_(4)])`
This complex is quite stable and `H_(2)S` gas is not in a position to break this. That is why, no precipitate is formed.
Discussion
13455.

The value of magnetic moment is zero in the case of antiferromagnetic substances because the domains

Answer»

GET oriented in the direction of the applied magnetic field. 
get oriented opposite to the direction of the applied magnetic field.
are oppositely oriented with respect to each other without the application of magnetic field.
cancel out each other's magnetic moment. 

Solution :In ANTIFERROMAGNETIC SUBSTANCES the magnetic moment is zero as the DOMAINS are exactly opposite to each other in absence of magnetic field Ex. : MnO .
Discussion
13456.

Two beakers are placed side by side in a sealed encloser. The first beaker contains 100mL of pure water, the other an equal volume of an aqueous solution of sugar. What would be the volumes of the liquids in the two beakers when all physical changes stop, that is when the equilibrium is reached ?

Answer»

Solution :The vapour PRESSURE over water is higher than that over the sugar solution. The vapour pressure necessary to ACHIEVE equilibrium with pure water `(p_(1))` is higher than that required with the sugar solution `(p_(2))`.

Consequently , as the pure water SOLVENT in the first beaker seeks to reach equilibrium by forming water vapour, the sugar solution in the other beaker seeks to reach equilibrium by removing water molecules from the vapour phase. A net MOVEMENT of water molecules from the pure water in the first beaker, to the sugar solution in the second beaker, results. The process continues until no free water in the first beaker REMAINS. The other beaker shall then have 200mL of sugar solution.
Discussion
13457.

Which of the following carbonyls will have the strongest C-O bond ?

Answer»

`Mn(CO)_(6)^(+)`
`Cr(CO)_(6)`
`V(CO)_(6)^(-)`
`Fe(CO)_(5)`

Solution :As+ vechargeon the CENTRAL metal atom increase, the LESS readily the metal can donate ELECTRON density into the `pi^(**)` orbitals of CO ligand to weaken the C-O bond. Hence, the C-O bond WOULD be STRONGEST in `Mn(CO)_(6)^(+)`.
Discussion
13458.

The rupturing of a plant or animal cell due to flow of water into it is called ………………. .

Answer»

SOLUTION :HEMOLYSIS
Discussion
13459.

The reagent (X) in the given reaction is phenol underset(273K)overset('X')toParabromophenol.

Answer»

`Br_2//CH_3 COOH`
`Br_2 //FeBr_3`
BROMINE WATER
`Br_2//CS_2`

SOLUTION :`Br_2//CS_2`
Discussion
13460.

The totalnumberof electrons aroundthe nitrogenatominamines are,

Answer»

8
7
4
3

Answer :A
Discussion
13461.

Which of the following element never form compound in ground state :-

Answer»

N
B
C
P

SOLUTION :Boron atom cannot FORM COMPOUND in ground state
Discussion
13462.

Which of the following halogen can replace others?

Answer»

`I_2`
`Br_2`
`F_2`
`Cl_2`

ANSWER :C
Discussion
13463.

Which of the following conditions is not true for a solution of ethyl alcohol and cyclohexane ?

Answer»

The ENTHALPY of mixing is positive
The HEATING will decrease the solubility of the solution
There will be increase in volume on mixing
The solution SHOWS positive DEVIATION from ideality.

Answer :B
Discussion
13464.

whichof the followingorganiccompoundsare formedbywurtzreaction ?

Answer»

ALCOHOLS
Hydrocarbons
Haloalkanes
HALOARENES

ANSWER :B
Discussion
13465.

Which of these in not among the reaction products when a crossed aldol addition occurs between ethanol and butanal ?

Answer»

`CH_(3)oversetoverset(OH)(|)CHCH_(2)oversetoverset(H)(|)C=O`
`CH_(3)CH_(2)CH_(2)oversetoverset(OH)(|)CHundersetunderset(CH_(3))(|)CHCH_(2)oversetoverset(H)(|)C=O`
`CH_(3)oversetoverset(OH)(|)CHundersetunderset(CH_(2)CH_(3))(|)(CHCH)oversetoverset(H)(|)C=O`
`CH_(3)CH_(2)CH_(2)oversetoverset(OH)(|)CHCH_(2)CH_(2)oversetoverset(H)(|)C=O`

Answer :B
Discussion
13466.

Which of the following is not an essential

Answer»

Glycine
Lysine
Phcnylalanine
Valine

Answer :A
Discussion
13467.

Volumetric titrations involving KMnO_(4), are carried out only in presence of dilute H_(2)SO_(4) but not in the presence of HCI or HNO_(3) This is because oxygen produced from KMnO_(4) + dil: H_(2)SO_(4), is used only for oxidizing the reducing agent. Moreover, H2SO4 does not give any oxygen of its own to oxidize the reducing agent. In case HCI is used, the oxygen produced from KMnO_(4) + HCI is partly used up to oxidize HCI and in case HNO_(3) is used, it itself acts as oxidizing agent and partly oxidizes the reducing agent. KMnO_(4), in various mediums gives following productsMn^(7+)overset(H^(+))toMn^(2+)Mn^(7+)overset(H_(2)O)toMn^(4+)Mn^(7+)underset(OH^(-))toMn^(6+)QThe number of moles of KMnO_(4)that will be needed to react with one mole of sulphite in an acidic solution is

Answer»

`(2)/(5)`
`(3)/(5)`
`(4)/(5)`
1

Answer :A
Discussion
13468.

Which statement is true for cyclohexane

Answer»

It has two possible isomers
It has THREE conformations
BOAT conformation is most stable
Chair and boat conformation differ in ENERGY by 30 kj/mol

Solution :Chair and boat form differ in energy by 30 kJ/mol.
Discussion
13469.

Volumetric titrations involving KMnO_(4), are carried out only in presence of dilute H_(2)SO_(4) but not in the presence of HCI or HNO_(3) This is because oxygen produced from KMnO_(4) + dil: H_(2)SO_(4), is used only for oxidizing the reducing agent. Moreover, H2SO4 does not give any oxygen of its own to oxidize the reducing agent. In case HCI is used, the oxygen produced from KMnO_(4) + HCI is partly used up to oxidize HCI and in case HNO_(3) is used, it itself acts as oxidizing agent and partly oxidizes the reducing agent. KMnO_(4), in various mediums gives following productsMn^(7+)overset(H^(+))toMn^(2+)Mn^(7+)overset(H_(2)O)toMn^(4+)Mn^(7+)underset(OH^(-))toMn^(6+)QMnO_(4)^(2-)(1 mole) in neutral medium disproportionates to,

Answer»

`(2)/(3)`mole of `MnO_(4)^(-)`, and (1)/(3)`mole of `MnO_(2)`
 `(1)/(2)`mole of `MnO_(4)^(-)` and (2)/(3)`mole of `MnO_(2)`
`(1)/(3)` mole of `Mn_(2)O_(7)` and mole of `MnO_(2)`
 `(2)/(3)`mole of `Mn_(2)O_(7)`, and`(1)/(3)` mole of `MnO_(2)`

Answer :A
Discussion
13470.

What is peptization ? Give an example.

Answer»

Solution :Peptization is defined as the process of CONVERTING a freshly prepared precipitate into COLLOIDAL SOL by shakingit with dispersion medium in the presence of a SMALL amount of electrolyte.
Example : Freshly precipitate silver iodide is converted into colloidal solution of silver iodide with smallamount of silver nitrate or potassium iodide solution.
Discussion
13471.

Volumetric titrations involving KMnO_(4), are carried out only in presence of dilute H_(2)SO_(4) but not in the presence of HCI or HNO_(3) This is because oxygen produced from KMnO_(4) + dil: H_(2)SO_(4), is used only for oxidizing the reducing agent. Moreover, H2SO4 does not give any oxygen of its own to oxidize the reducing agent. In case HCI is used, the oxygen produced from KMnO_(4) + HCI is partly used up to oxidize HCI and in case HNO_(3) is used, it itself acts as oxidizing agent and partly oxidizes the reducing agent. KMnO_(4), in various mediums gives following productsMn^(7+)overset(H^(+))toMn^(2+)Mn^(7+)overset(H_(2)O)toMn^(4+)Mn^(7+)underset(OH^(-))toMn^(6+)QNumber of electrons transferred in each case when KMnO_(4) acts as an oxidizing agent to give MnO_(2), Mn^(++) Mn(OH)_(3), and MnO_(4)^(2-)are respectively

Answer»

3, 5, 4, 1
4, 3, 1,5
1, 3, 4, 5
 5, 4, 3, 1

Answer :A
Discussion
13472.

Which of the following is a kinetic property of sols?

Answer»

Electrophoresis
Brownian MOVEMENT
TYNDAL EFFECT
Peptisation

Answer :B
Discussion
13473.

Which one of the following polymers will NOT catch fire ?

Answer»

`(--CF_(2)-CF_(2)--)_(n)`
`(--CH_(2)-CH_(2)--)_(n)`
`(--underset(CN)underset(|)CH-CH_(2)--)_(n)`
`(--CH_(2)-underset(CL)underset(|)CH--)_(n)`

ANSWER :A
Discussion
13474.

Which one of the following is a nature colloid?

Answer»

Sodium chloide solution
Cane SUGAR solution
UREA solution
BLOOD

Solution :Blood is a NATURAL colloid.
Discussion
13475.

Volumetric titrations involving KMnO_(4), are carried out only in presence of dilute H_(2)SO_(4) but not in the presence of HCI or HNO_(3) This is because oxygen produced from KMnO_(4) + dil: H_(2)SO_(4), is used only for oxidizing the reducing agent. Moreover, H2SO4 does not give any oxygen of its own to oxidize the reducing agent. In case HCI is used, the oxygen produced from KMnO_(4) + HCI is partly used up to oxidize HCI and in case HNO_(3) is used, it itself acts as oxidizing agent and partly oxidizes the reducing agent. KMnO_(4), in various mediums gives following productsMn^(7+)overset(H^(+))toMn^(2+)Mn^(7+)overset(H_(2)O)toMn^(4+)Mn^(7+)underset(OH^(-))toMn^(6+)QThe equivalent weight of KMnO_(4), in the given reaction isKMnO_(4)toK_(2)MnO_(4)+ MnO_(2) + O_(2)

Answer»

`(M)/(6)`
`(M)/(2)`
M
`(M)/(3)`

ANSWER :B
Discussion
13476.

Which one of the following sets of compounds correctly illustrates the law of reciprocal proportions ?

Answer»

`P_(2)O_(3),PH_(3),H_(2)O`
`P_(2)O_(5),PH_(3),H_(2)O`
`N_(2)O_(5),NH_(3),H_(2)O`
`N_(2)O,NH_(3),H_(2)O`

Solution :
SIMILARLY, CHECK for other cases.
Discussion
13477.

Which of the following reactions give alkylation product :

Answer»




SOLUTION :
Discussion
13478.

Which one of the following statement is always true about the spontaneous cell reaction in a galvanic cell?

Answer»

`E_(cell) gt 0, DeltaG^(@) gt 0, Q gt K_(c)`
`E_(cell)^(@) lt 0, DeltaG^(@) lt 0, Q lt K_(c)`
`E_(cell)^(@) gt 0, DeltaG^(@) lt 0, Q lt K`
`E_(cell)^(@) gt 0, DeltaG^(@) lt 0, Q gt K_(c)`.

SOLUTION :For spontaneous cell REACTION, `E_(cell)^(@)=+ve," i.e., "gt0,DeltaG^(@)=-ve, " i.e., "lt0 and Q lt K_(c)`
(ALSO, remember that `-DeltaG^(@)=RT" ln "K.` -ve `DeltaG` implies that ln K will be +ve, i.e., Kgt1)
Discussion
13479.

Which of the following reaction is true at 25^(@)C for given cell ? Cell : Pt|Br_(2(l))|Br_((aq))^(-)||Cl_((aq))^(-)|Cl_(2(aq))|Pt

Answer»

`2Br_((aq))^(-)+Cl_(2(g)) to 2Cl_((aq))^(-)+Br_(2(L))`
`Br_(2(l))+2Cl_((aq))^(-) to Cl_(2(g))+2Br_((aq))^(-)`
`Br_(2(l))+Cl_(2(g)) to 2Br_((aq))^(-)+2Cl_((aq))^(-)`
`2Br_((aq))^(-)+Cl_(2(g)) to 2Cl_((aq))^(-)+Br_(2(l))`

Solution :Note : above given REACTION is actually used in LABORATORY for identification of `Br^(-)`, so following representation can be POSSIBLE:
`Cl_((aq))^(-)|Cl_(2)|Pt||Pt|Br_(2(l))|Br_((aq))^(-)`
Discussion
13480.

Which of the following has chirality centre ? (a) sec . Butyl chloride(b) Ethanethiol (c ) 2- methylbutane(d) 3-bromohexane (e ) 3- aminobut -2- ene.

Answer»

Solution :The carbons MARKED in compounds (a) and (d) are chiral carbons .
(a) sec. BUTYL CHLORIDE
`CH_(3) - underset(Cl) underset(|)overset(***)CH - CH_(2) - CH_(3)`
(d) 3- bromohexane
`CH_(3) - CH_(2) - underset(Br) underset(|) overset(***) CH - CH_(2) - CH_(2)- CH_(3) `
Discussion
13481.

Which pair of electrolytes cannot be distinguished by the products of electrolysis using inert electrodes?

Answer»

1 M `CuSO_(4)` SOLUTION, 1 M `CuCl_(2)` solution
1 M KC1 solution, 1 M KI solution
1 M `AgNO_(3)` solution, 1 M Cu`(NO_(3) )_( 2)` solution
1 M KC1 solution, 1 M NaCl solution

Answer :D
Discussion
13482.

Which statements are correct?

Answer»

A gas with greater critical temperature gets more adsorbed 
The type of adsorption can be determined from the adsorption ISOBARS 
CHEMISORPTION if reversible in nature 
Variation of extent of adsorption with temperature TELLS about the type of adsorption

Solution :`T_c prop`adsorption
Type of adsorption is determined by adsorption Isobars
Discussion
13483.

What happen when sulphurdioxide reacts with sodium hydroxide and sodium hydroxide and sodium carbonate?

Answer»

Solution :Sulphur dioxide reacts with SODIUM hydroxide and sodium carbonate to form sodium bisulphite and sodium sulphite respectively.
(i) `SO_(2)+NaOHrarr underset("(Sodium bisulphite)")(NaHSO_(3))`
(ii) `2SO_(2)+Na_(2)CO_(3)+H_(2)Orarr 2NaHSO_(3)+CO_(2)`
`2NaHSO_(3)RARR underset("(Sodium sulphite)")(Na_(2)SO_(3)+H_(2)O+SO_(2))`
Discussion
13484.

Which of the following give(s) the strength of the acid or base?

Answer»

pH
Normality
DEGREE of dissociation
Dissociation constant

Answer :C::D
Discussion
13485.

The temperature coefficient of a reaction is 2, by what factor the rate of reaction increases when temperature is increased from 30^(@)C to 80^(@)C ?

Answer»

`16`
`32`
`64`
`128`

ANSWER :B
Discussion
13486.

What is the value of change in internal energy at 1 at, in the process H_(2)O (l, 323 K) rarr H_(2)O (g, 473 K) Given : C_(p) (H_(2)O, l)=75.3 JK^(-1) mol^(-1) , C_(p) (H_(2)O, g)=33.314 JK^(-1) mol^(-1), DeltaH_(vap) at 373 K=40.7 kJ//mol

Answer»

`109.1 kJ//mol`
`37.6 KJ//mol`
`43.86 KJ//mol`
`48.36 KJ//mol`

Solution :`H_(2)O (L, 323 K) rarr H_(2)O (G, 473 K)`
`H_(2)O (l, 323 K) overset(Delta_(r) U_(1))(rarr) H_(2)O (l, 373) overset(Delta_(r)U_(2))(rarr) underset(("for solid and liquid "C_(P)~~C_(V))(H_(2)O (g, 373) overset(Delta_(r)U_(3))(rarr) H_(2)O (g, 473))`
and `""Delta_(r)U=Delta_(r)U_(1)+Delta_(r)U_(2)+Delta_(r)U_(3)`
`=C_(V, m)DeltaT+(Delta_(r)H_(2)-Deltan_(g)RT)+C_(V, m)DeltaT`
`=(75.3xx50)/1000+(40.7-(1xx8.314xx398)/1000)+((33.314-8.314)xx100)/1000`
`Delta_(r)U ~~43.86" kJ/mol"`
Discussion
13487.

The totalnumberofmonohalogenatedproducts formed byhalogenation of 2,4-4 trimethylhexane is :

Answer»

8
7
6
5

Answer :C
Discussion
13488.

Which of the following statements is/are not correct

Answer»

`O Cl_(2) gt SF_(2) gt OF_(2)` , bond angle
`N(SiH_(3))_(2) gt N(CH_(3))_(3)` (Lewis basic character)
BACK BONDING causes the DECREASES in bond length always
`(CH_(3))_(3)SiOH gt (CH_(3))_(3) CO H `, acidic character

Answer :A
Discussion
13489.

Which of the following graphs is correct for a zero order of reaction?

Answer»




ANSWER :A::D
Discussion
13490.

Which of the following compounds is not formed in iodoform reaction of acetone?

Answer»

`CH_(3)COCH_(2)I`
`ICH_(2)COCH_(2)I`
`CH_(3)COCHI_(2)`
`CH_(3)COCI_(3)`

Solution :Iodoform reaction of acetone occurs in following steps.
(i) `CH_(3)-OVERSET(O)overset(||)C-CH_(3)+NaOI to CH_(3)-overset(O)overset(||)C-CH_(2)I+NaOH`
(ii) `CH_(3)-overset(O)overset(||)C-CH_(2)I+NaOI to CH_(3)-overset(O)overset(||)C-CHI_(2)+NaOH`
(iii) `CH_(3)-overset(O)overset(||)C-CHI_(2)+NaOI to CH_(3)-overset(O)overset(||)C-CI_(3)+NaOH`
(iv) `CH_(3)-overset(O)overset(||)C-CI_(3)+NaOH to CH_(3)COONa+CHI_(3)`
So COMPOUND which is not formed in iodoform reaction of acetone is `ICH_(2)COCH_(2)I`.
Discussion
13491.

Write the names and draw the structures of each of the following complex compounds : (i) [Co(NH_(3))_(4)(H_(2)O)_(2)]Cl_(3) (ii) [Pt(NH_(3))_(4)][NiCl_(4)]

Answer»

SOLUTION :
Discussion
13492.

Which of the following reaction occurs at the cathode during the charging oflead storage battery?

Answer»

`PB ^(2) +2 e^(-) to Pb`
`Pb^(2+) SO_(4)^(2-)to PbSO_(4)`
`PB to Pb ^(2+) +2c^(-)`
`PbSO_(4)+ 2H_(2)O to 2P bO_(2)to 2PbO_(2) +4H^(+) +SO_(4)^(2-) +2e ^(-)`

ANSWER :D
Discussion
13493.

Which of the following compound will undergo recevisation when solution of KOH hydrolyses? (i)

Answer»

I and iv
ii and iv
iii and iv
iv

Answer :D
Discussion
13494.

Which of the following is/are true about silicones.

Answer»

Silicones CONTAIN repeated `R_(2)SiO` UNITS
`RSiCl_(3)` gives a complex cross linked silicones
`(CH_(3))_(2) SiCl_(2)`gives a chain silicones
When silicone undergo combustion, it form SOLID white powder as ONE of the products.

Solution :Conbustion of silicone produce solid silica.
Discussion
13495.

Which is the general oxidation state shown by actinoids ?

Answer»

SOLUTION :The GENERAL OXIDATION STATE shown by actinoids `+3`.
Discussion
13496.

What is indicated by negative sign before the term of reaction rate?

Answer»

The kinetic ENERGY of the REACTION DECREASES with time.
The energy barrier of reaction decreases with time.
The energy of activation of reaction decreases with time.
The concentration of reactants decreases with time.

Answer :D
Discussion
13497.

Which of the following expressions is applicable to the hydrolysis equilibrium? CN^(-) + H_2 OhArrHCN +OH^(-)

Answer»

`K_h = (k_(w))/(K_a)`
`H=( sqrt(k_h)/(C ))`
`pH =1/2 pK_a [HCN]`
`[H^+] = sqrt((k_w XX K_a)/(C ))`

Solution :`K_h = (k_(w))/(K_a)`
`h=( sqrt(k_h)/(C ))`
`[H^+] = sqrt((k_w xx K_a)/(C ))`
Discussion
13498.

Which of the following drug is used in anxiety

Answer»

Dimetapp
Hisuamine
Iproniazid
cimetidine

Answer :C
Discussion
13499.

Why are sulphide ores converted to oxide form before reduction to metal?

Answer»

SOLUTION :(i) Sulphide ores thermodynamically are more stable than `CS_(2)` and hence cannot be converted by using COKE as reducing agent.
(ii) Moreover `CO_(2)` is more volatile and thermodynamically more stable than `CS_(2)`.
(iii) Thus `DeltaG^(@)` of a metal sulphided is not compensated by the energy of REACTION of metal sulphide with coke.
(iv) Hence, it is better to convert the sulphide ORE to OXIDE form and then subject to smelting (i.e) carbon reduction method.
Discussion
13500.

The suspension milk of lime is composed of:

Answer»

`CA(OH)_(2)`
`CAO`
`CaCl_2`
`CaSO_4`

ANSWER :A
Discussion